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TSD-11-004, Rev. 0 - Ludlum Model 44-10 Detector Sensitivity
	ML17129A319
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Site:	Zion File:ZionSolutions icon.png
Issue date:	12/12/2011
From:	Decker R; ZionSolutions
To:	; Office of Nuclear Reactor Regulation
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ZionSo/utions, Inc. ZIONSOLUTIONSu.c EH&S Technical Support Document TSD # 11-004 Ludlum Model 44-10 Detector Sensitivity Revision 0 Prepared By: ~~&fu'~6-=

Robert Dec , LTP Engineer, ZionSolutions Date: 12. 1l"Z-/

1 l(

Reviewed By:

~ Date: /J;(Z/;(

I.:z-/,G'1f(

Approved By:

Stev~ ~ilic~cePFe Date:

r/

Reviewed By: ~~.

R:CSeellediatiOtiollManager, ZionSolutions Date:

I 4~J1/~tl- I I Approved By: Date: z/2frdZ-J

's Baker ice President, Environmental Health and Safety, ZionSolutions

EH&S TSD # 11-004 Revision 00 Page 2 of48 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) 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.

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 Nal 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 Zion Station Restoration Project (ZSRP) 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.

3.0 Table of Contents 1.0 Executive Summary ........................ .............................................................................................. 2 2.0 Introduction ................................................................................................................................... 2 3.0 Table of Contents ............................................................... ........................................................... 2 4.0 Background ................................................................................................................................... 2 4.1 Limitations ..................................................................................................................................... 3 4.2 Response Factor ............................................... ............................................................................. 3 5.0 Model for Determination ofNaI Detector Soil MDC ................................................................... 4 6.0 Soil Radionuclide Distribution ............................................................................ .......................... 4 7.0 MicroShield' Code Runs and Derived MDC Values .................................................................. 4 7.1 Observations and Results .............................................................................................................. 5 7.2 Survey Techniques ........................................................................................................................ 5 8.0 Attachments ................................................................................................................................... 6 8.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results ............................... 6 8.2 MicroShield' Code Runs for Various Distances and Nuclide Fractions .................................... 6 8.3 Scan MDC (PCi/g) for Various Nuclide Fractions ofCo-60 and Cs-137 ..................................... 7 8.4 Scan MDC Fonnula and pCi/g Determination Example............................................................... 7 9.0 References ..................................................................................................................................... 7 4.0 Background Published sensitivity for the Ludlum 44-10 detector is listed in the manufacturer's literature as 900 cpm/fLRlhr for Cs-137. Table 6.70f NUREG-1575 lists the Co-60 and Cs-137 sensitivity for a 5.08 by 5.08 em Nal detector as 430 and 900 cpm/fLRlhr,

EH&S TSD # 11-004 Revision 00 Page 3 of 48 respectively. A study was performed (See Section 4 .2) 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 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 Nal 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-SO 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).

,,, }:al ~~

CeJ'.lW'line PMT The evaluation process to determine detector response factors for Cs-137 and Co-SO are provided in Attachment 8.1. The results are presented in Table 1.0 below.

Table 1.0 NIR -

a esponse Fact ors ~or L u dl um Mo d e144 100etector Microshield'" 44-10 (5.08 x 5.08 cm)

Source to Detector Derived J.LRlh CPM/J.LRlh Distance (cm)

Co-60 Cs*137 C0-60 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/l-lR/h.

The value is consistent with the results found in NUREG-1575 Table S.7. The average Co-SO value for the 44-10 Nal detector is 433 cpm/l-lRlh. 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-SO 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.

EH&S TSD # 11-004 Revision 00 Page 4 of 48 5.0 Model for Determination of Nal Detector Soil MOe The MARSSIM suggested scan speed of 0.5 m/s is used with the elevated (soil) area of interest being 0.196 m that relates to contaminants in a 50 cm diameter region that 2

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/cm 3 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 ZSRP 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 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 MOC 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 MOC 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 MOC 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 MOC values provided in this TSO 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.

EH&S TSD # 11-004 Revision 00 Page 5 of4B 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 S;peed 05m1 = . S Nuclide Nuclide Fraction Nuclide Nuclide Detector Distance" Fraction Cs-13790% Fraction Fraction Inches (cm) Cs-13795%

Co-60 10% Cs-137100% Co-60 100%

Co-60 5%

2.0 (5.0B) 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.B 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. An initial nuclide fraction of 0.9 and 0.1 for Cs-137 and Co-60 will be used for site characterization and ISFSI surveys at ZSRP. Site characterization data will be continually assessed and used to update the sailor structure radionuclide mixture MDC and action levels.

7.2 Survey Techniques Detector background during land scanning operations is expected to range between 4.0oE+03 and 6.ooE+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

EH&S TSD # 11-004 Revision 00 Page 6 of 48 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.

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

(Cs-137 Nuclide Fraction 1.0)

Detector Distance** Scan Speed Scan Speed Inches (em) 0.5 mls 0.25 mls 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.

- oistance from detector encl..c;ap 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.uRlh 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 .uRlh 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 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.

EH&S TSD # 11-004 Revision 00 Page 7 0148 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-O, 1117105 (Evaluation of Eberline SPA-3 and Ludlum 44-10 cpm per .uRlh 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

Attachment 8.1 EH&S TSD # 11-004 Co-SO and Cs-137 Response Factor Determination Revision 00 Page 8 of 48 Instructions and Results Evaluation of Eberline SPA-3 and Ludlum 44-10 cpm per ,R/h Response Factors August 19, 2004 RFD The Nal detectors provided by Eberline and Ludlum include cpm per ,RIh 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 ,uCi

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 ,uCi on 8-1-88. Decay corrected activity is 3.995 kBq (0.108 ,uCi) 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-l Observed 44-10 Estimated 44-10 Observed (cm) pRlh 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 2.3361 E+03 cpm 30.48 1.508 9.048E+02 cpm 6.8530E+01 com 6.4844E+02 com 7.5780E+02 cpm Estimates based on vendor value of 600 and 430 com/uR/h for SPA-3 and 44-10, respectivelv.

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 1O-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 .uR/h provided for the specific distance.

Attachment 8.1 EH&S TSD # 11-004 Co-60 and Cs-137 Response Factor Determination Revision 00 Page 9 0148 Instructions and Results MicroShleld v5.05 (5.0S"()0488)

Sacramento Municipal Uitility District Page :1 File Ref: _ _ __

DOS File: Casel Date: _ _ __

RUII De.*~: August 24, 2004 By:

'<un Time: 7:45:23 AM Checked: - - - -

Duraibn : OO:CO:OO Case

Title:

Co-60

Description:

Nal Response Check @ 7.62 cm Geometry: 3 - Disk

_-------x Source Dimensions Ii

1 Radius

~

7.62 em 0.238 em Dose Points

r:

Oem V.I in

?.

Oem 3.0 in 0.0 in 0.0 in Shields Shield Name Material Densi.\y Air Gap Air 0.00122 Source Input Grouping Method: Actual Photon Energies Nuclid.~ curies !;>ecgu~rels ~j,'g!!f Bglcm' Co-60 *. 0797e-007 3.9950e+003 6.0931e-OOI 2.2544e+004 Buildup The material reference is : Air Gap Integration Parameters Radial 20 Circumferential 20 Results Ene:*ay Activity Fluence Bl!t~ Fluence Rate Ex~osure Rate Ex~osure Rate MeV ~hotons/sec MeV/cm'/sec MeVlcm'/sec mRlhr mR/hr No Buildu~ With Buildu~ No Buildu~ With Buiidl!Q 0.6938 6.517e-Ol 6.18ge-04 6.193e-04 1.195e-06 1.196e-06 1.1732 3.995e+03 6.417e+00 6.41ge+00 1.147e-02 1.147e-02 1.3325 3.995e+03 7.288e+00 7.291e+00 1.264e-02 1.265e-02 TOTALS: 7.991e+03 1.371e+Ol 1.371e+Ol 2.411e-02 2.412e-02

Attachment 8.1 EH&S TSD # 11-004 Co-60 and Cs-137 Response Factor Determination Revision 00 Instructions and Results Page 10 of 48 MicroShield v5.05 (5.05.00488)

Sacramento Municipal Uitility District Page 1 File Ref: .. __

_ .._ .* _

DOS File: Casel Oate: _ __

Run Date : lIugust 24. 2004 By:

Run Time ' 7:47:04 AM Checked: _ _ __

Dur!'.t;on : 00:00:00 Case

Title:

Co-60

Description:

Nal Response Check @ 15.24 cm Geometry: 3

Disk

~-- ..

1 Radius Source Dimensions

~

15.24 em 6.0 in 0.238 em Dose Points y.

0 em 0.0 in 0.1 in l

Oem 0.0 in Shields Shield Name Materjal Densitv Air Gap Air 0.00122 Source Input Grouping Method: Actual Photon Energies

!:!.uelide curieJ> beeguarel. oCi/em' Bg/cm' co-se 1.0797e-007 3.9950a+003 6.0931e-00l 2.2544e+004 Buildup The material reference is : Air Gap Integration Parameters Radial 20 Circumterentia~ 20 Results Energy Activity Fluence Rate Fluen~ Rate EXQosure Rate EXQQsure Rate Mr~1I. ghotons/sec MeV/em'/see MeV/em'/see mRlhr mRlhr No Bujlgug With Buildup No Buildup With Buildup 0.6938 6.517e-Ol 1.547e-04 1.54ge-04 2.986e-07 2.990e-07 1.1732 3.995e+03 1.604e+00 1.605e+00 2.866e-03 2.86ge-03 1.3325 3.995e+03 1.822e+00 1.823e+00 3.161e-03 3.163e-03 TOTALS: 7.991e+03 3.426e+00 3.42ge+00 6.027e-03 6.032e-03

Attachment 8.1 EH&S TSD # 11-004 Co-60 and Cs-137 Response Factor Determination Revision 00 Page 11 of 48 Instructions and Results MicroShield v5.05 (5.05.00488)

Sacramento Municipal Ultllity District Pag3 :1 File Ref: ._ _ _ _

DOS File: Case1 Date: _ _ __

Run Date: August 24, 2004 By:

Rcn Tim!'!: 7:48:15 AM Checked: - - - -

Duration : 00:00:00 Case

Title:

Co-SO

Description:

Nal Response Check @ 30.48 cm Geometry: 3 - Disk Source Dimensions l,....-._--_ --

'f

-- _ _ _x

1 Radius

~

30.48 em 1 ft 0.238 em Dose Points

't 0 ern 0.0 in 0.1 in l

Oem 0.0 in Shields Shield Name Material Density Air Gap Air 0.00122 Source Input Grouping Method: Actual Photon Energies Nuclide curies pec.querels uCVem' Bg/em' 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 Energy Activity FI~ence Rate Fluence Rate EXIlosure Rate EXQQsure Rate MeV Ilhotons/see MeV/cm'/see MeV/em'/see mR/hr mR/hr No BuilguIl With BuilduIl No Build~12 With BuilduIl 0.6938 6.517e-01 3.862e-05 3.871e-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: 7.991e+03 8.557e-Ol 8.570e-01 1.505e.o3 1.508e-03

Attachment 8.1 EH&S TSD # 11-004 Revision 00 Co-SO and Cs-137 Response Factor Determination Page 12 of 48 Instructions and Results

\_ . 8/,1/83 ~

i CER11F1CATE OF I i

GAMMA STANDARD SOURCE !

Radlonucllde: Go -cO Half*llfe: S. 2714 .;. Q. avO =:; ..-

r.'-,n.

8 .. ".,

C;Jstomer: ...... +/-_ *ron .***" -r.- ~H

.c..Qy.(,;:,*~e..tcl!;??t.!rIot:".I.*

......c 0 ................. _

. P.O. No.: .........30,,.'009

P

,~_. _ _

Catalog No.: G:-::£,] Source No.:214-17-~95Reference Date: At'U. 1. ~.98e Contained Radioactivity: ____ ) .89 1

, uCi O.scrlptlon of Source _

a. Capsule type: .J =.

b. Nature of active dep.0sit; ,,'iAPORATED MEr~LL!C SALTS _ _ _ _

d. Backing:

c. Active

e. Cover:

d~~a~m~e~~ir:~_=~C~.~}~E~7="===============

N A N A R,dlolmpuritle.

NO!iE DETE8T!:D Method of Calibration X ) The source was assayed by gamma spectrometry, Integrating under the 1.173 & 1.112 Mev peak(s). The branching rallo(s) used was/were 1..0 &:: 1.0 gamma rays per decay.

) The source was preparad from a weight aliquot of solution whose activity in uCI/gram wasdetermlned by the melhod above.

Uncertainty of Measurement

a. Sy-stematic uncertainty in instrument calibration: +/- !. .1 %

b. Random uncertainly

1. In assay: +/- _ ::. .1 I %

2. In welghlng(s): +/- *.. %

c. Total Uncertainty: +/- 2,4 % at the 99 0(0 confidence level.

