[ RadSafe ] Europium-152 identified instead of Bismuth-214

Michael McNaughton mcnaught at lanl.gov
Tue Mar 24 11:21:28 CDT 2009

My apologies; yes, I meant Eu-152.

At 10:04 AM 3/24/2009, edmond0033 at comcast.net wrote:

>I believe you meant Eu-152.
>Ed Baratta
><mailto:edmond0033 at comcast.net>edmond0033 at comcast.net
>----- Original Message -----
>From: "Michael McNaughton" <mcnaught at lanl.gov>
>To: radsafe at radlab.nl
>Sent: Tuesday, March 24, 2009 11:58:16 AM GMT -05:00 US/Canada Eastern
>Subject: [ RadSafe ] Europium-252 identified instead of Bismuth-214
>Dear Radsafers
>I have some soil samples for which I think Bismuth-214 is incorrectly
>identified as Europium-252. Is this a well-known problem?
>The gamma-spec software found a small peak near 1408 keV and reported
>it as 0.4 pCi/g of Europium-252, though it did not find any other
>Europium-252 peaks. The sample contains about 3 pCi/g of Bismuth-214,
>and has large peaks at 609 keV, 1120 keV, and 1765 keV, so I think
>the small peak at 1408 keV is probably from Bismuth 214. The relative
>sizes of the peaks correspond to the relative probabilities of decay
>for Bismuth-214.
>I would be interested in discussing this problem with gamma-spec experts.
>Thanks, mike
>Mike McNaughton
>Los Alamos National Lab.
>email: mcnaught at LANL.gov or mcnaughton at LANL.gov
>phone: 505-667-6130; page: 505-664-7733

Mike McNaughton
Los Alamos National Lab.
email: mcnaught at LANL.gov or mcnaughton at LANL.gov
phone: 505-667-6130; page: 505-664-7733 

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