Newsgroups: sci.physics.plasma
From news@news-2.ccinet.ab.ca Thu Dec 28 14:50:48 1995
From: Fred Zillinger <industro-serve@ccinet.ab.ca>
Subject: Geiger Tube Gases
Organization: CCI Networks, a division of Corporate Computers Inc.

We repair sensors that are used in oilwells logging.
Some of the older tools use makes of Geiger tubes that
are no longer available. The most common mode of failure
is degassing. We would like to repair these tubes ourselves
or have them repaired. These tubes are usually measuring
gamma radiation.

Does any one know the answer to any of the
following:

1. What gases are used in geiger tubes for downhole use?
2. And at what pressure?
3. Does anyone repair geiger tubes commercially?

We attempted using air at a partial vacuum. It worked, but not very well.
The temperature range that downhole tools operate in is 0 to 175 DEGC.
These tubes are typically 1 to 2 cm in diameter and operate at about 700 volts.

Any help would be appreciated.
_______________________________________________________

Fred Zillinger industro-serve@ccinet.ab.ca
Industro-Serve Inc. Phone: 403-342-1125
Red Deer, Alberta Fax: 403-343-0030
Canada, T4P 2K1
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