Geiger-Müller counter [¦gī·gǝr `myül·ǝr ´kau̇nt·ǝr] NUCLEONICS 1. A radiation counter that uses a Geiger-Müller tube in appropriate circuits to detect and count ionizing particles; each particle crossing the tube produces ionization of gas in the tube which is roughly independent of the particle's nature and energy, resulting in a uniform discharge across the tube. Abbreviated GM counter. Also known as Geiger counter. 2. See <<Geiger-Müller tube>> |