RE: scale source

["Edwards, Richard W" <Richard.Edwards@PSS.Boeing.com>]

Every Po-210 source I've ever come across is just that...Po-210, not Pb-210 with progeny.

Rick Edwards, Analyst
The Boeing Company
richard.w.edwards@boeing.com

> ----------
> Subject: 	RE: scale source
> 
> Po-210 half life is 138 days, so about 50 half lives have passed. It must be
> a Pb-210 source if it is of the radium decay chain and still has activity.
> 
> Are sources labeled Po-210 REALLY Pb-210?
> 
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