Abstract
A simple theory concerning the photon induced electron emission and absorption is derived, based on the diffusion model proposed by Bethe, Rose and Smith. Analytical expressions are presented for emission efficiency and energy deposition of electrons produced in a slab exposed to 1.25 MeV gamma rays and compared to experimental measurements and Monte Carlo calculations. Although the agreement between them is generally good, in view of the simplified model, a considerable difference is shown for the forward emission efficiency in the case of a very thick slab compared to the electron range and for the backward emission efficiency in the case of a relatively thin slab or of very low atomic number material.
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