Question: The decay chain 139Cs 139Ba 139La is observed from an initially pure sample of 1 mCi of 139Cs. The half-lives are: 9.5 min

The decay chain 139Cs → 139Ba → 139La is observed from an initially pure sample of 1 mCi of 139Cs. The half-lives are: 9.5 min for 139Cs, and 82.9 min for 139Ba, and 139La is stable. What is the maximum 139Ba activity and when does it occur?

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