4. 500 mCi sample of radioisotope was purchased by a medical supply house. If the sample has the half-life of 15 days. How long will it keep before it's activity is reduced to 25 mCi ?

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4. 500 mCi sample of radioisotope was purchased by a medical supply house. If the
sample has the half-life of 15 days. How long will it keep before it's activity is
reduced to 25 mCi ?
Transcribed Image Text:4. 500 mCi sample of radioisotope was purchased by a medical supply house. If the sample has the half-life of 15 days. How long will it keep before it's activity is reduced to 25 mCi ?
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