Text

License Amendment Request (LAR) 21-01, Chapter 5, 14, OPPD Cpp FC-19-006, Ludlum Model 44-10 Detector Sensitivity CAC2
	ML21271A212
Person / Time
Site:	Fort Calhoun
Issue date:	12/11/2019
From:	Yetter R, Zoller S; Omaha Public Power District
To:	; Office of Nuclear Reactor Regulation
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ML21271A178	List: LIC-20-0013, License Amendment Request (LAR) 21-01, Response Re Revised Post-Shutdown Decommissioning Activities Report, Chapter 8 2 Updated Environmental Report, File No. 127690-003 (LIC-20-0013, ML 20202A654); LIC-21-0005, License Amendment Request (LAR) 21-01, Chapter 8, 15, Omaha Public Power District, Avian Protection Plan CAC; ML21271A143; ML21271A144; ML21271A145; ML21271A148; ML21271A149; ML21271A150; ML21271A151; ML21271A152; ML21271A153; ML21271A172; ML21271A173; ML21271A174; ML21271A175; ML21271A176; ML21271A177; ML21271A180; ML21271A182; ML21271A183; ML21271A184; ML21271A185; ML21271A192; ML21271A193; ML21271A194; ML21271A196; ML21271A197; ML21271A198; ML21271A199; ML21271A200; ML21271A206; ML21271A207; ML21271A208; ML21271A209; ML21271A210; ML21271A211; ML21271A212; ML21271A213; ML21271A214; ML21271A215; ML21271A219; ML21271A258; ML21271A259; ML21271A260; ML21271A261; ML21271A262; ML21271A265; ML21271A266; ML21271A267; ML21271A268; ... further results
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ispr FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 1 of 48 FC-19-006 Revision 0 Ludlum Model 44-10 Detector Sensitivity Prepared By: SG Zoller< 12/11/19 Date-Reviewed By: RF Yetter 12/11/19 Date Approved By: DR Whisler 12/11/19 Date

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FC-19-006 Omaha Public Power District ReVJSJOn 0 Ludlum Model 44-10 DetectorSensitivity Page 2 of 48 1.0 ISSUE STATEMENT Ludlum Model 44-10 detectors are commonly used to detect gamma emitting radionuclides using portable instrumentation. An analysis of the response of the 44-10 detector is needed to qualify detectors and determine the Minimum Detectable Concentration (MDC) at the Fort Calhoun Station (FCS) site locations where Co-60 and Cs-137 are potentially present as radioactive contamination.

2.0 BACKGROUND

STATEMENT Published sensitivity for the Ludlum 44-10 detector is listed in the manufacturer's literature as 900 cpm/uR/hr for Cs-137. Table 6.7of NUREG-1575 lists the Co-60 and Cs-137 sensitivity for a 5.08 by 5.08 cm Nal detector as 430 and 900 cpm/uR/hr, respectively. A study was performed at the Rancho Seco Nuclear Generating Station (RSNGS) to confirm the manufacturer's literature. The values derived from the study will be used in this paper as they were derived empirically.

3.0 METHODOLOGY 3.1 Qualify the response of the vendors Nal detector to Cs-137 and Co-60 sources based on a study performed at a previous reactor decommissioning.

3.2 Identify detectable residual soil concentrations for Co-60 and Cs-137 radionuclides at the FCS site locations where the soil nuclide fractions are consistent with the data provided in this document. The evaluation includes consideration for using Co-60 or Cs-137 as surrogate radionuclides.

4.0 ASSUMPTIONS 4.1 The conclusions of this paper are limited to (2" x 2") 5.08 by 5.08 cm Nal detectors

5.0 CONCLUSION

S 5.1 This paper evaluates the sensitivity of the Ludlum Model 44-10 2.0" x 2.0" (5.08 x 5.08 cm) Nal detector when used to scan open land areas as a function of background, scan speed, and radionuclide mixture. Graphs of detector MDC as a function of background for various scan speeds are presented for Co-60, Cs-137, and a mixture of Co-60 and Cs-137. Utilizing the calculations and results, the detector MDC can be derived or calculated for various ratios, field conditions, and survey parameters.

6.0 CALCULATIONS 6.1 Response Factor 6.1.1 Determination of detector response factors at the RSNGS were conducted for both the Eberline Model SPA-3 and Ludlum Model 44-10 detectors. Only the information relative to the response of the Ludlum Model 44-10 will be addressed at this time. Two NIST traceable sources were used, Co-60 and Cs-137. For both sealed sources the active area is very small when compared to

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FC-19-006 Omaha Puttie Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 3 of 48 the detector size and the distance from the source face to the detector centerline (located at 2.54 cm beyond the detector end cap).

Cable connection End Cap The evaluation process to determine detector response factors for Cs-137 and Co-60 are provided in Attachment 8.1. The results are presented in Table 1.0 below.

Table 1.0 Nal Response Factors for Ludlum Model 44-10 Detector Microshield' 44-10 (5.08x5.08 cm)

Source to Detector Derived nR/h CPMVR/h Distance (cm)

Co-60 Cs-137 Co-60 Cs-137 7.62 24.12 410.1 15.24 6.032 128.1 387.3 868.4 30.48 1.508 32.01 502.5 933.1 60.96 8.001 1021.7 Average 433.3 941.1 The average Cs-137 response factor for the 44-10 Nal detector is 941.0 cpm/jaR/h. The value is consistent with the results found in NUREG-1575 Table 6.7. The average Co-60 value for the 44-10 Nal detector is 433 cpm/laR/h. This result is also consistent with the value reported in Table 6.7 of NUREG-1575. It is important to note that the principle gamma energy response for Cs-137 and Co-60 are in air and from a point source. The Nal detectors response will be greater for the lower energy gammas resulting from the scattering processes associated with the nuclides being distributed in soil media.

6.2 Model for Determination of Nal Detector Soil MDC:

6.2.1 The MARSSIM suggested scan speed of 0.5 m/s is used with the elevated (soil) area of interest being 0.196 m2 that relates to contaminants in a 50 cm diameter region that is 15 cm deep. The depth is consistent with the EPA and NRC definition of surface soils. The soil density is assumed at 1.6 g/cm3 and the composition used for the MicroShield' custom material soil model is composed of silicon oxide (sand). Recent acquisition of surface and subsurface soil sampling at the FCS indicate construction grade soils consisting primarily of loamy clay, sand and gravels that are of similar density values. The Nal detector height from the surface is varied and assumes surface to detector center distances of 3.0 (7.62 cm), 4.0 (10.16 cm) and 6.0 (15.24 cm) inches (2.0, 3.0, and 5.0 inches from the detector end cap). These distances provide reasonable estimates of the variation of detector height above the surface during scanning operations. The 50-centimeter diameter

BSSlSiS FC-19-006 Omaha Puhlic Power District ReVJSJOn 0 Ludlum Model 44-10 Detector Sensitivity Page 4 of 48 area is selected to provide a detector residence time of one second using a scan rate of 0.5 meters per second. It should be noted that soil scan surveys can result in detector residence times greater than one second. To this end, scan measurements are expected to result in conservative MDC values. The Model 44-10 Nal count rate conversion to exposure rate from Table 1.0 is used for each of the principle gamma emitting radionuclides. A surveyor efficiency of 0.5 and a d' (index of sensitivity) of 1.38 is included in the MDC determination.

Inclusion of the surveyor efficiency and training of the surveyors to both listen for the instrument count rate and perform specific investigations following instrument alarms add conservatism to the MDC determination. Finally, the 50 cm diameter by 15 cm thick soil media assumes uniform distribution of the suspect radionuclides.

6.3 Soil Radionuclide Distribution 6.3.1 The soil nuclide fraction for Co-60 is assumed to be 0.10 with Cs-137 comprising the remaining fraction. Values are also included for soils containing 100 percent Co-60 or Cs-137. As soil characterization progresses, the MDC values provided in this paper may be adjusted if significant nuclide fraction differences (+/-20%) are noted. Other soil nuclide compositions and subsequent action levels will be developed based or soil characterization results.

6.4 MicroShield' Code Runs and Derived MDC Values 6.4.1 Specific MicroShield' code runs (See Attachment 8.2) were conducted to determine the exposure rate for the individual or combined nuclides. The code runs are based on the above dimensions, soil composition and density for a 1.0 pCi/g concentration. These values are consistent with guidance provided in NUREG-1575 and 1757 Volume 2 Rev 1.

The data in Attachment 8.2 presents the exposure rate results for various Cs-137 and Co-60 soil nuclide mixtures. The nuclide mix is used in the Microshield' code runs to derive exposure rate values based on the source to detector geometry. The spreadsheets in Attachments 8.3 utilized the MARSSIM guidance and formula, the detector response to the gamma emitting nuclides and the conversion basis for detector cpm to soil pCi/g concentration.

Graphical presentation of the results is included. Table 2.0 compares the derived MDC results for the varied nuclide fractions and assumes an ambient background of 6,000 cpm for the Ludlum Model 44-10 (for the formula see Attachment 8.4, Scan MDC Formula and pCi/g Determination Example).

Detector response to Co-60 (1.0 nuclide fraction) results in a higher response (sensitivity) than for Cs-137 (1.0 nuclide fraction) and illustrates that if the Co-60 nuclide fraction increases the MDC will decrease

FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 5 of 48 Table 2.0 44-10 Detector Scan MDC (pCi/g)*

for Varied Cs-137 and Co-60 Nuclide Fractions Scan Speed = 0.5 m/s Nuclide Nuclide Fraction Nuclide Nuclide Detector Distance** Fraction Cs-137 90% Fraction Fraction Inches (cm) Cs-137 95%

Co-60 10% Cs-137 100% Co-60 100%

Co-60 5%

2.0 (5.08) 4.35 4.1 4.7 2.5 3.0 (7.62) 5.2 4.8 5.7 3.0 6.0(15.24) 7.2 6.7 7.8 4.2 Detector Background assumed at 6,000 cpm.

"Distance from detector end-cap to soil surface 6.5 Observations and Results 6.5.1 Table 2.0 above presents the evaluation results. The results show that as the Co-60 nuclide fraction increases the MDC decreases. At other reactor decommissioning sites Cs-137 was the dominant radionuclide. Both Maine Yankee and Rancho Seco reported an averaged soil Cs-137 content of > 90 percent. An initial nuclide fraction of 0.9 and 0.1 for Cs-137 and Co-60 will be used for site characterization surveys at FCS. Site characterization data will be continually assessed and used to update the soil or structure radionuclide mixture MDC and action levels.

6.6 Survey Techniques 6.6.1 Detector background during land scanning operations is expected to range between 4.00E+03 and 6.00E+03 cpm. Tables 2.0 and 3.0 illustrate the MDCs (in pCi/g) for various distances and scan speeds. Identification of regions of potential contamination is based on the ability of the surveyor to distinguish an increase in count rate during the scanning operation. The surveyor is required to maintain the selected scan speed and detector distance from the suspect surface. Surveyor scanning sensitivity is discussed in chapter 6.0 of NUREG-1575 and NUREG-1507. Other survey techniques that may improve scan sensitivity include: use of the latching mode parameter of the data logging survey instrument (Ludlum 2350-1) to capture the maximum count rate when scanning a suspect surface, changing the instrument (Ludlum 2350-1) time constant from variable to a fixed 1.0 second time constant to increase the instruments response rate and setting the instrument alarm level. Each of the above features augments the surveyor's efficiency for detecting areas of elevated activity.

irtjjK FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 6 of 48 Table 3.0 Ludlum 44-10 Detector MDC (pCi/g)*

(Cs-137 Nuclide Fraction 1.0)

Detector Distance** Scan Speed Scan Speed Inches (cm) 0.5 m/s 0.25 m/s 2.0(5.08) 4.7 3.4 3.0(7.62) 5.7 4.0 6.0(15.24) 7.8 5.5

'Detector background assumed at 6,000 cpm.

"Distance from detector end-cap to soil surface

7.0 REFERENCES

7.1 Decommissioning Technical Basis Document DTBD-05-012 V-0, 11/7/05 (Evaluation of Eberline SPA-3 and Ludlum 44-10 cpm per uR/h Response Factors Robert F. Decker, August 19, 2004), Rancho Seco Nuclear Generating Station 7.2 NUREG-1575, Rev 1, "Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM)" August 2000.

7.3 NUREG-1757, V2, Rev 1, "Consolidated Decommissioning Guidance: Characterization, Surveys and Determination of Radiological Criteria" September 2006.

7.4 NUREG-1505, Rev 1, "A Nonparametric Statistical Methodology for the Design and Analysis of Final Status Decommissioning Surveys" June 1998.

8.0 ATTACHMENTS 8.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results Evaluation of SPA-3 and Ludlum 44-10 cpm per uR/h Response Factors for Co-60 Microshield' runs for 7.62, 15.24 and 30.48 cm for Co-60 Source Certificate for Co-60 Serial Number 214-17-195 (SCN 335)

Evaluation of SPA-3 and Ludlum 44-10 cpm per uR/h Response Factors for Cs-137 Microshield' runs for 15.24, 30.48 and 60.96 cm for Cs-137 Source Certificate for Cs-137 Serial Number LY 376 (SCN 618)

Nal Response Factors for SPA-3 and 44-10 Detectors for Co-60 Nal Response Factors for SPA-3 and 44-10 Detectors for Cs-137

FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 7 of 48 8.2 MicroShield' Code Runs for Various Distances and Nuclide Fractions Co-60 nuclide fraction equals 1.0. Distance equals 7.62, 10.16 and 15.24 centimeters from detector centerline.

Cs-137 nuclide fraction equals 1.0. Distance equals 7.62, 10.16 and 15.24 centimeters from detector centerline.

Co-60 nuclide fraction equals 0.05 and Cs-137 nuclide fraction equals 0.95. Distance equals 7.62, 10.16 and 15.24 centimeters from detector centerline.

Co-60 nuclide fraction equals 0.10 and Cs-137 nuclide fraction equals 0.90. Distance equals 7.62, 10.16 and 15.24 centimeters from detector centerline.

