Abstract
Beta dose rates on the surfaces of cylindrical vessels containing radioactive solutions are calculated using an empirically based Monte Carlo method. Interior source random path length distributions are derived for the container, and energy deposition in a thin surface layer is determined from empirical formulae used by Charlton and Cormack and others. Calculated results for the method are compared with experimentally determined results for 32P in acrylic cylinders of varying wall thickness; these show good agreement if one assumes that the ratio of projected particle range to the continuous slowing down approximation range is 0.8. Using this ratio theoretical results are derived for 90Y, 32P, 198Au, 153Sm and 131I in containers of varying diameters and wall thicknesses with wall materials of acrylic, Pyrex glass, polycarbonate and polypropylene. These results could be used to objectively derive guidelines for the handling of vessels containing beta emitting radionuclides.
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