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April 28, 2015

Homework Help: Chemistry please help!

Posted by Mary on Saturday, February 9, 2008 at 7:49pm.

A Cesium 137 sample has a measured radioactivity of 50 microcuries.Cesium 137 has a half-life of 30 years.

How long will it take this sample to be reduced to a residual radioactivity of 6.25 microcuries?

Is there a formula to calculate half life?

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