大型輸送物周辺の線量率分布予測計算への立体角法の適用

概要

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Gamma-ray dose rate distributions were measured around the spent fuel shipping cask and in the spent fuel shipping boat HINOURA MARU. Measured dose rate distributions show that the attenuation of the dose rate around the shipping cask is slower than the r^<-2> rule governing the radiation field around a point isotropic source. Thus, the measured distributions suggest that the rule is not suitable for shipping cask cases. A simple empirical formula based on the solid angle method, D=T_<ID>. Ω_x/Ω_1 (mrem/hr) is introduced, where T_<ID> is the dose rate (mrem/hr) at 1 meter distance from the surface of a package, Ω_1 and Ω_x are solid angles at 1 meter and x meter distance from the surface of the package respectively. The formula explaines the measured values fairly well. The formula is also applicable to the estimation of dose rate distributions around a cask in the spent fuel shipping boat. The calculated dose rates agree well with the measured ones in the hold loaded with the shipping cask.
独立行政法人海上技術安全研究所の論文
1980-07-31