Cobalt-60 is a beta emitter with a half-life of 5.3 years. Approximately what fraction of the cobalt-60 atoms in a particular sample will remain after 32 years

Name: Cobalt-60 is a beta emitter with a half-life of 5.3 years. Approximately what fraction of the cobalt-60 atoms in a particular sample will remain after 32 years
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Quizplus · Accepted Answer

The number of half-lives in 32 years is 32 / 5.3 ≈ 6. After 6 half-lives, the fraction remaining is (1/2)^6 = 1/64.

Cobalt-60 Is a Beta Emitter with a Half-Life of 5