Editing Geiger counter (section)

===Neutron detection===
[[File:boroncounter.svg|lang=en|thumb|Geiger tube filled with BF<sub>3</sub> for detection of thermal neutrons]]
A variation of the Geiger tube can be used to exclusively measure radiation dosage from [[neutron]]s rather than from [[Gamma ray|gammas]] by the process of [[neutron capture]]. The tube, which can contain the fill gas [[boron trifluoride]] or [[helium-3]], is surrounded by a plastic moderator that reduces neutron energies prior to capture. When a capture occurs in the fill gas, the energy released is registered in the detector.
[[File:A complete Geiger counter, with the Geiger-Muller tube 70 019.jpg|thumb|A modern one-piece Geiger–Müller counter, including Geiger–Müller tube type 70 019 (at the top)]]