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Re: AW: Xenolite Protective clothing
I know. I was referring to the determination of
shielding efficency. The amount to tungsten needed
to provide the same as lead would be less than for
better titianium. Actually, the best thing would
probably be iridium or osmium. Of course, you still
have problems with those pesky characteristic x-ray
emissions.
--- Ted de Castro <tdc@xrayted.com> wrote:
> NOTE: the reference below refers to Titanium and NOT
> Tungsten - W is
> considerably higher density than lead.
>
> John Jacobus wrote:
> >
> > Technically, you can use any various materials to
> > provide shielding. Many are composites of more
> than
> > one. Tungsten is in "vogue" as it has become
> cheaper
> > due, I believe, to increased production by the
> > Chinese. However, you have to make up the
> attenuation
> > properties of lead with more of the material.
> > http://hps.org/publicinformation/ate/q1742.html
> >
> > Again, the advantage of using non-lead aprons,
> gloves,
> > etc., is the generation of non-hazardous waste.
> There
> > is a disposal concern with lead, not barium.
> >
> > --- Franz Schönhofer <franz.schoenhofer@chello.at>
> > wrote:
> >
> > > Dear Ed, dear John,
> > >
> > > I do not know for sure, whether lead aprons
> should
> > > be replaced by other
> > > materials, the only reason I can think of, is
> that
> > > "lead" is toxic.
> > >
> > > So is barium! "Barium" is a metal, which would
> react
> > > probably violently
> > > with oxigen and water. I would believe that
> barium
> > > sulphate might be
> > > used in whatever matrix. I cannot believe that
> its
> > > use in aprons would
> > > be comparable to lead. Tungsten (Wolfram in
> German)
> > > has a high
> > > absorption possibility, is (has been) used in
> > > weapons for high
> > > penetration capability just as depleted uranium.
> I
> > > guess that tungsten
> > > will be much more expensive than lead and its
> > > shielding efficiency would
> > > be considerably less than for lead.
> > >
> > >
> > > So why should one replace the good old lead
> aprons
> > > with less efficient
> > > and similarily "poisonous" materials?
> > >
> > >
> > >
> > > Franz Schoenhofer
> > > PhD, MR iR
> > > Habicherg. 31/7
> > > A-1160 Vienna
> > > AUSTRIA
> > > phone -43-0699-1168-1319
> > >
> > >
> >
>
--------------------------------------------------------------------
> > >
> > > > -----Ursprüngliche Nachricht-----
> > > > Von: owner-radsafe@list.vanderbilt.edu
> > > [mailto:owner-
> > > > radsafe@list.vanderbilt.edu] Im Auftrag von
> John
> > > Jacobus
> > > > Gesendet: Freitag, 03. Dezember 2004 00:17
> > > > An: Baratta, Edmond J;
> radsafe@list.vanderbilt.edu
> > > > Betreff: Re: Xenolite Protective clothing
> > > >
> > > > The material is made from barium and wolfram
> > > > (tungsten)
> > > >
> > > > http://www.scanrad.no/Xenolite.htm
> > > >
> > > > Also, try
> > > >
> http://www.apc-cardiovascular.co.uk/xenolite.htm
> > > >
> > > >
> > > > --- "Baratta, Edmond J" <EBARATTA@ORA.FDA.GOV>
> > > wrote:
> > > >
> > > > > Does anyone have any information about
> Xenolite
> > > > > Protective clothing It
> > > > > supposedly is used to replace lead aprons
> and
> > > other
> > > > > protective clothing.
> > > > >
> > > > >
> > > > >
> > > > > Thanks,
> > > > >
> > > > >
> > > > >
> > > > > Ed
> > > > >
> > > > >
> > > > >
> > > > > Edmond J. Baratta
> > > > >
> > > > > Radiation Safety Officer
> > > > >
> > > > > Tel. No. 781-729-5700, ext 728
> > > > >
> > > > > FAX: 781-729-3593
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > > =====
> > > > +++++++++++++++++++
> > > > "That government is the strongest of which
> every
> > > man feels himself a
> > > > part."
> > > > Thomas Jefferson
> > > >
> > > > -- John
> > > > John Jacobus, MS
> > > > Certified Health Physicist
> > > > e-mail: crispy_bird@yahoo.com
> > > >
> > > >
> __________________________________________________
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> >
> > =====
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> > "That government is the strongest of which every
> man feels himself a part."
> > Thomas Jefferson
> >
> > -- John
> > John Jacobus, MS
> > Certified Health Physicist
> > e-mail: crispy_bird@yahoo.com
> >
> >
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=====
+++++++++++++++++++
"Ancient Rome declined because it had a Senate; now what's going to happen to us with both a Senate and a House?"
Will Rogers
-- John
John Jacobus, MS
Certified Health Physicist
e-mail: crispy_bird@yahoo.com
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