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22 June, 13:14

A researcher measures 200 counts per minute coming from a radioactive source at noon. At 3:00pm, she finds that this has dropped to 25 counts per minute. What percentage of the original source will remain at 6:00pm?

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  1. 22 June, 13:20
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    1.56% 1/8 of the original source (25 counts) remains at 3:00pm. This means that the half-life is 1 hour. Continue to find the fraction at 6:00pm.
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