放ほう射しゃ性せい崩ほう壊かい

noun

radioactive decay

Scientific term for the process by which an unstable atomic nucleus loses energy by emitting radiation.

• ウランは放ほう射しゃ性せい崩ほう壊かいによって最さい終しゅう的てきに鉛なまりになる。

  Uranium eventually becomes lead through radioactive decay.