Tungsten Alloy Advantages in GM Detector

In a Geiger-Mueller radiation detector(GM detector) including a relatively large surface stainless steel cathode, a coating of chromium oxide on the interior surface of said cathode. It has been found that a thin layer of tungsten alloy can be used on the inside surface of a cylindrical cathode to give a GM detector having high sensitivity and outstanding resistance to the halogen gas.

Furthermore, the tungsten alloy layer can be applied to the interior of a cylindrical cathode as a thin foil thus omitting the necessity of electro depositing the tungsten alloy layer on the interior surface.

Considerable significance is the fact that a stainless steel GM tube in which the interior surface of the cathode is coated with a thin layer of chromium oxide and a tungsten alloy foil liner possesses remarkable high temperature stability even though it is not subjected to the thermal cycling or bromine passivation techniques.

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