8.3 Scan MDC (pCi/g) for Various Nuclide Fractions of Co-60 and Cs-137 Co-60 nuclide fraction equals 1.0. Distance is as noted in Section 8.2. Scan speed equals 0.5 m/s.

Cs-137 nuclide fraction equals 1.0. Distance is as noted in Section 8.2. Scan speed equals 0.5 m/s.

Cs-137 nuclide fraction equals 1.0. Distance is as noted in Section 8.2. Scan speed equals 0.25 m/s.

Co-60 nuclide fraction equals 0.05 and Cs-137 nuclide fraction equals 0.95. Distance is as noted in Section 8.2. Scan speed equals 0.5 m/s.

Co-60 nuclide fraction equals 0.10 and Cs-137 nuclide fraction equals 0.90. Distance is as noted in Section 8.2. Scan speed equals 0.5 m/s.

Co-60 nuclide fraction equals 0.10 and Cs-137 nuclide fraction equals 0.90. Distance is as noted in Section 8.2. Scan speed equals 0.25 m/s.

8.4 Scan MDC Formula and pCi/g Determination Example

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FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 8 of 48 Attachment 8.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results Evaluation of Eberline SPA-3 and Ludlum 44-10 cpm per jJRJh Response Factors August 19, 2004 RFD The Nal detectors provided by Eberline and Ludlum include cpm per //R/h response factors for specific nuclides.

The instructions below are used to evaluate the response of both detectors to Co-60. The results of the evaluation are to confirm manufacturer results or modify the response factors accordingly.

Equipment:

Calibrated Eberline E-600 and Ludlum 2350-1

Eberline SPA-3 and Ludlum 44-10 detectors

IPL Co-60 Source 214-17-195 8/1/1988 0.891 //Ci

Tape measure

Materials to position the source and detector approximately 3 feet above the floor

Materials to record the results of testing (utilize data logging features) and boxes provided in the table below.

Co-60 source: 0.891 /vCi on 8-1-88. Decay corrected activity is 3.995 kBq (0.108 //Ci) on 8-19-04.

Microshield' runs attached for point source at 7.62,15.24 and 30.48 cm (3, 6 & 12 inches to centerline of detector active area)

Nal Response Factors for SPA-3 and 44-10 Detectors Distance Derived SPA-3 Estimate SPA-3 Observed 44-10 Estimated 44-10 Observed (cm) fjRIh 7.62 24.12 1.447E+04 cpm 9.3217E+03 cpm 1.0372E+04cpm 9.8920E+03 cpm 15.24 6.032 3.619E+03 cpm 2.7440E+03 cpm 2.5938E+03 cpm 2.3361 E+03 cpm 30.48 1.508 9.048E+02 cpm 6.8530E+01 cpm 6.4844E+02 cpm 7.5780E+02 cpm Estimates based on vendor value of 600 and 430 cpm/u.R/h for SPA-3 and 44-10, respectively.

Determination is conducted in an open area with the detector and source elevated 1.0 meter above the surface.

Walls and other solid obstructions should be at least 2 meters from the source and detector. The objective is to minimize scattering effects.

Each measurement is conducted in the scaler mode for the instrument and the measurement (count) time is 10 minutes.

Background is evaluated by performing a 10-minute count prior to the tests and with the source removed from the area.

Background cpm value: SPA 8525, 44 8661 To determine the response to Co-60 the net counts per minute are divided by the //R/h provided for the specific distance.

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FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 9 of 48 MicroShield v5.05 (5.05-00488)

Sacramento Municipal Uitility District Page :1 File Ref:

DOS File : Casel Date Run Date .August 24, 2004 By Run Time: 7:45:23 AM Checked Duration : 00:00:00 Case

Title:

Co-60

Description:

Nal Response Check @ 7.62 cm Geometry: 3 - Disk Source Dimensions Radius 0.238 cm 0.1 in Dose Points X Y Z

1 7.62 cm 0 cm 0 cm 3.0 in 0.0 in 0.0 in Shields Shield Name Material Density Air Gap Air 0.00122 Source Input Grouping Method : Actual Photon Energies Nuclide curies becquerels uCi/cm2 Bq/cm2 Co-60 1.0797e-007 3.9950e+003 6.0931e-001 2.2544e+004 Buildup The material reference is : Air Gap Integration Parameters Radial 20 Circumferential 20 Results Enerqv Activity Fluence Rate Fluence Rate Exposure Rate Exposure Rate MeV Dhotons/sec MeV/cm2/sec MeV/cm2/sec mR/hr mR/hr No Buildup With Buildup No Buildup With Buildup 0.6938 6.517e-01 6.189e-04 6.193e-04 1.195e-06 1.196e-06 1.1732 3.995e+03 6.417e+00 6.419e+00 1.147e-02 1.147e-02 1.3325 3.995e+03 7.288e+00 7.291e+00 1.264e-02 1.265e-02 "OTALS: 7.991e+03 1.371e+01 1.371e+01 2.411e-02 2.412e-02

iSpr FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 10 of 48 MicroShield v5.05 (5.05-00488)

Sacramento Municipal Uitility District File Ref:

Page :1 Date DOS File : Casel Run Date: August 24, 2004 By Checked Run Time: 7:47:04 AM Duration .00:00:00 Case

Title:

Co-60

Description:

Nal Response Check @ 15.24 cm Geometry: 3 - Disk Source Dimensions Radius 0.238 cm 0.1 in Dose Points X Y Z

1 15.24 cm 0 cm 0 cm 6.0 in 0.0 in 0.0 in Shields Shield Name Material Density Air Gap Air 0.00122 Source Input Grouping Method : Actual Photon Energies Nuclide curies becauerels uCi/cm2 Bq/cm2 Co-60 1.0797e-007 3.9950e+003 6.0931e-001 2.2544e+004 Buildup The material reference is : Air Gap Integration Parameters Radial 20 Circumferential 20 Results Activity Fluence Rate Fluence Rate Exposure Rate Exposure Rate Energy MeV/cm2/sec MeV/cm2/sec mR/hr mR/hr MeV photons/sec No Buildup With Buildup No Buildup With Buildup 1.547e-04 1.549e-04 2.986e-07 2.990e-07 0.6938 6.517e-01 1.604e+00 1,605e+00 2.866e-03 2.869e-03 1.1732 3.995e+03 1.822e+00 1.823e+00 3.161e-03 3.163e-03 1.3325 3.995e+03 3.426e+00 3.429e+00 6.027e-03 6.032e-03 TOTALS: 7.991e+03

<rti£K FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 11 of 48 MicroShield v5.05 (5.05-00488)

Sacramento Municipal Uitility District Page :1 File Ref DOS File : Casel Date Run Date: August 24, 2004 By Run Time: 7:48:15 AM Checked Duration : 00:00:00 Case

Title:

Co-60

Description:

Nal Response Check @ 30.48 cm Geometry: 3 - Disk Source Dimensions Radius 0.238 cm 0.1 in Dose Points X Y Z

1 30.48 cm 0 cm 0 cm 1 ft 0.0 in 0.0 in Shields Shield Name Material Density Air Gap Air 0.00122 Source Input Grouping Method : Actual Photon Energies Nuclide curies ,becquerels uCi/cm2 Ba/cm2 Co-60 1.0797e-007 3.9950e+003 6.0931 e-001 2.2544e+004 Buildup The material reference is : Air Gap Integration Parameters Radial 20 Circumferential 20 Results Energy Activity Fluence Rate Fluence Rate Exposure Rate Exposure Rate MeV photons/sec MeV/cm2/sec MeV/cm2/sec mR/hr mR/hr No Buildup With Buildup No Buildup With Buildup 0.6938 6.517e-01 3.862e-05 3.871 e-05 7.456e-08 7.474e-08 1.1732 3.995e+03 4.006e-01 4.012e-01 7.158e-04 7.170e-04 1.3325 3.995e+03 4.550e-01 4.557e-01 7.895e-04 7.906e-04 TOTALS: 7.991 e+03 8.557e-01 8.570e-01 1.505e-03 1,508e-03

%y° FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 12 of 48

&)iiJsz <y CERTIFICATE OF GAMMA STANDARD SOURCE Radionuclide:. Co-60 . Half-life: 5.271^ + 0.0005 Customer: MS^gNggc!H!^I?AL pa No-: RN 880525589 Catalog No.: GF-060 Snnrr.P. No.:?J___2z__$Reference Date: AUG, Contained Radioactivity: 0-891 uCi Description of Source

a. Capsule type: D

b. Nature of'active deposit: EVAPORATED METALLIC SALTS

c. Active diameter: 0.187"

d. Backing: N/A

e. Cover: _ N/A Radloimpurities NONE DETECTED Method of Calibration

( X ) The source was assayed by gamma spectrometry, integrating under the . 1.1?3 & 1.332 Mev peak(s). The branching ratio(s) used was/were l.o & 1.0 gamma rays per decay.

( ) The source was prepared from a weight aliquot of solution whose activity In uCi/gram was determined by the method above.

Uncertainty of Measurement

a. Systematic uncertainty in instrument calibrations 1.3 ' %

b. Random uncertainty

1. In assay: +/- 1.1 { %

2. In weighing(s): +/- _ IV

c. Total Uncertainty: +/- ___+ % at the 99% confidence level.

NBS Traceabllity This calibration is implicitly traceable to the National Bureau of Standards.

Notes

1. Nuclear data were taken from "Table of Isotopes", Seventh Edition edited bv C. Michael Lederer et al.

2. IPL participates In an NBS measurement assurance program to establish and maintain implicit traceabillty for anumber of nuclides, based on the blind assay (and later NBS certification) of Standard Reference Materials (As In NRC Regulatory Guide 4.15)

WU.J p. a-l/*-"~-<' y Quality Control ISOTOPE PRODUCTS LABORATORIES 1800 No. Keystone St., Burbank, California 91504 (818) 843-7000

^y" FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 13 of 48 Evaluation of Eberline SPA-3 and Ludlum 44-10 cpm per uR/h Response Factors August 19, 2004 RFD The Nal detectors provided by Eberline and Ludlum include cpm per (iR/j response factors for specific nuclides.

The instructions below are used to evaluate the response of both detectors to Cs-137. The results of the evaluation are to confirm manufacturer results or modify the response factors accordingly.

Equipment:

Calibrated Eberline E-600 and Ludlum 2350-1

Eberline SPA-3 and Ludlum 44-10 detectors

AEA Cs-137 Source 68970 - LY 376

Tape Measure

Material to position the source and detector approximately 3 feet above the floor

Material to record the results of testing (utilize data logging features) and boxes provided in table below.

Cs-137 Source: 344 kBq (9.297 u.Ci) on 10/1/03. Decay corrected is 337.1 kBq (9.111 u.Ci) on 8/18/04 MicroShield' runs attached for point source at 15.24, 30.48 and 60.96 cm (6,12 & 24 inches to centerline of detector active area.

Nal Response Factors for SPA-3 and 44-10 Detectors Distance Derived SPA-3 SPA-3 44-10 44-10 (cm) uR/h Estimate Observed Estimate Observed 15.24 128.1 1.537E+05 1.3642E+05 1.153E+05 1.228E+05 30.48 32.01 3.841 E+04 4.361 E+04 2.881 E+04 4.143E+04 60.96 8.001 9.601 E+03 9.601 E+03 7.201 E+03 1.974E+04 Estimates based on 1200 and 900 cpm for SPA-3 and 44-10, respectively Determination is conducted in an open area with the detector and source elevated 1.0 meter above the surface.

Walls and other obstructions should be at least 2 meters form the source and detector. The objective is to minimize scattering effects.

Each measurement is conducted in the scalar mode for the instrument and the measurement (count) time is 10.0 minutes.

Background is evaluated by performing a 10 minute count prior to the tests and with the source removed from the area.

Background cpm value: SPA-3 = 8525, 44-10 = 8661 To determine the response to Cs-137 the net counts per minute are divided by the \iRlh provided for the specific distance.

<ft*K FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 14 of 48 MicroShield v5.05 (5.05-00488)

Sacramento Municipal Uitility District

^age ;1 File Ref DOS File : Casel Date Run Date: August 17, 2004 By RunTime: 11:31:58 AM Checked Duration : 00:00:00 Case

Title:

9.11 uCi Cs-137

Description:

Point Source at 15.24 cm Geometry: 1 - Point Dose Points X 1 Z

1 15.24 cm 0 cm 0 cm 6.0 in 0.0 in 0.0 in Shields Shield Name Material Density Air Gap Air 0.00122 Source Input Grouping Method : Actual Photon Energies Nuclide curies becquerels Ba-137m 8.6188e-006 3.1890e+005 Cs-137 9.1108e-006 3.371 Oe+005 1 Buildup The material reference is : Air Gap Results Energy Activity Fluence Rate Fluence Rate Exposure Rate Exposure Rate MeV photons/sec MeV/cm2/sec MeV/cm'/sec mR/hr mR/hr No Buildup With Buildup No Buildup With Buildup 0.0318 6.602e+03 7.157e-02 7.206e-02 5.962e-04 6.003e-04 0.0322 1.218e+04 1.336e-01 1.345e-01 1,075e-03 1.083e-03 0.0364 4.433e+03 5.502e-02 5.540e-02 3.126e-04 3.147e-04 0.6616 2.869e+05 6.496e+01 6.504e+01 1.259e-01 1.261e-01 TOTALS: 3.102e+05 6.522e+01 6.530e+01 1.2796-01 1.281e-01

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FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 15 of 48 MicroShield v5.05 (5.05-00488)

Sacramento Municipal Uitility District 3age :1 File Ref:

DOS File : Casel Date Run Date: August 17, 2004 By RunTime: 11:29:10 AM Checked Duration : 00:00:00 Case

Title:

9.11 uCi Cs-137

Description:

Point Source at 30.48 cm Geometry: 1 - Point Dose Points X _ Z

1 30.48 cm 0 cm 0 cm 1 ft 0.0 in 0.0 in Shields Shield Name Material Density Air Gap Air 0.00122 Source Input Grouping Method : Actual Photon Energies Nuclide curies becquerels Ba-137m 8.6188e-006 3.1890e+005 Cs-137 9.1108e-006 3.3710e+005 i

Buildup The material reference is : Air Gap Results Enerqv Activity Fluence Rate Fluence Rate Exposure Rate Exposure Rate MeV photons/sec MeV/cm2/sec MeV/cm2/sec mR/hr mR/hr No Buildup With Buildup No Buildup With Buildup 0.0318 6.602e+03 1.779e-02 1.8046-02 1.4826-04 1.5036-04 0.0322 1.218e+04 3.323e-02 3.368e-02 2.674e-04 2.7116-04 0.0364 4.433e+03 1.369e-02 1.3886-02 7.779e-05 7.885e-05 0.6616 2.869e+05 1.622e+01 1.626e+01 3.144e-02 3.151e-02 TOTALS: 3.102e+05 1.628e+01 1.632e+01 3.193e-02 3.201 e-02

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FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 16 of 48 MicroShield v5.05 (5.05-00488)

Sacramento Municipal Uitility District

^age :1 File Ref DOS File: Casel Date Run Date: August 17, 2004 By RunTime: 11:30:55 AM Checked Duration : 00:00:00 Case

Title:

9.11 uCi Cs-137

Description:

Point Source at 60.96 cm Geometry: 1 - Point Dose Points X _ Z

1 60.96 cm 0 cm 0 cm 2 ft 0.0 in 0.0 in Shields Shield Name Material Density Air Gap Air 0.00122 Source Input Grouping Method : Actual Photon Energies Nuclide curies becquerels Ba-137m 8.6188e-006 3.1890e+005 Cs-137 9.1108e-006 3.3710e+005

( Buildup The material reference is : Air Gap Results Energy Activity Fluence Rate Fluence Rate Exposure Rate Exposure Rate MeV photons/sec Mev/cm2/sec MeWcnf/sec mR/hr mR/hr No Buildup With Buildup No Buildup With Buildup 0.0318 6.602e+03 4.399e-03 4.521 e-03 3.665e-05 3.766e-05 0.0322 1.218e+04 8.216e-03 8.444e-03 6.612e-05 6.795e-05 0.0364 4.433e+03 3.391 e-03 3.484e-03 1.9266-05 1.9806-05 0.6616 2.869e+05 4.042e+00 4.062e+00 7.837e-03 7.875e-03 TOTALS: 3.102e+05 4.058e+00 4.079e+00 7.959e-03 8.001e-03

1&pr FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 17 of 48 461. Issue 4.03-01-03 AEATECHNOLOCY AEA Technology QSAGmbH Giesclweg 1 38110 Braunschweig CERTIFICATE Postfach 11 37 38001 Braunschweig No. 68970 - LY 376 Germany Tel. +49(0)5307 932-0 for a Sealed Radioactive Source Fax +49(0)5307 932-194 17 September 2003 Source Type: Reference Source Product code CDRX1476 Drawing VZ-477/2 Source no. LY 376 Nuclide Caesium-137 Measurement Data Activity 344 kBq Uncertainty* 3%

Reference date 1 October 2003 Traceability* Defined on page 2 Radioactive impurities Related to Cs-137 (equal 100 %) the following radioactive impurities were detected: Cs-134 < 0.1 %

Leakage and Contamination Test/s Test method/s* II and I Test/s passed on 16 September 2003 Additional Information ISO classification* C.34313

see page 2 fcr explanation AEA Technology QSA GmbH e'.A tf£ (Production Manager) soJauf

FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 18 of 48 TA-cceiY+ ft 03'0 5-~?

Explanations for Certificates (Page 2 of Certificates)

Uncertainty Traceability The reported uncertainty Is This certificate documents the AEA Technology QSA GmbH This product complies with the based on standard uncertainty traceability of measurement has been accredited as DKO requirements for traceability to multiplied by a coverage factor results to national standards, (Deutscher Kalibrierdienst) NIST specified in the American k ~ 2, providing a level of standard measuring equipment calibration laboratory by the National Standard Traceability confidence of approximately and methods for the realisation Physikalisch-Technische Bun- of Radioactive Sources to the 95%. (ISO Guide, 1995) of physical units of measure desanstalt (PTB) and Is NIST and Associated Instru ment according to the Inter authorized to issue reference ment Quality Control (ANSI national System of Units (SI). sources which are traceable to N42.22-1995)".

Traceability is defined as 'the national standards held at the As a requirement for the ANSI property of a result of a PTB in Germany. N42.22-1995 AEA Technology measurement whereby it can Because of the European co QSA participates in the be related to appropriate stan operation for Accreditation NEI/NIST Measurements dards, generally international (EA) mutual recognition Assurance Pro-gram of the or national standards, through agreement the certificates are Nuclear Power Industry.

an unbroken chain of compari also accepted by all EA-sons', members (e. g. NAMAS, UK).

Leakage and contamination tests Stringent tests for leakage are an essential feature of radioactive sources production. They are based on ISO 9978. Some standard methods used for testing radiation sources are listed below.

Wipe test I Immersion test II Bubble test III The source is wiped with a The source is immersed in a The source is immersed in swab or tissue, moistened with suitable liquid at 50 *C for at water or a suitable liquid and ethanol or water, the activity least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and the activity the pressure in the vessel removed is measured. removed is measured. reduced to 13 kPa (100 mm Limit:200 Bq Limit: 185Bq Hg). No bubbles must be (LimitUSA: 5 nCi) observed.

ISO classification The International Organization for Standardization (ISO)has proposed a system of classification of sealed radioactivesources based on safety requirements for typical uses (see ISO 2919), This system providesa manufacturerof sealed radioactivesources with a set of tests to evaluatethe safetyof hisproducts. Italso assists a userofsuch sealedsourcesto select typeswhich suitthe application he has in mind.The tests to whichspecimen sources are subjectedare listedin the following table Classification of sealed source performance standard according to ISO 2919 Class 1 2 3 4 5 e X Temperature No test - 40 "C (20 rnin) C (20 min) - 40 "C (20 min) - 40 "C (20 min) - 40 °C (20 min)

+ 80 *C (1 h) + 180'CO h) + 400 *C (1 h) and thermal shock

+ 600 *C (1 h) and thermal shock

+ 800 -C (1 h) and thermal shock l

400 -C to 20 X 600 "C to 20 "C 800 -C to 20 "C 1 External Notes! 25 kPa absolute 25 kPa absolute 25 kPa absolute 25 kPa absolute 25 kPa absolute ST Pressure to 2 MPa absolute to 7 MPa absolute to 70 MPa abso to 170 MPa ab lute solute Impact No test 50 g from 1 m 200 g from 1 m 2 kg from 1 m 5 kq from 1 m 20 kq from 1 m Vibration No test 3 x 10 min 3 x 10 min 3 x 30 min 25 - 500 Hz at 25-50 Hz at5g 25 - 80 Hz at 5 g peak ampli peak amplitude 1.5 mm amplitude tude and 50 - 80 Hz at peak to peak and 0.635 mm ampli 80 - 2000 Hz at tude peak to peak 20 g peak ampli and 90 - 500 Hz tude at 10gpeak amplitude Puncture No test 1 q from 1 m 10 g from 1 m 50 g from 1 m 300 g from 1 m 1 kq from 1 m Special applications IAEA Special Form Quality assurance System No test programme can cover "Special Form' is a test specifi The quality assurance system all possible combinations of cation for sealed sources given of AEA Technology QSA environments to which a in the IAEA transport regula GmbH was certified by Lloyd's source may be exposed. tions (IAEA Safety Series No. Register Quality Assurance Users should therefore consult 6, 1985, revised edition). (LRQA) according to ISO our experts before using It is used in determining the 9001, issue 1994. Isotrak sources in potentially adverse maximum acceptable activities products meet the require environments. for various types of transport ments of 10CFR50 Appen containers. dix B.

AEATECHNOLOGY, RE1. Issue 3. 2003-03-27

IQ/p-FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 19 of 48 Co-60 Nal Response Factors for SPA-3 and 44-10 Detectors Gross Data Instrument Serial Number Background* 7.62 cm* 15.24 cm* 30.48 cm*

SPA-3 406074 85249 178466 112689 92102 44-10 211672 86613 185533 109974 84191

Ten-minute count results Net Counts Distance (cm) Derived u./h SPA-3 Estimated SPA-3 Observed 44-10 Estimated 44-10 Observed 7.62 24.12 1 4472E+04 9.3217E+03 1 0372E+04 9.8920E+03 15.24 6.032 3.6192E+03 27440E+03 2.5938E+03 2.3361 E+03 30.48 1.508 9.0480E+02 6.8530E+02 6.4844E+02 7.5780E+02 Estimates based on vendor values of 600 and 430 cpm/u/R/h for SPA-3 and 44-10 respectively CPM/uR/h Instrument 7.62 cm 15.24 cm 30.48 cm Averaqe SPA-3 386 455 454 432 44-10 410 387 503 433

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FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 20 of 48 Cs-137 Nal Response Factors for SPA-3 and 44-10 Detectors Gross Data Instrument Serial Number Background 15.24 cm* 30.48 cm 60.96 cm SPA-3 406074 114876 682101 436075 197493 44-10 211672 115620 613988 414299 197366

5-minule couni used for the 6'"(15.24 cm) measurementdue lo high count rate Instrument maxed out with approximately 1.5 minutes to go in a 10 minule count.

Net Counts Distance (cm) Derived u/h SPA-3 Estimated SPA-3 Observed 44-10 Eslimated 44-10 Observed 15.24 128.1 1.5370E+05 1.2493E+05 1.1530E+05 1.1124E+05 30.48 32.01 3.8410E+04 3.2120E+04 2.881 OE+04 2.9868E+04 60.96 8.001 9.6010E+03 8.2617E+03 7.2010E+03 8.1746E+03 Estimates based on vendor values of 600 and 430 cpm/u/R/h for SPA-3 and 44-10 respectively CPM/uR/h Instrument 7.62 cm 15.24 cm 30.48 cm Average SPA-3 975 1003 1033 1004 44-10 868 933 1022 941

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FC-19-006 (kuitiB Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 21 of 48 Attachment 8.2 Microshield' Code Runs MicroShield 8.03 EnergySolutions (8.03-0000)

Date By Checked 12/2/2011 I R. F. Decker Filename Run Date Run Time Duration Casel December 2, 2011 12:14:20 PM 00:00:00 Project Info Case Title Co-60 100%

Description Co-60 100% 2.54, 7.62 and 12.7 cm Geometry 8 - Cylinder Volume - End Shields Source Dimensions Height 15.24 cm (6.0 in)

Radius 25.0 cm (9.8 in)

Dose Points Y

1 0.0 cm (0 in) 20.32 cm (8.0 in) 0.0 cm (0 in)

Shields Shield N Dimension Material Density Source 2.99e+04 cm3 Sand 1.6 Air Gap I Air 0.00122 Source Input: Grouping Method ** Actual Photon Energies Nuclide Ci Bq uCi/cm3 Bq/cm3 Co-60 4.7878e-008 1.7715e+003 1.6000e-006 l 5.9200e-002 Buildup: The material reference is Source Integration Parameters Radial 20 Circumferential 10 Y Direction (axial) 10 Results

n$*y° FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 22 of 48 Fluence Rate Fluence Rate Exposure Rati: Exposure Rate Energy (MeV) Activity (Photons/sec) MeV/cm2/sec MeV/cm2/sec mR/hr mR/hr No Buildup With Buildup No Buildup With Buildup 0.6938 2.890e-01 1.824e-05 3.278e-05 3.521e-08 6.329e-08 1.1732 1.771 e+03 2.224e-01 3.441e-01 3.974e-04 6.150e-04 1 1.3325 1.771 e+03 2.623e-01 3.929e-01 4.550e-04 6.816e-04 Totals 3.543e+03 4.847e-01 7.370e-01 8.525e-04 1.297e-03 Sensitivity Variable Y Dose Point 1 (lof5) (20.32 cm)

_ 0.6938 2.890e-01 1.824e-05 3.278e-05 3.521e-08 6.329e-08 1.1732 1.771 e+03 2.224e-01 3.441 e-01 3.974e-04 6.150e-04 1.3325 1.771 e+03 2.623e-01 3.929e-01 4.550e-04 6.816e-04 Totals 3.543e+03 4.847e-01 7.370e-01 8.525e-04 1.297e-03 Sensitivity Variable Y Dose Point 1 (2 of 5) (22.86 cm) 0.6938 2.890e-01 1.547e-05 2.720e-05 2.986e-08 5.251e-08 1.1732 1.771 e+03 1.873e-01 2.846e-01 3.347e-04 5.086e-04 1.3325 1.771 e+03 2.205e-01 3.247e-01 3.826e-04 5.633e-04 Totals 3.543e+03 4.079e-01 6.093e-01 7.174e-04 1.072e-03 Sensitivity Variable Y Dose Point 1 (3 of 5) (25.4 cm) 0.6938 2.890e-01 1.318e-05 2.282e-05 2.544e-08 4.407e-08 1.1732 1.771 e+03 1.588e-01 2.383e-01 2.838e-04 4.259e-04 1.3325 1.771 e+03 1.868e-01 2.718e-01 3.241 e-04 4.715e-04 Totals 3.543e+03 3.456e-01 5.101e-01 6.079e-04 8.975e-04 Sensitivity Variable Y Dose Point 1 (4 of 5) (27.94 cm) 0.6938 2.890e-01 1.128e-05 1.934e-05 2.179e-08 3.734e-08 1.1732 1.771 e+03 1.356e-01 2.017e-01 2.422e-04 3.604e-04

_ 1.3325 1.771 e+03 1.593e-01 2.299e-01 2.764e-04 3.988e-04 I Totals 3.543e+03 2.949e-01 4.316e-01 5.186e-04 7.593e-04 Sensitivity Variable Y Dose Point 1 (5 of 5) (30.48 cm) 0.6938 2.890e-01 9.718e-06 1.653e-05 1.876e-08 3.192e-08 1.1732 1.771 e+03 1.165e-01 1.723e-01 2.081 e-04 3.079e-04 1.3325 1.771 e+03 1.368e-01 1.963e-01 2.373e-04 3.406e-04 Totals 3.543e+03 2.533e-01 3.686e-01 4.455e-04 6.485e-04

FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 23 of 48 Sensitivity Analysis Summary - Y Dose Point 1 Fluence Rate Fluence Rate Exposure Rate Exposure Rate Sensitivity Dose Point # Sensitivity MeV/cm2/sec MeV/cm2/sec mR/hr mR/hr Dimension No Buildup With Buildup No Buildup With Buildup 1 (1 of 5) (20.32 cm) 4.847e-01 7.370e-01 8.525e-04 1.297e-03 1 (2 of 5) (22.86 cm) 4.079e-01 6.093e-01 7.174e-04 1.072e-03 1 (3 of 5) (25.4 cm) 3.456e-01 5.101e-01 6.079e-04 8.975e-04 1 (4 of 5) (27.94 cm) 2.949e-01 4.316e-01 5.186e-04 7.593e-04 1 (5 of 5) (30.48 cm) 2.533e-01 3.686e-01 4.455e-04 6.485e-04

i-$pk" FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 24 of 48 MicroShield 8.03 EnergySolutions (8.03-0000)

Date By. Checked 12/2/2011 Robert F. Decker Filename Run Date Run Time Duration Casel December 2, 2011 12:29:22 PM 00:00:00 Project Info Case Title Cs-137 100%

Description Cs-137 100% 2.54-12.7 cm Geometry 8 - Cylinder Volume - End Shields Source Dimensions Height 15.24 cm (6.0 in)

Radius 25.0 cm (9.8 in)

Dose Points Y

1 0.0 cm (0 in) 20.32 cm (8.0 in) 0.0 cm (0 in)

Shields Shield N Dimension Material Density Source 2.99e+04 cm3 Sand 1.6 Air Gap Air 0.00122 Source Input: Grouping Method - Actual Photon Energies Nuclide Ci Bq UCi/cm3 Bq/cm3 Ba-137m 4.5292e-008 1.6758e+003 1.5136e-006 5.6003e-002 Cs-137 4.7878e-008 1.7715e+003 1.6000e-006 5.9200e-002 Buildup: The material reference is Source Integration Parameters Radial 20

4&pr FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 25 of 48 Circumferential 10 Y Direction (axial) 10 Results Fluence Rate Fluence Rate Exposure Rate Exposure Rate Energy (MeV) A.ctivity (Photons/sec) MeV/cm2/sec MeV/cm2/sec mR/hr mR/hr No Buildup With Buildup No Buildup With Buildup 0.0045 I 1.740e+01 7.481e-08 7.709e-08 5.127e-08 5.284e-08 0.0318 [_ 3.469e+01 9.338e-06 1.152e-05 7.778e-08 9.599e-08 0.0322 1 6.401 e+01 1.797e-05 2.232e-05 1.446e-07 1.797e-07 0.0364 _[_ 2.329e+01 1.002e-05 1.339e-05 5.691e-08 7.606e-08 0.6616 1 1.508e+03 8.942e-02 1.631e-01 1.734e-04 3.162e-04 Totals 1.647e+03 8.946e-02 1.632e-01 1.737e-04 3.166e-04 Sensitivity Variable Y Dose Point 1 (lof5) (20.32 cm) 0.0045 1.740e+01 7.481e-08 7.709e-08 5.127e-08 5.284e-08 0.0318 _J_ 3.469e+01 9.338e-06 1.152e-05 7.778e-08 9.599e-08 0.0322 1 6.401 e+01 1.797e-05 2.232e-05 1.446e-07 1.797e-07 0.0364 1 2.329e+01 1.002e-05 1.339e-05 5.691e-08 7.606e-08 0.6616 _J_ 1.508e+03 8.942e-02 1.631e-01 1.734e-04 3.162e-04 Totals l_ 1.647e+03 8.946e-02 1.632e-01 1.737e-04 3.166e-04 Sensitivity Variable Y Dose Point 1 (2 of 5) (22.86 cm) 0.0045 l_ 1.740e+01 6.603e-08 6.801e-08 4.526e-08 4.662e-08 0.0318 l_ 3.469e+01 8.221e-06 1.014e-05 6.848e-08 8.448e-08 0.0322 1 6.401 e+01 1.582e-05 1.964e-05 1.273e-07 1.581e-07 0.0364 2.329e+01 8.800e-06 1.175e-05 5.000e-08 6.675e-08 0.6616 1.508e+03 7.588e-02 1.354e-01 1.471 e-04 2.625e-04 Totals 1.647e+03 7.592e-02 1.354e-01 1.474e-04 2.628e-04 Sensitivity Variable Y Dose Point 1 (3 of 5) (25.4 cm) 0.0045 1.740e+01 5.793e-08 5.966e-08 3.971 e-08 4.089e-08 0.0318 3.469e+01 7.200e-06 8.880e-06 5.997e-08 7.397e-08 0.0322 6.401 e+01 1.385e-05 1.719e-05 1.115e-07 1.384e-07 0.0364 2.329e+01 7.697e-06 1.027e-05 4.373e-08 5.835e-08 0.6616 1.508e+03 6.468e-02 1.136e-01 1.254e-04 2.203e-04

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FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 26 of 48 Totals 1.64 7e+03 6.470e-02 1.137e-01 1.256e-04 2.206e-04 Sen; jitivity Variable Y Dose Point 1 (4 of 5) (27.94 cm) 0.0045 1.740e+01 5.066e-08 5.216e-08 3.472e-08 3.575e-08 0.0318 3.469e+01 6.290e-06 7.757e-06 5.240e-08 6.461e-08 0.0322 6.401 e+01 1.210e-05 1.501e-05 9.738e-08 1.208e-07 0.0364 2.329e+01 6.719e-06 8.961e-06 3.818e-08 5.092e-08 0.6616 1.508e+03 5.540e-02 9.629e-02 1.074e-04 1.867e-04 Totals 1.647e+03 5.542e-02 9.632e-02 1.076e-04 1.869e-04 Sensitivity Variable Y Dose Point 1 (5 of 5) (30.48 cm) 0.0045 1.740e+01 4.423e-08 4.554e-08 3.032e-08 3.122e-08 0.0318 3.469e+01 5.493e-06 6.773e-06 4.576e-08 5.642e-08 0.0322 6.401 e+01 1.057e-05 1.311e-05 8.504e-08 1.055e-07 0.0364 2.329e+01 5.865e-06 7.819e-06 3.332e-08 4.442e-08 0.6616 1.508e+03 4.771e-02 8.233e-02 9.250e-05 1.596e-04 Totals 1.647e+03 4.774e-02 8.236e-02 9.269e-05 1.598e-04 Sensitivity / Analysis Sumn lary - Y Dose Point 1 Fluence Rate Fluence Rate '. Exposure Rate Exposure Rate Dose Point # Sensitivity Sensitivity MeV/cm2/sec MeV/cm2/sec mR/hr mR/hr Dimension No Buildup With Buildup No Buildup With Buildup 1 (lof5) (20.32 cm) 8.946e-02 1.632e-01 1.737e-04 3.166e-04 1 (2 of 5) (22.86 cm) 7.592e-02 1.354e-01 1.474e-04 2.628e-04 1 (3 of 5) (25.4 cm) 6.470e-02 1.137e-01 1.256e-04 2.206e-04 1 (4 of 5) (27.94 cm) 5.542e-02 9.632e-02 1.076e-04 1.869e-04 1 (5 of 5) (30.48 cm) 4.774e-02 8.236e-02 9.269e-05 1.598e-04

rfpr FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 27 of 48 MicroShield 8.03 EnergySolutions (8.03-0000) r Date 12/2/2011 1 By Robert F. Decker 1

l Checked Filename Run Date Run Time Duration Casel December 2, 2011 12:50:29 PM 00:00:00 Project Info Case Title 95% Cs-137 5% Co-60 Description Cs-137/Co-60 2.54 - 12.7 cm Geometry 8 - Cylinder Volume - End Shields Source Dimensions Height 15.24 cm (6.0 in)

Radius 25.0 cm (9.8 in)

Dose Points A X Y Z

1 0.0 cm (0 in) 20.32 cm (8.0 in) 0.0 cm (0 in)

Shields Shield N T Dimension Material Density Source 2.99e+04 cm3 Sand 1.6 Air Gap Air 0.00122 Source Input: Grouping Method - Actual Photon Energies Nuclide Ci Bq uCi/cm3 Bq/cm3 Ba-137m 4.3028e-008 1.5920e+003 1.4379e-006 5.3203e-002 Co-60 2.3939e-009 8.8574e+001 8.0000e-008 2.9600e-003 Cs-137 4.5484e-008 1.6829e+003 1.5200e-006 5.6240e-002 Buildup: The material reference is Source Integration Parameters Radial 20

FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 28 of 48 Circumferential I io 1 Y Direction (axial) 10 I Results I Fluence Rate Fluence Rate Exposure Rate Exposure Rate Energy (MeV) Activity (Photons/sec) MeV/cm2/sec MeV/cm2/sec mR/hr mR/hr l_ No Buildup With Buildup No BuUdup With Buildup 0.0045 1.653e+01 7.107e-08 7.323e-08 4.871e-08 5.020e-08 0.0318 3.296e+01 8.871 e-06 1.095e-05 7.389e-08 9.119e-08 0.0322 6.081 e+01 1.707e-05 2.121e-05 1.374e-07 1.707e-07 0.0364 2.213e+01 9.516e-06 1.272e-05 5.407e-08 7.226e-08 0.6616 1.433e+03 8.495e-02 1.550e-01 1.647e-04 3.004e-04 0.6938 1.445e-02 9.120e-07 1.639e-06 1.761e-09 3.165e-09 1.1732 8.857e+01 1.112e-02 1.721e-02 1.987e-05 3.075e-05 1.3325 8.857e+01 1.311e-02 1.964e-02 2.275e-05 3.408e-05 Totals 1.742e+03 1.092e-01 1.919e-01 2.076e-04 3.656e-04 Sensitivity Variable Y Dose Point 1 (lof5) (20.32 cm) 0.0045 1.653e+01 7.107e-08 7.323e-08 4.871e-08 5.020e-08 0.0318 3.296e+01 8.871e-06 1.095e-05 7.389e-08 9.119e-08 0.0322 6.081 e+01 1.707e-05 2.121e-05 1.374e-07 1.707e-07 0.0364 2.213e+01 9.516e-06 1.272e-05 5.407e-08 7.226e-08 0.6616 1.433e+03 8.495e-02 1.550e-01 1.647e-04 3.004e-04 0.6938 1.445e-02 9.120e-07 1.639e-06 1.761e-09 3.165e-09 1.1732 8.857e+01 1.112e-02 1.721e-02 1.987e-05 3.075e-05 1.3325 8.857e+01 1.311e-02 1.964e-02 2.275e-05 3.408e-05 Totals 1.742e+03 1.092e-01 1.919e-01 2.076e-04 3.656e-04 Sensitivity Variable Y Dose Point 1 (2 of 5) (22.86 cm) 0.0045 1.653e+01 6.273e-08 6.461e-08 4.300e-08 4.429e-08 0.0318 3.296e+01 7.810e-06 9.635e-06 6.505e-08 8.026e-08 0.0322 6.081 e+01 1.503e-05 1.866e-05 1.209e-07 1.502e-07 0.0364 2.213e+01 8.360e-06 1.116e-05 4.750e-08 6.341 e-08 0.6616 1.433e+03 7.209e-02 1.286e-01 1.398e-04 2.493e-04 0.6938 1.445e-02 7.734e-07 1.360e-06 1.493e-09 2.626e-09

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FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 29 of 48 1.1732 8.857e+01 9.365e-03 1.423e-02 1.673e-05 2.543e-05 1.3325 8.857e+01 1.103e-02 1.623e-02 1.913e-05 2.817e-05 Totals 1.742e+03 9.251e-02 1.591e-01 1.759e-04 3.033e-04 Sensitivity Variable Y Dose Point 1 (3 of 5) (25.4 cm) 0.0045 1.653e+01 5.504e-08 5.668e-08 3.773e-08 3.885e-08 0.0318 3.296e+01 6.840e-06 8.436e-06 5.697e-08 7.027e-08 0.0322 6.081 e+01 1.316e-05 1.633e-05 1.059e-07 1.314e-07 0.0364 2.213e+01 7.312e-06 9.757e-06 4.155e-08 5.543e-08 0.6616 1.433e+03 6.144e-02 1.079e-01 1.191e-04 2.093e-04 0.6938 1.445e-02 6.589e-07 1.141e-06 1.272e-09 2.203e-09 1.1732 8.857e+01 7.941 e-03 1.192e-02 1.419e-05 2.130e-05 1.3325 8.857e+01 9.340e-03 1.359e-02 1.620e-05 2.357e-05 Totals 1.742e+03 7.875e-02 1.335e-01 1.498e-04 2.544e-04 Sensitivity Variable Y Dose Point 1 (4 of 5) (27.94 cm) 0.0045 1.653e+01 4.812e-08 4.955e-08 3.299e-08 3.396e-08 0.0318 3.296e+01 5.976e-06 7.369e-06 4.978e-08 6.138e-08 0.0322 6.081e+01 1.149e-05 1.426e-05 9.251e-08 1.148e-07 0.0364 2.213e+01 6.383e-06 8.513e-06 3.627e-08 4.837e-08 0.6616 1.433e+03 5.263e-02 9.147e-02 1.020e-04 1.773e-04 0.6938 1.445e-02 5.642e-07 9.669e-07 1.089e-09 1.867e-09 1.1732 8.857e+01 6.778e-03 1.008e-02 1.211e-05 1.802e-05 1.3325 8.857e+01 7.965e-03 1.149e-02 1.382e-05 1.994e-05 Totals 1.742e+03 6.739e-02 1.131e-01 1.282e-04 2.156e-04 Sensitivity Variable Y Dose Point 1 (5 of 5) (30.48 cm) 0.0045 1.653e+01 4.202e-08 4.326e-08 2.880e-08 2.966e-08 0.0318 3.296e+01 5.219e-06 6.434e-06 4.347e-08 5.360e-08 0.0322 6.081e+01 1.004e-05 1.245e-05 8.078e-08 1.002e-07 0.0364 2.213e+01 5.571e-06 7.428e-06 3.165e-08 4.220e-08 0.6616 1.433e+03 4.533e-02 7.821e-02 8.787e-05 1.516e-04 0.6938 1.445e-02 4.859e-07 8.267e-07 9.381e-10 1.596e-09 1.1732 8.857e+01 5.824e-03 8.614e-03 1.041e-05 1.539e-05

isyf FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 30 of 48 1.3325 8.857e+01 6.840e-03 9.816e-03 1.187e-05 1.703e-05 Totals 1.742e+03 5.801e-02 9.667e-02 1.103e-04 1.843e-04 Sensitivity Analysis Summary - Y Dose Point 1

... ._ Fluence Rate Fluence Rate Exposure Rate Exposure Rate Dose Point # Sensitivity Sensitivity MeV/cm2/sec MeV/cm2/sec mR/hr mR/hr Dimension ,, _ ...

