A thyroid cancer patient is given a dosage of 131 I(half-life = 8.1 d). What fra

Question

A thyroid cancer patient is given a dosage of 131I(half-life = 8.1 d). What fraction of the dosage of 131Iwill still be in the patient's thyroid after 16.2 days?

Technetium-99 (half-life = 6.0 h) is used in medical imaging.How many half-lives would go by in 20.h?
half-lives
A thyroid cancer patient is given a dosage of 131I(half-life = 8.1 d). What fraction of the dosage of 131Iwill still be in the patient's thyroid after 16.2 days?

Technetium-99 (half-life = 6.0 h) is used in medical imaging.How many half-lives would go by in 20.h?
half-lives

Explanation / Answer

For the first question, you'll notice that 16.2 days is exactly 2half lives, so that means that (1/2)2 of the dosageremains, or 1/4 Second question-- 6hr=1HL [Half-life] 20hr(1HL/6hr) = 3.3 HL [Just think of it as astoichiometry problem]

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