Jisho

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ほうしゃせいこうかぶつ 放射性降下物
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Noun
1. radioactive fallout​
Wikipedia definition
2. Nuclear fallout​Fallout is the residual radioactive material propelled into the upper atmosphere following a nuclear blast or a nuclear reaction conducted in an unshielded facility, so called because it "falls out" of the sky after the explosion and shock wave have passed. It commonly refers to the radioactive dust and ash created when a nuclear weapon explodes, but this dust can also be originated in a damaged nuclear plant.
Read “Nuclear fallout” on English Wikipedia
Read “放射性降下物” on Japanese Wikipedia
Read “Nuclear fallout” on DBpedia

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