[time-nuts] Disciplining Rubidium

[SAIDJACK at aol.com]

Hi Bruce,
 
last chemistry/physics class is a while back :) I guess a half life of 50  
Billion years means it's not really radiating much?
 
No problem with Cesium then either, I guess the radiation levels must be  
really really low?
 
thanks,
Said
 
 
In a message dated 4/23/2008 23:09:24 Pacific Daylight Time,  
bruce.griffiths at xtra.co.nz writes:

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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