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error propagation for % enrichment

I am attempting to locate a reference that will
provide a method to propagate the error associated
with analytical results from isotopic uranium analysis
and determining percent enrichment.  To be a little
more specific; each uranium (U234/U235/U238)
analytical result has an associated error.  How do
account for this error in determining enrichment?  At
low U235 activity any error associated with the
analytical result significantly changes the percent
enrichment.

I have went through some old chemistry and statistic
books to develop an equation, just wondering if
something specific to this has already been utilized
or published.

Hans Honerlah
Health Physicist
USACE 


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