Dose Calculations and 137Cs Shot Log

Source Calibration Data

According to the TSO calibration paperwork from 6/27/17, at 30.5cm, the exposure rate of the 20Ci source is 17.691 R/hr. The source strength on this date was 9.3Ci.

Date	Initial Source Strength (Ci)	Current Source Strength	Distance to Source (cm)	Exposure Rate (Roentgen/hr)
6/27/17	20	9.3	30.5	17.691
9/11/17	1	5660	30cm	11

Date	Run Number	Run Time (s)	Distance to Source	Number of OSLs in Stack
9/8/17	1	5660	30cm	11
9/8/17	1	5660	30cm	11
9/26/17	2	4500	30cm	11
9/26/17	2	4500	30cm	11

According to the TSO calibration paperwork from 6/27/17, at 30.5cm, the exposure rate of the 20Ci source is 17.691 R/hr. The source strength on this date was 9.3Ci.

Calibration paperwork update to 9/11/17, at 30.5cm, the exposure rate of the 20Ci source is 17.606 R/hr. The source strength on this date was 9.3Ci.

Reproducibility with 137Cs