[ RadSafe ] Pepto-Bismol
Bernard L. Cohen
blc+ at pitt.edu
Fri Dec 15 11:42:48 CST 2006
Many thanks. I get it now.
Michael McNaughton wrote:
> There is a series of stages, each of which enriches the uranium by a
> small step. The enrichment depends on the number of stages in the
> enrichment direction of the series; whereas the depletion depends on
> the number of stages in the depletion direction. The depletion series
> stops when the U-235/U238 is 0.002. In the other direction, the
> enrichment continues for as many stages are used, e.g., to >90%.
> At 12:24 PM 12/14/2006, Bernard L. Cohen wrote:
>> Natural uranium should have the same alpha activity from U-238 and
>> U-234 (they are in secular equilibrium).. The enrichment process
>> takes U-235 from 0.7% to about 3.5% so the DU should have 1/5 as much
>> U-235 as natural uranium. Enrichment shoud remove a somewhat larger
>> fraction of U-234 (it is lower in mass) than of U-235, so the U-234
>> alpha activity in DU should be somewhat less than 20% of that in
>> natural uranium. Even if it was 20%, it would be 0.2/ (1+0.2) = 17%
>> of the total alpha activity. How can it be as much as 28%?
> Mike McNaughton
> Los Alamos National Lab.
> email: mcnaught at LANL.gov or mcnaughton at LANL.gov
> phone: 505-667-6130; page: 505-664-7733
More information about the RadSafe