| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024Gei•ger count•er /ˈgaɪgɚ ˌkaʊntɚ/USA pronunciation n. [countable]- Physicsan instrument for detecting certain radiation, used chiefly to measure radioactivity.
WordReference Random House Unabridged Dictionary of American English © 2024Gei′ger count′er, - Physicsan instrument for detecting ionizing radiations, consisting of a gas-filled tube in which electric-current pulses are produced when the gas is ionized by radiation, and of a device to register these pulses: used chiefly to measure radioactivity. Also called Gei′ger-Mül′ler count′er.
- named after H. Geiger 1920–25
Collins Concise English Dictionary © HarperCollins Publishers:: Geiger counter, Geiger-Müller counter /ˈɡaɪɡəˈmʊlə/ n - an instrument for detecting and measuring the intensity of ionizing radiation. It consists of a gas-filled tube containing a fine wire anode along the axis of a cylindrical cathode with a potential difference of several hundred volts. Any particle or photon which ionizes any number of gas molecules in the tube causes a discharge which is registered by electronic equipment. The magnitude of the discharge does not depend upon the nature or the energy of the ionizing particle
Etymology: 20th Century: named after Hans Geiger and W. Müller, 20th-century German physicist |