Ionization Chamber: Principle, Construction, and Working Guides

An ionization chamber is a device used in the detection of ionizing radiation such as X-rays, gamma rays, and beta particles. Its application areas are vast, right from medical physics to radiation safety and industrial monitoring.

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Principle of the Ionization Chamber

An ionization chamber works with the basic principle that the ionizing radiation, as it moves through the gas, produces charged particles. The resultant charged ions and electrons may be collected by an electric field into a measurable electric current due to radiation intensity.

Ionization chamber consists of:

A gas-filled enclosure is normally occupied by air or an inert gas. 

Two electrodes, one an inner collecting electrode and the other an outer electrode

High voltage power supply

A measuring circuit to detect current

Application based, it is sealed or vented.

Working of Ionization Chamber

Whenever the Varian chamber is struck by radiation, the gas molecules inside get ionized by the formation of positive ions and free electrons. These charges drift towards the electrodes due to the applied electric field and generate a rather small but steady current. This current is directly proportional to the dose or intensity of radiation.

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Applications

Ionization chambers are commonly used in radiotherapy dose measurement, environmental radiation monitoring, and laboratory calibration systems.