1 文書を見つけるための辞書。

• radioactive decay, decay, disintegration
• 減衰, 崩潰, 壊変, 崩壊, 放射性崩壊
• the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
• 電離放射線の放出を伴う放射性物質の自発的崩壊