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