(Answered) A radioactive isotope has a half life of 432 minutes how

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A radioactive isotope has a half life of 43.2 minutes. How long will it take for the radiation from a 580 pCi sample to decrease to 290 pCi?

A radioactive isotope has a half life of 13.6 minutes. How long will it take for the radiation from a 450 pCi sample to decrease to 113 pCi?

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