ML19007A044

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RS-TD-313196-006 - Ludlum Model 44-10 Detector Sensitivity Rev 0
ML19007A044
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RS-TD-313196-006 Revision 0 Page 2 of 49 Summary of Changes in this Revision:

Revision 0 - Initial Issuance

RS-TD-313196-006 Revision 0 Page 3 of 49 Ludlum Model 44-10 Detector Sensitivity 1.0 Executive Summary This Technical Support Document evaluates the sensitivity of the Ludlum Model 44-10 2.0 x 2.0 (5.08 x 5.08 cm) NaI 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.

2.0 Introduction The calculations exemplify the MARSSIM based determination for Minimum Detectable Concentration (MDC) for land areas. There are two principle objectives.

The first objective is to qualify the response of the vendors NaI detector to Cs-137 and Co-60 sources based on a study performed at a previous reactor decommissioning.

The second is to identify detectable residual soil concentrations for Co-60 and Cs-137 radionuclides at the La Cross Boiling Water Reactor (LACBWR) 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.

3.0 Table of Contents 1.0 Executive Summary....................................................................................................................... 3 2.0 Introduction.................................................................................................................................... 3 3.0 Table of Contents........................................................................................................................... 3 4.0 Background.................................................................................................................................... 3 4.1 Limitations..................................................................................................................................... 4 4.2 Response Factor............................................................................................................................. 4 5.0 Model for Determination of NaI Detector Soil MDC................................................................... 5 6.0 Soil Radionuclide Distribution...................................................................................................... 5 7.0 MicroShield' Code Runs and Derived MDC Values.................................................................. 5 7.1 Observations and Results............................................................................................................... 6 7.2 Survey Techniques......................................................................................................................... 6 8.0 Attachments................................................................................................................................... 7 8.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results............................... 7 8.2 MicroShield' Code Runs for Various Distances and Nuclide Fractions..................................... 7 8.3 Scan MDC (pCi/g) for Various Nuclide Fractions of Co-60 and Cs-137..................................... 8 8.4 Scan MDC Formula and pCi/g Determination Example............................................................... 8 9.0 References...................................................................................................................................... 8 4.0 Backgrou nd Published sensitivity for the Ludlum 44-10 detector is listed in the manufacturers literature as 900 cpm/R/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 NaI detector as 430 and 900 cpm/R/hr, respectively. A study was performed (See Section 4.2) at the Rancho Seco Nuclear

RS-TD-313196-006 Revision 0 Page 4 of 49 Generating Station (RSNGS) to confirm the manufacturers literature. The values derived from the study will be used in this TSD as they were derived empirically.

4.1 Limitations The conclusions of this TSD are limited to (2 x 2) 5.08 by 5.08 cm NaI detectors.

4.2 Response Factor 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 the detector size and the distance from the source face to the detector centerline (located at 2.54 cm beyond the detector 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 NaI Response Factors for Ludlum Model 44-10 Detector Source to Detector Distance (cm)

Microshield Derived R/h 44-10 (5.08 x 5.08 cm)

CPM/R/h 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 NaI detector is 941.0 cpm/R/h.

The value is consistent with the results found in NUREG-1575 Table 6.7. The average Co-60 value for the 44-10 NaI detector is 433 cpm/R/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 NaI detectors response will be greater for the lower energy gammas resulting from the scattering processes associated with the nuclides being distributed in soil media.

RS-TD-313196-006 Revision 0 Page 5 of 49 5.0 Model for Determination of NaI Detector Soil MDC 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 LACBWR indicate construction grade soils consisting primarily of loamy clay, sand and gravels that are of similar density values. The NaI 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 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 NaI 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.

6.0 Soil Radionuclide Distribution 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 TSD 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.

7.0 MicroShield' Code Runs and Derived MDC Values 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.

RS-TD-313196-006 Revision 0 Page 6 of 49 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.

