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Regarding the construction of a rotating anode X-ray tube: a. The entire anode disc is usually made of tungsten b. The anode stem is made of molybdenum to improve the conduction of heat away from the anode disc c. The rotor bearings are lubricated with a soft metal d. The electric brushes of the X-ray tube motor are made of graphite e. The filament assembly is aligned with the anode stem |
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Answer» a. False. It is usually made of molybdenum, in which the target annulus (made of tungsten alloy) is embedded. b. False. The opposite is true. Molybdenum has a low heat conductivity, which slows the conduction of heat towards the rotor bearings, protecting them from heat damage. c. True. They are usually lubricated with silver powder. d. False. Induction motors are used. These are brush less. e. False. The filament is offset towards the edge of the anode, in line with the target annulus. |
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