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

Not **

1. Nucl~ar data were taken from **Table of Isotopes", Seventh Edition, edited by C. Michael Lederer et al.

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

Quality Control ISOTOPE PROOUCTS LABORATORIES 1800 No. Keystone St., Burbank, California 91504 (818) 843*7000 i==~=-=_=================================~

Attachment 8.1 EH&S TSD # 11-004 Co-SO and Cs-137 Response Factor Determination Revision 00 Page 13 of 48 Instructions and Results Evaluation of Eberline SPA-3 and Ludlum 44-10 cpm per)lR/h Response Factors August 19, 2004 RFD The Nal detector s provided by Eberline and Ludlum include cpm per ~j response factors for specific nuclides. The instructions below are used to evaluate the response of both detectors to Cs-13 7.

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 /-LCi) on 10/1/03. Decay corrected is 337.1 kBq (9.111/-LCi) 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.

NaIResponse F act on £or SPA 3 an d 44 10 D et ect ors Distance (em) Derived IIRIb 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 3.84IE+04 4.36IE+04 2.88IE+04 4.143E+04 60.96 8.001 9.60IE+03 9.60IE+03 7.20IE+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 /-LRih provided for the specific distance.

Attachment 8.1 EH&S TSD # 11-004 Co-60 and Cs-137 Response Factor Determination Revision 00 Instructions and Results Page 14 of 48 MicroShield v5.05 (5.05*00488)

Sacramento Municipal Uitllity District

'age :1 File Ref: _ _ __

)OS File: Case1 Oate: _ _ __

~un Date : August 17, 2004 By:

~un Time: 11 :31:58 AM Checked: - - - -

)umtior, : C~:OO:OO Case

Title:

9.11 uCI Cs*137

Description:

Point Source at 15.24 cm Geometry: 1 - Point

_ _ _- x 2S Dose Points y l 15.24 em 0 cm Ocm

--- - - - - - #1 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 bccguerels Ba-137m 8.6188e-006 3. 1890e+005 Cs-137 9.1108e-006 3.3710e+005 Buildup The material reference is : Air Gap Results "nsrgy t,ctivity Fluence Rate Fluence Rate EXQosure Rate Exposure Rate MeV ~hotons/sec MeV/cm'/sec MeV/cm'lsec mRlhr mRihl NQ BuilduQ With BuilduQ No BuilduQ With Bu ilduQ 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 1.083a-03 0.0364 4.433e+03 5.502e-02 5.540e-02 3.126e-04 3.147e-04 0.6616 2.86ge+05 6.496e+01 6.504e+01 1.25ge-01 1.261 e-01 TOTALS: 3.102e+05 6.522e+01 6.530e+01 1.27ge-01 1.281 e-01

Attachment 8.1 EH&S TSD # 11-004 Co-60 and Cs-137 Response Factor Determination Revision 00 Page 15 of 48 Instructions and Results MicroShield v5.05 (5.05-00488)

Sacramento Municipal Uitility District

'age :1 File Ref:

lOS File : Case1 Date: =_-=--_-_-__-_-.==_

<un Date: August 17. 2004 By:. _ _ __

,un Time: 11 :29:10 AM Checked:

Juration : 00:00:00 Case

Title:

9.11 uCi Cs-137

Description:

Point Source at 30.48 cm Geometry: 1

Point

---------------' #1

~

Dose Points 30.48 cm 1ft Shields y.

0 cm G.Oin

?:

Oem 0.0 in Shield Name Material Density Air Gap Air 0.00122 Source Input Grouping Method: Actual Photon Energies Nuclide curies becquerels Ba-137m 8.6~88e*006 3.1890e+005 Cs-137 9.11086-006 3.3710e+005 Buildup The material reference is : Air Gap Results Energy Activity Fluence Rate Fluence Rate fOxQosure Rate Exposure Rate MeV Rhotons/sec MeV/cm'/sec MeVicm'/sec mR/hr mRlhr No BuilduQ \'\11th BuilduQ No BuilduQ With Buildup 0.0318 6.602e+03 1.77ge-02 1.804e-02 1.482e-04 1.503e-04 0.0322 1.218e+04 3.323e-02 3.368e-02 2.674e-04 2.711e-04 0.0364 4.433e+03 1.36ge-02 1.388e-02 7.77ge-05 7.885e-05 0.6616 2.86ge+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 3.201e-02

Attachment 8.1 EH&S TSD # 11-004 Co-60 and Cs-137 Response Factor Determination Revision 00 Instructions and Results Page 16 of 48 MicroShield v5.05 (5.05.00488)

Sacramento Municipal Uitility District

'age :1 File Ref: _ _ __

)05 File: Casel oate: _ _ __

~un Data : August 17. 2004 By:

~un Time: 11 :30:55 AM Checked: - - - -

)",ation : 00:00:00 Case

Title:

9.11 uCi Cs*137

Description:

Point Source at 60.96 cm

__---h Geometry: I* Point Dose Points X y ~

- - -" #1 60.96 em Oem Oem

~

2 ft 0.0 in 0.0 in Shields Shield Name Malerial Density Air Gap Air 0.00122 Source Input Grouping Method: Actual Photon Energies Nuclide curies beeguerels Ba-137m 8.6188e-006 3.1890e+005 Cs-137 9.11080-006 3.3710e+005 I Buildup The material reference is : Air Gap Results Eneruy Activity Fluence Rate Fluence Rate S1gl~Q!llJ!!lB3te ];)gl.9~J3~1\l MeV Qhotons/sec MeV/cm'/sec MeV/cm'/sec mRlhr mRlhr No BuilduQ With BuilduQ No BuilduQ With BuilduQ 0.0318 6.602e+03 4.39ge-03 4.521e-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 3.391e-03 3.484e-03 1.926e-05 1.980e-05 0.6616 2.86ge+05 4.042e+00 4.062e+00 7.837e-03 7.875e-03 TOTALS: 3.102e+05 4.058e+00 4.07ge+00 7.95ge-03 8.001e-03

Attachment 8.1 EH&S TSD # 11 -004 Co-SO and Cs-137 Response Factor Determination Revision 00 Page 17of4B Instructions and Results

- c~:f+ 'It 0'3-0 ... 7 461.1sJuc., 03-01-03 AEA Technology QSAGmbH Gia:i". I

]8110 BraW\Sdlwcia CERTIFiCATE PoItracld137 J800IBraUIIJchwdi No. 68970 - LY 376 c_

Ttl +..~ (0) Sl07 932-1) for a Sealed Radioactive Source Fn .... ~(OjS307932*I94 17~ 2003 Source Type: Reference Sourc.

Product code CDRX1476 Drawing VZ-47712 Source no. LY37S Nuclide Caeslr.:m*137 Measurement Data Activity 344 kBq Uncertainty* 3%

Reference dr.e 1 Oclober 2003 TraceabiliV Defined on page 2 Radioactive impunlies Relate~ to Cs-137 (eqLsl 100 %) the following radioactive impurities were detected: Cs-134 < 0.1 %

Leakage and Contamination Testis Test method/s* Band I Testis pass<< on 16 September 2003 Additionallnfonnation 150_* C.34313 AEA Technology QSA GmbH

Attachment 8.1 EH&S TSD # 11-004 Revision 00 Co-60 and Cs-137 Response Factor Determination Page 18 of 48 Instructions and Results

"?,.... c .... rt.,.t. 03 - 0 ~7 Explanations for Certificates (Page 2 of CertifiCates)

Uncertainty

'The reported uncertainty iI AEA TetimOlogy QSA GmbH ThIs ptIX!ua com;1les v.ilt: ttllI based on standard' uncertaiJiy has been aocrediled as DKD reQUimnanls for tmce=~

multiplied by. ~o ~c:Ior (o.LMdIer Kalibrl8ldier-o NlST specified In tha k

2, providing a level of Ciallibration laboral:oiy by Ille Ndcml Slamwd "Traceabllity confidence of appruximattty Physblisch.-Technisc:tle Bu~ of Rlldioactiv1t Sources to the 95 %. {JSOGuide, 1995) daanalt (PTB) and

NIST and Associated Instru-Mltllorized to issue reference IMnI: auaity Co_nlml (ANSI aourc:es whIch are traceable 1D N42.22*1995)-,

ndonal .anliards held .: the As

requlremem for the ANSI PTa In Gamany. N42.22*1995 AEA Technology 811~ of the European cg.. QSA parUdpellls In the NEIINIST Measuranonb

~ mutual ~ Assurn::e f'ro.g:ram fA the oIio_"""""

Nuclei. Powet htuWy*

lMI1'Iburs Ie, g. NAMAS, UK).

leakage and contamln.tion tests Strin!l8nt tests fur I " . are an essanliar featU1'8 of radiolctlve 'OUreM production. They 1m! based on ISO 11'"8. Som., Wlndan::!

methods used for testing radiation sources are rliled below.

Wipe lest I Immersion test II Bubble test III

!:b :utir:.:. :t!:'~

_anol or water. the actMly The aource is lmmlrucl In I au/table liquid at 50 *C for at lust " hcln and the actiYIy The source 1& immersed in

....r Of

suitable liquid lind thl ptNIure In the "..e' remavec:lls meuured. rernoo;ed Is meamed. f'IIduc:.d to 13 kPa (100 mm linIit:200Sq UrnIt UIS Bq Hell. No butIbIes mull til (LImIt USA: 5 nCI) ob........

lSO classifICation The II'ItemationaI ~ for Standardizlllkln (ISOt IIaI Pf090Md

I)'StlIm of ctnsJlic:ltIon !If IeIIIId radiD8CIive sources based on aafely requirements lor typrk:aI us. (lIN ISO 2919). This l,slam ptOIIidH I manufacturer Of sailed ractiDldiI.e IOUrces will I Nt of tests to evaluate the NhAY of his prodLJds. It also assists I us. of aueh lealed IOUrceS to IBlect twes which IU!t.1he appncation he hal in mind. The testa to WhICfi .pecilnllIlOutCll 11'9 su~d anr.1iI~ In the foUlM'ing table.

Classification of saaled .ouree performance standard according to ISO 291&

s g peak ImpH*

Special appliCations IAEA SpeeiaJ Form Quality aasurance System NI) tut progratDme can QIMtf 'Spedat Form' 1& a last ~ The quaIiIy assutanee system all possille combinalion5 of cation for sealed IIOurCU ,;,.n tf A£A Technology Qs.-.

errWonmenb to IIIfIII:II

In 1M tAEA transport regu~ GmbH Will certified ~ Uoyd'I 5O.U'Ce may be expo&ad.. tkms (IAEA Safety Seli.. No. ReglJter Quality ASsurance u.ens &hcufd thel9fo:e conluK 6, '985, revised eel/tion). tl..RQA) according to ISO our experts. before using II II wed in dDtermin~ thl ~OO', Issue 1994. Isotnlk 10wceS ir. potentially adVIirsa maximum accePiabilt IctiYltiH ~roducts mel!! the requiM-envltonments. for various types of transport m.nts of 10CFR50 Appen-c:c:mainers. dlxB.

~ 4~ -

JI.I6Q TECHNOLO~

F.El.lssue 3.2003-03-27 ,.IQ<;t;

I _ ;' z

Attachment 8.1 EH&S TSD # 11-004 Co-60 and Cs-137 Response Factor Determination Revision 00 Page 19 of 48 Instructions and Results Co-60 Nal Response Factors for SPA-3 and 44-10 Detectors Gross Data count Net Counts C PMh,R/h in~~nt-- _. ' ~~~~=r~~=-~'-=';'~~=~~;:5Cf!l~:.:~r-=-\9;1~~L~'=~'t .- ..,Average _--=1

. --44=10 - - -, .. - *- -4~tO*-~~-' _ ... __ ___~~.7__ _:::--~!iO~'l :-_~_ --,-=-:,,:- ~; -* *-- l

Attachment 8.1 EH&S TSD # 11-004 Co-60 and Cs-137 Response Factor Determination Revision 00 Page 20 of48 Instructions and Results Cs-137 Nal Response Factors for SPA-3 and 44-10 Detectors Gross Data

_. Instrumei'lI---Y-'SoriaINumbe;-r-Backjlround ! 15.24crn~ : 30~4acm GO&Gcm

. SPA-3---r--' _405Cr~ - _ :___ J..!..4.!?~L.... ~r. ~82101 ____ ~3§§75 :T~**1974~~ .. -=':

4-.;.-10 ! 211672_--L ... __ 11562L___ L

_ 613988 __ .L,__ ._.i142~!L __ ~_

I 19736.§

~ .~ *m/l\\lt~ C\'lUnl r~ll I,.., th.' ti" ( I :S .=:-; Cllii nlCa~'Urcrr*ml dUo: tco hi,!.:!) CI'Un( n;h:

InSli umCIII m~ * .o.:11 OUl \" I ~ , .1lJ)ra::: inJ;lId~ 1...5 minUII:$ 1.1 gil in::l III minute "/J 'In;.

