| Coolidge tube | An X-ray tube, in which the cathode consists of a tungsten wire spiral surrounded by a focusing cup; the tungsten spiral is heated by an electric current; the quantity and quality of the X-rays so generated are regulated by varying the temperature of the cathode and the voltage between cathode and anode. (05 Mar 2000) |
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| Coolidge, William | <person> U.S. Physicist, 1873-1974. See: Coolidge tube. (05 Mar 2000) |