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December 20, 2014

December 20, 2014

Posted by **lan** on Thursday, November 29, 2012 at 3:43pm.

- earth science -
**Steve**, Thursday, November 29, 2012 at 3:53pmthe amount left after t days is

220 (1/2)^(t/24)

so,

220(1/2)^(168/24) = 1.718g

168 days is 7 half-lives, so 1/128 remains.

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