The Geiger – Muller tube can be used to detect
ionising radiation and count the number of ionising particles. When
gas enters the chamber of either instrument through a window at one
end it ionises the molecules of a gas at low pressure. A voltage
applied across the tube causes the ions to accelerate towards the
anode/cathode and an electrical pulse passes through the circuit. If
a steady current is produced this indicates the intensity of
radiation.
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