A sample of isotope of 131 iodine half-life of 804 days has, Ask an Expert

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A sample of isotope of 131 Iodine (half-life of 8.04 days) has activity of 5.8 mCi at the time of shipment. Upon receipt of the sample at the medical laboratory, the activity of this sample is 2.2mCi. How much time has elapsed between the two measurements?

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