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Title :Japanese population dose from natural radiation
Authors :Omori, Yasutaka
Hosoda, Masahiro
Takahashi, Fumiaki
Sanada, Tetsuya
Hirao, Shigekazu
Ono, Koji
Furukawa, Masahide
Issue Date :14-Aug-2020
Abstract :The radiation doses from natural radiation sources in Japan are reviewed using the latest knowledge. The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) and the Nuclear Safety Research Association report the annual effective doses from cosmic rays, terrestrial radiation, inhalation, and ingestion as natural sources. In this paper, the total annual effective dose from cosmic-ray exposure is evaluated as 0.29 mSv. The arithmetic mean of the annual effective dose from external exposure to terrestrial radiation is 0.33 mSv for the Japanese population using the data of nationwide surveys by the National Institute of Radiological Sciences. Previously in Japan, although three different groups have conducted nationwide indoor radon surveys using passive-type radon monitors, to date only the Japan Chemical Analysis Center (JCAC) has performed a nationwide radon survey using a unified method for radon measurements conducted indoor, outdoor, and in the workplace. Consequently, the JCAC results are used for the annual effective dose from radon and that for radon inhalation is estimated as 0.50 mSv using a current dose conversion factor. In this paper, UNSCEAR values are used for the mean indoor and outdoor thoron-progeny concentrations, and the annual effective dose from thoron is reported as 0.09 mSv. Thus, the annual effective dose from radon and thoron inhalation is 0.59 mSv. From a JCAC large-scale survey of foodstuffs, the committed effective dose from the main radionuclides in dietary intake is 0.99 mSv. Finally, the Japanese population dose from natural radiation is given as 2.2 mSv, which is similar to the reported global average of 2.4 mSv.
URL :https://doi.org/10.1088/1361-6498/ab73b1
Type Local :雑誌掲載論文
ISSN :0952-4746
1361-6498
Publisher :IOP Publishing
URI :http://hdl.handle.net/20.500.12000/47545
Citation :Journal of Radiological Protection Vol.40 no.3 p.R99 -R140
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Science)

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