Tungsten Alloy Gas Filled Detector

Tungsten alloy gas filled detector’s instrument works on the principle that as radiation passes through air or a specific gas, ionization of the molecules in the air occur. When a high voltage is placed between two areas of the gas filled space, the positive ions will be attracted to the negative side of tungsten alloy gas filled detector (the cathode which is made of tungsten alloy tube) and the free electrons will travel to the positive side (the anode). These charges are collected by the anode and cathode which then form a very small current in the wires going to tungsten alloy gas filled detector. By placing a very sensitive current measuring device between the wires from the cathode and anode, the small current is measured and displayed as a signal. The more radiation which enters the chamber, the more current is displayed by the instrument.

Many types of tungsten alloy gas-filled detectors exist, but the two most common are the ionization chamber used for measuring large amounts of radiation and the Geiger-Muller or GM detector used to measure very small amounts of radiation.

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