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I need help with a question regarding the unit curie and half-lives!

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The unit curie is defined as a disintegration rate of 3.7 x 10^10 dis/s. What mass of 90Sr, with a half-life of 29 y, is required to produce 1.00 millicurie of radiation?

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@bjbaltze,

http://en.wikipedia.org/wiki/Curie

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