ほうしゃのうせん 放射能汚染
1. radioactive contamination
Wikipedia definition
2. Radioactive contamination]] Radioactive contamination, also called radiological contamination, is radioactive substances on surfaces, or within solids, liquids or gases (including the human body), where their presence is unintended or undesirable, or the process giving rise to their presence in such places. Also used less formally to refer to a quantity, namely the activity on a surface (or on a unit area of a surface).
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