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 Detector Distance**

Inches (cm)

Nuclide Fraction Cs-137 95%

Co-60 5%

Nuclide Fraction Cs-137 90%

Co-60 10%

Nuclide Fraction Cs-137 100%

Nuclide Fraction Co-60 100%

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 7.1 Observations and Results 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. This radionuclide distribution is also applicable to LACBWR. Site characterization data will be continually assessed and used to update the soil or structure radionuclide mixture MDC and action levels.

7.2 Survey Techniques 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

RS-TD-313196-006 Revision 0 Page 7 of 49 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 surveyors efficiency for detecting areas of elevated activity.

Table 3.0 Ludlum 44-10 Detector MDC (pCi/g)*

(Cs-137 Nuclide Fraction 1.0)

Detector Distance**

Inches (cm)

Scan Speed 0.5 m/s Scan Speed 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 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 R/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 R/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)

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

RS-TD-313196-006 Revision 0 Page 8 of 49 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 9.0 References 9.1 Decommissioning Technical Basis Document DTBD-05-012 V-0, 11/7/05 (Evaluation of Eberline SPA-3 and Ludlum 44-10 cpm per R/h Response Factors Robert F. Decker, August 19, 2004), Rancho Seco Nuclear Generating Station 9.2 NUREG-1575 Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) Rev. 1 August 2000.

9.3 NUREG-1757 V2 Rev 1.0 Consolidated Decommissioning Guidance:

Characterization, Surveys and Determination of Radiological Criteria September 2006.

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

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results RS-TD-313196-006 Revision 0 Page 9 of 49 Evaluation of Eberline SPA-3 and Ludlum 44-10 cpm per R/h Response Factors August 19, 2004 RFD The NaI 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 Ci 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)

NaI Response Factors for SPA-3 and 44-10 Detectors Distance (cm)

Derived R/h SPA-3 Estimate SPA-3 Observed 44-10 Estimated 44-10 Observed 7.62 24.12 1.447E+04 cpm 9.3217E+03 cpm 1.0372E+04 cpm 9.8920E+03 cpm 15.24 6.032 3.619E+03 cpm 2.7440E+03 cpm 2.5938E+03 cpm 2.3361E+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/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.

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results RS-TD-313196-006 Revision 0 Page 10 of 49

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results RS-TD-313196-006 Revision 0 Page 11 of 49

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results RS-TD-313196-006 Revision 0 Page 12 of 49

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results RS-TD-313196-006 Revision 0 Page 13 of 49

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results RS-TD-313196-006 Revision 0 Page 14 of 49 Evaluation of Eberline SPA-3 and Ludlum 44-10 cpm per R/h Response Factors August 19, 2004 RFD The NaI detector s provided by Eberline and Ludlum include cpm per R/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 Ci) on 10/1/03. Decay corrected is 337.1 kBq (9.111 Ci) on 8/18/04 MicroShield' runs attached fro point source at 15.24, 30.48 and 60.96 cm (6,12 & 24 inches to centerline of detector active area.

NaI Response Factors for SPA-3 and 44-10 Detectors Distance (cm)

Derived R/h SPA-3 Estimate SPA-3 Observed 44-10 Estimate 44-10 Observed 15.24 128.1 1.537E+05 1.3642E+05 1.153E+05 1.228E+05 30.48 32

.01 3.841E+04 4.361E+04 2.881E+04 4.143E+04 60.96 8.

001 9.601E+03 9.601E+03 7.201E+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 th e detector and source elev ated 1.0 meter above the surface. Walls and oth er 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 instrum ent and the m easurement (count) time is 10.0 minutes.

Background is evaluated by perform ing a 10 m inute 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 r esponse to Cs-13 7 the net counts per m inute are divided by the R/h provided for the specific distance.

