- Geiger⇄Geiger orGeiger-Muller counter
(Physics.) a device which detects and counts ionizing particles. It consists essentially of a tube with two electrodes between which a high potential difference is maintained. When a charged particle enters the tube, i - Geiger⇄Geiger orGeiger-Muller tube
1. the tube in a Geiger counter.
Ex. Cosmic rays and Geiger tubes have been combined in a new altimeter to tell pilots what their altitudes are (Science News Letter).
2. Geiger counter.