You want to determine the blood volume of a live mouse. To do this, 0.10 mL of a

Question

You want to determine the blood volume of a live mouse. To do this, 0.10 mL of a saline suspension of red blood cells labeled with 59Fe is injected into the tail vein. Before injection, the 0.10 mL saline suspension had a count rate of 1.0 x 104 counts per minute (cpm). After sufficient time for the blood to be thoroughly mixed, 0.10 mL of blood was removed from the mouse and counted. The 0.10 mL blood sample was found to have a count rate of 476 cpm. What is the approximate blood volume of the mouse? Assume all of the injected 59Fe remains in the blood and no 59Fe has decayed (t1/2 = 44.51 days). (a) 0.48 mL (b) 21 mL (c) 4.8 mL (d) 4.7 mL (e) 2.1 mL I really need a explanation please! the answer is 2.1 ml, but i dont understand why

Explanation / Answer

2.1 mL

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