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Re: Thinking About A Geiger Counter

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Subject: Re: Thinking About A Geiger Counter
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Date: Sat, 05 Nov 2005 15:45:38 -0700
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Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 11:35 AM 11/5/2005, Tesla list wrote:

Original poster: "Qndre Qndre" <qndre_encrypt@xxxxxxxxxxx>
There is not much mercury inside but there may be quite much argon inside. I don't know how "good" the vacuum has to be.

The vacuum has to be fairly good.. the mean free path has to be substantially longer than the path the electrons will take. say 1 milliTorr or less (5cm MFP) (1 micron) for a cold cathode xray tube. You could probably just get there with a two stage rotary pump in good shape. Pseudospark apparatus and Zpinch is also in this region

Real X-ray tubes are down below 1E-6 Torr.. "real" high vacuum pumps are needed: diff, turbo, ion, sorption, etc.

http://www.belljar.net/ has many answers on vacuum.

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