Answered: 9. [Essay] A sample of the isotope 131,… | bartleby

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9. [Essay] A sample of the isotope 131,
which has a half-life of 8.04 days, has an
activity of 5.0 mCi at the time of shipment.
Upon receipt of the sample at a medical
laboratory, the activity is 2.1 mCi. How
much time has elapsed between the two
measurements?

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