No Buildup With Buildup No Buildup With Buildup (1 of 5) (20.32 cm) 1.092e-01 1.919e-01 2.076e-04 3.656e-04 (2 of 5) (22.86 cm) 9.251e-02 1.591e-01 1.759e-04 3.033e-04 1 (3 of 5) (25.4 cm) 7.875e-02 1.335e-01 1.498e-04 2.544e-04 (4 of 5) (27.94 cm) 6.739e-02 1.131e-01 1.282e-04 2.156e-04 (5 of 5) (30.48 cm) 5.801e-02 9.667e-02 1.103e-04 1.843e-04

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FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 31 of 48 MicroShield 8.03 EnergySolutions (8.03-0000)

Date 12/2/2011 I By Robert F. Decker 1

l Checked

=1 Filename Run Date l Run Time Duration Casel December 2, 2011 12:58:06 PM 00:00:00 Project Info Case Title 90% Cs-137 10% Co-6 Description Cs-137/Co-60 2.54-12.7 cm Geometry I 8- Cylinder Volume - End Shields Source Dimensions I Height 15.24 cm (6.0 in)

Radius 25.0 cm (9.8 in)

Dose Points T

Y

1 0.0 cm (0 in) 20.32 cm (8.0 in) 0.0 cm (0 in) *X Shields z

Shield N Dimension Material Density Source 2.99e+04 cm3 Sand 1.6 Air Gap I I Air 0.00122 Source Input: Grouping Method - Actual Photon Energies Nuclide Ci Bq uCi/cm3 Bq/cm3 Ba-137m 4.0763e-008 1.5082e+003 1.3622e-006 5.0403e-002 Co-60 4.7878e-009 1.7715e+002 1.6000e-007 5.9200e-003 Cs-137 4.3090e-008 1.5943e+003 1.4400e-006 5.3280e-002 Buildup>>: The material reference is Source Integration Parameters

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FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 32 of 48 Radial 20 Circumferential ,0 Y Direction (axial) 10 Results Fluence Rate Fluence Rate Exposure Rate Exposure Rate Energy (MeV) Activity (Photons/sec) MeV/cm7sec MeV/cm2/sec mR/hr mR/hr No Buildup With Buildup No Buildup With Buildup 0.0045 1.566e+01 6.733e-08 6.938e-08 4.615e-08 4.756e-08 0.0318 3.123e+01 8.404e-06 1.037e-05 7.000e-08 8.639e-08 0.0322 5.761 e+01 1.617e-05 2.009e-05 1.302e-07 1.617e-07 0.0364 2.096e+01 9.015e-06 1.205e-05 5.122e-08 6.846e-08 0.6616 1.357e+03 8.048e-02 1.468e-01 1.560e-04 2.846e-04 0.6938 2.890e-02 1.824e-06 3.278e-06 3.521e-09 6.329e-09 1.1732 1.771e+02 2.224e-02 3.441 e-02 3.974e-05 6.150e-05 1.3325 1.771e+02 2.623e-02 3.929e-02 4.550e-05 6.816e-05 Totals 1.837e+03 1.290e-01 2.206e-01 2.416e-04 4.146e-04 Sensitivity Variable Y Dose Point 1 (lof5) [20.32 cm) 0.0045 1.566e+01 6.733e-08 6.938e-08 4.615e-08 4.756e-08 0.0318 3.123e+01 8.404e-06 1.037e-05 7.000e-08 8.639e-08 0.0322 5.761 e+01 1.617e-05 2.009e-05 1.302e-07 1.617e-07 0.0364 2.096e+01 9.015e-06 1.205e-05 5.122e-08 6.846e-08 0.6616 1.357e+03 8.048e-02 1.468e-01 1.560e-04 2.846e-04 0.6938 2.890e-02 1.824e-06 3.278e-06 3.521e-09 6.329e-09 1.1732 1.771e+02 2.224e-02 3.441 e-02 3.974e-05 6.150e-05 1.3325 1.771e+02 2.623e-02 3.929e-02 4.550e-05 6.816e-05 Totals 1.837e+03 1.290e-01 2.206e-01 2.416e-04 4.146e-04 Sensitivity Variable Y Dose Point 1 (2 of 5) (22.86 cm) 0.0045 1.566e+01 5.943e-08 6.121e-08 4.073e-08 4.196e-08 0.0318 3.123e+01 7.399e-06 9.128e-06 6.163e-08 7.603e-08 0.0322 5.761 e+01 1.424e-05 1.768e-05 1.146e-07 1.423e-07 0.0364 2.096e+01 7.920e-06 1.057e-05 4.500e-08 6.007e-08 0.6616 1.357e+03 6.830e-02 1.218e-01 1.324e-04 2.362e-04

iSpr FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 33 of 48 0.6938 2.890e-02 1.547e-06 2.720e-06 2.986e-09 5.251e-09 1.1732 1.771e+02 1.873e-02 2.846e-02 3.347e-05 5.086e-05 1.3325 1.771e+02 2.205e-02 3.247e-02 3.826e-05 5.633e-05 Totals 1.837e+03 1.091e-01 1.828e-01 2.044e-04 3.437e-04 Sensitivity Variable Y Dose Point 1 (3 of 5) (25.4 cm) 0.0045 i I 1.566e+01 5.214e-08 5.369e-08 3.574e-08 3.680e-08 0.0318 1 3.123e+01 6.480e-06 7.992e-06 5.398e-08 6.657e-08 0.0322 1 5.761e+01 1.247e-05 1.547e-05 1.003e-07 1.245e-07 0.0364 [_ 2.096e+01 6.928e-06 9.243e-06 3.936e-08 5.252e-08 0.6616 1 1.357e+03 5.821e-02 1.023e-01 1.128e-04 1.982e-04 0.6938 1 2.890e-02 1.318e-06 2.282e-06 2.544e-09 4.407e-09

[ 1.1732 1.771e+02 1.588e-02 2.383e-02 2.838e-05 4.259e-05 1 1.3325 1.771e+02 1.868e-02 2.718e-02 3.241e-05 4.715e-05 Totals 1.837e+03 9.280e-02 1.533e-01 1.739e-04 2.883e-04 Sensitivity Variable Y Dose Point 1 (4 of 5) (27.94 cm) 0.0045 1 1.566e+01 4.559e-08 4.694e-08 3.125e-08 3.218e-08 0.0318 3.123e+01 5.661 e-06 6.981 e-06 4.716e-08 5.815e-08 0.0322 5.761e+01 1.089e-05 1.351e-05 8.764e-08 1.088e-07 0.0364 1 2.096e+01 6.047e-06 8.065e-06 3.436e-08 4.582e-08 0.6616 1 1.357e+03 4.986e-02 8.666e-02 9.666e-05 1.680e-04 0.6938 1 2.890e-02 1.128e-06 1.934e-06 2.179e-09 3.734e-09 1.1732 1.771e+02 1.356e-02 2.017e-02 2.422e-05 3.604e-05 1.3325 1.771e+02 1.593e-02 2.299e-02 2.764e-05 3.988e-05 Totals 1.837e+03 7.937e-02 1.298e-01 1.487e-04 2.442e-04 Sensitivity Variable Y Dose Point 1 (5 of 5) (30.48 cm) 0.0045 1.566e+01 3.981e-08 4.099e-08 2.729e-08 2.809e-08 I 0.0318 3.123e+01 4.944e-06 6.096e-06 4.118e-08 5.078e-08 0.0322 5.761 e+01 9.510e-06 1.180e-05 7.653e-08 9.496e-08 0.0364 2.096e+01 5.278e-06 7.037e-06 2.999e-08 3.998e-08 0.6616 1.357e+03 4.294e-02 7.410e-02 8.325e-05 1.436e-04 0.6938 2.890e-02 9.718e-07 1.653e-06 1.876e-09 3.192e-09

FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 34 of 48 1.1732 1.771e+02 1.165e-02 1.723e-02 2.081e-05 3.079e-05 1.3325 1.7'rle+02 1.368e-02 1.963e-02 2.373e-05 3.406e-05 Totals 1.82(7e+03 6.829e-02 1.110e-01 1.280e-04 2.087e-04 Sensitivity Analysis Summary - Y Dose Point 1 Fluence Rate Fluence Rate Exposure Rate Exposure Rate Sensitivity Dose Point # Sensitivity MeV/cm7sec MeV/cm2/sec mR/hr mR/hr Dimension No Buildup With Buildup No Buildup With Buildup 1

(1 of 5) (20.32 cm) 1.290e-01 2.206e-01 2.416e-04 4.146e-04 (2 of 5) (22.86 cm) 1.091e-01 1.828e-01 2.044e-04 3.437e-04 (3 of 5) (25.4 cm) 9.280e-02 1.533e-01 1.739e-04 2.883e-04 (4 of 5) (27.94 cm) 7.937e-02 1.298e-01 1.487e-04 2.442e-04 (5 of 5) (30.48 cm) 6.829e-02 1.110e-01 1.280e-04 2.087e-04

FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 35 of 48 Attachment 8.3 Scan MDC for Various Nuclide Fractions of Co-60 and Cs-137 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Co-60 1.0 pCi/g Scan Rate 0.5 m/s d' 1.38 Detector end-cap 2.0" above Soil Surface @ Detector Centerline (7.62cm)

Detectable Detectable nR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co-60 Cs-137 cpm second MDCR MUUKsurveyor HR/h l!R/h Total uR/h @ 7.62 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11E+00 0.00E+00 1.11 E+00 1.072 1.0 2.00E+03 3.33E+01 4.78E+02 6.76E+02 1.57E+00 0.00E+00 1.57E+00 1.072 1.47 4.00E+03 6.67E+01 6.76E+02 9.56E+02 2.22E+00 0.00E+00 2.22E+00 1.072 2.07 6.00E+03 1.00E+02 8.28E+02 1.17E+03 2.72E+00 0.00E+00 2.72E+00 1.072 2.54 8.00E+03 1.33E+02 9.56E+02 1.35E+03 3.14E+00 0.00E+00 3.14E+00 1.072 2.93 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 3.52E+00 0.00E+00 3.52E+00 1.072 3.28 1.20E+04 2.00E+02 1.17E+03 1.66E+03 3.85E+00 0.00E+00 3.85E+00 1.072 3.59 1.40E+04 2.33E+02 1.26E+03 1.79E+03 4.16E+00 0.00E+00 4.16E+00 1.072 3.88 1.80E+04 3.00E+02 1.43E+03 2.03E+03 4.72E+00 0.00E+00 4.72E+00 1.072 4.40 2.00E+04 3.33E+02 1.51 E+03 2.14E+03 4.97E+00 0.00E+00 4.97E+00 1.072 4.64 4.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E+00 0.00E+00 7.03E+00 1.072 6.56 6.00E+04 1.00E+03 2.62E+03 3.70E+03 8.61 E+00 0.00E+00 8.61 E+00 1.072 8.03 8.00E+04 1.33E+03 3.02E+03 4.28E+03 9.94E+00 0.00E+00 9.94E+00 1.072 9.28 1.00E+05 1.67E+03 3.38E+03 4.78E+03 1.11E+01 0.00E+00 1.11E+01 1.072 10.37 Co-60 100% Scan Speed 0.5 m/s MDC (in pCi/g) as a Function of Background 18.0 16.0 14.0 5.01 trorrl end- cap 12.0 oo 10.0

'O Tom snd- :ap Q. 8.0

-3 6.0 2 trfn jrrrei id-ca P 4.0 y .^^?

/_.

