放ほう射しゃ性せい元げん素そほうしゃせいげんそじ字FuriganaMeanings1nounradioactive element; radioelementphysics›Physics term for an element whose atoms have unstable nuclei and emit radiation.ウランは代だい表ひょう的てきな放ほう射しゃ性せい元げん素そです
