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)
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	84234.8
9/26/17	2	4500	30cm	11	18.7188	84234.8

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)
10/12/17	1	284.04	30.5cm	3	5242.02

Calibration 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 || /

QC OSLs Averages 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 /

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

Reproducibility with 137Cs