[time-nuts] Disciplining Rubidium
Bruce Griffiths
bruce.griffiths at xtra.co.nz
Thu Apr 24 06:08:18 UTC 2008
SAIDJACK at aol.com wrote:
> Hi Tom,
>
> by the way, are Cesium and Rb isotopes used in these clocks radioactive to
> any degree? I remember on your website you mentioned that Cesiums have to be
> shipped as hazardous material..
>
> bye,
> Said
>
>
Said
Both Caesium and Rubidium are chemically reactive alkali metals.
Cs133, Rb85 are all stable isotopes
Rb87 decays via beta emission with a half life of about 5E10 years.
Bruce
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