2.0 0.0 0.0E+00 2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+05 Background (cpm)

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FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 36 of 48 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Co-60 1.0 pCi/g Scan Rate 0.5 m/s d' 1.38 Detector end-cap 3.0" above Soil Surface (5 Detector Centerline (10.16cm)

Detectable Detectable (iR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co-60 Cs-137 cpm second MDCR M UL. Ksun/eyor uR/h uR/h Total uR/h @ 10.16 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11E+00 0.00E+00 1.11E+00 0.8975 1.2 2.00E+03 3.33E+01 4.78E+02 6.76E+02 1.57E+00 0.00E+00 1.57E+00 0.8975 1.75 4.00E+03 6.67E+01 6.76E+02 9.56E+02 2.22E+00 0.00E+00 2.22E+00 0.8975 2.48 6.00E+03 1.00E+02 8.28E+02 1.17E+03 2.72E+00 0.00E+00 2.72E+00 0.8975 3.03 8.00E+03 1.33E+02 9.56E+02 1.35E+03 3.14E+00 0.00E+00 3.14E+00 0.8975 3.50 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 3.52E+00 0.00E+00 3.52E+00 0.8975 3.92 1.20E+04 2.00E+02 1.17E+03 1.66E+03 3.85E+00 0.00E+00 3.85E+00 0.8975 4.29 1.40E+04 2.33E+02 1.26E+03 1.79E+03 4.16E+00 0.00E+00 4.16E+00 0.8975 4.63 1.80E+04 3.00E+02 1.43E+03 2.03E+03 4.72E+00 0.00E+00 4.72E+00 0.8975 5.26 2.00E+04 3.33E+02 1.51E+03 2.14E+03 4.97E+00 0.00E+00 4.97E+00 0.8975 5.54 4.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E+00 0.00E+00 7.03E+00 0.8975 7.83 6.00E+04 1.00E+03 2.62E+03 3.70E+03 8.61 E+00 0.00E+00 8.61 E+00 0.8975 9.59 8.00E+04 1.33E+03 3.02E+03 4.28E+03 9.94E+00 0.00E+00 9.94E+00 0.8975 11.08 1.00E+05 1.67E+03 3.38E+03 4.78E+03 1.11 E+01 0.00E+00 1.11 E+01 0.8975 12.39 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Co-60 1.0 pCi/g Scan Rate 0.5 m/s d' 1.38 Detector end-cap 5.0" above Soil Surface @ Detector Centerline (15.24cm)

Detectable Detectable uR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co-60 Cs-137 cpm second MDCR MDCKsurveyor uR/h uR/h Total uR/h @ 15.24 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11E+00 0.00E+00 1.11 E+00 0.6485 1.7 2.00E+03 3.33E+01 4.78E+02 6.76E+02 1.57E+00 0.00E+00 1.57E+00 0.6485 2.42 4.00E+03 6.67E+01 6.76E+02 9.56E+02 2.22E+00 0.00E+00 2.22E+00 0.6485 3.43 6.00E+03 1.00E+02 8.28E+02 1.17E+03 2.72E+00 0.00E+00 2.72E+00 0.6485 4.20 8.00E+03 1.33E+02 9.56E+02 1.35E+03 3.14E+00 0.00E+00 3.14E+00 0.6485 4.85 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 3.52E+00 0.00E+00 3.52E+00 0.6485 5.42 1.20E+04 2.00E+02 1.17E+03 1.66E+03 3.85E+00 0.00E+00 3.85E+00 0.6485 5.94 1.40E+04 2.33E+02 1.26E+03 1.79E+03 4.16E+00 0.00E+00 4.16E+00 0.6485 6.41 1.80E+04 3.00E+02 1.43E+03 2.03E+03 4.72E+00 0.00E+00 4.72E+00 0.6485 7.27 2.00E+04 3.33E+02 1.51E+03 2.14E+03 4.97E+00 0.00E+00 4.97E+00 0.6485 7.67 4.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E+00 0.00E+00 7.03E+00 0.6485 10.84 6.00E+04 1.00E+03 2.62E+03 3.70E+03 8.61 E+00 0.00E+00 8.61 E+00 0.6485 13.28 8.00E+04 1.33E+03 3.02E+03 4.28E+03 9.94E+00 0.00E+00 9.94E+00 0.6485 15.33 1.00E+05 1.67E+03 3.38E+03 4.78E+03 1.11E+01 0.00E+00 1.11 E+01 0.6485 17.14

9$r FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 37 of 48 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Cs-137 1.0 pCi/g d' = 1.38 Scan Speed = 0.5 m/s Detector end-cap 2.0" above Soil Surface @ Detector Centerline (7.62cm)

Area of interest = 50 cm dia.; d' = 1.38 Detectable Detectable uR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co-60 Cs-137 cpm second MDCR MDCRsurveyor uR/h uR/h Total uR/h @ 7.62 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 0.00E+00 5.09E-01 5.09E-01 0.2628 1.9 2.00E+03 3.33E+01 4.78E+02 6.76E+02 0.00E+00 7.19E-01 7.19E-01 0.2628 2.74 4.00E+03 6.67E+01 6.76E+02 9.56E+02 0.00E+00 1.02E+00 1.02E+00 0.2628 3.87 6.00E+03 1.00E+02 8.28E+02 1.17E+03 0.00E+00 1.25E+00 1.25E+00 0.2628 4.74 8.00E+03 1.33E+02 9.56E+02 1.35E+03 O.OOE+00 1.44E+00 1.44E+00 0.2628 5.47 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 0.00E+00 1.61 E+00 1.61 E+00 0.2628 6.12 1.20E+04 2.00E+02 1.17E+03 1.66E+03 0.00E+00 1.76E+00 1.76E+00 0.2628 6.70 1.40E+04 2.33E+02 1.26E+03 1.79E+03 0.00E+00 1.90E+00 1.90E+00 0.2628 7.24 1.80E+04 3.00E+02 1.43E+03 2.03E+03 0.00E+00 2.16E+00 2.16E+00 0.2628 8.21 2.00E+04 3.33E+02 1.51E+03 2.14E+03 0.00E+00 2.27E+00 2.27E+00 0.2628 8.65 4.00E+04 6.67E+02 2.14E+03 3.02E+03 0.00E+00 3.22E+00 3.22E+00 0.2628 12.24 6.00E+04 1.00E+03 2.62E+03 3.70E+03 0.00E+00 3.94E+00 3.94E+00 0.2628 14.99 8.00E+04 1.33E+03 3.02E+03 4.28E+03 0.00E+00 4.55E+00 4.55E+00 0.2628 17.31 1.00E+05 1.67E+03 3.38E+03 4.78E+03 0.00E+00 5.09E+00 5.09E+00 0.2628 19.35 Cs-137 100% Scan Speed 0.5 m/s MDC (in pCi/g) as a Function of Background 32.0 30.0 28.0 26.0 k "'*" *u

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FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 38 of 48 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Cs-137 1.0 pCi/g d' = 1.38 Scan Speed = 0.5 m/s Detector end-cap 3.0" above Soil Surface @ Detector Centerline (10.16cm)

Detectable Detectable uR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co-60 Cs-137 cpm second MDCR MDCJRsurveyor uR/h uR/h Total uR/h @ 10.16 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 0.00E+00 5.09E-01 5.09E-01 0.2206 2.3 2.00E+03 3.33E+01 4.78E+02 6.76E+02 0.00E+00 7.19E-01 7.19E-01 0.2206 3.26 4.00E+03 6.67E+01 6.76E+02 9.56E+02 0.00E+00 1.02E+00 1.02E+00 0.2206 4.61 6.00E+03 1.00E+02 8.28E+02 1.17E+03 0.00E+00 1.25E+00 1.25E+00 0.2206 5.65 8.00E+03 1.33E+02 9.56E+02 1.35E+03 0.00E+00 1.44E+00 1.44E+00 0.2206 6.52 1.00E+04 1.67E+02 1.07E+03 1.51E+03 0.00E+00 1.61 E+00 1.61 E+00 0.2206 7.29 1.20E+04 2.00E+02 1.17E+03 1.66E+03 0.00E+00 1.76E+00 1.76E+00 0.2206 7.99 1.40E+04 2.33E+02 1.26E+03 1.79E+03 0.00E+00 1.90E+00 1.90E+00 0.2206 8.63 1.80E+04 3.00E+02 1.43E+03 2.03E+03 0.00E+OO 2.16E+00 2.16E+00 0.2206 9.78 2.00E+04 3.33E+02 1.51 E+03 2.14E+03 0.00E+00 2.27E+00 2.27E+00 0.2206 10.31 4.00E+04 6.67E+02 2.14E+03 3.02E+03 0.00E+00 3.22E+00 3.22E+00 0.2206 14.58 6.00E+04 1.00E+03 2.62E+03 3.70E+03 0.00E+00 3.94E+00 3.94E+00 0.2206 17.86 8.00E+04 1.33E+03 3.02E+03 4.28E+03 0.00E+00 4.55E+00 4.55E+00 0.2206 20.62 1.00E+05 1.67E+03 3.38E+03 4.78E+03 0.00E+00 5.09E+00 5.09E+00 0.2206 23.05 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Cs-137 1.0 pCi/g d' = 1.38 Scan Speed = 0.5 m/s Dete :tor end-cap 5.0" above Soil Surface @ Detector Centerline (15.24 ;m)

Detectable Detectable uR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co-60 Cs-137 cpm second MDCR MDCRsurveyor uR/h uR/h Total uR/h @ 15.24 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 0.00E+00 5.09E-01 5.09E-01 0.1598 3.2 2.00E+03 3.33E+01 4.78E+02 6.76E+02 0.00E+00 7.19E-01 7.19E-01 0.1598 4.50 4.00E+03 6.67E+01 6.76E+02 9.56E+02 0.00E+00 1.02E+00 1.02E+00 0.1598 6.36 6.00E+03 1.00E+02 8.28E+02 1.17E+03 0.00E+00 1.25E+00 1.25E+00 0.1598 7.80 8.00E+03 1.33E+02 9.56E+02 1.35E+03 O.OOE+00 1.44E+00 1.44E+00 0.1598 9.00 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 0.00E+00 1.61 E+00 1.61 E+00 0.1598 10.06 1.20E+04 2.00E+02 1.17E+03 1.66E+03 0.00E+00 1.76E+00 1.76E+00 0.1598 11.02 1.40E+04 2.33E+02 1.26E+03 1.79E+03 0.00E+00 1.90E+00 1.90E+00 0.1598 11.91 1.80E+04 3.00E+02 1.43E+03 2.03E+03 0.00E+00 2.16E+00 2.16E+00 0.1598 13.50 2.00E+04 3.33E+02 1.51 E+03 2.14E+03 0.00E+00 2.27E+00 2.27E+00 0.1598 14.23 4.00E+04 6.67E+02 2.14E+03 3.02E+03 0.00E+00 3.22E+00 3.22E+00 0.1598 20.13 6.00E+04 1.00E+03 2.62E+03 3.70E+03 0.00E+00 3.94E+00 3.94E+00 0.1598 24.65 8.00E+04 1.33E+03 3.02E+03 4.28E+03 0.00E+00 4.55E+00 4.55E+00 0.1598 28.46 1.00E+05 1.67E+03 3.38E+03 4.78E+03 0.00E+00 5.09E+00 5.09E+00 0.1598 31.82

^^

FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 39 of 48 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Cs-137 1.0 pCi/g Scan Rate = 0.25 m/s d' = 1.38 Detector end-cap 2.0" above Soil Surface @ Detector Centerline (7.62 cm)

Detectable Detectable UR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 0.5 Co-60 Cs-137 cpm second MDCR MDCRgurveyor UR/h uR/h Total uR/h @ 7.62 cm pCi/g 1.00E+03 8.33E+00 2.39E+02 3.38E+02 0.00E+00 3.60E-01 3.60E-01 0.2628 1.4 2.00E+03 1.67E+01 3.38E+02 4.78E+02 0.00E+00 5.09E-01 5.09E-01 0.2628 1.94 4.00E+03 3.33E+01 4.78E+02 6.76E+02 0.00E+00 7.19E-01 7.19E-01 0.2628 2.74 6.00E+03 5.00E+01 5.85E+02 8.28E+02 0.00E+00 8.81 E-01 8.81 E-01 0.2628 3.35 8.00E+03 6.67E+01 6.76E+02 9.56E+02 0.00E+00 1.02E+00 1.02E+00 0.2628 3.87 1.00E+04 8.33E+01 7.56E+02 1.07E+03 0.00E+00 1.14E+00 1.14E+00 0.2628 4.33 1.20E+04 1.00E+02 8.28E+02 1.17E+03 0.00E+00 1.25E+00 1.25E+00 0.2628 4.74 1.40E+04 1.17E+02 8.94E+02 1.26E+03 0.00E+00 1.35E+00 1.35E+00 0.2628 5.12 1.80E+04 1.50E+02 1.01 E+03 1.43E+03 0.00E+00 1.53E+00 1.53E+00 0.2628 5.81 2.00E+04 1.67E+02 1.07E+03 1.51E+03 O.OOE+00 1.61 E+00 1.61 E+00 0.2628 6.12 4.00E+04 3.33E+02 1.51E+03 2.14E+03 0.00E+00 2.27E+00 2.27E+00 0.2628 8.65 6.00E+04 5.00E+02 1.85E+03 2.62E+03 0.00E+00 2.79E+00 2.79E+00 0.2628 10.60 8.00E+04 6.67E+02 2.14E+03 3.02E+03 0.00E+00 3.22E+00 3.22E+00 0.2628 12.24 1.00E+05 8.33E+02 2.39E+03 3.38E+03 0.00E+00 3.60E+00 3.60E+00 0.2628 13.68 Cs-137 100% Scan Speed 0.25 m/s MDC (in pCi/g) as a Function of Background 24.0 22.0 20.0 18.0 i

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FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 40 of 48 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Cs-137 1.0 pCi/g Scan Rate =i 0.25 m/s d' = 1.38 Detector end-cap 3.0" above Soil Surface @ Detector Centerline (10.16cm)

Detectable Detectable UR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 0.5 Co-60 Cs-137 cpm second MDCR MDCRsurveyor uR/h uR/h Total uR/h @ 10.16 cm pCi/g 1.00E+03 8.33E+00 2.39E+02 3.38E+02 0.00E+00 3.60E-01 3.60E-01 0.2206 1.6 2.00E+03 1.67E+01 3.38E+02 4.78E+02 0.00E+00 5.09E-01 5.09E-01 0.2206 2.31 4.00E+03 3.33E+01 4.78E+02 6.76E+02 0.00E+00 7.19E-01 7.19E-01 0.2206 3.26 6.00E+03 5.00E+01 5.85E+02 8.28E+02 0.00E+00 8.81E-01 8.81 E-01 0.2206 3.99 8.00E+03 6.67E+01 6.76E+02 9.56E+02 0.00E+00 1.02E+00 1.02E+00 0.2206 4.61 1.00E+04 8.33E+01 7.56E+02 1.07E+03 0.00E+00 1.14E+00 1.14E+00 0.2206 5.15 1.20E+04 1.00E+02 8.28E+02 1.17E+03 0.00E+00 1.25E+00 1.25E+00 0.2206 5.65 1.40E+04 1.17E+02 8.94E+02 1.26E+03 0.00E+00 1.35E+00 1.35E+00 0.2206 6.10 1.80E+04 1.50E+02 1.01 E+03 1.43E+03 0.00E+00 1.53E+00 1.53E+00 0.2206 6.92 2.00E+04 1.67E+02 1.07E+03 1.51E+03 0.00E+00 1.61 E+00 1.61 E+00 0.2206 7.29 4.00E+04 3.33E+02 1.51 E+03 2.14E+03 0.00E+00 2.27E+00 2.27E+00 0.2206 10.31 6.00E+04 5.00E+02 1.85E+03 2.62E+03 0.00E+00 2.79E+00 2.79E+00 0.2206 12.63 8.00E+04 6.67E+02 2.14E+03 3.02E+03 0.00E+00 3.22E+00 3.22E+00 0.2206 14.58 1.00E+05 8.33E+02 2.39E+03 3.38E+03 0.00E+00 3.60E+00 3.60E+00 0.2206 16.30 Soil Scan MDC For Ludlum 44- 10 Nal Detector 100% Cs-137 1.0 pCi/g Scan Rate = 0.25 m/s d' = 1.38 Detector end-cap 5.0" above Soil Surface @ Detector Centerline (12.7cm)

