Reproducibility with 137Cs

From New IAC Wiki
Jump to navigation Jump to search

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) 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 (s) Distance to Faceplate (cm) Total Exposed Dose (mR) Total Exposed Dose (mRad)
12955.7 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 (s) Distance to Faceplate (cm) Total Exposed Dose (mR) Total Exposed Dose (mRad)
4977.83 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
OSLs for Linear Fit, 10/31/17
Run Time (min) Distance to Faceplate (cm) Total Exposed Dose (mR) Total Exposed Dose (mRad)
16.593 30
OSL # Position Initial Dose (mRad) Measured Dose (mRad) Normalized Dose (mRad) Average Dose (mRad) Standard Deviation
DN07916645R L 8.469945 - - - -
DN08225747P C 8.241027 - - - -
DN07924836M R 10.18683 - - - -


Run Time (s) Distance to Faceplate (cm) Total Exposed Dose (mR) Total Exposed Dose (mRad)
33.186 30
OSL # Position Initial Dose (mRad) Measured Dose (mRad) Normalized Dose (mRad) Average Dose (mRad) Standard Deviation
DN08229607R L 8.469945 - - - -
DN082562050 C 9.042238 - - - -
DN07923435X R 8.584403 - - - -


Run Time (s) Distance to Faceplate (cm) Total Exposed Dose (mR) Total Exposed Dose (mRad)
132.742 30 - -
OSL # Position Initial Dose (mRad) Measured Dose (mRad) Normalized Dose (mRad) Average Dose (mRad) Standard Deviation
DN079033634 66.72943 - - \ -
DN08270002C 68.10294 - - - -
DN08252656P 73.48249 - - / -

QC OSLs

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 /

Linear Fit

This fit was calculated using only the OSLs provided by Landauer for calibrating the OSL reader. [math] {\chi}^2 = 359.191[/math] [math] \text{# of Degrees of Freedom} = 13[/math]
This fit was calculated using the OSLs provided by Landauer and 6 Nanodot OSLs dosed by using the 137Cs source. [math] {\chi}^2 = 686.664[/math] [math] \text{# of Degrees of Freedom} = 19[/math]


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

Table Templates


Thesis

HC TriMeV