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How many milligrams of the radioisotope are still active

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Reference no: EM13167498

Fluorine-18, which has a half-life of 110 min, is used in PET scans. If 123 mg of fluorine-18 is shipped at 8:00 a.m., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 p.m.?

Reference no: EM13167498

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