A 115 mci radioactive tracer is made in a reactor when, Ask an Expert

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A 115 mCi radioactive tracer is made in a reactor. When delivered to a hospital 16 hours later its activity is 95 mCi. The lowest usable activity level is 10 mCi.

a) What is the tracer's half-life? (in hours)

b) For how long after delivery is the sample usable? (in hours)

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