Specific Gamma Ray Constant (Г)

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    The Specific Gamma Ray Constant:

    • Relates exposure rate to Curie strength.
    • Can be measured as R-cm2 /mCi/hr. (Г)
    • Can also be measured as Г/10 = R-m2 /Ci/hr.


Radionuclide
Г
Г/10
I-125
0.27 0.027
Tc-99m
0.6 0.06
I-131
2.2 0.22
Co-60
13.2 1.32


Page 59

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