Specific Gamma Ray Constant:
Г/10 = 0.027 R-m2 /Ci/hr for I-125
- What is the dose rate from a 100 mCi I-125 source at 1 meter?
- Г/10 = 0.027R-m2 /Ci/hr for I-125
- 100 mCi = 0.1 Ci
- 0.1 Ci x 0.027R-m2 /Ci/hr = 0.0027 R/hr at 1 meter = 2.7 mR/hr at 1 meter
Note that this is approximately 60 times less than the same amount of Co-60. The energy of the gamma
ray is very important in determining dose rate and shielding requirements.