A 115 mCi radioactive tracer is made in a reactor. When delivered to a hospital

Question

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) 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)

Explanation / Answer

95=115(1-e^-16k) find K from the equation and half life is ln2/k

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