Net Ccunts CPMlf,Rlh

!.flSs.Lpr"-An-3~n.L ___." _.__I :62.9.1 1_..' _'. .~ ?~~.-~- . -l . 30.48 em I Average ._- . - ~

f- 10 - . - "

, 975 :

~.::::_~§!!....::-:~ ~:::~-- 933 -- -,-

1003 I __ l..Q~:! _____ J ___. 1004 " ._1 1022 _" _ _ ._941 _ __ . J

Attachment 8.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 21 of 48 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 em Geometry 8 - Cylinder Volume - End Shields Source Dimensions Height 15.24 em (6.0 in)

Radius 25.0 em (9.8 in)

Dose Points A X y z

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

Shields ShieldN Dimension Material Density Source 2.9ge+04 em' Sand 1.6 Air Gap Air 0.00122 Source Input: Grouping Method - Actual Photon Energies Nuclide Ci Bq /lCi/cm' Bq/cm' 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 Fluence Rate Fluence Rate Exposure Rate Exposure Rate Energy (MeV) Activity (Photons/sec) MeV/cm'/sec MeV/cm'/sec mRlhr mRlhr No BuilliUP .With Buildup No Buildup With Buildup

Attachment 8.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 22 of48 0.6938 2.890e-Ol 1.824e-05 3.278e-05 3.521e-08 6.32ge-08 1.1732 1.771e+03 2.224e-Ol 3,441e-Ol 3.974e-04 6.150e-04 1.3325 1.771e+03 2.623e-Ol 3.92ge-Ol 4.550e-04 6.816e-04 Totals 3.S43e+03 4.847e-Ol 7.370e-Ol 8.S2Se-04 1.297e-03 Sensitivity Variable Y Dose Point 1 (lofS) (20.32 em) 0.6938 2.890e-Ol 1. 824e-05 3.278e-05 3.521e-08 6.32ge-08 1.1732 1.771e+03 2.224e-Ol 3,441e-Ol 3.974e-04 6. 150e-04 1.3325 1.771e+03 2.623e-01 3.92ge-Ol 4.550e-04 6.816e-04 Totals 3.S43e+03 4.847e-Ol 7.370e-Ol 8.S2Se-04 1.297e-03 Sensitivity Variable Y Dose Point 1 (2ofS) (22.86 em) 0.6938 2.890e-Ol 1.547e-05 2.720e-05 2.986e-08 5.251e-08 1.1732 1.771e+03 1.873e-01 2.846e-Ol 3.347e-04 5.086e-04 1.3325 1.771e+03 2.205e-Ol 3.247e-Ol 3.826e-04 5.633e-04 Totals 3.S43e+03 4.07ge-Ol 6.093e-Ol 7.174e-04 1.072e-03 Sensitivity Variable Y Dose Point 1 (30fS) (2S.4 em) 0.6938 2.890e-Ol 1.318e-05 2.282e-05 2.544e-08 4,407e-08 1.1732 1.771e+03 1.588e-Ol 2.383e-Ol 2.838e-04 4.25ge-04 1.3325 1.771e+03 1.868e-Ol 2.718e-Ol 3.241e-04 4.715e-04 Totals 3.S43e+03 3.4S6e-Ol S.10Ie-0l 6.07ge-04 8.97Se-04 Sensitivity Variable Y Dose Point 1 (4ofS) (27.94 em) 0.6938 2.890e-01 1.128e-05 1.934e-05 2.17ge-08 3.734e-08 1.1732 1.771e+03 1.356e-Ol 2.017e-Ol 2,422e-04 3.604e-04 1.3325 1.771e+03 1.593e-Ol 2.29ge-O l 2.764e-04 3.988e-04 Totals 3.S43e+03 2.94ge-Ol 4.316e-Ol S.186e-04 7.S93e-04 Sensitivity Variable Y Dose Point 1 (S ofS) (30.48 em) 0.6938 2.890e-Ol 9.718e-06 1.653e-05 1.876e-08 3.192e-08 1.1732 1.77 1e+03 1.165e-Ol 1.723e-Ol 2.081e-04 3.07ge-04 1.3325 1.771e+03 1.368e-Ol 1.963e-Ol 2.373e-04 3,406e-04 Totals 3.S43e+03 2.S33e-Ol 3.686e-Ol 4.4SSe-04 6.48Se-04 Sensitivity Analysis Summary - Y Dose Point 1 D P' t # S 'ti 'ty Sensitivity Fluenee Rate Fluenee Rate Exposure Rate Exposure Rate ose om ensl VI , ,

DimenSIOn MeV/em'/see MeV/em'/see mRlbr mRlbr

Attachment 8.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 23 of48 No Buildup With Buildup No Buildup With Buildup 1 (1 of5) (20.32 em) 4.847e-Ol 7.370e-Ol 8.525e-04 1.297e-03 1 (2of5) (22.86 em) 4.07ge-Ol 6.093e-Ol 7.1 74e-04 1.072e-03 1 (30f5) (25.4 em) 3.456e-Ol 5.l01e-Ol 6.07ge-04 8.975e-04 1 (4of5) (27.94 em) 2.94ge-Ol 4.316e-Ol 5.1 86e-04 7.593e-04 1 (5 of 5) (30.48 em) 2.533e-Ol 3.686e-Ol 4.455e-04 6.485e-04

Attachment 8.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 24 of48 MicroShield 8.03 EnergySolutions (8.03-0000)

Date By Checked 12/212011 Robert F. Decker 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 em Geometry S - Cylinder Volume - End Shields Source Dimensions Height 15.24 em (6.0 in)

Radius 25.0 cm (9.S in)

Dose Points A X y z

1 0.0 em (0 in) 20.32 em (S.O in) 0.0 em (0 in)

Shields Shield N Dimension Material Density 3

Source 2.99e+04 cm Sand 1.6 Air Gap Air 0.00122 Source Input: Grouping Method - Actual Photon Energies Nuclide Ci Bq )lCi/cm' Bq/cm3 Ba-137m 4.5292e-00S 1.675Se+003 1.5136e-006 5.6003e-002 Cs-137 4.7S7Se-00S 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

Attachment 8.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 25 of48 Fluence Rate Fluence Rate Exposure Rate Exposure Rate Energy (MeV) Activity (photons/sec) MeV/cml/sec MeV/cml/sec mRlhr mRlhr No Buildup With Buildup No Buildup With Buildup 0.0045 l.740e+Ol 7.481e-08 7.70ge-08 5.l27e-08 5.284e-08 0.0318 3.46ge+Ol 9.338e-06 1.152e-05 7.778e-08 9.59ge-08 0.0322 6.401e+Ol l.797e-05 2.232e-05 1.446e-07 l.797e-07 0.0364 2.329e+Ol l.002e-05 l.33ge-05 5.691e-08 7.606e-08 0.6616 1.508e+03 8.942e-02 l.631e-Ol l.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 l.740e+01 7.48Ie-08 7.70ge-08 5.l27e-08 5.284e-08 0.0318 3.46ge+Ol 9.338e-06 1.152e-05 7.778e-08 9.59ge-08 0.0322 6.401e+Ol l.797e-05 2.232e-05 1.446e-07 l.797e-07 0.0364 2.329e+Ol l.002e-05 l.33ge-05 5.691e-08 7.606e-08 0.6616 1.508e+03 8.942e-02 l.631e-Ol 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+Ol 6.603e-08 6.801e-08 4.526e-08 4.662e-08 0.0318 3.46ge+Ol 8.221e-06 1.014e-05 6.848e-OS S.44Se-08 0.0322 6.401e+Ol 1.582e-05 1.964e-05 1.273e-07 l.581e-07 0.0364 2.329e+Ol 8.S00e-06 1.175e-05 5.000e-08 6.675e-08 0.6616 1.50Se+03 7.588e-02 l.354e-Ol 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+Ol 5.793e-08 5.966e-08 3.971e-08 4.0Sge-08 0.031S 3.469e+Ol 7.200e-06 S.SSOe-06 5.997e-OS 7.397e-08 0.0322 6.401e+Ol l.385e-05 1.71ge-05 1.115e-07 l.3S4e-07 0.0364 2.329e+Ol 7.697e-06 1.027e-05 4.373e-OS 5.S35e-08 0.6616 1.508e+03 6.468e-02 1.136e-Ol 1.254e-04 2.203e-04 Totals 1.647e+03 6.470e-02 1.137e-01 1.256e-04 2.206e-04 Sensitivity Variable Y Dose Point 1 (4 of 5) (27.94 cm) 0.0045 l.740e+Ol 5.066e-08 5.216e-08 3.472e-OS 3.575e-08

Attachment 8.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 26 of4B 0.0318 3.46ge+01 6.290e-06 7.7S7e-06 S.240e-08 6.46Ie-08 0.0322 6.40Ie+01 1.210e-OS l.S0Ie-OS 9.738e-08 1.208e-07 0.0364 2.32ge+01 6.71ge-06 8.961e-06 3.818e-08 S.092e-08 0.6616 I.S08e+03 S.S40e-02 9.62ge-02 1.074e-04 1.867e-04 Totals 1.647e+03 5.542e-02 9.632e-02 1.076e-04 1.86ge-04 Sensitivity Variable Y Dose Point 1 (5 of 5) (30.48 em) 0.004S 1.740e+Ol 4.423e-08 4.SS4e-08 3.032e-08 3.122e-08 0.0318 3.46ge+Ol S.493e-06 6.773e-06 4.576e-08 S.642e-08 0.0322 6.401e+Ol 1.0S7e-OS 1.311e-OS 8.504e-08 1.0SSe-07 0.0364 2.32ge+Ol S.86Se-06 7.81ge-06 3.332e-08 4.442e-08 0.6616 1.508e+03 4.771e-02 8.233e-02 9.2S0e-OS I.S96e-04 Totals 1.647e+03 4.774e-02 8.236e-02 9.26ge-05 1.598e-04 Sensitivity Analysis Summary - Y Dose Point 1 S *ti*ty Fluenee Rate Fluenee Rate Exposure Rate Exposure Rate Dose Point # Sensitivity D~nsl v.

1 MeV/em'/see MeV/em'/see mRlhr mRlhr unenslOn No Buildup With Buildup No Buildup With Buildup 1 (1ofS) (20.32 em) 8.946e-02 1.632e-Ol 1.737e-04 3.166e-04 I (20fS) (22.86 em) 7.S92e-02 1.3S4e-Ol 1.474e-04 2.628e-04 I (30fS) (2S.4 em) 6.470e-02 1.137e-Ol 1.2S6e-04 2.206e-04 I (40fS) (27.94 em) S.S42e-02 9.632e-02 1.076e-04 1.86ge-04 I (S ofS) (30.48 em) 4.774e-02 8.236e-02 9.26ge-OS l.S98e-04

Attachment 8.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 27 of48 MicroShield 8.03 EnergySolutions (8.03-0000)

Date By Checked 12/2/2011 Robert F. Decker Filename Run Date Run Time Duration Case 1 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 em (9.8 in)

Dose Points A X y z

1 0.0 cm (0 in) 20.32 em (S.O in) 0.0 em (0 in)

Shields Shield N Dimension Material Density Source 2.9ge+04 em' Sand 1.6 Air Gap Air 0.00122 Source Input: Grouping Method - Actual Photon Energies Nuclide Ci Bq "Cilcm' Bq/cm' Ba-137m 4.3028e-00S 1.5920e+003 1.437ge-006 5.3203e-002 Co-60 2.393ge-009 S.S574e+001 S.OOOOe-OOS 2.9600e-003 Cs-137 4.5484e-008 1.6S29e+003 1.5200e-006 5.6240e-002 Buildup: The material reference is Source Integration Parameters Radial 20 Circumferential 10 Y Direction (axial) 10 Results

Attachment 8.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 28 of 48 Fluence Rate Fluence Rate Exposure Rate Exposure Rate Energy (MeV) Activity (Photons/sec) MeV/cmz/sec MeV/cmz/sec mRlhr mRlhr No Buildup With Buildup No Buildup With Buildup 0.004S 1.6S3e+Ol 7.107e-OS 7.323e-OS 4.S71e-OS S.020e-OS 0.031S 3.296e+Ol S.S71e-06 1.09Se-OS 7.3Sge-OS 9.11ge-OS 0.0322 6.0S1e+Ol 1.707e-OS 2.121e-OS 1.374e-07 1.707e-07 0.0364 2.213e+Ol 9.516e-06 1.272e-OS S.407e-OS 7.226e-OS 0.6616 1.433e+03 S.49Se-02 l.SS0e-01 1.647e-04 3.004e-04 0.693S 1.44Se-02 9.120e-07 1.63ge-06 1.761e-09 3.16Se-09 1.1732 S.SS7e+Ol 1.112e-02 1.721e-02 1.9S7e-OS 3.07Se-OS 1.332S S.SS7e+Ol 1.311e-02 1.964e-02 2.27Se-OS 3.40Se-OS Totals 1.742e+03 1.092e-01 1.91ge-01 2.076e-04 3.656e-04 Sensitivity Variable Y Dose Point 1 (I of 5) (20.32 cm) 0.004S 1.6S3e+Ol 7. 107e-OS 7.323e-OS 4.S71e-OS S.020e-OS 0.031S 3.296e+Ol S.S71e-06 1.09Se-OS 7.3Sge-OS 9.11ge-OS 0.0322 6.0S1e+Ol 1.707e-OS 2.121e-05 1.374e-07 1.707e-07 0.0364 2.213e+Ol 9.S16e-06 1.272e-OS S.407e-OS 7.226e-OS 0.6616 1.433e+03 S.49Se-02 l.SS0e-01 1.647e-04 3.004e-04 0.693S 1.44Se-02 9.120e-07 1.63ge-06 1.761e-09 3.16Se-09 1.1732 S.SS7e+Ol 1.112e-02 1.721e-02 1.9S7e-OS 3.07Se-OS 1.332S S.SS7e+Ol 1.311e-02 1.964e-02 2.27Se-OS 3.40Se-OS Totals 1.742e+03 1.092e-01 1.91ge-01 2.076e-04 3.656e-04 Sensitivity Variable Y Dose Point 1 (2 of 5) (22.86 cm) 0.004S 1.6S3e+Ol 6.273e-OS 6.461e-OS 4.300e-OS 4.42ge-OS 0.031S 3.296e+Ol 7.SlOe-06 9.63Se-06 6.S0Se-OS S.026e-OS 0.0322 6.0S1e+Ol l.503e-OS l.S66e-OS 1.20ge-07 l.502e-07 0.0364 2.213e+Ol S.360e-06 1.116e-OS 4.750e-OS 6.341e-OS 0.6616 1.433e+03 7.20ge-02 1.2S6e-Ol 1.39Se-04 2.493e-04 0.693S 1.44Se-02 7.734e-07 1.360e-06 1.493e-09 2.626e-09 1.1732 S.SS7e+Ol 9.36Se-03 1.423e-02 1.673e-OS 2.S43e-OS 1.3325 S.SS7e+Ol 1.103e-02 1.623e-02 1.913e-OS 2.S17e-OS Totals 1.742e+03 9.25Ie-02 1.591e-01 1.75ge-04 3.033e-04

