[time-nuts] Disciplining Rubidium
bruce.griffiths at xtra.co.nz
Thu Apr 24 02:08:18 EDT 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..
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.
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