Last Updated
：2025/11/20
radioactivity
Noun
uncountable
usually
Japanese Meaning
核反応や不安定な原子核の崩壊によって、自発的に電離放射線が放出される現象。
（ plural ）
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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
Scientists measured the radioactivity emitted from the damaged reactor to assess the danger.
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Scientists measured the radioactivity emitted from the damaged reactor to assess the danger.
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