Attachment 8.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 29 0148 Sensitivity Variable Y Dose Point 1 (3 of 5) (25.4 cm) 0.0045 1.653e+Ol 5.504e-OS 5.66Se-OS 3.773e-OS 3.SS5e-OS 0.031S 3.296e+Ol 6.S40e-06 S.436e-06 5.697e-OS 7.027e-OS 0.0322 6.0S1e+Ol 1.316e-05 1.633e-05 1.05ge-07 1.314e-07 0.0364 2.213e+Ol 7.312e-06 9.757e-06 4.l55e-OS 5.543e-OS 0.6616 1.433e+03 6.144e-02 1.07ge-01 1.191e-04 2.093e-04 0.693S 1.445e-02 6.5Sge-07 1.141e-06 1.272e-09 2.203e-09 1.1732 S.S57e+Ol 7.941e-03 1.192e-02 1.41ge-05 2.l30e-05 1.3325 S.S57e+Ol 9.340e-03 1.35ge-02 1.620e-05 2.357e-05 Totals 1.742e+03 7.875e-02 1.335e-Ol 1.498e-04 2.544e-04 Sensitivity Variable Y Dose Point 1 (4 of 5) (27.94 cm) 0.0045 1.653e+Ol 4.S12e-OS 4.955e-OS 3.29ge-OS 3.396e-OS 0.031S 3.296e+Ol 5.976e-06 7.36ge-06 4.97Se-OS 6.13Se-OS 0.0322 6.0S1e+Ol 1.14ge-05 1.426e-05 9.251e-OS 1.14Se-07 0.0364 2.2 13 e+O1 6.3S3e-06 S.513e-06 3.627e-OS 4.S37e-OS 0.6616 1.433e+03 5.263e-02 9.1 47e-02 1.020e-04 1.773e-04 0.693S 1.445e-02 5.642e-07 9.66ge-07 1.0Sge-09 l.S67e-09 1.1732 S.S57e+Ol 6.77Se-03 1.00Se-02 1.211e-05 I.S02e-05 1.3325 S.S57e+Ol 7.965e-03 1.14ge-02 1.3S2e-05 1.994e-05 Totals 1.742e+03 6.739e-02 1.131e-Ol 1.282e-04 2.156e-04 Sensitivity Variable Y Dose Point 1 (50f5) (30.48 cm) 0.0045 1.653e+Ol 4.202e-OS 4.326e-OS 2.SS0e-OS 2.966e-OS 0.031S 3.296e+Ol 5.21ge-06 6.434e-06 4.347e-OS 5.360e-OS 0.0322 6.0S1e+Ol 1.004e-05 1.245e-05 S.07Se-OS 1.002e-07 0.0364 2.213e+Ol 5.571e-06 7.42Se-06 3.165e-OS 4.220e-OS 0.6616 1.433e+03 4.533e-02 7.S21e-02 S.7S7e-05 1.516e-04 0.693S 1.445e-02 4.S5ge-07 S.267e-07 9.3S1e-l0 1.596e-09 1.1732 S.S57e+Ol 5.S24e-03 S.614e-03 1.041e-05 1.53ge-05 1.3325 S.S57e+Ol 6.S40e-03 9.S16e-03 1.1S7e-05 l.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 Fluence Rate Fluence Rate Exposure Rate Exposure Rate

Attachment 8.2 EH&S TSD # 11*004 MicroShield' Code Runs Revision 00 Page 30 0148 Dimension MeV/cm'/sec MeV/cm'/sec mRlhr mRlhr No Buildup With Buildup No Buildup With Buildup I (1 of 5) (20.32 em) 1.092e-Ol 1.91ge-Ol 2.076e-04 3.656e-04 1 (2 of 5) (22.86 em) 9.251e-02 l.591e-Ol l.75ge-04 3.033e-04 1 (30f5) (25.4 em) 7.875e-02 l.335e-Ol 1.498e-04 2.544e-04 1 (40f5) (27.94 em) 6.73ge-02 1.131e-Ol 1.282e-04 2.156e-04 (5 of 5) (30.48 em) 5.801e-02 9.667e-02 1.103e-04 1.843e-04

Attachment 8.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 31 of48 MicroShield 8.03 EnergySolutions (8.03-0000)

Date By Checked 12/2/2011 Robert F. Decker Filename Run Date Run Time Duration Case 1 December 2, 2011 12:58:06 PM 00:00:00 Project Info Case Title 90% Cs-13 7 10% Co-6 Description Cs-137/Co-60 2.54 - 12.7 em Geometry 8 - Cylinder Volume - End Shields Source Dimensions Height 15.24 em (6.0 in)

Radius 25.0 em (9.S in)

Dose Points A X y z

1 0.0 em (0 in) 20.32 em (S.O in) 0.0 em (0 in)

Shields Shield N Dimension Material Density Source 2.99e+04 em' Sand 1.6 Air Gap Air 0.00122 Source Input: Grouping Method - Actual Photon Energies Nuclide Ci Bq "Cilcm' Bq/cm' Ba-137m 4.0763e-00S 1.50S2e+003 1.3 622e-006 5.0403e-002 Co-60 4.7S7Se-009 1.7715e+002 1.6000e-007 5.9200e-003 Cs-137 4.3090e-00S 1.5943e+003 1.4400e-006 5.32S0e-002 Buildup: The material reference is Source Integration Parameters Radial 20 Circumferential 10 Y Direction (axial) 10 Results

Attachment 8.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 32 of 48 Fluence Rate F1uence Rate Exposure Rate Exposure Rate Energy (MeV) Activity (Photons/sec) MeV/cm'/sec MeV/cm'/sec mRlhr mRlhr No Buildup With Buildup No Buildup With Buildup 0.0045 1.5600+01 6.733e-OS 6.93Se-OS 4.615e-OS 4.756e-OS 0.0318 3.123e+Ol 8.404e-06 1.037e-05 7.000e-08 8.63ge-08 0.0322 5.761e+Ol 1.617e-05 2.00ge-05 1.302e-07 1.617e-07 0.0364 2.096e+Ol 9.015e-06 1.205e-05 5.122e-08 6.846e-08 0.6616 1.357e+03 8.048e-02 1.468e-Ol 1.560e-04 2.846e-04 0.6938 2.S90e-02 1. 824e-06 3.278e-06 3.521e-09 6.32ge-09 1.1732 1.771e+02 2.224e-02 3.441e-02 3.974e-05 6.l50e-05 1.3325 1.771e+02 2.623e-02 3.92ge-02 4.550e-05 6.S16e-05 Totals 1.837e+03 1.290e-Ol 2.206e-Ol 2.416e-04 4.146e-04 Sensitivity Variable Y Dose Point 1 (lof5) (20.32 cm) 0.0045 1.566e+Ol 6.733e-08 6.938e-08 4.615e-08 4.756e-08 0.0318 3.123e+Ol 8.404e-06 1.037e-05 7.000e-OS 8.63ge-OS 0.0322 5.761e+Ol 1.617e-05 2.00ge-05 1.302e-07 1.617e-07 0.0364 2.0900+01 9.015e-06 1.205e-05 5.l22e-08 6.S4OO-OS 0.6616 1.357e+03 8.048e-02 1.468e-Ol 1.560e-04 2.S4OO-04 0.6938 2.89Oc-02 l.824e-06 3.278e-06 3.521e-09 6.32ge-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 3.92ge-02 4.550e-05 6.S16e-05 Totals 1.837e+03 1.290e-Ol 2.206e-0l 2.416e-04 4.146e-04 Sensitivity Variable Y Dose Point 1 (20f5) (22.86 cm) 0.0045 1.566e+Ol 5.943e-08 6.121e-08 4.073e-08 4.1 96e-08 0.0318 3.123e+Ol 7.39ge-06 9.128e-06 6.163e-08 7.603e-08 0.0322 5.761e+Ol 1.424e-05 1.768e-05 1.146e-07 1.423e-07 0.0364 2.096e+Ol 7.920e-06 1.057e-05 4.500e-08 6.007e-08 0.6616 1.357e+03 6.830e-02 1.218e-Ol 1.324e-04 2.362e-04 0.6938 2.S9OC-02 1.547e-06 2.720e-06 2.986e-09 5.251e-09 1.1732 1.771e+02 l.S73e-02 2.846e-02 3.347e-05 5.0S6e-05 1.3325 1.771e+02 2.205e-02 3.247e-02 3.S26e-05 5.633e-05 Totals 1.837e+03 1.091e-Ol 1.828e-Ol 2.044e-04 3.437e-04

Attachment 8.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 33 of48 Sensitivity Variable Y Dose Point 1 (30f5) (25.4 em) 0.0045 l.566e+Ol 5.214e-08 5.36ge-08 3.574e-08 3.680e-08 0.0318 3.123e+Ol 6.480e-06 7.992e-06 5.398e-08 6.657e-08 0.0322 5.761e+Ol l.247e-05 l.547e-05 l.003e-07 l.245e-07 0.0364 2.096e+Ol 6.928e-06 9.243e-06 3.936e-08 5.252e-08 0.5616 1.357e+03 5.821e-02 l.023e-01 1.128e-04 l.982e-04 0.6938 2.890e-02 1.318e-06 2.282e-06 2.544e-09 4.407e-09 1.1732 l.77 1e+02 l.588e-02 2.383e-02 2.838e-05 4.25ge-05 1.3325 l.771e+02 l.868e-02 2.718e-02 3.241e-05 4.715e-05 Totals 1.837e+03 9.280e-02 1.533e-Ol 1.73ge-04 2.883e-04 Sensitivity Variable Y Dose Point 1 (4of5) (27.94 em) 0.0045 l.566e+Ol 4.55ge-08 4.694e-08 3.l25e-08 3.218e-08 0.0318 3.123e+Ol 5.661e-06 6.981e-06 4.716e-08 5.815e-08 0.0322 5.761e+Ol l.08ge-05 1.351e-05 8.764e-08 l.088e-07 0.0364 2.096e+Ol 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 2.17ge-09 3.734e-09 1.1732 l.771e+02 1.356e-02 2.0 17e-02 2.422e-05 3.604e-05 1.3325 l.771e+02 l.593e-02 2.29ge-02 2.764e-05 3.988e-05 Totals 1.837e+03 7.937e-02 1.298e-Ol 1.487e-04 2.442e-04 Sensitivity Variable Y Dose Point 1 (5 of 5) (30.48 em) 0.0045 l.566e+Ol 3.981e-08 4.09ge-08 2.72ge-08 2.80ge-08 0.0318 3.123e+Ol 4.944e-06 6.096e-06 4.118e-08 5.078e-08 0.0322 5.761e+Ol 9.51Oe-06 1.180e-05 7.653e-08 9.496e-08 0.0364 2.096e+Ol 5.278e-06 7.037e-06 2.99ge-08 3.998e-08 0.6616 1.357e+03 4.294e-02 7.4lOe-02 8.325e-05 l.436e-04 0.6938 2.890e-02 9.718e-07 l.653e-06 l.876e-09 3.192e-09 1.1732 l.771e+02 1.165e-02 1.723e-02 2.081e-05 3.07ge-05 1.3325 l.771e+02 1.368e-02 1.963e-02 2.373e-05 3.406e-05 Totals 1.837e+03 6.82ge-02 1.110e-Ol 1.280e-04 2.087e-04 Sensitivity Analysis Summary - Y Dose Point 1 Dose Point # Sensitivity Sensitivity Fluenee Rate Fluenee Rate Exposure Rate Exposure Rate

