Calculations of Effective Dose and Ambient Dose Equivalent Conversion Coefficients for High Energy Photons

概要

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The conversion coefficients from photon fluence to ambient dose equivalent, H*(10) and effective doses were calculated for photons up to 10 GeV. A Monte Carlo code EGS4 was used for these calculations and secondary particle transports were considered. The calculated ambient dose equivalents were compared to the calculated effective doses. The comparison shows that the ambient dose equivalents at 1 cm depth, H*(10) understimate the effective doses at the energy above 5 MeV. H*(10) is not suitable operational quantity since it does not provide reasonable estimation of effective dose. It is difficult to define the operational quantity which can be consistently used for photons from low evergy to high energy above 10 MeV. Instead of operational quantities, the maximum effective dose in various irradiation geometries can be used for shielding design calculations.
社団法人日本原子力学会の論文
1999-11-25