母ぼ核かく

noun

mother nucleus; parent nucleus

Technical term in nuclear physics and radiochemistry for the original radioactive nucleus before decay.

• 放ほう射しゃ性せい崩ほう壊かいでは、母ぼ核かくが娘じょう核かくに変かわる。

  In radioactive decay, the mother nucleus transforms into a daughter nucleus.