3B Scientific Geiger-Muller Counter Tube - Manual

3B SCIENTIFIC ® PHYSICS
1
Geiger-Müller Counter Tube U8533430
Instruction sheet
07/07 SP/ALF
1
2
3 4
5
1 Handling
rod
2 BNC socket
3 Supporting clip
4 Housing
5 Protective
cap
1. Safety instructions
If too high a voltage is applied, the life of the counter
tube will be reduced and its characteristic curve will
be altered (the gradient of the plateau will increase).
• Do not apply a voltage higher than 600 V.
The mica window is only 0.03 mm thick and is sub-
jected to the external atmospheric pressure.
• Caution! Do not touch the mica window.
• Replace the protective cap after each use.
The glass seal of the counter tube is not resistant to
impacts and pressure.
• Do not subject the tube to knocks.
• Handle the counter tube especially carefully
when it is taken out of its supporting clip.
2. Description
The Geiger-Müller counter tube is a halogen self-
quenching trigger counter tube for the detection of
α-, β-, γ- and X-radiation.
The counter tube consists of a chromium steel cylin-
der that is filled with an argon-neon mixture together
with a halogen gas as a quenching agent. It is closed
at one end by a very thin mica window and at the
other end by a glass seal, both of which are gas-tight.
A thin wire (the counter wire) is arranged axially in
the cylinder, which it enters through the insulating
glass seal. The counter tube is contained within a
metal housing that is fitted with a shielded connect-
ing lead and a BNC socket. A handling rod is attached
to the housing by a detachable clamp. The mica
window is protected by a removable plastic cap.