Reproducibility with 137Cs
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]\displaystyle{ \dot R = \frac {\Gamma A }{ D^2} }[/math] where [math]\displaystyle{ \boldsymbol{\Gamma} = 3.3 \frac {(cm^2)(R)}{(mCi)(hr)} = .33 \frac {(m^2)(R)}{(Ci)(hr)} }[/math] , [math]\displaystyle{ \mathbf{A} = 9.3 Ci }[/math] , [math]\displaystyle{ \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]\displaystyle{ ^{137}Cs }[/math] source
Total exposures are calculated by [math]\displaystyle{ \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 (mRad) 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]\displaystyle{ \Gamma = 0.35 \frac {(m^2)(R)}{(Ci)(hr)} }[/math]
Nanodot OSL Calibration and Quality Control
Landauer Dosed OSLs
OSL # Listed Dose (mRad) PMT Counts 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
Click here for calibration data
QC OSLs
OSL # Listed Dose (mRad) Measured Dose (mRad) Measured PMT Counts 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 - /