Journal Article Contribution ratios of natural radionuclides to ambient dose rate in air after the Fukushima Daiichi Nuclear Power Plant Accident

Inoue, Kazumasa  ,  Tsuruoka, Hiroshi  ,  Le Van, Tan  ,  Fukushi, Masahiro

307 ( 1 )  , pp.507 - 512 , 2015-05
ISSN:02365731
NCID:AA11120189
Description
It is important that the contribution ratio of natural radioactivity to ambient dose rate in air is clarified after the accident at the Fukushima Daiichi Nuclear Power Plant. In this study, ambient dose rates in air were observed at 34 places in eastern Japan and the contribution ratios were clarified. The mean contribution ratio of the natural radionuclides was 71% (range: 0–100%). In most places, the natural radionuclides made a larger contribution to the ambient dose rate in air.
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