[Sneap] He-3

[Walter Augustyniak]

Paul,
    He-3 suppliers dwell on the purity of this isotope. If you could 
tolerate the presence of He-4, you should be able to get lower percentage 
He-3 to He-4 at a much reduced price. What surprized me when we, at 
Vanderbilt, were in the process of ordering this gas, that the percentage of 
gases other than He was the same for all grades of 3-He. We didn't care if 
there was 5% He-4 in the mixture, as long as the other common gases were 
absent.
    Hope this helps.

    Walt Augustyniak

----- Original Message ----- 
From: "Paul Barker" <p.barker at auckland.ac.nz>
To: "sneap" <sneap at tunl.duke.edu>
Sent: Thursday, May 08, 2008 1:03 AM
Subject: [Sneap] He-3


> The host for the 2008 SNEAP annual meeting is the University of Michigan 
> at Ann Arbor.  The meeting dates are: October: 12 - 17, 2008.
> The meeting web link is: 
> http://www-ners.engin.umich.edu/research/Mibl/Sneap/2008.htm
>
> Sneapers,
> I need a He-3 beam, and so need some He-3 gas to use in the ion
> source. A quote from Chemgas (around 3500Euro for 20
> atmosphere-litres) was more than I could afford. Does anyone have an
> idea about a cheaper provider ? Can one obtain it "secondhand", i.e.
> essentially lying around, unused ? I have had some success buying NIM
> and Camac electronic modules from a secondary supplier, so maybe it's
> possible
> Thanks,
> Paul Barker
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