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?
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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![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?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4f0152cc-7a39-41b9-a5ca-1627eec82c0c%2F2fa4412d-3646-4ecb-a193-94a1ac04e598%2Fc1etacr.jpeg&w=3840&q=75)
Transcribed Image Text: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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