Question: A 5 0 0 0 - Ci 6 0 Co source is used for cancer therapy. After how many years does its activity fall below

A 5000-Ci 60Co source is used for cancer therapy. After howmany years does its activity fall below 3.98x 103 Ci? The half-life for 60Co is 5.2714 years. Your answer should be a number with two decimal points.

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