[ RadSafe ] 600 years

Bjorn Cedervall bcradsafers at hotmail.com
Mon Sep 27 21:30:04 CDT 2010

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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