Abstract
When the absorbed fraction for internally emitted gamma rays is calculated in the approximation, neglecting both beam attenuation and scatter buildup, the absorbed fraction is proportional to the cube root of the mass. It is generally assumed that this approximation holds only for bodies whose linear dimensions are much less than the mean free path of the primary photons. In this paper, it is shown that the validity of this approximation holds to larger sizes. In particular, absorbed fractions as large as 0.2 will be calculated with an error of less than 10% for energies sufficiently far from the minimum of M,en/,. (E 0.1 MeV for a body in space, or E 0.2 MeV for a body embedded in scattering media).
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