I need to change the exposed doses by changing from seconds to hours. Unit problems.
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 |
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
|
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
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
| 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]
Nanodot OSLS
Run 1
| Date |
Run Number |
Run Time (s) |
Distance to Faceplate |
Number of OSLs |
Total Exposed Dose (mR)
|
| 10/12/17 |
1 |
284.04 |
30.5cm |
3 |
1476.92
|
| OSL # |
Listed Dose (mRad) |
Measured Dose (mRad) |
Average Dose (mRad)
|
| DN08252102C |
Unexposed |
1161.413 |
\
|
| DN08241536W |
Unexposed |
1064.58 |
1148.9367
|
| DN08229824R |
Unexposed |
1220.817 |
/
|
Reproducibility with 137Cs