Detectable Detectable uR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 0.5 Co-60 Cs-137 cpm second MDCR MDCRsurveyo HR/h UR/h Total uR/h @ 15.24 cm pCi/g 1.00E+03 8.33E+00 2.39E+02 3.38E+02 0.00E+00 3.60E-01 3.60E-01 0.1598 2.3 2.00E+03 1.67E+01 3.38E+02 4.78E+02 0.00E+00 5.09E-01 5.09E-01 0.1598 3.18 4.00E+03 3.33E+01 4.78E+02 6.76E+02 0.00E+00 7.19E-01 7.19E-01 0.1598 4.50 6.00E+03 5.00E+01 5.85E+02 8.28E+02 0.00E+00 8.81 E-01 8.81 E-01 0.1598 5.51 8.00E+03 6.67E+01 6.76E+02 9.56E+02 0.00E+00 1.02E+00 1.02E+00 0.1598 6.36 1.00E+04 8.33E+01 7.56E+02 1.07E+03 0.00E+00 1.14E+00 1.14E+00 0.1598 7.12 1.20E+04 1.00E+02 8.28E+02 1.17E+03 0.00E+00 1.25E+00 1.25E+00 0.1598 7.80 1.40E+04 1.17E+02 8.94E+02 1.26E+03 0.00E+00 1.35E+00 1.35E+00 0.1598 8.42 1.80E+04 1.50E+02 1.01 E+03 1.43E+03 0.00E+00 1.53E+00 1.53E+00 0.1598 9.55 2.00E+04 1.67E+02 1.07E+03 1.51 E+03 0.00E+00 1.61 E+00 1.61 E+00 0.1598 10.06 4.00E+04 3.33E+02 1.51 E+03 2.14E+03 0.00E+00 2.27E+00 2.27E+00 0.1598 14.23 6.00E+04 5.00E+02 1.85E+03 2.62E+03 0.00E+00 2.79E+00 2.79E+00 0.1598 17.43 8.00E+04 6.67E+02 2.14E+03 3.02E+03 0.00E+00 3.22E+00 3.22E+00 0.1598 20.13 1.00E+05 8.33E+02 2.39E+03 3.38E+03 0.00E+00 3.60E+00 3.60E+00 0.1598 22.50

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FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 41 of 48 Soil Scan MDC For Ludlum 44-10 Nal Detector 95% Cs-137, 5% Co-60 1.0 pCi/g d' =1.38 Scan Speed 0.5 m/s Detector end-cap 2.0" above Soil Surface @ Detector Centerline (7.62 cm)

Detectable Detectable uR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co-60 Cs-137 cpm second MDCR MDCRsurveyor UR/h UR/h Total uR/h @ 7.62 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 5.56E-02 4.83E-01 5.39E-01 0.3033 1.8 2.00E+03 3.33E+01 4.78E+02 6.76E+02 7.86E-02 6.83E-01 7.62E-01 0.3033 2.51 4.00E+03 6.67E+01 6.76E+02 9.56E+02 1.11E-01 9.66E-01 1.08E+00 0.3033 3.55 6.00E+03 1.00E+02 8.28E+02 1.17E+03 1.36E-01 1.18E+00 1.32E+00 0.3033 4.35 8.00E+03 1.33E+02 9.56E+02 1.35E+03 1.57E-01 1.37E+00 1.52E+00 0.3033 5.02 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 1.76E-01 1.53E+00 1.70E+00 0.3033 5.62 1.20E+04 2.00E+02 1.17E+03 1.66E+03 1.93E-01 1.67E+00 1.87E+00 0.3033 6.15 1.40E+04 2.33E+02 1.26E+03 1.79E+03 2.08E-01 1.81 E+00 2.02E+00 0.3033 6.65 1.80E+04 3.00E+02 1.43E+03 2.03E+03 2.36E-01 2.05E+00 2.29E+00 0.3033 7.54 2.00E+04 3.33E+02 1.51 E+03 2.14E+03 2.49E-01 2.16E+00 2.41 E+00 0.3033 7.94 4.00E+04 6.67E+02 2.14E+03 3.02E+03 3.52E-01 3.06E+00 3.41 E+00 0.3033 11.23 6.00E+04 1.00E+03 2.62E+03 3.70E+03 4.31 E-01 3.74E+00 4.17E+00 0.3033 13.76 8.00E+04 1.33E+03 3.02E+03 4.28E+03 4.97E-01 4.32E+00 4.82E+00 0.3033 15.89 1.00E+05 1.67E+03 3.38E+03 4.78E+03 5.56E-01 4.83E+00 5.39E+00 0.3033 17.76 Cs-137 95% Co-60 5% Scan Speed 0.5 m/s MDC (in pCi/g) as a Function of Background 34 0 32.0 30.0 5.0" IUIII BIKl- ;ap 28.0 K

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4.0 2.0 0.0 0.0E +00 2.0E +04 4.0E +04 6.0E+04 8.0E+04 1.0E +05 1Sack gro jnd cpm

FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 42 of 48 Soil Scan MDC For Ludlum 44-10 Nal Detector 95% Cs-137, 5% Co-60 1.0 pCi/g d' =1.38 Scan Speed 0.5 m/s Detector end-cap 3.0" above Soil Surface @ Detector Centerline (10.16 i:m)

Detectable Detectable UR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co-60 Cs-137 cpm second MDCR MDCKsutveyor (iR/h uR/h Total uR/h @10.16 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 5.56E-02 4.83E-01 5.39E-01 0.2544 2.1 2.00E+03 3.33E+01 4.78E+02 6.76E+02 7.86E-02 6.83E-01 7.62E-01 0.2544 2.99 4.00E+03 6.67E+01 6.76E+02 9.56E+02 1.11 E-01 9.66E-01 1.08E+00 0.2544 4.24 6.00E+03 1.00E+02 8.28E+02 1.17E+03 1.36E-01 1.18E+00 1.32E+00 0.2544 5.19 8.00E+03 1.33E+02 9.56E+02 1.35E+03 1.57E-01 1.37E+00 1.52E+00 0.2544 5.99 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 1.76E-01 1.53E+00 1.70E+00 0.2544 6.70 1.20E+04 2.00E+02 1.17E+03 1.66E+03 1.93E-01 1.67E+00 1.87E+00 0.2544 7.34 1.40E+04 2.33E+02 1.26E+03 1.79E+03 2.08E-01 1.81 E+00 2.02E+00 0.2544 7.92 1.80E+04 3.00E+02 1.43E+03 2.03E+03 2.36E-01 2.05E+00 2.29E+00 0.2544 8.98 2.00E+04 3.33E+02 1.51 E+03 2.14E+03 2.49E-01 2.16E+00 2.41 E+00 0.2544 9.47 4.00E+04 6.67E+02 2.14E+03 3.02E+03 3.52E-01 3.06E+00 3.41 E+00 0.2544 13.39 6.00E+04 1.00E+03 2.62E+03 3.70E+03 4.31 E-01 3.74E+00 4.17E+00 0.2544 16.40 8.00E+04 1.33E+03 3.02E+03 4.28E+03 4.97E-01 4.32E+00 4.82E+00 0.2544 18.94 1.00E+05 1.67E+03 3.38E+03 4.78E+03 5.56E-01 4.83E+00 5.39E+00 0.2544 21.18 Soil Scan MDC For Ludlum 44-10 Nal Detector 95% Cs-137, 5% Co-60 1.0 pCi/g d" =1.38 Scan Speed 0.5 m/s Detector end-cap 5.0" above Soil Surface @ Detector Centerline (15.24 i:m)

Detectable Detectable uR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co-60 Cs-137 cpm second MDCR MDCKsutveyor UR/h uR/h Total uR/h @ 15.24 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 5.56E-02 4.83E-01 5.39E-01 0.1843 2.9 2.00E+03 3.33E+01 4.78E+02 6.76E+02 7.86E-02 6.83E-01 7.62E-01 0.1843 4.13 4.00E+03 6.67E+01 6.76E+02 9.56E+02 1.11 E-01 9.66E-01 1.08E+00 0.1843 5.85 6.00E+03 1.00E+02 8.28E+02 1.17E+03 1.36E-01 1.18E+00 1.32E+00 0.1843 7.16 8.00E+03 1.33E+02 9.56E+02 1.35E+03 1.57E-01 1.37E+00 1.52E+00 0.1843 8.27 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 1.76E-01 1.53E+00 1.70E+00 0.1843 9.24 1.20E+04 2.00E+02 1.17E+03 1.66E+03 1.93E-01 1.67E+00 1.87E+00 0.1843 10.13 1.40E+04 2.33E+02 1.26E+03 1.79E+03 2.08E-01 1.81 E+00 2.02E+00 0.1843 10.94 1.80E+04 3.00E+02 1.43E+03 2.03E+03 2.36E-01 2.05E+00 2.29E+00 0.1843 12.40 2.00E+04 3.33E+02 1.51 E+03 2.14E+03 2.49E-01 2.16E+00 2.41 E+00 0.1843 13.07 4.00E+04 6.67E+02 2.14E+03 3.02E+03 3.52E-01 3.06E+00 3.41 E+00 0.1843 18.49 6.00E+04 1.00E+03 2.62E+03 3.70E+03 4.31 E-01 3.74E+00 4.17E+00 0.1843 22.64 8.00E+04 1.33E+03 3.02E+03 4.28E+03 4.97E-01 4.32E+00 4.82E+00 0.1843 26.14 1.00E+05 1.67E+03 3.38E+03 4.78E+03 5.56E-01 4.83E+00 5.39E+00 0.1843 29.23

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FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 43 of 48 Soil Scan MDC For Ludlum 44-10 Nal Detector 90% Cs-137,10% Co-60 1.0 pCi/g d' = 1.38 Scan Speed 0.5 m/s Detector end-cap 2.0" above Soil Surface @ Detector Centerline (7.62 cm)

Detectable Detectable UR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co-60 Cs-137 cpm second MDCR MDCKsurveyor UR/h uR/h Total uR/h @ 7.62 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11E-01 4.58E-01 5.69E-01 0.3437 1.7 2.00E+03 3.33E+01 4.78E+02 6.76E+02 1.57E-01 6.47E-01 8.05E-01 0.3437 2.34 4.00E+03 6.67E+01 6.76E+02 9.56E+02 2.22E-01 9.15E-01 1.14E+00 0.3437 3.31 6.00E+03 1.00E+02 8.28E+02 1.17E+03 2.72E-01 1.12E+00 1.39E+00 0.3437 4.05 8.00E+03 1.33E+02 9.56E+02 1.35E+03 3.14E-01 1.29E+00 1.61 E+00 0.3437 4.68 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 3.52E-01 1.45E+00 1.80E+00 0.3437 5.23 1.20E+04 2.00E+02 1.17E+03 1.66E+03 3.85E-01 1.59E+00 1.97E+00 0.3437 5.73 1.40E+04 2.33E+02 1.26E+03 1.79E+03 4.16E-01 1.71 E+00 2.13E+00 0.3437 6.19 1.80E+04 3.00E+02 1.43E+03 2.03E+03 4.72E-01 1.94E+00 2.41 E+00 0.3437 7.02 2.00E+04 3.33E+02 1.51 E+03 2.14E+03 4.97E-01 2.05E+00 2.54E+00 0.3437 7.40 4.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E-01 2.89E+00 3.60E+00 0.3437 10.47 6.00E+04 1.00E+03 2.62E+03 3.70E+03 8.61 E-01 3.55E+00 4.41 E+00 0.3437 12.82 8.00E+04 1.33E+03 3.02E+03 4.28E+03 9.94E-01 4.09E+00 5.09E+00 0.3437 14.80 1.00E+05 1.67E+03 3.38E+03 4.78E+03 1.11 E+00 4.58E+00 5.69E+00 0.3437 16.55 Cs-137 90% Co-60 10% Scan Speed 0.5 m/s MDC (in pCi/g) as a Function of Background frem-end I.0E+00 2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+05 Background cpm

$*y FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 44 of 48 Soil Scan MDC For Ludlum 44-10 Nal Detector 90% Cs-137, 10% Co-60 1.0 pCi/g d' = 1.38 Scan Speed 0.5 m/s Detector end-cap 3.0" above Soil Surface @ Detector Centerline (10.16 <:m)

Detectable Detectable uR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co-60 Cs-137 cpm second MDCR MDCRsurVeyot UR/h UR/h Total jiR/h @ 10.16 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11 E-01 4.58E-01 5.69E-01 0.2883 2.0 2.00E+03 3.33E+01 4.78E+02 6.76E+02 1.57E-01 6.47E-01 8.05E-01 0.2883 2.79 4.00E+03 6.67E+01 6.76E+02 9.56E+02 2.22E-01 9.15E-01 1.14E+00 0.2883 3.95 6.00E+03 1.00E+02 8.28E+02 1.17E+03 2.72E-01 1.12E+00 1.39E+00 0.2883 4.83 8.00E+03 1.33E+02 9.56E+02 1.35E+03 3.14E-01 1.29E+00 1.61 E+00 0.2883 5.58 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 3.52E-01 1.45E+00 1.80E+00 0.2883 6.24 1.20E+04 2.00E+02 1.17E+03 1.66E+03 3.85E-01 1.59E+00 1.97E+00 0.2883 6.84 1.40E+04 2.33E+02 1.26E+03 1.79E+03 4.16E-01 1.71 E+00 2.13E+00 0.2883 7.38 1.80E+04 3.00E+02 1.43E+03 2.03E+03 4.72E-01 1.94E+00 2.41 E+00 0.2883 8.37 2.00E+04 3.33E+02 1.51 E+03 2.14E+03 4.97E-01 2.05E+00 2.54E+00 0.2883 8.82 4.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E-01 2.89E+00 3.60E+00 0.2883 12.48 6.00E+04 1.00E+03 2.62E+03 3.70E+03 8.61 E-01 3.55E+00 4.41 E+00 0.2883 15.28 8.00E+04 1.33E+03 3.02E+03 4.28E+03 9.94E-01 4.09E+00 5.09E+00 0.2883 17.65 1.00E+05 1.67E+03 3.38E+03 4.78E+03 1.11 E+00 4.58E+00 5.69E+00 0.2883 19.73 Soil Scan MDC For Ludlum 44-10 Nal Detector 90% Cs-137,10% Co-60 1.0 pCi/g d' = 1.38 Scan Speed 0.5 m/s Detector end-cap 5.0" above Soil Surface @ Detector Centerline (15.24cm)

