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Carbon-11 Radioactively Decays by Positron Emission with a Half-Life of 20.4

Question 35

Multiple Choice

Carbon-11 radioactively decays by positron emission with a half-life of 20.4 minutes. If a dosage of carbon-11 is administered to a patient for a PET scan, what percentage of carbon-11 will remain in the patient's system after 61.2 min?


A) 75.0%
B) 12.5%
C) 87.5%
D) 25.0%
E) 50.0%

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