How many half-lives would go by in 36 h

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Technetium-99 (half-life = 6.0 h) is used in medical imaging. How many half-lives would go by in 36 h?

How many half-lives would have to elapse for a sample of a radioactive isotope to decrease from an activity of 160 cpm to an activity of 5 cpm?

Reference no: EM131238131

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