Reproducibility with 137Cs

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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 (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]\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 - /

Linear Fits

Roentgen to Rad Conversion

OSL Reader

Table Templates


Thesis

HC TriMeV