Monte Carlo Calculations of Gamma-Ray Backscattering

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Abstract
Monte Carlo calculations have been performed to determine the backscattering of i -rays with energies between 0.02 Mev and 2.0 Mev from hydrogen, water; concrete, iron, tin, and lead. The radiation was assumed to be incident on a semi-infinite medium, either isotropically, or at angles of 0[degree] (perpendicular incidence), 30[degree], 60[degree], or 90[degree] (grazing incidence). Several thousand photon histories were sampled with an IBM 704 computer to determine the albedo for each case. The information obtained includes (1) the number albedo and energy albedo, (2) the energy distribution of reflected radiation integrated over all directions, (3) the angular distribution integrated over all energies, (4) the angular distribution of the reflected energy, (5) the average energy of the photons reflected in various directions, and (6) the average obliquity of emergence of the reflected radiation as a function of the 7 -ray energy. Tables of albedo and illustrative energy spectra and angular distributions are given in this paper.

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