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results RS-TD-313196-006 Revision 0 Page 15 of 49

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results RS-TD-313196-006 Revision 0 Page 16 of 49

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results RS-TD-313196-006 Revision 0 Page 17 of 49

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results RS-TD-313196-006 Revision 0 Page 18 of 49

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results RS-TD-313196-006 Revision 0 Page 19 of 49

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results RS-TD-313196-006 Revision 0 Page 20 of 49

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results RS-TD-313196-006 Revision 0 Page 21 of 49

.2 MicroShield' Code Runs RS-TD-313196-006 Revision 0 Page 22 of 49 MicroShield 8.03 EnergySolutions (8.03-0000)

Date By Checked 12/2/2011 R. F. Decker Filename Run Date Run Time Duration Case1 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 A

X Y

Z

  1. 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

µCi/cm³ Bq/cm³ Co-60 4.7878e-008 1.7715e+003 1.6000e-006 5.9200e-002 Buildup: The material reference is Source Integration Parameters Radial 20 Circumferential 10 Y Direction (axial) 10 Results Energy (MeV) Activity (Photons/sec)

Fluence Rate MeV/cm²/sec No Buildup Fluence Rate MeV/cm²/sec With Buildup Exposure Rate mR/hr No Buildup Exposure Rate mR/hr With Buildup This image cannot currently be displayed.

.2 MicroShield' Code Runs RS-TD-313196-006 Revision 0 Page 23 of 49 0.6938 2.890e-01 1.824e-05 3.278e-05 3.521e-08 6.329e-08 1.1732 1.771e+03 2.224e-01 3.441e-01 3.974e-04 6.150e-04 1.3325 1.771e+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 (1 of 5)

(20.32 cm) 0.6938 2.890e-01 1.824e-05 3.278e-05 3.521e-08 6.329e-08 1.1732 1.771e+03 2.224e-01 3.441e-01 3.974e-04 6.150e-04 1.3325 1.771e+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 1.771e+03 1.873e-01 2.846e-01 3.347e-04 5.086e-04 1.3325 1.771e+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 1.771e+03 1.588e-01 2.383e-01 2.838e-04 4.259e-04 1.3325 1.771e+03 1.868e-01 2.718e-01 3.241e-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 1.771e+03 1.356e-01 2.017e-01 2.422e-04 3.604e-04 1.3325 1.771e+03 1.593e-01 2.299e-01 2.764e-04 3.988e-04 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 1.771e+03 1.165e-01 1.723e-01 2.081e-04 3.079e-04 1.3325 1.771e+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 Sensitivity Analysis Summary - Y Dose Point 1 Dose Point # Sensitivity Sensitivity Dimension Fluence Rate MeV/cm²/sec Fluence Rate MeV/cm²/sec Exposure Rate mR/hr Exposure Rate mR/hr

.2 MicroShield' Code Runs RS-TD-313196-006 Revision 0 Page 24 of 49 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 MicroShield 8.03 EnergySolutions (8.03-0000)

Date By Checked 12/2/2011 Robert F. Decker

.2 MicroShield' Code Runs RS-TD-313196-006 Revision 0 Page 25 of 49 Filename Run Date Run Time Duration Case1 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 A

X Y

Z

  1. 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

µCi/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 Circumferential 10

.2 MicroShield' Code Runs RS-TD-313196-006 Revision 0 Page 26 of 49 Y Direction (axial) 10 Results Energy (MeV) Activity (Photons/sec)

Fluence Rate MeV/cm²/sec No Buildup Fluence Rate MeV/cm²/sec With Buildup Exposure Rate mR/hr No Buildup Exposure Rate mR/hr With Buildup 0.0045 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 6.401e+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 1.508e+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 (1 of 5)

(20.32 cm) 0.0045 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 6.401e+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 1.508e+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 (2 of 5)

(22.86 cm) 0.0045 1.740e+01 6.603e-08 6.801e-08 4.526e-08 4.662e-08 0.0318 3.469e+01 8.221e-06 1.014e-05 6.848e-08 8.448e-08 0.0322 6.401e+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 1.471e-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 3.971e-08 4.089e-08 0.0318 3.469e+01 7.200e-06 8.880e-06 5.997e-08 7.397e-08 0.0322 6.401e+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 Totals 1.647e+03 6.470e-02 1.137e-01 1.256e-04 2.206e-04

