2. A patient is given an injection of P-32, and 2 ml blood samples are taken 24 hours and at 48 hours. Both samples were coun

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2. A patient is given an injection of P-32, and 2 ml blood samples are taken 24 hours and at 48 hours. Both samples were counted 50 hours after injection. The counting rate for the samples were 6820 and 3610 counts/min respectively, including a background of 120 counts/min. Calculate the biological half life. (12 pts)
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