[ RadSafe ] 600 years

[Scott Davidson]

A billion.
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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