.2 MicroShield' Code Runs RS-TD-313196-006 Revision 0 Page 27 of 49 Sensitivity 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 6.401e+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 6.401e+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 Summary - Y Dose Point 1 Dose Point # Sensitivity Sensitivity Dimension Fluence Rate MeV/cm²/sec No Buildup Fluence Rate MeV/cm²/sec With Buildup Exposure Rate mR/hr No Buildup Exposure Rate mR/hr With Buildup 1

(1 of 5)

(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 MicroShield 8.03 EnergySolutions (8.03-0000)

Date By Checked 12/2/2011 Robert F. Decker Filename Run Date Run Time Duration

.2 MicroShield' Code Runs RS-TD-313196-006 Revision 0 Page 28 of 49 Case1 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. 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

µCi/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 Circumferential 10 Y Direction (axial) 10 Results Energy (MeV) Activity (Photons/sec)

Fluence Rate MeV/cm²/sec No Buildup Fluence Rate MeV/cm²/sec With Buildup Exposure Rate mR/hr No Buildup Exposure Rate mR/hr With Buildup 0.0045 1.653e+01 7.107e-08 7.323e-08 4.871e-08 5.020e-08 0.0318 3.296e+01 8.871e-06 1.095e-05 7.389e-08 9.119e-08 0.0322 6.081e+01 1.707e-05 2.121e-05 1.374e-07 1.707e-07

.2 MicroShield' Code Runs RS-TD-313196-006 Revision 0 Page 29 of 49 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 (1 of 5)

(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 6.081e+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 6.081e+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 6.341e-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 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 6.081e+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

.2 MicroShield' Code Runs RS-TD-313196-006 Revision 0 Page 30 of 49 0.6938 1.445e-02 6.589e-07 1.141e-06 1.272e-09 2.203e-09 1.1732 8.857e+01 7.941e-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 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 Dose Point # Sensitivity Sensitivity Dimension Fluence Rate MeV/cm²/sec No Buildup Fluence Rate MeV/cm²/sec With Buildup Exposure Rate mR/hr No Buildup Exposure Rate mR/hr With Buildup 1

(1 of 5)

(20.32 cm) 1.092e-01 1.919e-01 2.076e-04 3.656e-04 1

(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 1

(4 of 5)

(27.94 cm) 6.739e-02 1.131e-01 1.282e-04 2.156e-04 1

(5 of 5)

(30.48 cm) 5.801e-02 9.667e-02 1.103e-04 1.843e-04

.2 MicroShield' Code Runs RS-TD-313196-006 Revision 0 Page 31 of 49 MicroShield 8.03 EnergySolutions (8.03-0000)

Date By Checked 12/2/2011 Robert F. Decker Filename Run Date Run Time Duration Case1 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 8 - Cylinder Volume - End Shields

.2 MicroShield' Code Runs RS-TD-313196-006 Revision 0 Page 32 of 49 Source Dimensions Height 15.24 cm (6.0 in)

Radius 25.0 cm (9.8 in)

Dose Points A

X Y

Z

  1. 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

µCi/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 Radial 20 Circumferential 10 Y Direction (axial) 10 Results Energy (MeV) Activity (Photons/sec)

Fluence Rate MeV/cm²/sec No Buildup Fluence Rate MeV/cm²/sec With Buildup Exposure Rate mR/hr No Buildup Exposure Rate mR/hr 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 5.761e+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 3.441e-02 3.974e-05 6.150e-05 1.3325 1.771e+02 2.623e-02 3.929e-02 4.550e-05 6.816e-05

.2 MicroShield' Code Runs RS-TD-313196-006 Revision 0 Page 33 of 49 Totals 1.837e+03 1.290e-01 2.206e-01 2.416e-04 4.146e-04 Sensitivity Variable Y Dose Point 1 (1 of 5)

