The activity of a radioactive source is measured in
Correct answer: A. becquerel
- A. becquerel
- B. gray
- C. sievert
- D. coulomb
Explanation
One becquerel is one disintegration per second, so it measures how fast the source is decaying. The gray measures absorbed dose in joules per kilogram and the sievert measures the biologically weighted equivalent dose, which is what radiation protection limits are quoted in. Keeping these three units apart is a common examination point.
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About Half-life and Rate of Decay
Half-life is the time required for half the unstable nuclei in a sample to decay, and it remains constant for a particular radioactive nuclide. Questions use the exponential decay law, decay constant, activity, remaining quantity and mean life. Radioactive decay is random for individual nuclei but predictable for large samples.
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