…In Peru, a significant number of people live at an altitude of 4,300 m, where the annual cosmic radiation dose is 200 mrad. Natural radioactive materials include cosmogenic radionuclides produced by cosmic rays, and terrestrial radionuclides that were taken into the Earth when it was formed and have been retained to this day. The former are produced by the action of cosmic rays on the nuclei of nitrogen and oxygen in the atmosphere, and 14 C, 3 H, 7 Be, etc. are important in terms of sources of human exposure. … *Some of the terminology that refers to "cosmogenic radionuclides" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…ペルーでは4300mの所に相当数の人間が住んでいて,そこでは宇宙線線量は年間200ミリラドとなる。自然放射性物質には,宇宙線によって生成される宇宙線生成放射性核種と,地球が形成されたとき地球に取り込まれ現在まで保持されている地球起源放射性核種とがある。前者は大気中の窒素や酸素の核に宇宙線が作用し生成されるもので,人体への被曝源の観点からは14C,3H,7Beなどが重要である。… ※「宇宙線生成放射性核種」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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