Attachment 8.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 34 0148 Dimension MeV/cm'/sec MeV/cm'/sec mRlhr mRlhr No Buildup With Buildup No Buildup With Buildup (I of 5) (20.32 em) 1.290e-01 2.206e-0 1 2.416e-04 4. 146e-04 (20f5) (22.86 em) 1.091e-Ol 1.828e-01 2.044e-04 3.437e-04 1 (30f5) (25.4 em) 9.280e-02 1.533e-01 l.73ge-04 2.883e-04 1 (40f5) (27.94 em) 7.937e-02 1.298e-Ol 1.487e-04 2.442e-04 (5 of 5) (30.48 em) 6.82ge-02 1.l10e-Ol 1.280e-04 2.087e-04

Attachment 8.3 EH&S TSD # 11-004 Revision 00 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 Page 35 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 2.0" above Soil Surface @ Detector Centerline (7.62cm)

Detectable Detectable ~RlhlpCUg 1218/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpmJuRih Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co*60 Cs-137 cpm second MDCR MDCRaurvayor ~Rlh ~Rlh Total ~Rlh @7.62cm pCi/g 1.00E+03 1.67E+Ol 3.38E+02 4.78E+02 1.11E+00 O.OOE+OO 1.11E+00 1.072 1.0 2.00E+03 3.33E+Ol 4.78E+02 6.76E+02 1.S7E+00 O.OOE+OO 1.S7E+00 1.072 1.47 4.00E+03 6.67E+Ol 6.76E+02 9.S6E+02 2.22E+00 O.OOE+OO 2.22E+00 1.072 2.07 6.00E+03 1.00E+02 8.28E+02 1.17E+03 2.72E+00 O.OOE+OO 2.72E+00 1.072 2.S4 8.00E+03 1.33E+02 9.S6E+02 1.3SE+03 3.14E+00 O.OOE+OO 3.14E+00 1.072 2.93 1.00E+04 1.67E+02 1.07E+03 1.SlE+03 3.S2E+00 O.OOE+OO 3.S2E+00 1.072 3.28 1.20E+04 2.00E+02 1.1 7E+03 1.66E+03 3.8SE+00 O.OOE+OO 3.8SE+00 1.072 3.S9 1.40E+04 2.33E+02 1.26E+03 1.79E+03 4.16E+00 O.OOE+OO 4.16E+00 1.072 3.88 1.BOE+04 3.00E+02 1.43E+03 2.03E+03 4.72E+00 O.OOE+OO 4.72E+00 1.072 4.40 2.00E+04 3.33E+02 1.SlE+03 2.14E+03 4.97E+00 O.OOE+OO 4.97E+00 1.072 4.64 4.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E+00 O.OOE+OO 7.03E+00 1.072 6.S6 6.00E+04 1.00E+03 2.62E+03 3.70E+03 8.61 E+OO O.OOE+OO 8.61 E+OO 1.072 8.03 8.00E+04 1.33E+03 3.02E+03 4.28E+03 9.94E+00 O.OOE+OO 9.94E+00 1.072 9.28 1.00E+OS 1.67E+03 3.38E+03 4.78E+03 1.11E+Ol O.OOE+OO 1.11E+Ol 1.072 10.37 Co-60 100% Scan Speed 0.5 m/s MDC (in pCi/g) as a Function of Background 18.0 I

.~ -I:- 1 1 _' _I.

16.0 14.0 12.0

~

u 10.0

.-l_

Q. 8.0

.'" ** -f 6.0 2 O"-f[ me "d-cs __ . _

4.0 2.0 0.0 O.OE+OO 2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+OS Background (cpm)

Attachment 8,3 EH&S TSD # 11-004 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 Revision 00 Page 36 of 48 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% CcHiO 1.0 pCUg Scan Rate 0.5 mi. d'1.38 Detector end-cap 3.0* above Soli Surface @ Detector Centerline (10.16cm)

Detectable Detectable ~RlhlpCUg 12/8/2011 Exp. Rate Exp. Rate Detectable Mlcroshleld Counts cpm/uRih Scan 44-10 Bkg per 430 940 Exp. Rate Results MDC 1.0 Co-SO Cs-137 cpm second MDCR MDCR.._, ~Rlh ~Rlh Total ~Rlh @ 10.16 em pCl/g 1.00e+03 1.67E+Ol 3.38E+02 4.78E+02 1.11E+OO O.OOE+OO 1.11 E+OO 0.8975 1.2 2.00e+03 3.33E+Ol 4.78E+02 6.76E+02 1.57E+00 o.ooe+oo 1.57E+00 0.8975 1.75 4.00e+03 6.67E+Ol 6.76E+02 9.56E+02 2.22E+00 o.ooe+oo 2.22E+00 0.8975 2.48 6.00e+03 1.ooE+02 8.28E+02 1.17E+03 2.72E+00 O.ooE+OO 2.72E+OO 0.8975 3.03 8.ooe+03 1.33E+02 9.56E+02 1.35E+03 3.14E+00 O.ooE+OO 3.14E+OO 0.8975 3.50 1.ooe+04 1.67E+02 1.07E+03 1.51 E+03 3.52E+00 O.OOE+OO 3.52E+OO 0.8975 3.92 1.20e+04 2.00E+02 1.17E+03 1.66E+03 3.85E+00 O.OOE+oo 3.85E+00 0.8975 4.29 1.40e+04 2.33E+02 1.26E+03 1.79E+03 4.16E+OO O.OOE+oo 4.16E+00 0.8975 4.63 1.8CE+04 3.ooE+02 1.43E+03 2.03E+03 4.72E+OO O.ooE+oo 4.72E+00 0.8975 5.26 2.00E+04 3.33E+02 1.51E+03 2.14E+03 4.97E+OO O.ooE+OO 4.97E+00 0.8975 5.54 4.0CE+04 6.67E+02 2.14E+03 3.02E+03 7.03E+OO O.ooE+oo 7.03E+00 0.8975 7.83 6.0Ce+04 1.ooE+03 2.62E+03 3.70E+03 8.61E+00 O.ooE+OO 8.61 E+oo 0.8975 9.59 8.0CE+04 1.33E+03 3.02E+03 4.28E+03 9.94E+00 O.ooE+OO 9.94E+00 0.8975 11.08 1.00E+05 1.67E+03 3.38E+03 4.78E+03 1.11E+01 O.OOE+OO 1.11 E+Ol 0.8975 12.39 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Co-60 1.0 pCl/g Scan Rate 0.5 mi. d' 1.38 Detector end-cap 5.0" above Soil Surface @ Detector Centerline (15.24cm)

Detectable Detectable ~Rlh/pCl/g 121812011 Exp. Rate Exp. Rate Detectable Mlcroshlold Counts cpmluRih Scan 44-10 Bkg per 430 940 Exp. Rate Results MDC 1.0 CcHiO Cs-137 cpm second MDCR MDCR......,., ~h ~h Total ~RIh @l1S.24em pCi/g 1.ooe+03 1.67E+Ol 3.38E+02 4.78E+02 1.11E+00 O.ooE+OO 1.11E+00 0.6485 1.7 2.ooe+03 3.33E+Ol 4.78E+02 6.76E+02 1.57E+00 O.ooE+oo 1.57E+00 0.6485 2.42 4.ooE+03 6.67E+01 6.76E+02 9.56E+02 2.22E+00 O.OOE+oo 2.22E+00 0.6485 3.43 6.ooe+03 1.00E+02 8.28E+02 1.17E+03 2.72E+00 O.OOE+oo 2.72E+00 0.6485 4.20 8.00E+03 1.33E+02 9.56E+02 1.35E+03 3.14E+00 O.OOE+oo 3.14E+00 0.6485 4.85 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 3.52E+00 O.OOE+oo 3.52E+00 0.6485 5.42 1.20E+04 2.00E+02 1.17E+03 1.66E+03 3.85E+00 O.OOE+OO 3.85E+00 0.6485 5.94 1.40E+04 2.33E+02 1.26E+03 1.79E+03 4.16E+00 O.OOE+OO 4.16E+00 0.6485 6.41 1.80E+04 3.COE+02 1.43E+03 2.03E+03 4.72E+00 O.OOE+OO 4.72E+00 0.6485 7.27 2.00E+04 3.33E+02 1.51E+03 2.14E+03 4.97E+00 O.OOE+OO 4.97E+00 0.6485 7.67 4.0CE+04 6.67E+02 2.14E+03 3.02E+03 7.03E+OO O.OOE+OO 7.03E+00 0.6485 10.84 6.00e+04 1.00E+03 2.62E+03 3.70E+03 8.61E+00 O.OOE+OO 8.61E+00 0.6485 13.28 8.00E+04 1.33E+03 3.02E+03 4.28E+03 9.94E+00 O.ooE+OO 9.94E+00 0.6485 15.33 1.00E+05 1.67E+03 3.38E+03 4.78E+03 1.1 1E+Ol O.ooE+OO 1.11E+Ol 0.6485 17.14

Attachment 8,3 EH&S TSD # 11-004 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 Revision 00 Page 37 of 48 Soil Scan MOC For Ludlum 44-10 Nal Detector 100% Cs-137 1.0 pCUg d' .1.38 Scan Speed = 0.5 mi.

Detector end-cap 2.0" above 5011 Surface C!l Detector Centerline (7.82cm)

Area of Interest* 50 cm dia.; d' = 1.38 Detectable Detectable ~RlhlpCJ/g 121812011 Exp. Rate Exp. Rate Detectable Mlcroshleld Counts cpm/uRih Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co-SO Cs-137 cpm second MDCR MDCRsutY8)'Ot ~Rlh ~Rlh Total ~Rlh @7.S2cm pCl/g 1.00E+03 1.67E+Ol 3.38E+02 4.78E+02 O.OOE+OO 5.09E-Ol 5.09E-Ol 0.2628 1.9 2.00E+03 3.33E+Ol 4.78E+02 6.76E+02 O.OOE+OO 7.19E-Ol 7.19E-Ol 0.2628 2.74 4.0CE+03 6.67E+Ol 6.76E+02 9.56E+02 O.OOE+OO 1.02E+00 1.02E+00 0.2628 3.87 6.00E+03 1.00E+02 8.28E+02 1.1 7E+03 O.OOE+OO 1.25E+OO 1.25E+OO 0.2628 4.74 8.00E+03 1.33E+02 9.56E+02 1.35E+03 O.OOE+OO 1.44E+OO l.44E+OO 0.2628 5.47 l.OCE+04 1.67E+02 1.07E+03 1.51E+03 O.OOE+OO 1.61E+OO 1.61E+00 0.2628 6.12 1.2CE+04 2.00E+02 1.17E+03 1.66E+03 O.OOE+OO 1.76E+OO 1.76E+OO 0.2628 6.70 1.40E+04 2.33E+02 1.26E+03 1.79E+03 O.OOE+OO 1.90E+OO 1.90E+OO 0.2628 7.24 I .SOE+04 3.00E+02 1.43E+03 2.03E+03 O.OOE+OO 2.16E+OO 2.16E+OO 0.2628 8.21 2.00E+04 3.33E+02 1.51E+03 2.14E+03 O.OOE+OO 2.27E+00 2.27E+OO 0.2628 8.65 4.00E+04 6.67E+02 2.14E+03 3.02E+03 O.OOE+OO 3.22E+OO 3.22E+OO 0.2628 12.24 6.00E+04 1.00E+03 2.62E+03 3.70E+03 O.OOE+OO 3.94E+00 3.94E+OO 0.2628 14.99 8.0CE+04 1.33E+03 3.02E+03 4.28E+03 O.OOE+OO 4.55E+00 4.55E+00 0.2628 17.31 1.0CE+05 1.67E+03 3.38E+03 4.78E+03 O.OOE+OO 5.0SE+00 5.09E+00 0.2628 19.35

" ~- --~---~--- - - .._.- -------- -- -

C5-137 100% Scan Speed 0.5 m/5 MOe (In pCI/g) as a Function of Background 32.0 i=- f= -- -, r= L + -,

I 30.0 28.0

~

r=- L , 1

- -

1 26.0 - =

24.0 6 from nd.1~1 22.0 20.0 I

1 1

~ 18.0 .-0_ - -

1

,~

~ 16.0 -

. ,l' 3.c/!.from.enb-ca 14.0 r pO" ".... r-12.0 10.0

,,- '2' frO.I eJ" ca~

1 1-= ~

1= I- ".- ..

