Radioactive Porcelain?

[Brian Rees <brees@lanl.gov>]

What might be found in some batches of new porcelain, particularly near
Eastern Europe?  The porcelain is not used, is fashioned into typical
fixtures, and not all batches are > bkgd (~ 2x bkgd).  I KNOW that taking a
sample or spec'ing a piece would give me the answer, that isn't an option
at present.  

While I'm looking for answers, what is purpose for U to be in dentures?
I've heard that it's for color, but recently heard that the U is to make
the denture harder.  What is it really?  

Brian Rees
brees@lanl.gov
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