¹³¹I,which Has a Half- Life Time of 8 Days,is Used

¹³¹I,which has a half- life time of 8 days,is used in nuclear medicine to monitor the hormone production in the thyroid in a patient.A sample of ¹³¹I containing 5 * 10¹⁰ atoms is produced in a nuclear reactor.Due to the short half- life time,the sample emits less radiation with time.However,it is usable as long as there are at least 1.25 * 10^{10 131}I atoms present.What is the maximum time before the sample is no longer usable?

A) 16 days
B) 12 days
C) 8 days
D) 6 days

Correct Answer:

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