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A Patient Is Injected with a 5

Question 88

Multiple Choice

A patient is injected with a 5.0 M solution of gallium citrate containing radioactive gallium-68 for a PET study. The half-life of gallium-68 is 9.4 hr. How long does it take for the activity of this isotope to drop to 1% of its initial value?


A) 18 hr
B) 25 hr
C) 32 hr
D) 41 hr
E) 62 hr

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