A 135 mci radioactive tracer is made in a nuclear reactor


A 135 mCi radioactive tracer is made in a nuclear reactor. When it is delivered to a hospital 18 hours later its activity is 85 mCi. The lowest usable level of activity is 10 mCi.

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

h

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

h

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Physics: A 135 mci radioactive tracer is made in a nuclear reactor
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