三宅島の環境放射線(能)(第2部:和文論文)

概要

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In order to confirm the radiation safety for an active volcanic island, Miyake-jima, environmental radiation and radioactivity have been investigated. The average, minimum and maximum of the environmental gamma-ray dose rates were estimated to be 18.6nGy・h^<-1>, 6.7nGy・h^<-1> and 29.2nGy・h^<-1>, respectively. For the radioactivity in soils, the averages of ^<238>U, ^<232>Th and potassium concentrations were found from calculations to be 0.38μg・g^<-1>, 0.43μg・g^<-1> and 0.38%, respectively. The radon exhalation rate was below the detection limit, and the average value of thoron exhalation rate was estimated to be 38 mBq・m^<-2>・s^<-1>. These results are clear evidence that the radiation level and radioactivity on Miyake-jima are lower than the averages in other parts of Japan. It was confirmed that Miyake-jima is presently a safe island in terms of environmental radiation and radioactivity level.
日本保健物理学会の論文