Reproducibility with 137Cs

Dose Calculations and 137Cs Shot Log

Source Calibration and Dose Rate Data

Date	Initial Source Strength (Ci)	Current Source Strength (Ci)	Distance to Faceplate (cm)	Exposure Rate (Roentgen/hr)°
6/27/17	20	9.3	30.5	17.691
9/11/17	20	9.3	30.5	17.606

°Calculated by TSO using [math]\dot R = \frac {\Gamma A }{ D^2} [/math] where [math]\boldsymbol{\Gamma} = 3.3 \frac {(cm^2)(R)}{(mCi)(hr)} = .33 \frac {(m^2)(R)}{(Ci)(hr)} [/math] , [math]\mathbf{A} = 9.3 Ci [/math] , [math]\mathbf{D}=(\text{Distance to faceplate} + 11.2cm) [/math]

There is an adjustment distance of 11.2cm which accounts for the distance from the faceplate to the [math] ^{137}Cs[/math] source

Total exposures are calculated by [math]\int\limits_{t_0}^{t_f}\dot R\ dt [/math]

137Cs Shot Log

Dot OSLs

Date	Run Number	Run Time (s)	Distance to Faceplate	Number of OSLs in Stack	Exposure Rate (R/hr)	Total Exposed Dose (mR)
9/8/17	1	5660	30cm	11	18.7188	30148.8
9/8/17	1	5660	30cm	11	18.7188	30148.8
9/26/17	2	4500	30cm	11	18.7188	23398.6
9/26/17	2	4500	30cm	11	18.7188	23398.6

In these calculations, [math]\Gamma = 0.35 \frac {(m^2)(R)}{(Ci)(hr)} [/math]

Nanodot OSL Calibration and Quality Control

Calibration OSLs

Landauer Dosed OSLs

OSL #	Listed Dose (mRad)	Measured Dose (mRad)	Average Dose (mRad)
DN08276339J	Unexposed	71.19332	\
DN08276683L	Unexposed	70.39211	72.10899
DN08258554P	Unexposed	74.74154	/
DN10806640H	500	687.3246	\
DN10608908Z	500	681.0294	683.2422333
DN10806620J	500	681.3727	/
DN105057582	3000	3563.558	\
DN104085766	3000	3522.352	3567.258333
DN10608909X	3000	3615.865	/
DN108066085	50000	55966.55	\
DN103091798	50000	55420.36	55622.12
DN104086665	50000	55479.45	/
DN10606601L	100000	111610.5	\
DN106066095	100000	114271.2	114191.3333
DN10712163M	100000	116692.3	/

137Cs Calibration OSLs

OSLs for Linear Fit, 10/24/27

Run Time (s)	Distance to Faceplate (cm)	OSL #	Total Exposed Dose (mR)	Initial Dose (mRad)	Measured Dose (mRad)	Normalized Dose (mRad)	Average Dose (mRad)
4977.83	30	DN08252102C	25000	7.210899	-	-	-
4977.83	30	DN08229824R	25000	9.84345	-	-	-
4977.83	30	DN08241536W	25000	9.042238	-	-	-

Run Time (s)	Distance to Faceplate (cm)	OSL #	Total Exposed Dose (mR)	Initial Dose (mRad)	Measured Dose (mRad)	Normalized Dose (mRad)	Average Dose (mRad)
12955.7	30	DN08254785K	63515.9	70.16319	-	-	-
12955.7	30	DN08268309M	63515.9	70.50657	-	-	-
12955.7	30	DN08255639I	63515.9	67.87402	-	-	-

QC OSLs

OSL #	Listed Dose (mRad)	Measured Dose (mRad)	Average Dose (mRad)
DN08264870R	Unexposed	69.36198	\
DN082701640	Unexposed	77.25963	74.74153667
DN08269802P	Unexposed	77.603	/
DN10712168C	1000	1235.238	\
DN10309170Q	1000	1223.106	1226.119667
DN102095379	1000	1220.015	/

Linear Fit

This fit was calculated using only the OSLs provided by Landauer for calibrating the OSL reader. [math] {\chi}^2 = 359.191[/math] [math] \text{# of Degrees of Freedom} = 13[/math]

Nanodot OSLS

Run 1, 10/12/17

Run Time (s)	Distance to Faceplate (cm)	Number of OSLs	Total Exposed Dose (mR)
284.04	30.5cm	3	1476.92

OSL #	Listed Dose (mRad)	Measured Dose (mRad)	Average Dose (mRad)	Standard Deviation
DN08252102C	Unexposed	1161.413	\
DN08241536W	Unexposed	1064.58	1148.9367	78.8622
DN08229824R	Unexposed	1220.817	/

Run 2, 10/23/17

Run Time (s)	Distance to Faceplate (cm)	Number of OSLs	Total Exposed Dose (mR)
114.187	20	3	1000

OSL #	Initial Dose (mRad)	Measured Dose (mRad)	Normalized Dose (mRad)	Average Dose (mRad)	Standard Deviation
DN07916645R	64.3258	911.6636	847.3378	\
DN08225747P	67.18726	981.7123	914.52504	839.0586133	79.9283
DN07924836M	66.72943	822.9581	755.313	/

Run 3, 10/23/17

Run Time (s)	Distance to Faceplate (cm)	Number of OSLs	Total Exposed Dose (mR)
153.75	40	3	500

OSL #	Initial Dose (mRad)	Measured Dose (mRad)	Normalized Dose (mRad)	Average Dose (mRad)	Standard Deviation
DN08229607R	66.84389	410.9068	344.06291	\
DN082562050	70.04873	398.2018	328.15307	327.0466833	17.5955
DN07923435X	67.6451	375.6535	308.92407	/

Run 4

Run Time (s)	Distance to Faceplate (cm)	Number of OSLs	Total Exposed Dose (mR)
	-	-	-

OSL #	Initial Dose (mRad)	Measured Dose (mRad)	Normalized Dose (mRad)	Average Dose (mRad)
	-	-	-	\
	-	-	-	-
	-	-	-	/

HC TriMeV