Posted by Anonymous on Thursday, May 3, 2012 at 8:04pm.
300 = 600e^-.00043t
1/2 = e^-.00043t
-ln2 = -.00043t
t = 1612
so, after 1612 years, half is gone. That's the half-life.
Check: web search reveals a half-life of 1600 years or so.
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