(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 5.761e+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 3.441e-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 5.761e+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 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 1.566e+01 5.214e-08 5.369e-08 3.574e-08 3.680e-08 0.0318 3.123e+01 6.480e-06 7.992e-06 5.398e-08 6.657e-08 0.0322 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 1.357e+03 5.821e-02 1.023e-01 1.128e-04 1.982e-04 0.6938 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 1.3325 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)

.2 MicroShield' Code Runs RS-TD-313196-006 Revision 0 Page 34 of 49 0.0045 1.566e+01 4.559e-08 4.694e-08 3.125e-08 3.218e-08 0.0318 3.123e+01 5.661e-06 6.981e-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 2.096e+01 6.047e-06 8.065e-06 3.436e-08 4.582e-08 0.6616 1.357e+03 4.986e-02 8.666e-02 9.666e-05 1.680e-04 0.6938 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 0.0318 3.123e+01 4.944e-06 6.096e-06 4.118e-08 5.078e-08 0.0322 5.761e+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 1.1732 1.771e+02 1.165e-02 1.723e-02 2.081e-05 3.079e-05 1.3325 1.771e+02 1.368e-02 1.963e-02 2.373e-05 3.406e-05 Totals 1.837e+03 6.829e-02 1.110e-01 1.280e-04 2.087e-04 Sensitivity Analysis Summary - Y Dose Point 1 Dose Point # Sensitivity Sensitivity Dimension Fluence Rate MeV/cm²/sec No Buildup Fluence Rate MeV/cm²/sec With Buildup Exposure Rate mR/hr No Buildup Exposure Rate mR/hr With Buildup 1

(1 of 5)

(20.32 cm) 1.290e-01 2.206e-01 2.416e-04 4.146e-04 1

(2 of 5)

(22.86 cm) 1.091e-01 1.828e-01 2.044e-04 3.437e-04 1

(3 of 5)

(25.4 cm) 9.280e-02 1.533e-01 1.739e-04 2.883e-04 1

(4 of 5)

(27.94 cm) 7.937e-02 1.298e-01 1.487e-04 2.442e-04 1

(5 of 5)

(30.48 cm) 6.829e-02 1.110e-01 1.280e-04 2.087e-04

.2 MicroShield' Code Runs RS-TD-313196-006 Revision 0 Page 35 of 49

.3 Scan MDC for Various Nuclide Fractions of Co-60 and Cs-137 RS-TD-313196-006 Revision 0 Page 36 of 49 Soil Scan MDC For Ludlum 44-10 NaI 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 Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

=>

430 940 Exp. Rate Results Scan MDC cpm 1.0 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/h

@ 7.62 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11E+00 0.00E+00 1.11E+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 1.51E+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 1.51E+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 8.61E+00 0.00E+00 8.61E+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

0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 0.0E+00 2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+05 pCi/g Background(cpm)

Co60100%ScanSpeed0.5m/s MDC(inpCi/g)asaFunctionofBackground 2.0" from end-cap 3.0" from end-cap 5.0" from end-cap

.3 Scan MDC for Various Nuclide Fractions of Co-60 and Cs-137 RS-TD-313196-006 Revision 0 Page 37 of 49 Soil Scan MDC For Ludlum 44-10 NaI 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 @ Detector Centerline (10.16cm)

Detectable Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

=>

430 940 Exp. Rate Results Scan MDC cpm 1.0 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 1.51E+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 8.61E+00 0.00E+00 8.61E+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 1.11E+01 0.00E+00 1.11E+01 0.8975 12.39 Soil Scan MDC For Ludlum 44-10 NaI 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 Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

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430 940 Exp. Rate Results Scan MDC cpm 1.0 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/h

@ 15.24 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11E+00 0.00E+00 1.11E+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 1.51E+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 8.61E+00 0.00E+00 8.61E+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 1.11E+01 0.6485 17.14

.3 Scan MDC for Various Nuclide Fractions of Co-60 and Cs-137 RS-TD-313196-006 Revision 0 Page 38 of 49 Soil Scan MDC For Ludlum 44-10 NaI 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 Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

