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The activity of a radioactive isotope is the number of nuclei in the isotope that disintegrate per second.
The activity of an isotope is measured in becquerel (Bq). 1 Bq is 1 disintegration per second.
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More in Radioactivity
- Radioactive Change
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- Background Radiation
- Radioactive Decay and Half-life
- Radioactive Decay
- Decay Constant
- Radiocarbon dating
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All 25 lessons in Radioactivity · All AQA A-level Physics topics