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Geiger-Müller counter |
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Geiger-Müller (GM) counter [gī′gər mil′ər] Etymology: Hans Geiger, German physicist, 1882-1945; Walther Müller, twentieth century German physicist; Fr, conter, to tell an electronic device that indicates the level of radioactivity of a substance by counting the number of ionizing subatomic particles emitted by the substance. As the particles pass through a gas-filled tube inside the counter, they ionize the gas and cause an electric discharge. The tube cannot identify the type or energy of a particle. Also called Geiger counter. Geiger counter, Geiger-Müller counter an amplifying device that indicates the presence of ionizing particles emitted by a substance; used as a means of determining the presence of radioactivity. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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