8.0 ;, ".. --= .. 1=

1-6.0 !7' - r I

~

4.0 2.0

~

= - 1= . ~

0.0 i *1= 1=' O.OE+OO 2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+05 Background cpm

_ _. _ _ ~_. J

Attachment 8.3 EH&S TSD # 11-004 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 Revision 00 Page 38 of48 Soil Scan MOe For Ludlum 44-10 Nal Detector 100% Cs*1371.0 pCilg d' = =

1.38 Scan Speed 0.5 mi.

Detector end-cap 3.0" above Soil Surface @ Detector Centerline (10.16cm)

Detectable Detectable ~RlhlpCUg 121812011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uRih Scan 44*10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co*50 Cs*137 cpm second MDCR MDCR""""" ~Rlh ~Rlh Total ~Rlh @10.15cm pCilg 1.00E+03 1.67E+01 3.38E+02 4.78E+02 O.OOE+OO 5.09E-01 5.09E-Ol 0.2206 2.3 2.00E+03 3.33E+Ol 4.78E+02 6.76E+02 O.OOE+OO 7.19E-01 7.19E-Ol 0.2206 3.26 4.00E+03 6.67E+Ol 6.76E+02 9.56E+02 O.OOE+OO 1.02E+00 1.02E+00 0.2206 4.61 6.00E+03 1.00E+02 8.28E+02 1.17E+03 O.OOE+OO 1.25E+00 1.25E+00 0.2206 5.65 8.00E+03 1.33E+02 9.56E+02 1.35E+03 O.OOE+OO 1.44E+00 1.44E+00 0.2206 6.52 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 O.OOE+OO 1.61E+00 1.61E+00 0.2206 7.29 1.20E+04 2.00E+02 1.17E+03 1.66E+03 O.OOE+OO 1.76E+00 1.76E+00 0.2206 7.99 1.40E+04 2.33E+02 1.26E+03 1.79E+03 O.OOE+OO 1.90E+00 1.90E+00 0.2206 8.63 1.80E+04 3.00E+02 1.43E+03 2.03E+03 O.OOE+OO 2.16E+00 2.16E+00 0.2206 9.78 2.00E+04 3.33E+02 1.51E+03 2.14E+03 O.OOE+OO 2.27E+00 2.27E+00 0.2206 10.31 4.00E+04 6.67E+02 2.14E+03 3.02E+03 O.OOE+OO 3.22E+00 3.22E+00 0.2206 14.58 6.00E+04 1.00E+03 2.62E+03 3.70E+03 O.OOE+OO 3.94E+00 3.94E+00 0.2206 17.86 8.00E+04 1.33E+03 3.02E+03 4.28E+03 O.OOE+OO 4.55E+00 4.55E+00 0.2206 20.62 1.00E+05 1.67E+03 3.38E+03 4.78E+03 O.OOE+OO 5.09E+00 5.09E+00 0.2206 23.05 Soil Scan MDC For Ludlum 44-10 Nal Detector

100% Cs-1371.0 pCilg d' 1.38 Scan Speed 0.5 mi.

Detector end*cap 5.0" above Soil Surface @ Detector Centerline (15.24 cm)

Detectable Detectable ~RlhlpCUg 121812011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uRih Scan 44*10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co*50 Cs*137 cpm second MDCR MDCR"...,.., ~Rlh ~Rlh Total ~Rlh @15.24cm pCi/g 1.00E+03 1.67E+C1 3.38E+02 4.78E+02 O.OOE+OO 5.09E-01 5.09E-01 0.1598 3.2 2.00E+03 3.33E+01 4.78E+02 6.76E+02 O.OOE+OO 7.19E-01 7.19E-01 0.1598 4.50 4.00E+03 6.67E+01 6.76E+02 9.56E+02 O.OOE+OO 1.02E+00 1.02E+00 0.1598 6.36 6.00E+03 1.00E+02 8.28E+02 1.17E+03 O.OOE+OO 1.25E+00 1.25E+00 0.1598 7.80 8.00E+03 1.33E+02 9.56E+02 1.35E+03 O.OOE+OO 1.44E+00 1.44E+00 0.1598 9.00 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 O.OOE+OO 1.61E+00 1.61E+00 0.1598 10.06 1.20E+04 2.00E+02 1.17E+03 1.66E+03 O.OOE+OO 1.76E+00 1.76E+00 0.1598 11.02 1.40E+04 2.33E+02 1.26E+03 1.79E+03 O.OOE+OO 1.90E+00 1.90E+00 0.1598 11.91 1.80E+04 3.00E+02 1.43E+03 2.03E+03 O.OOE+OO 2.16E+00 2.16E+00 0.1598 13.50 2.00E+04 3.33E+02 1.51E+03 2.14E+03 O.OOE+OO 2.27E+00 2.27E+00 0.1598 14.23 4.00E+04 6.67E+02 2.14E+03 3.02E+03 O.OOE+OO 3.22E+00 3.22E+00 0.1598 20.13 6.00E+04 1.00E+03 2.62E+03 3.70E+03 O.OOE+OO 3.94E+00 3.94E+00 0.1598 24.65 8.00E+04 1.33E+03 3.02E+03 4.28E+03 O.OOE+OO 4.55E+00 4.55E+00 0.1598 28.46 1.0CE+05 1.67E+03 3.38E+03 4.78E+03 O.OOE+OO 5.09E+00 5.09E+00 0.1598 31.82

Attachment 8.3 EH&S TSD # 11-004 Scan MOC for Various Nuclide Fractions of Co-SO and Cs-137 Revision 00 Page 39 of 48 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Cs-1371.0 pCUg Scan Rate = 0.25 mls d' = 1.38 Detector end-cap 2.0" above Soil Surface @ Detector Cente~in. (7.62 cm)

Detectable Detectable ~R1h1pCi/g 12/812011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uRih Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 0.5 Co-60 Cs-137 cpm second MDCR MDCRsurveyor ~R1h ~R1h Total ~R1h @7.62cm pCi/g 1.00E+03 8.33E+00 2.39E+02 3.38E+02 O.OOE+OO 3.60E-01 3.60E-01 0.2628 1.4 2.00E+03 1.67E+01 3.38E+02 4.78E+02 O.OOE+OO 5.09E-01 5.09E-1l1 0.2628 1.94 4.00E+03 3.33E+01 4.78E+02 6.76E+02 O.OOE+OO 7.19E-1l1 7.19E-1l1 0.2628 2.74 6.00E+03 5.00E+01 5.85E+02 8.28E+02 O.OOE+OO 8.81E-01 8.81E-01 0.2628 3.35 8.00E+03 6.67E+01 6.76E+02 9.56E+02 O.OOE+OO 1.02E+00 1.02E+OO 0.2628 3.87 1.00E+04 8.33E+01 7.56E+02 1.07E+03 O.OOE+OO 1.14E+00 1.14E+00 0.2628 4.33 1.20E+04 1.00E+02 8.28E+02 1.17E+03 O.OOE+OO 1.25E+00 1.25E+00 0.2628 4.74 1.40E+04 1.17E+02 8.94E+02 1.26E+03 O.OOE+OO 1.35E+00 1.35E+00 0.2628 5.12 1.80E+04 1.50E+02 1.01E+03 1.43E+03 O.OOE+OO 1.53E+00 1.53E+00 0.2628 5.81 2.00E+04 1.67E+02 1.07E+03 1.51E+03 O.OOE+OO 1.61E+00 1.61E+00 0.2628 6.12 4.00E+04 3.33E+02 1.51E+03 2.14E+03 O.OOE+OO 2.27E+OO 2.27E+00 0.2628 8.65 6.00E+04 5.00E+02 1.85E+03 2.62E+03 O.OOE+OO 2.79E+00 2.79E+00 0.2628 10.60 8.00E+04 6.67E+02 2.14E+03 3.02E+03 O.OOE+OO 3.22E+00 3.22E+00 0.2628 12.24 1.00E+05 8.33E+02 2.39E+03 3.38E+03 O.OOE+OO 3.60E+00 3.60E+00 0.2628 13.68 Cs-137 100% Scan Speed 0.25 mls MDC (in pCi/g) as a Function of Background

+

24.0 22.0 i.

20.0 18.0 16.0 14.0

,. 12.0 u

CL 10.0 8.0 6.0 4.0 2.0 0.0

+- -

O.OE+OO 2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+05 Background cpm

Attachment 8,3 EH&S TSD # 11-004 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 Revision 00 Page 40 of48 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Cs-137 1.0 pCUg Scan Rate = 0.25 m/s d' = 1.38 Delector end*cap 3.0" above Soil Surface @ Detector Cenlerline (10.16cm)

Delectable Delectable ~R1h1pCUg 12/812011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uRlh Scan 44*10 Bkg per => 430 940 Exp. Rate Results MDC 0.5 Co-60 Cs*137 cpm second MDCR MDCRsurveyor ~R1h ~R1h Total ~R1h @10.16cm pCi/g 1.00E+03 8.33E+00 2.39E+02 3.38E+02 O.OOE+OO 3.60E*Ol 3.60E*Ol 0.2206 1.6 2.00E+03 1.67E+Ol 3.38E+02 4.78E+02 O.OOE+OO 5.09E*Ol 5.09E*Ol 0.2206 2.31 4.00E+03 3.33E+Ol 4.78E+02 6.76E+02 O.OOE+OO 7.19E*Ol 7.19E*Ol 0.2206 3.26 6.00E+03 5.00E+Ol 5.85E+02 8.28E+02 O.OOE+OO 8.81E*Ol 8.81E-Ol 0.2206 3.99 8.00E+03 6.67E+Ol 6.76E+02 9.56E+02 O.OOE+OO 1.02E+00 1.02E+00 0.2206 4.61 1.00E+04 8.33E+Ol 7.56E+02 1.07E+03 O.OOE+OO 1.14E+00 1.14E+00 0.2206 5.15 1.20E+04 1.00E+02 8.28E+02 1.17E+03 O.OOE+OO 1.25E+00 1.25E+00 0.2206 5.65 1.40E+04 1.17E+02 8.94E+02 1.26E+03 O.OOE+OO 1.35E+00 1.35E+00 0.2206 6.10 1.80E+04 1.50E+02 1.01E+03 1.43E+03 O.OOE+OO 1.53E+00 1.53E+00 0.2206 6.92 2.00E+04 1.67E+02 1.07E+03 1.51E+03 O.OOE+OO 1.61E+00 1.61E+00 0.2206 7.29 4.00E+04 3.33E+02 1.51E+03 2.14E+03 O.OOE+OO 2.27E+00 2.27E+00 0.2206 10.31 6.00E+04 5.00E+02 1.85E+03 2.62E+03 O.OOE+OO 2.79E+00 2.79E+00 0.2206 12.63 8.00E+04 6.67E+02 2.14E+03 3.02E+03 O.OOE+OO 3.22E+00 3.22E+00 0.2206 14.58 1.00E+05 8.33E+02 2.39E+03 3.38E+03 O.OOE+OO 3.60E+00 3.60E+00 0.2206 16.30 Soil Scan MDC For Ludlum 44*10 Nal Detector 100% Cs*137 1.0 pCUg Scan Rale = 0.25 m/s d' = 1.38 Delector end*cap 5.0" above Soil Surface @ Detector Cenlerline (12.7cm)

Detectable Delectable ~R1h1pCUg 1218/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uRlh Scan 44*10 Bkg per => 430 940 Exp. Rate Results MDC 0.5 Co*60 Cs*137 cpm second MDCR MDCR.urwyor ~R1h ~R1h Total ~R1h @15.24cm pCi/g 1.00E+03 8.33E+00 2.39E+02 3.38E+02 O.OOE+OO 3.60E*Ol 3.60E*Ol 0.1598 2.3 2.00E+03 1.67E+Ol 3.38E+02 4.78E+02 O.OOE+OO 5.09E*Ol 5.09E*Ol 0.1598 3.18 4.00E+03 3.33E+Ol 4.78E+02 6.76E+02 O.OOE+OO 7.19E*Ol 7.19E*Ol 0.1598 4.50 6.00E+03 5.00E+Ol 5.85E+02 8.28E+02 O.OOE+OO 8.81E*Ol 8.81E*Ol 0.1598 5.51 8.00E+03 6.67E+Ol 6.76E+02 9.56E+02 O.OOE+OO 1.02E+00 1.02E+00 0.1598 6.36 1.00E+04 8.33E+Ol 7.56E+02 1.07E+03 O.OOE+OO 1.14E+00 1.14E+00 0.1598 7.12 1.20E+04 1.00E+02 8.28E+02 1.17E+03 O.OOE+OO 1.25E+00 1.25E+00 0.1598 7.80 1.40E+04 1.17E+02 8.94E+02 1.26E+03 O.OOE+OO 1.35E+00 1.35E+00 0.1598 8.42 1.80E+04 1.50E+02 1.01E+03 1.43E+03 O.OOE+OO 1.53E+00 1.53E+00 0.1598 9.55 2.00E+04 1.67E+02 1.07E+03 1.51E+03 O.OOE+OO 1.61E+00 1.61E+00 0.1598 10.06 4.00E+04 3.33E+02 1.51E+03 2.14E+03 O.OOE+OO 2.27E+00 2.27E+00 0.1598 14.23 6.00E+04 5.00E+02 1.85E+03 2.62E+03 O.OOE+OO 2.79E+00 2.79E+00 0.1598 17.43 8.00E+04 6.67E+02 2.14E+03 3.02E+03 O.OOE+OO 3.22E+00 3.22E+00 0.1598 20.13 1.00E+05 8.33E+02 2.39E+03 3.38E+03 O.OOE+OO 3.60E+00 3.60E+00 0.1598 22.50

Attachment 8,3 EH&S TSD # 11-004 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 Revision 00 Page 41 of48 Soil Scan MDC For I.udlum 44-10 Nal Detector 95% Cs-137, 5% C0-60 1_0 pCUg d' .1_38 Scan Speed 0_5 mls Detector end-cap 2_0" above Soil SurfKe @ Detector Centerline (7_62 em)

