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レイドン — radon (English)
A radioactive gaseous element emitted naturally from rocks and minerals where radioactive elements are present. It is released in non-coal mines, e.g. tin, iron, fluorspar, uranium. Radon is an alpha particle emitter as are its decay products and has been indicted as a cause of excessive occurrence of lung cancer in uranium miners. Concern has been expressed at radon levels in some housing usually adjacent to granite rocks or old tin mining regions. (Source: PORT)

The original Japanese definition:

レイドン (Japanese)
元素記号 Rn、原子番号 86 の元素。放射性のある気体。放射性の鉱石から採取される。錫、鉄、ホタル石、ウランなどの炭を含まない鉱脈から見つかる。ラドンは崩壊時にα粒子を放出し、ウラン鉱山労働者の肺ガンの原因とされている。

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