| http://www.w3.org/ns/prov#value | - The fixed target X-ray tube 14 a shown in FIG. 2 comprises a glass envelope 19 containing a cathode 21 formed from a filament shrouded by a cover 20 and a target 22 made from a heavy metal, such as tungsten or molybdenum, and tilted about 2??? to 20??? with respect to the cathode 21.
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