[ RadSafe ] Isotopic Concentrations of Uranium Versus U-235Enrichment

Brennan, Mike (DOH) Mike.Brennan at DOH.WA.GOV
Fri Dec 5 15:24:23 CST 2008

Here is a site that you might find useful:
http://www.iem-inc.com/toolspa.html It has the specific activities of
most isotopes one might be interested in.  When looking at enriched
uranium it is usually worth thinking about U-234, which in natural U is
trivial by weight but generally close to equal in activity with U-238.
As U-235 is enriched, U-234 is also enriched, which would cause activity
to increase faster than one would expect if just considering U-238 and

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
Behalf Of Leo M. Lowe - SENES Consultants Limited
Sent: Friday, December 05, 2008 12:29 PM
To: radsafe at radlab.nl
Subject: [ RadSafe ] Isotopic Concentrations of Uranium Versus


DOE-STD-1136-2004 (Guide of Good Practices for Occupational Radiological
Protection in Uranium Facilities) gives an equation for the specific
activity of uranium (Ci/g) as a function of U-235 
percent enrichment.   However, it does not provide a parameterization 
of the isotopic abundances. A graph (Figure 2-2) does show the percent
of the total activity for individual isotopes but I am interested in
equations for the abundances, rather than having to read values off the

Does anyone has a cite for this information  i.e. Bq/g or Ci/g for each
uranium isotope versus % U-235 mass enrichment (by the gaseous diffusion

Feel free to respond directly to me.


Leo M. Lowe, Ph.D., P.Phys.

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