A drug has a half-life of 6 hours. The drug is administered by I/V injection, and immediately after administration its plasma level is 136mcg/ml. Results for a blood test later on show a plasma level of 8.55mcg/ml. How many half-lives have passed?

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Chapter32: Medical Applications Of Nuclear Physics
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Problem 13PE: A plumber at a nuclear power plant receives a whole—body dose of 30 mSv in 15 minutes while...
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9)A drug has a half-life of 6 hours. The drug is administered by I/V injection, and
immediately after administration its plasma level is 136mcg/ml. Results for a blood
test later on show a plasma level of 8.55mcg/ml.
How many half-lives have passed?

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