Abstract
Most existing tables of beta ray depth dose distributions over estimate doses from skin contamination by up to 35%, because they were calculated for infinite, homogeneous media and therefore include backscattering from non-existent tissue behind the source. The Monte Carlo method has been used to calculate dose distributions from beta contamination on an air-water interface. Distributions were calculated for monoenergetic electrons from 0.025 to 4 MeV and for more than 130 beta emitters, both for point sources such as hot particles (dose being averaged over a plane circular area of 1 cm2) and on the axis of a large area source. The present paper gives such dose distributions for point sources of 45 emitters as well as doses at 0.07, 0.4, 3 and 10 mm depth for most of the emitters calculated. More extensive tables will be presented in a report. The effects on the dose of source area and of backscattering from air and water have been studied.
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