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Re: Abundance of 727 KeV Line in Bi-212
Go to http://www.nndc.bnl.gov/
and use NuDat, selecting Decay Radiations, and enter A and Z. You will like
the answer (recent ENSDF data) and the tool.
Regards,
Bob Hearn
rah@america.net
----- Original Message -----
From: "Leo M. Lowe" <llowe@senes.ca>
To: <radsafe@list.vanderbilt.edu>
Sent: Monday, July 28, 2003 12:10 PM
Subject: Abundance of 727 KeV Line in Bi-212
> Hello,
>
> In gamma spectroscopy analysis of samples containing natural thorium
> (Th-232), almost certainly in radioactive equilibrium, the concentration
of
> Bi-212 was much lower than expected (i.e. about 60% of the Th-232
> concentration). The Bi-212 concentration was based on an abundance of
> 11.8% (e.g. as given in ICRP 38) for the 727 KeV line. However, if the 7%
> abundance for this line as given in the Radiological Health Handbook were
> used, the Bi-212 concentration would be much closer to the equilibrium
> concentration (i.e. 7/11.8 = approx. 60%)
>
> A similar ratio (between ICRP 38 and the Radiological Health Handbook) was
> also found for the 1.62 MeV line, with reported abundances of 2.75% and
> 1.8%, respectively (i.e. 1.8/2.75 = approx 65%).
>
> What are the "accepted" abundances for the Bi-212 727 KeV and
> 1.62MeV lines? Has anyone else had this problem?
>
> If more appropriate, please feel free to respond to me directly. (I get
> Radsafe via Digest mode i.e. only once per day.)
>
> Thanks.
> Leo M. Lowe, Ph.D., P.Phys.
> Principal, Senior Health and
> Environmental Physicist
>
> SENES Consultants Limited
> 121 Granton Drive, Unit 12
> Richmond Hill, Ontario
> Canada L4B 3N4
> Tel: (905) 764-9380
> Fax: (905) 764-9386
> llowe@senes.ca
> www.senes.ca
>
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