Gamma-ray Constant (Specific)
Published: Oct 12, 2018
The (specific) Gamma-ray Constant is a useful numerical quantity which is used to predict exposure in terms of Equivalent Dose per unit activity per unit distance. As the term is a constant, distance and activity values will vary in a linear fashion with distance and exposure, making approximate calculations of exposure (especially from Point Sources) very easy. For example, the gamma-ray constant for Cesium-137 is 76 micro Sv/h per GBq at 1m from a point source.