Abstract
Fast electrons interact with matter in many ways, but here we shall concern ourselves with only four aspects of this interaction, namely inelastic collisions, radiative collisions, elastic scatter, and secondary electron production. These four processes play the largest role in determining the size and the pattern of the absorbed energy distribution from a beam of fast electrons. To further limit the problem, I shall consider only the energy range relevant to radiation therapy (roughly 5 to 50 MeV), and only atomic numbers of interest in medicine and biology (that is, atomic numbers up to 20, that of calcium). Within these limitations, let me now remind you of certain physical aspects of the four electron interactions under consideration.
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