[time-nuts] Disciplining Rubidium

Bruce Griffiths 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..
> bye,
> 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.


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