Detectable Detectable uR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co-60 Cs-137 cpm second MDCR M Ut>> KSUTVeyor (iR/h UR/h Total uR/h @ 15.24 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11E-01 4.58E-01 5.69E-01 0.2087 2.7 2.00E+03 3.33E+01 4.78E+02 6.76E+02 1.57E-01 6.47E-01 8.05E-01 0.2087 3.85 4.00E+03 6.67E+01 6.76E+02 9.56E+02 2.22E-01 9.15E-01 1.14E+00 0.2087 5.45 6.00E+03 1.00E+02 8.28E+02 1.17E+03 2.72E-01 1.12E+00 1.39E+00 0.2087 6.68 8.00E+03 1.33E+02 9.56E+02 1.35E+03 3.14E-01 1.29E+00 1.61 E+00 0.2087 7.71 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 3.52E-01 1.45E+00 1.80E+00 0.2087 8.62 1.20E+04 2.00E+02 1.17E+03 1.66E+03 3.85E-01 1.59E+00 1.97E+00 0.2087 9.44 1.40E+04 2.33E+02 1.26E+03 1.79E+03 4.16E-01 1.71 E+00 2.13E+00 0.2087 10.20 1.80E+04 3.00E+02 1.43E+03 2.03E+03 4.72E-01 1.94E+00 2.41 E+00 0.2087 11.56 2.00E+04 3.33E+02 1.51 E+03 2.14E+03 4.97E-01 2.05E+00 2.54E+00 0.2087 12.19 4.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E-01 2.89E+00 3.60E+00 0.2087 17.24 6.00E+04 1.00E+03 2.62E+03 3.70E+03 8.61 E-01 3.55E+00 4.41 E+00 0.2087 21.11 8.00E+04 1.33E+03 3.02E+03 4.28E+03 9.94E-01 4.09E+00 5.09E+00 0.2087 24.38 1 00E+05 1.67E+03 3.38E+03 4.78E+03 1.11E+00 4.58E+00 5.69E+00 0.2087 27.26

^ I B I H a L ^ ^ ****>>

FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 45 of 48 Soil Scan MDC For Ludlum 44-10 Nal Detector 90% Cs-137 , 10% Co-60 1.0 pCi/g d' = 1.38 Scan Speed 0.25 m/s Detector end-cap 2.0" above Soil Surface @ Detector Centerline (7.62 cm)

Detectable Detectable uR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 0.5 Co-60 Cs-137 cpm second MDCR MDCRsurveyor UR/h uR/h Total uR/h @ 7.62 cm pCi/g 1.00E+03 8.33E+00 2.39E+02 3.38E+02 7.86E-02 3.24E-01 4.02E-01 0.3437 1.2 2.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11 E-01 4.58E-01 5.69E-01 0.3437 1.66 4.00E+03 3.33E+01 4.78E+02 6.76E+02 1.57E-01 6.47E-01 8.05E-01 0.3437 2.34 8.00E+03 6.67E+01 6.76E+02 9.56E+02 2.22E-01 9.15E-01 1.14E+00 0.3437 3.31 1 .OOE+04 8.33E+01 7.56E+02 1.07E+03 2.49E-01 1.02E+00 1.27E+00 0.3437 3.70 1.20E+04 1.00E+02 8.28E+02 1.17E+03 2.72E-01 1.12E+00 1.39E+00 0.3437 4.05 1.40E+04 1.17E+02 8.94E+02 1.26E+03 2.94E-01 1.21 E+00 1.51E+00 0.3437 4.38 1.80E+04 1.50E+02 1.01 E+03 1.43E+03 3.34E-01 1.37E+00 1.71E+00 0.3437 4.97 2.00E+04 1.67E+02 1.07E+03 1.51 E+03 3.52E-01 1.45E+00 1.80E+00 0.3437 5.23 4.00E+04 3.33E+02 1.51 E+03 2.14E+03 4.97E-01 2.05E+00 2.54E+00 0.3437 7.40 6.00E+04 5.00E+02 1.85E+03 2.62E+03 6.09E-01 2.51 E+00 3.12E+00 0.3437 9.07 8.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E-01 2.89E+00 3.60E+00 0.3437 10.47 1.00E+05 8.33E+02 2.39E+03 3.38E+03 7.86E-01 3.24E+00 4.02E+00 0.3437 11.70 Cs-137 90% Co-60 10% Scan Speed 0.25 MDC (in pCi/g) as a Function of Background 20.0 18.0 5 ttWr. >m e nd-c f*-"--

=

16.0 14.0 12.0 cm --"

C u 10.0 Q. 3.C "fro n erv J-cai i 8.0 6.0

^0 2.i 1"fro nen d-ca 3 4.0 2.0 0.0 0.0E+00 2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+05 Background cpm

riffr UHHU Omaha Public Power District FC-19-006 Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 46 of 48 Soil Scan MDC For Ludlum 44 10 Nal Detector 90% Cs-137,10% Co-60 1.0 pCi/g d' = 1 38 Scan Speed 0.25 m/s Detector end-cap 3.0" above Soil Surface @ Detector Centerline (10.16 cm)

Detectable Detectable UR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 0.5 Co-60 Cs-137 cpm second MDCR MDCRsurveyor uR/h UR/h Total uR/h @ 10.16 cm pCi/g 1.00E+03 8.33E+00 2.39E+02 3.38E+02 7.86E-02 3.24E-01 4.02E-01 0.2883 1.4 2.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11E-01 4.58E-01 5.69E-01 0.2883 1.97 4.00E+03 3.33E+01 4.78E+02 6.76E+02 1.57E-01 6.47E-01 8.05E-01 0.2883 2.79 8.00E+03 6.67E+01 6.76E+02 9.56E+02 2.22E-01 9.15E-01 1.14E+00 0.2883 3.95 1.00E+04 8.33E+01 7.56E+02 1.07E+03 2.49E-01 1.02E+00 1.27E+00 0.2883 4.41 1.20E+04 1.00E+02 8.28E+02 1.17E+03 2.72E-01 1.12E+00 1.39E+00 0.2883 4.83 1.40E+04 1.17E+02 8.94E+02 1.26E+03 2.94E-01 1.21 E+00 1.51 E+00 0.2883 5.22 1.80E+04 1.50E+02 1.01 E+03 1.43E+03 3.34E-01 1.37E+00 1.71 E+00 0.2883 5.92 2.00E+04 1.67E+02 1.07E+03 1.51 E+03 3.52E-01 1.45E+00 1.80E+00 0.2883 6.24 4.00E+04 3.33E+02 1.51 E+03 2.14E+03 4.97E-01 2.05E+00 2.54E+00 0.2883 8.82 6.00E+04 5.00E+02 1.85E+03 2.62E+03 6.09E-01 2.51E+00 3.12E+00 0.2883 10.81 8.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E-01 2.89E+00 3.60E+00 0.2883 12.48 1.00E+05 8.33E+02 2.39E+03 3.38E+03 7.86E-01 3.24E+00 4.02E+00 0.2883 13.95 Soil Scan MDC For Ludlum 44-10 Nal Detector 90% Cs-137,10% Co-60 1.0 pCi/g d1= 1.38 Detector end-cap 5.0" above Soil Surface @ Detector Centerline (15.24 cm) Scan Speed 0.25 m/s Detectable Detectable uR/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uR/h Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 0.5 Co-60 Cs-137 cpm second MDCR MDCRBurvey0r UR/h UR/h Total uR/h @ 15.24 cm pCi/g 1.00E+03 8.33E+00 2.39E+02 3.38E+02 7.86E-02 3.24E-01 4.02E-01 0.2087 1.9 2.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11 E-01 4.58E-01 5.69E-01 0.2087 2.73 4.00E+03 3.33E+01 4.78E+02 6.76E+02 1.57E-01 6.47E-01 8.05E-01 0.2087 3.85 8.00E+03 6.67E+01 6.76E+02 9.56E+02 2.22E-01 9.15E-01 1.14E+00 0.2087 5.45 1.00E+04 8.33E+01 7.56E+02 1.07E+03 2.49E-01 1.02E+00 1.27E+00 0.2087 6.10 1.20E+04 1.00E+02 8.28E+02 1.17E+03 2.72E-01 1.12E+00 1.39E+00 0.2087 6.68 1.40E+04 1.17E+02 8.94E+02 1.26E+03 2.94E-01 1.21 E+00 1.51 E+00 0.2087 7.21 1.80E+04 1.50E+02 1.01 E+03 1.43E+03 3.34E-01 1.37E+00 1.71 E+00 0.2087 8.18 2.00E+04 1.67E+02 1.07E+03 1.51 E+03 3.52E-01 1.45E+00 1.80E+00 0.2087 8.62 4.00E+04 3.33E+02 1.51 E+03 2.14E+03 4.97E-01 2.05E+00 2.54E+00 0.2087 12.19 6.00E+04 5.00E+02 1.85E+03 2.62E+03 6.09E-01 2.51 E+00 3.12E+00 0.2087 14.93 8.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E-01 2.89E+00 3.60E+00 0.2087 17.24 1.00E+05 8.33E+02 2.39E+03 3.38E+03 7.86E-01 3.24E+00 4.02E+00 0.2087 19.27

<ti$r FC-19-006 Omaha Public Power District Revision 0 Ludlum Model 44-10 Detector Sensitivity Page 47 of 48 Attachment 8.4 Scan MDC Formulas and pCi/g Determination Example The Nal scan MDC utilizes the same formulas and approach as that found in NUREG -1507, Section 6.8.2 and NUREG-1575, Section 6.7 for open land areas. The following formula parameters are provided:

Scan speed: 0.25 and 0.5 m/s Area of Interest: 50 cm diameter (0.196 m2) results in a scan width of 0.5 m Soil Depth: 6.0 inches (15.24 cm)

Soil Density: 1.6 g/cm3 Soil Composition: Sand (Si02 Si = 46.74%, O = 53.26%)

Background Count Rate 6.0E+03 cpm Surveyor Efficiency: 0.5 Detector Response (Co-60): 430 cpm/iaR/h (See Table 1.0 and Attachment 8.1)

Detector Response (Cs-137) 940 cpm/laR/h (See Table 1.0 and Attachment 8.1)

Index of Sensitivity (d'): 1.38 MDCR: Minimum Detectable Count Rate (cpm)

MicroShield iaR/h/pCi/g: For varying distances and radionuclide mix (See Table below)

MicroShield' uR/h/pCi/g Values Nuclide Nuclide Detector Distance Nuclide Nuclide Fraction Fraction to end cap Fraction Fraction Cs-137 95% Cs-137 90%

Inches (cm) Cs-137 100% Co-60 100%

Co-60 5% Co-60 10%

2.0 (5.08) 0.3033 0.3437 0.2628 1.0720 3.0 (7.62) 0.2544 0.2883 0.2206 0.8975 4.0(10.16) 0.2156 0.2442 0.1869 0.7593 5.0(12.7) 0.1843 0.2087 0.1598 0.6485 To determine the MDC the MDCR must be calculated by first determining the minimum detectable number of net source counts in the interval as given by si.

st = d'JFi The value of d' is selected from Table 6.5 of NUREG-1575 based on the required true positive and false positive rates and bt is the number of background counts in the interval. For a background count rate of 6.0E+03 cpm and a scan area of interest 50 cm diameter, a scan rate of 0.5 m/s (resulting in a detector residence time of 1 second) then st (MDCR) is 8.28E+02 cpm as determined below:

DPRff FC-19-006 Omaha Public Power District ReVJSJOn 0 Ludlum Model 44-10 Detector Sensitivity Page 48 of 48 0.5 m scan width v 1s counts (6.00£ + 03 cpm) -t- = 100 = bt cmnrntt, 0.5scan rate An 60 interval 5 m 60 s/m 1.38V100 = 13.8 counts f- Is

= 828 cpm = MDCR = st The MDCR is adjusted using the surveyor efficiency (MDCRsurveyor) using the following formula:

MDCR M ULKsurveyor r Where, p is the surveyor efficiency (0.5).

828 cpm

-= = 1,171 cpm = MDCRsurveyor The MDCRsurveyor result is divided by the detector response factor for the radionuclide(s) in order to obtain -p This illustration assumes 100% Cs-137 and the detector response factor is 940 cpm uR/h 1.171E + 03 cpm cpm = 1.246 uR/h

WuR/h MicroShield' runs were performed using the physical and survey parameters provided in this attachment to derive the ^ conversion factors relative to nuclide mixture and detector end pCi/g cap distance from the soil surface. The Table in this attachment lists the conversion factors for a mixture of 100% Cs-137 at different soil to detector distances. For a soil surface distance of 5 inches to the detector end cap the conversion factor is 0.1598. Based on the above derived uR/h value of 1.246 the MDC for a detector background of 6,000 cpm is 7.8 pCi/g.

1-246^ pCi

= 7.796 = MDC 0.1598-^pCi/g 9 .3 illustrates the Ludlum Model 44-10 MDC (in pCi/g) for different background values and mixtures of Co-60 and Cs-137.

ML21271A212

Contents

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2.0 BACKGROUND

5.0 CONCLUSION

7.0 REFERENCES

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ML21271A212

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2.0 BACKGROUND

5.0 CONCLUSION

7.0 REFERENCES

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