Editing Geiger–Müller tube (section)

===End window type===
[[File:Geiger-Muller-counter-en.png|thumb|Schematic of a Geiger counter using an "end window" tube for low-penetrating radiation. A loudspeaker is also used for indication]]
For alpha particles, low energy beta particles, and low energy X-rays, the usual form is a cylindrical '''end-window tube'''. This type has a window at one end covered in a thin material through which low-penetrating radiation can easily pass. [[Mica]] is a commonly used material due to its low mass per unit area. The other end houses the electrical connection to the anode.

====Pancake tube====
[[File:Geiger tube si8b.jpg|thumb|right|Pancake G–M tube, the circular concentric anode can clearly be seen.]] 
The '''pancake tube''' is a variant of the end window tube, but which is designed for use for beta and gamma contamination monitoring. It has roughly the same sensitivity to particles as the end window type, but has a flat annular shape so the largest window area can be utilized with a minimum of gas space. Like the cylindrical end window tube, mica is a commonly used window material due to its low mass per unit area. The anode is normally multi-wired in concentric circles so it extends fully throughout the gas space.