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430 940 Exp. Rate Results Scan MDC cpm 1.0 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 0.00E+00 1.44E+00 1.44E+00 0.2628 5.47 1.00E+04 1.67E+02 1.07E+03 1.51E+03 0.00E+00 1.61E+00 1.61E+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

0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 28.0 30.0 32.0 0.0E+00 2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+05 pCi/g Backgroundcpm Cs137100%ScanSpeed0.5m/s MDC(inpCi/g)asaFunctionofBackground 2.0" from end-cap 3.0" from end-cap 5.0" from end-cap

.3 Scan MDC for Various Nuclide Fractions of Co-60 and Cs-137 RS-TD-313196-006 Revision 0 Page 39 of 49 Soil Scan MDC For Ludlum 44-10 NaI 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 Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

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430 940 Exp. Rate Results Scan MDC cpm 1.0 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 1.61E+00 1.61E+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+00 2.16E+00 2.16E+00 0.2206 9.78 2.00E+04 3.33E+02 1.51E+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 NaI Detector 100% Cs-137 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 cm)

Detectable Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

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430 940 Exp. Rate Results Scan MDC cpm 1.0 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 0.00E+00 1.44E+00 1.44E+00 0.1598 9.00 1.00E+04 1.67E+02 1.07E+03 1.51E+03 0.00E+00 1.61E+00 1.61E+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 1.51E+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

.3 Scan MDC for Various Nuclide Fractions of Co-60 and Cs-137 RS-TD-313196-006 Revision 0 Page 40 of 49 Soil Scan MDC For Ludlum 44-10 NaI 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 Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

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430 940 Exp. Rate Results Scan MDC cpm 0.5 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 8.81E-01 8.81E-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 1.01E+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 0.00E+00 1.61E+00 1.61E+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

0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 0.0E+00 2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+05 pCi/g Backgroundcpm Cs137100%ScanSpeed0.25m/s MDC(inpCi/g)asaFunctionofBackground 2.0" from end-cap 3.0" from end-cap 5.0" from end-cap

.3 Scan MDC for Various Nuclide Fractions of Co-60 and Cs-137 RS-TD-313196-006 Revision 0 Page 41 of 49 Soil Scan MDC For Ludlum 44-10 NaI Detector 100% Cs-137 1.0 pCi/g Scan Rate = 0.25 m/s d' = 1.38 Detector end-cap 3.0" above Soil Surface @ Detector Centerline (10.16cm)

Detectable Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

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430 940 Exp. Rate Results Scan MDC cpm 0.5 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 8.81E-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 1.01E+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 1.61E+00 1.61E+00 0.2206 7.29 4.00E+04 3.33E+02 1.51E+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 NaI 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 Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

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430 940 Exp. Rate Results Scan MDC cpm 0.5 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 8.81E-01 8.81E-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 1.01E+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 1.51E+03 0.00E+00 1.61E+00 1.61E+00 0.1598 10.06 4.00E+04 3.33E+02 1.51E+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

.3 Scan MDC for Various Nuclide Fractions of Co-60 and Cs-137 RS-TD-313196-006 Revision 0 Page 42 of 49 Soil Scan MDC For Ludlum 44-10 NaI 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 Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

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430 940 Exp. Rate Results Scan MDC cpm 1.0 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 1.51E+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 1.81E+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 1.51E+03 2.14E+03 2.49E-01 2.16E+00 2.41E+00 0.3033 7.94 4.00E+04 6.67E+02 2.14E+03 3.02E+03 3.52E-01 3.06E+00 3.41E+00 0.3033 11.23 6.00E+04 1.00E+03 2.62E+03 3.70E+03 4.31E-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

0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 28.0 30.0 32.0 34.0 0.0E+00 2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+05 pCi/g Backgroundcpm Cs13795%Co605%ScanSpeed0.5m/s MDC(inpCi/g)asaFunctionofBackground 2.0" from end-cap 3.0" from end-cap 5.0" from end-cap

