Phosphorus-32 is a radioactive isotope used as a tracer in the liver. How much phosphorus-32 was originally used if there is only 3.50 mg left in a sample after 288 h? (The half-life of phosphorus-32 is 14.3 days.)
A) 1.96 mg
B) 6.26 mg
C) 4.17 mg
D) 7.00 mg
E) 17.9 mg
Correct Answer:
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