環境放射線の変動要因に関する研究

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概要

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• Air-absorbed radiation doses, continuously measured around a nuclear power station, were analyzed in order to clarify the relationships between the variations of environmental radiation and the environmental factors peculiar to cold and snowy area along the coast of the Sea of Japan. First, the increase in doses was confirmed to a be derived from the precipitation originated from a high flux density of gamma-rays due to the decay products of ^<222>Rn. While the decrease was attributable to the shielding effect of a part of gamma-rays, especially from ^<40>K and ^<208>Tl in a soil surface covered by snow layers. Second, the vertical profile of environmental doses was practically established above the ground. The mean dose rates in the winter increased unexpectedly according to a quadratic curve in the upper region. Based on the observed results, the increasing tendency can most likely be attributed to bremsstrahlung X-rays generated from thunderclouds. It was assumed that this study was the first observation of an increasing radiation dose with height associated with winter thunderstorms. Third, it became evident that the sensitivity of a radiophotoluminescence glass dosimeter decreased by about 3〜5% in the winter season, when the mean temperature was relatively low, below 6.3℃. Finally, Monte Carlo calculations of terrestrial gamma-rays were carried out to simulate the observed doses above the ground.

• 社団法人日本分析化学会の論文
• 2004-11-05

著者

• 山崎 興樹

  新潟県放射線監視センター柏崎刈羽放射線監視センター

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