Diminution of Terrestrial Gamma Ray Dose Rate due to Snow Cover(II). In situ Measurement on a Flat Terrain.:In situ Measurement on a Flat Terrain

概要

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In order to clarify the diminution characteristics of terrestrial gamma rays due to snow cover, a series of measurements of gamma ray dose rate and flux density was performed on a rice field with and without snow cover, in which the distribution of both the radiation field and the snow depth seemed to be uniform. The diminution factors for the dose rate and the flux density derived from the measurement and various corrections, such as for the contribution of cosmic ray, self-contamination of 40K, and radon groups, showed a good agreement with those derived from Monte Carlo calculations. It was also shown that the melted snow water and the water content in the soil, in addition to the snow cover itself, can be significant factors affecting the diminution of terrestrial gamma rays, and that the accuracy of the evaluated contribution of radon and its daughters in air plays an important role for evaluation of the diminution factors.
日本保健物理学会の論文