RE: Give Me You Opinion

["Richards, David" <david.richards@rfets.gov>]

It has always been my understanding that Teflon was invented as a liner for
sewers in New Jersey to prevent plugging. I'm sure that I've seen/read
DuPont ads that make this assertion.

DJ Richards
Hazards Assessment Team Leader
  & Y2k Emergency Preparedness Lead
Rocky Flats Environmental Technology Site
David.Richards@rfets.gov
djrichards@earthlink.net


> -----Original Message-----
> From:	Scott D Kniffin
> [SMTP:Scott.D.Kniffin.1%gsfc.nasa.gov@inet.rfets.gov]
> Sent:	Wednesday, January 27, 1999 9:56 AM
> To:	Multiple recipients of list
> Subject:	Re: Give Me You Opinion
> 
> Mike, 
> 
> Yes the fluorine aspect is the problem for UF6.  I had a professor at U of
> Maryland that inhaled some at Oak Ridge in his youth and his voice sounded
> gravely and hoarse all the time from it.  Nasty corrosive stuff.  Rumor
> has
> it that Teflon was invented/discovered/figured-out-to-be-excellent for
> dealing with UF6 because it ate at the plumbing of the permeable membrane
> gas separators in the early enrichment work.  Anyone out there know the
> answer to this?  I've always wondered.  
> 
> Scott Kniffin
> 
> RSO Unisys Federal Systems, Lanham, MD
> CHO Radiation Effects Facility, GSFC, NASA
> mailto:Scott.D.Kniffin.1@gsfc.nasa.gov
> 
> The opinions expressed here are my own. They do not necessarily represent
> the views of Unisys or NASA.  This material has not been reviewed by my
> manager or NASA.  
> 
> At 10:19 01/27/99 -0600, you wrote:
> >I agree with your response.  I do have a question about the UF6. Are you
> >concerned about the fluorine aspect?  The specific activity of U238 is
> >180,000 times less than Pu 239.  Assuming its all U235, then were talking
> >28000 time lower SA.  The biological half lives are 9-15 DAYS for U and
> 200
> >YEARS for Pu.  Inhaled U is not a major threat.
> >
> >Of course my own opinion.
> >
> >Mike Dempsey
> >
> 
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