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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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Key terms in this lesson
- isotope
- An atom of the same element, with the same number of protons but a different number of neutrons.
More in Radioactivity
- Radioactive Change
- The Dangers of Radioactivity
- Background Radiation
- Radioactive Decay and Half-life
- Radioactive Decay
- Decay Constant
- Radiocarbon dating
- Argon Dating
All 25 lessons in Radioactivity · All OCR A-level Physics topics