Difference between revisions of "Calibration Info"
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To fully understand the relationship between PMT Counts and total exposure for the Nanodot OSLs, a custom calibration is needed. This calibration is used in lieu of the calibration created by the OSL reader, which is created using the pre-dosed OSLs from the manufacturer. To begin the calibration, a set of fifteen unexposed Nanodot OSLs is chosen at random and exposed to a 9.3Ci <math> ^{137}Cesium</math> source. Using a distance of 30cm from the faceplate of the source, the exposure rate is calculated in Roentgen using <math> \dot R = \frac {\Gamma A }{ D^2} </math>. The gamma factor used for these calculations is <math> {\Gamma} = .33 \frac {(m^2)(R)}{(Ci)(hr)} </math> | To fully understand the relationship between PMT Counts and total exposure for the Nanodot OSLs, a custom calibration is needed. This calibration is used in lieu of the calibration created by the OSL reader, which is created using the pre-dosed OSLs from the manufacturer. To begin the calibration, a set of fifteen unexposed Nanodot OSLs is chosen at random and exposed to a 9.3Ci <math> ^{137}Cesium</math> source. Using a distance of 30cm from the faceplate of the source, the exposure rate is calculated in Roentgen using <math> \dot R = \frac {\Gamma A }{ D^2} </math>. The gamma factor used for these calculations is <math> {\Gamma} = .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 surface of the <math> ^{137}Cs</math> source | There is an adjustment distance of 11.2cm which accounts for the distance from the faceplate to the surface of the <math> ^{137}Cs</math> source | ||
Revision as of 23:22, 15 May 2018
To fully understand the relationship between PMT Counts and total exposure for the Nanodot OSLs, a custom calibration is needed. This calibration is used in lieu of the calibration created by the OSL reader, which is created using the pre-dosed OSLs from the manufacturer. To begin the calibration, a set of fifteen unexposed Nanodot OSLs is chosen at random and exposed to a 9.3Ci source. Using a distance of 30cm from the faceplate of the source, the exposure rate is calculated in Roentgen using . The gamma factor used for these calculations is
,
There is an adjustment distance of 11.2cm which accounts for the distance from the faceplate to the surface of the source
Total exposures are calculated by