... natural neutron 天然中子 natural radioactive 天然放射性的 natural radioactive element 天然放射性元素 ...
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关于天然放射性的成因 Origin of Natural Radioactivity
辐射来自于外层空间（宇宙射线），以及在土壤，水和空气中的天然放射性物质。
The radiation comes from space (cosmic rays) as well as natural radioactive materials found in the soil, water and air.
氡是一种天然产生的放射性惰性气体，它无色、无味、无臭。
Radon is a chemically inert, naturally occurring radioactive gas. It has no smell, colour or taste.
核能比天然气的污染少，但是成本太高，而且因为放射性废物处置存在的高度危险性而被美国上下置疑。
Nuclear energy is less polluting than gas from a climate-changing perspective, but it is costly and viewed skeptically in the United States because of the dangers of disposing of radioactive waste.
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