.3 Scan MDC for Various Nuclide Fractions of Co-60 and Cs-137 RS-TD-313196-006 Revision 0 Page 43 of 49 Soil Scan MDC For Ludlum 44-10 NaI 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 cm)

Detectable Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

=>

430 940 Exp. Rate Results Scan MDC cpm 1.0 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 1.11E-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 1.51E+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 1.81E+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 1.51E+03 2.14E+03 2.49E-01 2.16E+00 2.41E+00 0.2544 9.47 4.00E+04 6.67E+02 2.14E+03 3.02E+03 3.52E-01 3.06E+00 3.41E+00 0.2544 13.39 6.00E+04 1.00E+03 2.62E+03 3.70E+03 4.31E-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 NaI 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 cm)

Detectable Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

=>

430 940 Exp. Rate Results Scan MDC cpm 1.0 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 1.11E-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 1.51E+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 1.81E+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 1.51E+03 2.14E+03 2.49E-01 2.16E+00 2.41E+00 0.1843 13.07 4.00E+04 6.67E+02 2.14E+03 3.02E+03 3.52E-01 3.06E+00 3.41E+00 0.1843 18.49 6.00E+04 1.00E+03 2.62E+03 3.70E+03 4.31E-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

.3 Scan MDC for Various Nuclide Fractions of Co-60 and Cs-137 RS-TD-313196-006 Revision 0 Page 44 of 49 Soil Scan MDC For Ludlum 44-10 NaI 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 Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

=>

430 940 Exp. Rate Results Scan MDC cpm 1.0 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 1.61E+00 0.3437 4.68 1.00E+04 1.67E+02 1.07E+03 1.51E+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 1.71E+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 2.41E+00 0.3437 7.02 2.00E+04 3.33E+02 1.51E+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 8.61E-01 3.55E+00 4.41E+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 1.11E+00 4.58E+00 5.69E+00 0.3437 16.55

0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 28.0 0.0E+00 2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+05 pCi/g Backgroundcpm Cs13790%Co6010%ScanSpeed0.5m/s MDC(inpCi/g)asaFunctionofBackground 2.0" from end-cap 3.0" from end-cap 5.0" from end-cap

.3 Scan MDC for Various Nuclide Fractions of Co-60 and Cs-137 RS-TD-313196-006 Revision 0 Page 45 of 49 Soil Scan MDC For Ludlum 44-10 NaI 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 cm)

Detectable Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

=>

430 940 Exp. Rate Results Scan MDC cpm 1.0 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/h

@ 10.16 cm pCi/g 1.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11E-01 4.58E-01 5.69E-01 0.2883 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 1.61E+00 0.2883 5.58 1.00E+04 1.67E+02 1.07E+03 1.51E+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 1.71E+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 2.41E+00 0.2883 8.37 2.00E+04 3.33E+02 1.51E+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 8.61E-01 3.55E+00 4.41E+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 1.11E+00 4.58E+00 5.69E+00 0.2883 19.73 Soil Scan MDC For Ludlum 44-10 NaI 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 Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

=>

430 940 Exp. Rate Results Scan MDC cpm 1.0 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 1.61E+00 0.2087 7.71 1.00E+04 1.67E+02 1.07E+03 1.51E+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 1.71E+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 2.41E+00 0.2087 11.56 2.00E+04 3.33E+02 1.51E+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 8.61E-01 3.55E+00 4.41E+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

.3 Scan MDC for Various Nuclide Fractions of Co-60 and Cs-137 RS-TD-313196-006 Revision 0 Page 46 of 49 Soil Scan MDC For Ludlum 44-10 NaI 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 Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

=>

430 940 Exp. Rate Results Scan MDC cpm 0.5 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 1.11E-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 1.00E+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 1.21E+00 1.51E+00 0.3437 4.38 1.80E+04 1.50E+02 1.01E+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 1.51E+03 3.52E-01 1.45E+00 1.80E+00 0.3437 5.23 4.00E+04 3.33E+02 1.51E+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 2.51E+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

