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 (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) 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

OSLs for Linear Fit, 10/24/27
Run Time (min) Distance to Faceplate (cm) Total Exposed Dose (mR) Total Exposed Dose (mRad)
215.928 30 63515.9 55715.7
OSL # Initial Dose (mRad) Measured Dose (mRad) Normalized Dose (mRad) Average Dose (mRad) Standard Deviation
DN08252102C 7.210899 61287.88 61280.6691 \ 2571.18751
DN08229824R 9.84345 59564.67 59554.82655 59019.37114 2571.18751
DN08241536W 9.042238 56231.66 56222.61776 / 2571.18751


Run Time (min) Distance to Faceplate (cm) Total Exposed Dose (mR) Total Exposed Dose (mRad)
82.964 30 25000 21929.8
OSL # Initial Dose (mRad) Measured Dose (mRad) Normalized Dose (mRad) Average Dose (mRad) Standard Deviation
DN08254785K 70.16319 21638.25 21568.08681 \ 350.8108694
DN08268309M 70.50657 21948.07 21877.56343 21541.05207 350.8108694
DN08255639I 67.87402 21245.38 21177.50598 / 350.8108694

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

Nanodot OSLS

Run 1, 10/12/17

Run Time (s) Distance to Faceplate (cm) Number of OSLs Total Exposed Dose (mR) Total Exposed Dose (mRad)
284.04 30.5cm 3 1476.92 1295.54
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) Total Exposed Dose (mRad)
114.187 20 3 1000 877.193
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) Total Exposed Dose (mRad)
153.75 40 3 500 438.596
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 /

Roentgen to Rad Conversion

OSL Reader

Table Templates


Thesis

HC TriMeV

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