Re: H-3

[don@radpro.uchicago.edu]

You might give teflon tubing a try.  It is, obviously, much more inert than
Tygon.  Since you are apparently able to wipe the H-3 off rather easily, I
suspect that physical adsorbtion or diffusion _into_ the plastic is more of
a problem than replacement of H-1 by H-3.   Teflon tubing is not quite as
flexible as Tygon, but will probably suit your needs.

___________________________________________________________________

Don Jordan                          Tel. (312) 702-6299
Office of Radiation Safety          Fax        702-4008
The University of Chicago           email: don@radpro.uchicago.edu
1101 East 57th Street, Room 11
Chicago, Illinois  60637  
                -- Any opinions are the author's --