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December 20, 2014

December 20, 2014

Posted by **Amy** on Thursday, February 17, 2011 at 5:12pm.

The half-life of the radioactive isotope gallium-70 is 20 minutes. If the initial amount of gallium-70 is 25 milligrams, when will 10 milligrams be left?

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**Reiny**, Thursday, February 17, 2011 at 7:58pmhere is your same question answered.

http://www.jiskha.com/display.cgi?id=1297973911

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