最終更新日：2024/07/28

Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.

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radioactivity

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元となった辞書の項目

radioactivity

The radioactivity of the substance was measured using a Geiger counter.

意味（1）

意味（2）

The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc.