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The half-life of 60Co is 5.27 years. The activity of a 60Co sample is 0.0946 µCi....

The half-life of 60Co is 5.27 years. The activity of a 60Co sample is 0.0946 µCi.

(a) What is the mass of the sample?

(b) What is the activity of the sample after 20 years?

(c) If background readings in the lab are ∼ 45 counts per minute, should we keep that 60Co disk or throw it away?

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