Natural radiation

Japanese: natural radiation(英語表記)naturalradiation
Natural radiation

…All humans are exposed to environmental radiation to varying degrees, and personal control of exposure is more difficult than medical or occupational exposure. Environmental radiation comes from natural radiation, as well as artificial radiation from nuclear tests, nuclear fuel cycles such as nuclear power plants, and other miscellaneous sources. In terms of exposure pattern, there is external radiation, which comes from sources outside the human body, and internal radiation, which comes from taking in radioactive materials.

*Some terminology that mentions "natural radiation" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…すべての人間が程度の差こそあれ環境放射線に被曝(ひばく)しており,その被曝の個人管理は医療被曝や職業被曝に比し困難である。環境放射線はその線源に関して,自然放射線natural radiation,ならびに核実験,原子力発電所等核燃料サイクルおよびその他雑線源からの人工放射線artificial radiationがある。また,被曝様式と関連して,線源が人体外にある体外放射線と,放射性物質を体内に取り込むことによる体内放射線とがある。…

※「natural radiation」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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