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自然放射線
1. background radiation
2. Background radiationBackground radiation is the ionizing radiation constantly present in the natural environment of the Earth, which is emitted by natural and artificial sources.
Read “Background radiation” on English Wikipedia
Read “自然放射線” on Japanese Wikipedia
Read “Background radiation” on DBpedia
Read “Background radiation” on English Wikipedia
Read “自然放射線” on Japanese Wikipedia
Read “Background radiation” on DBpedia
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