[ RadSafe ] 600 years
bsdnuke at gmail.com
Mon Sep 27 22:29:22 CDT 2010
On Sep 27, 2010 10:30 PM, "Bjorn Cedervall" <bcradsafers at hotmail.com> wrote:
> 600 years is about 20 half-lives of Cs-137 and Sr-90. This means that
their radioactivity levels have fallen by a factor of 1 million.
> Just a reflection.
> Bjorn Cedervall
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