Abstract
A method of evaluating the γ-dose rate resulting from a point source and scattered by a semi-infinite plane surface has been developed in the form of a single scattering formula. In this formula, the effect of multiple reflection within the medium is incorporated as buildup factor for the reflected γ-rays. Results of calculation with this formula are compared with values based on a semi-empirical expression using the differential dose albedo of a semi-infinite concrete expanse, and with experimental values obtained on dose rates of γ-rays reflected by concrete and lead surfaces from point sources of 60Co (1.25 MeV), 137Cs (0.66 MeV) and 1922Ir (0.4 MeV). It is seen that the results of the calculation agree fairly well with the experimental results.
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