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Problem 1:   A 60Co source (which has a half-life of 5.2714 y) is labeled 4.00 mCi,...

Problem 1:   A 60Co source (which has a half-life of 5.2714 y) is labeled 4.00 mCi, but its present activity is found to be 1.7 × 107 Bq.

Part (a) What is the present activity in mCi?

Part (b) How long ago did it actually have a 4.00 mCi activity in years?
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