Inquiry response from LND - 3He tube

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Richard Hull
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Inquiry response from LND - 3He tube

Post by Richard Hull » Thu Apr 28, 2011 7:23 pm

I just received a Quote from LND for their 2528 3He tube. I was just testing the waters, as it were.

With a 120 day lead time, $2500.00

This tube has a small active area of only 8" and is a standard 4 atm tube. This points out the shortage issue on 3He. Don't get me wrong, this is a great detector, but gone are the days when you could call up Don Orie and get a long 21" active area tube at 4 atm used, but fully warranted and in good shape for $300.00.

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Re: Inquiry response from LND - 3He tube

Post by Edward Miller » Thu Apr 28, 2011 8:52 pm

I got a quote from LND on a few different 3He tubes in Oct 09.
252 $1875
253 $6800
252108 $4085

I only need a 3He or BF3 tube for an experiment that will only take a week. Is there anyone that rents (or on this board that would be willing to rent) a tube and controller (MCA)?

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Re: Inquiry response from LND - 3He tube

Post by Tyler Christensen » Thu Apr 28, 2011 9:51 pm

Just over a year ago (mid march) when i got my 23" 4atm Reuter-Stokes He3 tube, I checked with a contact at LND out of curiousity to what it's retail value is, and he said it would be $1000-2000 (although not an official quote). Sounds like they've gone up dramatically in the last year alone.

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Re: Inquiry response from LND - 3He tube

Post by Carl Willis » Fri Apr 29, 2011 12:12 am

Ouch...that's a sobering price.

Fission chambers have come up on eBay two times in the last decade that I am aware of. The main draw is the huge signal-to-noise advantage over every other kind of detector. Gamma response is never a problem when you have ~80+ MeV of deposited energy in the tube volume every time a neutron is detected. Efficiency is typically inferior to He-3 or BF3 tubes though. Disadvantages include the licensing requirement and the high street price of weapons-grade uranium. The possessor legally must have a special nuclear material license from the NRC; using or dealing in SNM without a license is like driving your car without a license--it's very serious and you might spend a night (or two) in jail.

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Re: Inquiry response from LND - 3He tube

Post by George Schmermund » Fri Apr 29, 2011 1:13 am

As long as we're on the subject I thought I'd add to the fray. Here's a quote that I got from LND last month.
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LND He3.doc
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Anything obvious in high vacuum is probably wrong.

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Re: Inquiry response from LND - 3He tube

Post by Steven Sesselmann » Fri Apr 29, 2011 3:14 am

Richards quote looks like a bargain...

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Re: Inquiry response from LND - 3He tube

Post by Richard Hull » Fri Apr 29, 2011 8:41 pm

George's quoted 25 kilobuck, #25384 LND tube is basically 3 ATM of the rare He3 in a "log". Pretty extreme and a dream tube, to be sure. The rule here is; only the "well-heeled" need apply.

Richard Hull
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Re: Inquiry response from LND - 3He tube

Post by George Schmermund » Mon May 09, 2011 8:36 pm

I should have ordered one of these while the price was still reasonable!
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LND He3 (2).doc
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Re: Inquiry response from LND - 3He tube

Post by Steven Sesselmann » Tue May 10, 2011 12:09 am

At the rate these things are going up in price it will soon be viable to manufacture He3 in a fusor

Say 1 Kwh electricity costs $0.25 that should yield at least 3.6e11 He3 atoms

25000 / 0.25 = 100,000 hours should yield 3.6e16 atoms.

Hmmm.. that would still be a pretty small tube.

Steven
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Re: Inquiry response from LND - 3He tube

Post by jcs78227 » Tue May 10, 2011 2:09 am

Gone indeed...current U.S. prices are "set at $600/L for govt. users and $1000/L for commercial users."

The U.S. is scrambling for methods to recover more 3He from existing tritium stockpiles.

Attached is a decent article on recent developments.

-J
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He-3_Supply_Article.pdf
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