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しぜんほうしゃせん
Meanings
Noun
1. background radiation
Alt. forms
自し然ぜん放ほう射しゃ線せん
しぜんほうしゃせん
Composed of
Natur; natürlich; naturhaft; angeboren; instinktiv; spontan
Strahlung; radioaktive Strahlung