A 5000-Ci 60Co source used for cancer therapy is considered too weak to be useful when its activity falls to 3500 Ci. How long after its manufacture does this happen? The isotope half- life is 5.27 years.
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15. A 5000-Ci 60Co source used for cancer therapy is considered too weak to be useful when
its activity falls to 3500 Ci. How long after its manufacture does this happen? The isotope half-
life is 5.27 years.
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