Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Wikipedia.
Related to Geiger-Müller counter: Geiger tube
Geiger-Müller counter[¦gī·gər ′myül·ər ‚kau̇nt·ər]
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.