In an ionization chamber, the current flow is directly dependent on pressure. Pressure is related to the density of the gas in the ionization chamber. This principle is used in the design of radioactive vacuum meters. An ionization chamber is kept inside an air-tight casing which is in communication with the evacuated cavity where the pressure is being measured. The irradiation of the gas by alpha particles is carried out by the usage of a good radioactive source. The radioactive source is always placed at the bottom of the ionization chamber. A collector which is a system of thin wires or filaments is set up in the chamber. The ionization chamber is fed from a d.c source through the insulating layers. The collector has a negative potential. An amplifier is also used here.
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