0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 0.0E+00 2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+05 pCi/g Backgroundcpm Cs13790%Co6010%ScanSpeed0.25 MDC(inpCi/g)asaFunctionofBackground 2.0" from end-cap 3.0" from end-cap 5.0" from end-cap

.3 Scan MDC for Various Nuclide Fractions of Co-60 and Cs-137 RS-TD-313196-006 Revision 0 Page 47 of 49 Soil Scan MDC For Ludlum 44-10 NaI 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 Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

=>

430 940 Exp. Rate Results Scan MDC cpm 0.5 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 1.21E+00 1.51E+00 0.2883 5.22 1.80E+04 1.50E+02 1.01E+03 1.43E+03 3.34E-01 1.37E+00 1.71E+00 0.2883 5.92 2.00E+04 1.67E+02 1.07E+03 1.51E+03 3.52E-01 1.45E+00 1.80E+00 0.2883 6.24 4.00E+04 3.33E+02 1.51E+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 NaI Detector 90% Cs-137, 10% Co-60 1.0 pCi/g d' = 1.38 Detector end-cap 5.0" above Soil Surface @ Detector Centerline (15.24 cm) Scan Speed 0.25 m/s Detectable Detec table R/h/pCi/g 12/8/2011 Exp. Rate Exp. Rate Detectable Microshield 44-10 Bkg Counts per cpm/uR/h

=>

430 940 Exp. Rate Results Scan MDC cpm 0.5 second MDCR MDCRsurveyor Co-60 R/h Cs-137 R/h Total R/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 1.11E-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 1.21E+00 1.51E+00 0.2087 7.21 1.80E+04 1.50E+02 1.01E+03 1.43E+03 3.34E-01 1.37E+00 1.71E+00 0.2087 8.18 2.00E+04 1.67E+02 1.07E+03 1.51E+03 3.52E-01 1.45E+00 1.80E+00 0.2087 8.62 4.00E+04 3.33E+02 1.51E+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 2.51E+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

.4 Scan MDC Formulas and pCi/g Determination Example RS-TD-313196-006 Revision 0 Page 48 of 49 The NaI 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 (SiO2 Si = 46.74%, O = 53.26%)

Background Count Rate:

6.0E+03 cpm Surveyor Efficiency:

0.5 Detector Response (Co-60): 430 cpm/R/h (See Table 1.0 and Attachment 8.1)

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

Index of Sensitivity (d):

1.38 MDCR:

Minimum Detectable Count Rate (cpm)

MicroShield R/h/pCi/g:

For varying distances and radionuclide mix (See Table below)

MicroShield' R/h/pCi/g Values Detector Distance to end cap Inches (cm)

Nuclide Fraction Cs-137 95%

Co-60 5%

Nuclide Fraction Cs-137 90%

Co-60 10%

Nuclide Fraction Cs-137 100%

Nuclide Fraction Co-60 100%

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.

The value of is selected from Table 6.5 of NUREG-1575 based on the required true positive and false positive rates and 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 (MDCR) is 8.28E+02 cpm as determined below:

0.5 0.5 6.0003 1 60

100 1.38100 13.8 60 /

1 828

.4 Scan MDC Formulas and pCi/g Determination Example RS-TD-313196-006 Revision 0 Page 49 of 49 The MDCR is adjusted using the surveyor efficiency (MDCRsurveyor) using the following formula:

Where, is the surveyor efficiency (0.5).

828 0.5 1,171 The result is divided by the detector response factor for the radionuclide(s) in order to obtain

. This illustration assumes 100% Cs-137 and the detector response factor is 940

/.

1.17103 940

/

1.246 /

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 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 / value of 1.246 the MDC for a detector background of 6,000 cpm is 7.8 /.

1.246

0.1598 /

/

7.796

.3 illustrates the Ludlum Model 44-10 MDC (in /) for different background values and mixtures of Co-60 and Cs-137.

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