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October 22, 2014

Homework Help: Calculus

Posted by Brittany on Thursday, January 13, 2011 at 8:30pm.

The half-life of radioactive strontium-90 is approximately 31 years. In 1960, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it take until only 11 percent of the original amount absorbed remains?

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