Detectable Detectable ~Rlh/pCilg 121812011 Exp_ Rate Exp_ Rate Detectable Mleroshleld Counts epm/uRih Scan 44-10 Bkg per => 430 940 Exp_ Rate Retlul18 MDC 1_0 Co-SO Cs-137 epm second MDCR MDCR.urv-yor ~Rlh ~Rlh Total ~Rlh @7.S2om pCI/g 1.00E+03 1.67E+Ol 3.38E+02 4.78E+02 5.56E-02 4.83E-Ol 5.39E-Ol 0.3033 1.8 2.00E+03 3.33E+Ol 4.78E+02 6.76E+02 7.86E-02 6.83E-01 7.62E-Ol 0.3033 2.51 4.00E+03 6.67E+Ol 6.76E+02 9.56E+02 1.11E-Ol 9.66E-01 1.08E+OO 0.3033 3.55 6.00E+03 1.00E+02 8.28E+02 1.17E+03 1.36E-01 1.18E+OO 1.32E+00 0.3033 4.35 8.00E+03 1.33E+02 9.56E+02 1.35E+03 1.57E-Ol 1.37E+OO 1.52E+OO 0.3033 5.02 1.00E+04 1.67E+02 1.07E+03 1.51E+03 1.76E-01 1.53E+00 1.70E+OO 0.3033 5.62 1.20E+04 2.00E+02 1.17E+03 1.66E+03 1.93E-Ol 1.67E+00 1.87E+OO 0.3033 6.15 1.4DE+04 2.33E+02 1.26E+03 1.79E+03 2.08E-Ol 1.81E+OO 2.02E+OO 0.3033 6.65 1.80E+04 3.00E+02 1.43E+03 2.03E+03 2.36E-Ol 2.05E+OO 2.29E+OO 0.3033 7.54 2.00E+04 3.33E+02 1.51E+03 2.14E+03 2.49E-Ol 2.16E+OO 2.41 E+OO 0.3033 7.94 4 .00E+04 6.67E+02 2.14E+03 3.02E+03 3.52E-Ol 3.06E+OO 3.41 E+OO 0.3033 11.23 6.00E+04 1.00E+03 2.62E+03 3.70E+03 4.31 E-Ol 3.74E+OO 4.17E+00 0.3033 13.76 8.00E+04 1.33E+03 3.02E+03 4.28E+03 4.97E-Ol 4.32E+OO 4.B2E+00 0.3033 15.89 1.00E+05 1.67E+03 3.38E+03 4.78E+03 5.56E-Ol 4.83E+00 5.39E+00 0.3033 17.76 C5-137 95% Co-60 5% Scan Speed 0.5 m/s MOC (in pCI/g) as a Function of Background 34.0 ~ ~ -~ ~

32.0 30.0 28.0 ,- -'- **

26.0 ~

24.0 r 22.0

~

-a Q,

20.0 18.0 16.0 14.0 12.0 10.0

~

,. . -c -

8.0

~~

6.0 -'"

4.0 2.0 ~ .J !

I-=,=-,

i 0.0 "

O.OE+OO 2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+05 Background cpm

, , _ _ _

_ __ o " o

o _ _ ._

Attachment 8.3 EH&S TSD # 11-004 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 Revision 00 Page 42 0148 Soil Scan MDC For Ludlum 44-10 Nal Detector 95% Cs*137, 5% C<H!O 1.0 pCUg d' .1.38 Scan Speed 0.5 mls Detector end-cap 3.0* above Soli Surface @ Detector Cente~ine (10.16 em)

Detectable Detectable ~RlhlpCUg 121812011 Exp. Rate Exp. Rate Detectable Microshield Counts cpmluRih Scan 44-10 Bkg per => 430 940 Exp. Rate Resulls MDC 1.0 Co-60 Cs-137 cpm second MDCR MDCRsuIWYor ~Rlh ~Rlh Total ~Rlh @10.16cm pCltg 1.00E+03 1.67E+01 3.38E+02 4.78E+02 5.56E-02 4.83E-01 5.39E-Ol 0.2544 2.1 2.00E+03 3.33E+01 4.78E+02 6.76E+02 7.86E-02 6.83E-Ol 7.62E-01 0.2544 2.99 4.00E+03 6.67E+01 6.76E+02 9.56E+02 1.11E-01 9.66E-Ol 1.08E+00 0.2544 4.24 S.OOE+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+OO 0.2544 5.99 1.00E+04 1.67E+02 1.07E+03 1.51E+03 1.76E-Ol 1.53E+OO 1.70E+OO 0.2544 6.70 1.20E+04 2.00E+02 1.17E+03 1.56E+03 1.93E-01 1.67E+OO 1.87E+OO 0.2544 7.34 1.40E+04 2.33E+02 1.26E+03 1.79E+03 2.08E-01 1.81E+OO 2.02E+OO 0.2544 7.92 1.80E+04 3.00E+02 1.43E+03 2.03E+03 2.36E-01 2.05E+OO 2.29E+OO 0.2544 8.98 2.00E+04 3.33E+02 1.51 E+03 2.14E+03 2.49E-01 2.16E+OO 2.41E+OO 0.2544 9.47 4.00E+04 6.67E+02 2.14E+03 3.02E+03 3.52E-01 3.06E+OO 3.41E+OO 0.2544 13.39 6.00E+04 1.00E+03 2.62E+03 3.70E+03 4.31 E-01 3.74E+OO 4.17E+OO 0.2544 16.40 8.00E+04 1.33E+03 3.02E+03 4.28E+03 4.97E-01 4.32E+OO 4.82E+OO 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 pCUg d' =1.38 Scan Speed 0.5 mts Detector end-cap 5.0" above 5011 Surface @ Detector Centerline (15.24 cm)

Detectable Detectable ~RlhfpCUg 121812011 Exp. Rate Exp. Rate Detectable Mlcroshield Counts cpmtuRih Scan 44-10 Bkg per => 430 940 Exp. Rate Results MOC 1.0 Co-6O Cs-137 cpm second MDCR MDCR....,.. pR/h ~h Total~ @15.24em pCitg 1.00E+03 1.67E+01 3.38E+02 4.78E+02 5.56E-02 4.83E-Ol 5.39E-01 0.1843 2.9 2.00E+03 3.33E+01 4.78E+02 6.76E+02 7.86E-02 6.83E-Ol 7.62E-Ol 0.1843 4 .13 4.00E+03 6.67E+01 6.76E+02 9.56E+02 1.11E-01 9.86E-01 1.08E+OO 0.1 843 5.85 6.00E+03 1.00E+02 8.28E+02 1.17E+03 1.36E-01 1.18E+OO 1.32E+OO 0.1843 7.16 8.00E+03 1.33E+02 9.56E+02 1.35E+03 1.57E-01 1.37E+OO 1.52E+OO 0.1843 8.27 1.00E+04 1.67E+02 1.07E+03 1.51E+03 1.76E-01 1.53E+OO 1.70E+OO 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-Ol 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 4.31 E-01 3.74E+00 4. 17E+OO 0.1843 22.64 8.00E+04 1.33E+03 3.02E+03 4.28E+03 4.97E-01 4.32E+OO 4.82E+OO 0.1643 26.14 1.00E+05 1.67E+03 3.36E+03 4.78E+03 5.56E-01 4.83E+OO 5.39E+OO 0.1 843 29.23

Attachment 8.3 EH&S TSD # 11-004 Revision 00 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 Page 43 of 48 SOli Scan MDC For Ludlum 44-10 Hal Detector 90% Cs*137. 10% CcHiO 1.0 pCUg II' = 1.38 Scan Speed 0.5 mls Detector end-cap 2.0" above Soil Surface C!l Detector Centerline (7.82 em)

Detectable Detectable llR/h1pCUg 121812011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uRih Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 1.0 Co-so Co-137 cpm second MDCR MDCR......,.. l'R1h l'R1h Tolall'R1h @7.S2cm pCl/g 1.00E+03 1.67E+Ol 3.38E+02 4.78E+02 1.IIE-lll 4.58E-lll 5.69E-lll 0.3437 1.7 2.00E+03 3.33E+Ol 4.78E+02 S.76E+02 1.57E-lll 6.47E-lll B.05E-lll 0.3437 2.34 4.00E+03 6.S7E+Ol 6.76E+02 9.56E+02 2.22E-lll 9. 15E-lll 1.14E+OO 0.3437 3.31 6.00E+03 1.00E+02 B.28E+02 1.17E+03 2.72E-lll 1.12E+OO 1.39E+OO 0.3437 4.05 B.00E+03 1.33E+02 9.56E+02 1.35E+03 3.14E-lll 1.29E+OO 1.61E+OO 0.3437 4.68 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 3.52E-Ol 1.45E+00 1.80E+00 0.3437 5.23 1.20E+04 2.00E+02 1.17E+03 1.66E+03 3.B5E-lll 1.59E+00 1.97E+00 0.3437 5.73 1.40E+04 2.33E+02 1.26E+03 1.79E+03 4.16E-lll 1.71E+00 2.13E+00 0.3437 6.19 1.80E+04 3.00E+02 1.43E+03 2.03E+03 4.72E-lll 1.94E+OO 2.41E+00 0.3437 7 .02 2.00E+04 3.33E+02 1.51E+03 2.14E+03 4.97E-lll 2.05E+OO 2.54E+OO 0.3437 7.40 4.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E-lll 2.89E+OO 3.60E+OO 0.3437 10.47 6.00E+04 1.00E+03 2.62E+03 3.70E+03 8.61E-lll 3.55E+OO 4.41E+OO 0.3437 12.82 8.00E+04 1.33E+03 3.02E+03 4.28E+03 9.94E-lll 4.09E+OO 5.09E+00 0.3437 14.80 1.00E+05 1.67E+03 3.38E+03 4.78E+03 1.IIE+OO 4.58E+00 5.69E+00 0.3437 16.55 Cs-137 90% Co-60 10% Scan Speed 0.5 mls MDC (In pCl/g) as a Function of Background 28.0 26.0 t.? ;'0" 24.0 :-..;

22.0 :.-=-f=' -'-

~~ . ,!

20.0 18.0 .

-'-- . 0-.. --;:;'~', !- . [ .~

.. 16.0

~ '==

14.0 12.0 ,,', :-... -: .. : I !

,0: :..:..:. -". ~

~~

10.0 8.0 1,.,..

