The collision density of photons in an infinite Compton-scattering medium was calculated by random sampling. The intensity, spectral composition, a nd angular distribution were then determined for radiation reflected and t ransmitted by plane-parallel barriers by carrying out appropriate integrations over the collision density, taking into account the a bsorbing properties of t he medium and the effect of boundaries. All numerical work was done on the National Bureau of Standards automatic computer (SEAC). Sample results a re presented for O.66-Mev radiation incident on water barriers of various thicknesses.
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M. J. Berger (1955) studied this question.