Dose Equivalent Index for Fast Electrons

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Abstract
Monte Carlo calculations of deep and shallow dose equivalent index produced by electron beams in the energy region 5-22 MeV were performed for unidirectional, opposing, rotating and isotropic irradiations of the spherical tissue equivalent phantom. The observed dose maxima were attributed to multiple scattering and range effects and occurred in the outer 10 mm shell. The isotropy factor varied from 2.48 at 5 MeV to 1.89 at 22 MeV. The signal of a detector with isotropic response and wall thickness 0.5 g/cm2 was a suitable measure of dose equivalent index for fast electrons. Average dose equivalent in the spherical phantom was discussed as an alternative concept.

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