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Geiger-Müller – Design Features

typical design  is the end-window type

anode wire is supported at one end only and is located along the axis of a cylindrical cathode made of metal or glass with a metallized inner coating

radiation enters the tube through the entrance window, which may be made of mica or other material that can maintain its strength in thin sections

most Geiger tubes are operated below atmospheric pressure – window may have to support a substantial differential pressure

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