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Re: AW: Xenolite Protective clothing
Your reference is to the mineral xenolite,
http://www.mindat.org/min-4332.html
I was referring to the commerical product used in
shielding apparel, which has leaping radiographers,
http://www.scanrad.no/Xenolite.htm
--- Sam Iverstine <sam_iverstine@YAHOO.COM> wrote:
> Hi All,
> Al 10Si 8O 31
> the apparent formula for Xenolite, absorption
> coeficient for Al at 300 keV is 15 times less than
> Pb, and 7 times less than Pb at 500 keV; therefore
> at diagnostic ranges (<300 kVp), by extrapolation,
> Pb (88 keV, k-edge) becomes an even better absorber
> for lower energies. Al and Si have about equal
> electron densities, k-edges (1.6,1.8 keV), and
> densities. In other words, there appears to be no
> way around weight for absorption properties.
>
> Hope this helps the discussion along.
>
> Sam
>
> garyi@trinityphysics.com wrote:
> I could be wrong about this, but I believe that
> materials in non-lead aprons are selected
> for their absorption characteristics in energy
> ranges common to diagnostic imaging.
> The aim of this is to produce a lighter apron.
>
> -Gary Isenhower
>
>
> On 3 Dec 2004 at 5:22, 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
> > 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" > 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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"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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