Point Isotropic Gamma-Ray Buildup Factors in Concrete

Abstract
Gamma-ray buildup factors in ordinary concrete have been calculated by the moments method. Results for concrete kerma and air kerma are tabulated for source energies from 15 MeV to 15 keV. Parameters are given that allow calculation of the buildup factor by means of a simple analytic expression. Comparisons are made with earlier calculations, and the effects of annihilation radiation are discussed.

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