AW: [ RadSafe ] Re: radioactive contamination of silver

[Franz Schönhofer]

Thank you John for posting basic knowledge on Pb-210 - Po-210, which I
very well know, but might be of interest of other RADSAFErs. I thought
that those participating in this thread would have a basic understanding
of radioactive equilibria, especially regarding naturally occurring
radionuclides. I would have appreciated to find an explanation how
Po-210 could survive melting processes, but you ignore my request. Your
message contains a lot of typing errors. 

Please try again to answer my question and not to distribute commonplace
information about naturally occurring radionuclides. 

Franz


Franz Schoenhofer
PhD, MR iR
Habicherg. 31/7
A-1160 Vienna
AUSTRIA
phone -43-0699-1168-1319


> -----Ursprüngliche Nachricht-----
> Von: John R Johnson [mailto:idias at interchange.ubc.ca]
> Gesendet: Samstag, 26. März 2005 00:51
> An: Franz Schönhofer; sontermj at tpg.com.au; radsafe at radlab.nl
> Betreff: RE: [ RadSafe ] Re: radioactive contamination of silver
> 
> Franz et al
> 
> Po-210 is a progeny of Pb-10; ie Pb-10 (halflife 21 years)-> Bi-
> 210(halflife
> 5.01 days)-> Po-210(halflife 138.4 days).
> 
> Pb-210 is a progeny of U-Nat and is in most ores.
> 
> Unless all lead was removed the Po-210 will keep "growing in".
> 
> Have a pleasant Easter.
> 
> John
>  _________________
> John R Johnson, Ph.D.
> *****
> President, IDIAS, Inc
> 4535 West 9-Th Ave
> Vancouver B. C.
> V6R 2E2
> (604) 222-9840
> idias at interchange.ubc.ca
> *****
> or most mornings
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> 
> -----Original Message-----
> From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl]On
> Behalf Of Franz Schönhofer
> Sent: March 25, 2005 2:08 PM
> To: sontermj at tpg.com.au; radsafe at radlab.nl
> Subject: AW: [ RadSafe ] Re: radioactive contamination of silver
> 
> 
> Mark and RADSAFErs,
> 
> That Po-210 must be present in ores of Cu-U-Au-Ag mining is not
> surprising. That the various procedures of refining of gold, silver
and
> electrolytic refinement of copper which involves several meltings and
> electrotechnical processes would not remove Po-210 is more than
> surprising. A very common method to separate and determine Po-210 is
> based on the volatilisation of Po-210. Therefore I draw the conclusion
> that traditional methods for silver production should simply by the
fact
> of melting remove any contamination attributable to Po-210.
> 
> I am of course open to any explanation showing that this is not the
> case.
> 
> Franz
> 
> Franz Schoenhofer
> PhD, MR iR
> Habicherg. 31/7
> A-1160 Vienna
> AUSTRIA
> phone -43-0699-1168-1319
> 
> 
> > -----Ursprüngliche Nachricht-----
> > Von: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] Im
> > Auftrag von sontermj at tpg.com.au
> > Gesendet: Freitag, 25. März 2005 11:51
> > An: radsafe at radlab.nl
> > Betreff: [ RadSafe ] Re: radioactive contamination of silver
> >
> > Regarding the thread on contamination of silver:
> >
> > Can I suggest that an often-unrecognised pathway for silver to get
> > contaminated with radionuclides is from
> > usually-tiny amounts of NORM in the silver ore that can carry over
> into
> > the final refinery process.  At a
> > Copper-Uranium-Gold-Silver mining and processing facility where I
was
> once
> > the RSO, we had to hold
> > back the initial silver shipments because we had found unexpected
> Po-210
> > contamination in it (and Kodak
> > didnt want it!).  We made adjustments to the metallurgical process
to
> > reduce this carry over.
> >
> > Mark Sonter
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