A sample of a radioactive substance used in detecting skin, Chemistry

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A sample of a radioactive substance used in detecting skin

A sample of a radioactive substance used in detecting skin cancer produced 592 counts in one minute at the beginning of a test and a count of 451 counts in one minute after one day. If the background counts-per-minute was 48, what is the half-life of this radioactive substance?

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Chemistry: A sample of a radioactive substance used in detecting skin

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