| 释义 |
x-ray tube
noun
Usage: usually capitalized X
: a high-vacuum tube in which a concentrated stream of electrons from a thermionic cathode strikes a metal target and produces X rays from the side of the tube at right angles in a quantity and intensity that is controlled by the cathode temperature, with a wavelength and hardness that depends upon the voltage applied to the tube terminals, and with a spectral character determined by the material of the target |