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)} = .35 \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

137Cs Shot Log

Dot OSLs

Date	Run Number	Run Time (s)	Distance to Faceplate	Number of OSLs in Stack	Dose Rate (R/hr)	Total Exposed Dose (R)	Measured Dose	Adjusted Dose
9/8/17	1	5660	30cm	11	18.7188	108536	-	-
9/8/17	1	5660	30cm	11	18.7188	108536	-	-
9/26/17	2	4500	30cm	11	18.7188	-	-	-
9/26/17	2	4500	30cm	11	18.7188	-	-	-

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

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

Nanodot OSL Quality Control

Date	Run Number	Run Time (s)	Distance to Faceplate	Number of OSLs	Total Exposed Dose (R)	Measured Dose	Adjusted Dose
10/12/17	1	284.04	30.5cm	3	5242.02	-	-

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

Reproducibility with 137Cs