-' .=

~~~

if '"

~ . '" =-

[i ' ;;;.0: .,-

6.0

~ ,

4.0 2.0 0.0 . ."- -'. =-= -'-

O.OE+OO 2.0E+04 4 .0E+04 6.0E+04 8.0E+04 1.0E+05 Background cpm

__ _ _ . _. _ _ _ _ _ _ _....J

Attachment 8.3 EH&S TSD # 11-004 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 Revision 00 Page 44 of 48 Soli Scan MDC For Ludlum 44*10 Nal Detector 90% C.*137,10% CcHiO 1.0 pCi/g If = 1.38 Scan Speed 0.5 mi.

Detector end-<:ap 3.0" above Soil Surface @l Detector Center1ine (10 .16 em)

Detectable Detectable ~RlhlpCilg 121812011 Exp. Rate Exp. Rate Detectable Microshield Counts epm/uRih Scan 44*10 Bkg per -> 430 940 Exp. Rate Results MDC 1.0 Co-60 C.*137 epm second MDCR MDCR.urv.yot ~Rlh ~Rlh Total ~Rlh I!!J 10.16 em pClIg 1.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11E'()1 4.58E'()1 5.69E*01 0.2883 2.0 2.00E+03 3.33E+01 4.78E+02 6.76E+02 1.57E'()1 6.47E'()1 8.05E'()1 0.2883 2.79 4.00E+03 6.67E+01 6.76E+02 9.66E+02 2.22E'()1 9.15E'()1 1.14E+OO 0.2883 3.95 6.00E+03 1.00E+02 8.28E+02 1.17E+03 2.72E'()1 1.12E+OO 1.39E+OO 0.2883 4.83 8.00E+03 1.33E+02 9.66E+02 1.35E+03 3. 14E.()1 1.29E+OO 1.61E+OO 0.2883 5.58 1.00E+04 1.67E+02 1.07E+03 1.51E+03 3.52E'()1 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 1.7BE+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.()1 1.94E+00 2.41E+00 0.2883 8.37 2.00E+04 3.33E+02 1.51E+03 2.14E+03 4.97E'()1 2.05E+OO 2.54E+OO 0.2883 8.82 4.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E'()1 2.89E+OO 3.60E+OO 0.2883 12.48 6.00E+04 1.00E+03 2.62E+03 3.70E+03 8.61 E.()1 3.55E+OO 4.41E+OO 0.2883 15.28 8.00E+04 1.33E+03 3.02E+03 4.28E+03 9.94E'()1 4.09E+OO 5.0BE+00 0.2883 17.65 1.00E+05 1.67E+03 3.36E+03 4.78E+03 1.11E+OO 4.66E+00 5.69E+00 0.2883 19.73 Soli Scan MDC For Ludlum 44*10 Nal Detector 90% Co*137, 10% Co*SO 1.0 pCi/g d'

1.38 Scan Speed 0.5 mi.

Detector end-cap 5.0" above Soil Surface @l Detector Centerline (IS.24om)

Detectable Detectable ~h1pCilg 121812011 Exp. Rate Exp. Rate Detectable Microstueld Counts epm/uRih Scan 44-10 Bkg per ~> 430 940 Exp. Rate Results MDC 1.0 Co-60 C.*137 epm second MDCR MDCR,....... ~Rlh ~Rlh Total ~Rlh I!!J 15.24 em pClIg 1.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11E*01 4.S8E*01 S.69E*01 0.2087 2.7 2.00E+03 3.33E+01 4.78E+02 6.76E+02 1.S7E*01 6.47E'()1 8.0SE'()1 0.2087 3.85 4.00E+03 6.67E+01 6.76E+02 9.66E+02 2.22E'()1 9.15E.()1 1.14E+OO 0.2087 5.45 6.00E+03 1.00E+02 8.28E+02 1.17E+03 2.72E'()1 1.12E+OO 1.39E+OO 0.2087 6.68 8.00E+03 1.33E+02 9.56E+02 1.35E+03 3.14E'()1 1.29E+OO 1.61E+OO 0 .2087 7.71 1.00E+04 1.67E+02 1.07E+03 1.S1E+03 3.52E'()1 1.45E+OO 1.80E+OO 0 .2087 8.62 1.20E+04 2.00E+02 1.17E+03 1.88E+03 3.8SE*01 1.S9E+OO 1.B7E+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.S1E+03 2.14E+03 4.B7E*01 2.05E+00 2.S4E+00 0.2087 12.19 4.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E*01 2.8BE+OO 3.60E+OO 0 .2087 17.24 6.00E+04 1.00E+03 2.62E+03 3.70E+03 8.61 E.()1 3.55E+OO 4.41 E+OO 0.2087 21 .11 8.00E+04 1.33E+03 3.02E+03 4.28E+03 9.94E'()1 4.09E+OO 5.09E+OO 0.2087 24.36 1.00E+05 1.67E+03 3.38E+03 4.78E+03 1.11E+OO 4.66E+OO S.69E+OO 0.2087 27.26

Attachment 8.3 EH&S TSD # 11-004 Scan MOC for Various Nuclide Fractions of Co-SO and Cs-137 Revision 00 Page 45 of4B Soli Scan MDC For Ludlum 44*10 Nal Detector 90% Cs*137,10% Co.oO 1.0 pCl/g d' = 1.38 Scan Speed 0.25 mi.

Detector end-cap 2.0" above Soli Surface @ Detector Cente~lne (7.52 cm)

Detectable Detectable "RlhlpCUg 121B12011 Exp. Rate Exp. Rate Detectable Microshleld Counts cpm/uRlh Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 0.5 Co.oO Cs-137 cpm second MDCR MDCR.....,o. "Rlh "Rlh Total I'RIh @7.62cm pCUg 1.00E+03 B.33E+OO 2.39E+02 3.3BE+02 7.86E-02 3.24E-Ol 4.02E-Ol 0.3437 1.2 2.00E+03 1.67E+Ol 3.38E+02 4.7BE+02 1.IIE-Ol 4.5BE-Ol 5.69E-Ol 0.3437 1.66 4.00E+03 3.33E+Ol 4.7BE+02 6.76E+02 1.57E-Ol 6.47E-Ol B.05E-Ol 0.3437 2.34 B.00E+03 6.67E+Ol 6.76E+02 9.56E+02 2.22E-Ol 9.15E-Ol 1.14E+00 0.3437 3.31 1.00E+04 B.33E+Ol 7.56E+02 1.07E+03 2.49E-Ol 1.02E+00 1.27E+00 0.3437 3.70 1.20E+04 1.00E+02 B.2BE+02 1.17E+03 2.72E-Ol 1.12E+OO 1.39E+OO 0.3437 4.05 1.40E+04 1.17E+02 B.94E+02 1.26E+03 2.94E-Ol 1.21E+OO 1.51E+OO 0.3437 4.3B 1.80E+04 1.50E+02 1.01 E+03 1.43E+03 3.34E-Ol 1.37E+00 1.71E+OO 0.3437 4.97 2.00E+04 1.67E+02 1.07E+03 1.51 E+03 3.52E-Ol 1.45E+00 I.BOE+OO 0.3437 5.23 4.00E+04 3.33E+02 1.51E+03 2.14E+03 4.97E-Ol 2.05E+00 2.54E+00 0.3437 7.40 6.00E+04 5.00E+02 I.B5E+03 2.62E+03 6.09E-Ol 2.51E+OO 3.12E+OO 0.3437 9.07 B.OOE+04 6.67E+02 2.14E+03 3.02E+03 7.03E-Ol 2.B9E+OO 3.50E+OO 0.3437 10.47 1.00E+05 B.33E+02 2.39E+03 3.38E+03 7.86E-Ol 3.24E+OO 4.02E+OO 0.3437 11.70 C$o137 90% Co-60 10% Scan Speed 0.2S MDC (in pCi/g) as a Function of Background 20.0 1- ,

18.0 16.0 14.0 12.0

-a 10.0 8.0 6.0 4.0 2.0 0.0 t-- I t-. - - _J O.OE+OO 2.0E+04 4.0E+04 6.0E+04 B.OE+04 1.0E+05 Background cpm

'------ -. --- --~---- .-- -- -- - --- -~-------'

Attachment 8.3 EH&S TSD # 11-004 Scan MOC for Various Nuclide Fractions of Co-SO and Cs-137 Revision 00 Page 46 of48 Soli Scan MDC For Ludlum 44-10 Na l Detector 90% Co-137, 10% Co-60 1.0 pCl/g d' = 1.38 Scan Speed 0.25 m/s Detector end-<:ap 3.0* above Soli Surface @ Detector Centerline (10.16 cm)

Detectable Detectable !1RfhIpCilg 1218/2011 Exp. Rate Exp. Rate Detectable Microshleld Counts cpm/uRlh Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 0.5 Co-60 Co-137 cpm second MDCR MDCR.....,.. fLRIh ~Rlh Total~h @10.16em pCilg 1.00E+03 8.33E+OO 2.39E+02 3.38E+02 7.65E-02 3.24E-Ol 4.02E-Ol 0.2883 1.4 2.00E+03 1.67E+O l 3.38E+02 4.78E+02 1.1 1 E-Ol 4.58E-Ol S.69E-01 0.2883 1.97 4 .00E+03 3.33E+Ol 4.78E+02 6.76E+02 I.S7E-Ol 6.47E-Ol 8.0SE-Ol 0.2883 2.79 8.00E+03 6.67E+Ol 6.76E+02 9.S6E+02 2.22E-Ol 9.1SE-Ol 1.14E+00 0.2883 3.9S 1.00E+04 8.33E+Ol 7.58E+02 1.07E+03 2.49E-Ol 1.02E+OO 1.27E+00 0.28B3 4 .41 1.20E+04 1.0oE+02 8.28E+02 1.17E+03 2.72E-Ol 1.12E+00 1.39E+Oo 0.2883 4.83 1.40E+04 1.17E+02 8.94E+02 1.26E+03 2.94E-Ol 1.21E+00 I .S1E+00 0.2883 S.22 1.80E+04 1.50E+02 l .oI E+03 1.43E+03 3.34E-Ol 1.37E+OO 1.71E+OO 0.2883 S.92 2.00E+04 1.67E+02 l.o7E+03 I .SIE+03 3.S2E-Ol 1.4SE+00 I .BOE+oO 0.2883 6.24 4.0oE+04 3.33E+02 I.SI E+03 2.14E+03 4.97E-ol 2.0SE+00 2.S4E+00 0.2883 8.B2 6.00E+04 S.00E+02 1.8SE+03 2.62E+03 6.09E-Ol 2.S1E+00 3.12E+Oo 0.28B3 10.81 8.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E-Ol 2.89E+00 3.60E+OO 0.2883 12.48 1.00E+OS 8.33E+02 2.39E+03 3.38E+03 7. 65E-Ol 3.24E+OO 4.o2E+OO 0.2883 13.9S Soli Scan MDC For Ludlum 44-10 Nal Detector 90% Cs-137, 10% C0-60 1.0 pCl/g d'

1.38 Detector end-<:ap 5.0" above Soil Surface @ Detector Centerline (15.24 em) Scan Speed 0.25 mls Detectable Detectable I1RfhIpCilg 1218/2011 Exp. Rate Exp. Rate Detectable Microshleld Counts cpmluRlh Scan 44-10 Bkg per => 430 940 Exp. Rate Results MDC 0.5 Co-6O C.-137 cpm second MDCR MDCR.w,.,.. ~h fLRIh Total~h @15.24em pCl/g 1.00E+03 8.33E+00 2.39E+02 3.38E+02 7.65E-02 3.24E-Ol 4.02E-Ol 0.2087 1.9 2.00E+03 1.67E+O l 3.38E+02 4.78E+02 1.11 E-Ol 4.S8E-O l S.69E-O l 0.2087 2.73 4 .00E+03 3.33E+Ol 4.78E+02 6.76E+02 I .S7E-Ol 6.47E-Ol 8.0SE-Ol 0.2087 3.85 8.00E+03 6.67E+Ol 6.76E+02 9.S6E+02 2.22E-ol 9.1SE-ol 1.14E+00 0.2087 S.4S 1.00E+04 8.33E+Ol 7.58E+02 1.07E+03 2.49E-Ol l .o2E+00 1.27E+00 0.2087 6.10 1.20E+04 1.00E+02 8.28E+02 1.17E+03 2.72E-Ol 1.12E+OO 1.39E+OO 0.2087 6.68 1.40E+04 1.17E+02 8.94E+02 1.26E+03 2.94E-Ol 1.21E+OO I .SIE+OO 0.2087 7.21 1.80E+04 I.S0E+02 l.oIE+03 1.43E+03 3.34E-Ol 1.37E+OO 1.71E+00 0.2087 8.18 2.00E+04 1.67E+02 1.07E+03 I .SIE+03 3.S2E-Ol 1.4SE+00 1.80E+00 0.2087 8.62 4 .00E+04 3.33E+02 I .SIE+03 2.14E+03 4.97E-Ol 2.0SE+00 2.54E+00 0.20B7 12.19 6.0oE+04 S.00E+02 1.B5E+03 2.62E+03 6.09E-Ol 2.S1E+00 3.12E+00 0.20B7 14.93 8.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E-Ol 2.89E+OO 3.60E+OO 0.2087 17.24 1.00E+OS B.33E+02 2.39E+03 3.3BE+03 7.65E-Ol 3.24E+OO 4.02E+OO 0.2087 19.27

Attachment 8.4 EH&S TSD # 11-004 Scan MDC Formulas and pCi/g Determination Example Revision 00 Page 47 of48 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 mls Area of Interest: 50 cm diameter (0.196 m 2) 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 (Si(h Si = 46.74%, 0 = 53.26%)

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

Detector Response (Cs-137): 940 cpml~ (See Table 1.0 and Attachment 8.1)

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

MicroShield J.1RIhIpCi/g: For varying distances and radionuclide mix (See Table below)

M'IcroSh'IeId' J.LIRIhIIP'Ci/12 Vaues I

Nuclide Nuclide Detector Distance Fraction Nuclide Nuclide Fraction to end cap Cs-13790% Fraction Fraction Cs-13795%

Inches (cm) Co-60 10% Cs-137100% Co-60 100%

Co-605%

2.0 (5.08) 0.3033 0.3437 0.2628 1.0720 I

3.0 (7.62) 0.2544 0.2883 0.2206 0.8975 I

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 [lIst determining the minimum detectable number of net source counts in the interval as given by Si.

SI = d'..jb; The value of d' is selected from Table 6.5 ofNUREG-1575 based on the required true positive and false positive rates and hi 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 mls (resulting in a detector residence time of 1 second) then Si (MDCR) is 8.28E+02 cpm as determined below:

O.S m scan width ( ) 1s counts m 6.00E + 03 cpm --s = 100 -. - - - "

O.S - scan rate 60 - mterval S m 1.38-YlOO = 13.8 counts [ 60s/m]

ls = 828 cpm = MDCR = sl

Attachment 8.4 EH&S TSD # 11-004 Scan MDC Formulas and pCi/g Determination Example Revision 00 Page 480148 The MDCR is adjusted using the surveyor efficiency (MDCR.urveyor) using the following formula:

MDCR MDCRsurveyor = JP Where, p is the surveyor efficiency (0.5).

8Z8cpm rn;: = 1,171 cpm = MDCRsurveyor vO.5 The MDCRsurveyor result is divided by the detector response factor for the radionuclide(s) in order to obtain I'R. TIlls illustration assumes 100% Cs-137 and the detector response factor is 940 cpm.

h ~ffl 1.171E + 03 cpm 1.246 J1R/h 940 cpm

'jil[7fi MicroShicld' runs were performed using the physical and survey parameters provided in this attaclunent to derive the I'R/jh conversion factors relative to nuclide mixture and detector end cap distance from the pC< 9 soil surface. The Table in this attaclunent 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 /lR/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 /lR!h g pCL/g Attaclunent 8.3 illustrates the Ludlum Model 44-10 MDC (in pCi/g) for different background values and mixtures ofCo-60 and Cs-137.

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