Half life of cobalt-60: September 2011
Correct Answer: 5.3 years
Description: Ans. C: 5.3 years Half life of cobalt-60 is 5.3 years, therefore in practice have to replaced every 3-4 years Half-lives of impoant isotopes: 1-131: 8 days Rn 222: 3-6 days Co 60: 5.2 years
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