Re: Unknown Sealed Sources

["Ron L. Kathren" <rkathren@beta.tricity.wsu.edu>]

Mr. Cappas --

RaD+E is the historical name for Pb-210 and Bi-211.  The source is Pb-210 
in equilibrium (secular) with Bi-210, and thus includes the betas from 
both nuclides.

Ron Kathren

On Wed, 23 Aug 1995, Cappas, Mike wrote:

> We have two sealed sources that are labeled Ra-DE. Does anyone know what the DE
> stands for.
> 
> Some background information:
> They are part of a Beta Source Set sold by Don L. Collins & Assoc. of Glendale,
> CA (1979). Both sources are red-colored, half-disks, which make a 1-inch disk
> when placed side-by-side. They are not labeled with any activity (only Ra-DE),
> but are definitely radioactive (Ra-226, I assume).
> 
> I tried contacting Don L. Collins & Assoc., but they do not seem to exist any
> more.
> 
> Any help would be greatly appreciated. Thanks...
> 
> Michael Cappas
> cappas@mdaw.mdc.com
> 
> McDonnell Douglas Aerospace
> Space & Defense Systems
> Huntington Beach, CA
> 
>