The diameter and length of the component marked with arrow is:
Correct Answer: 2 mm and <1 cm
Description: Cathode:
The cathode in an x-ray tube consists of a filament and a focusing cup. The filament is the source of electrons within the x-ray tube. It is a coil of tungsten wire approximately 2 mm in diameter and 1 cm or less in length. Filaments typically contain approximately 1% thorium, which greatly increases the release of electrons from the heated wire. The filament is heated to incandescence with a low-voltage source and emits electrons at a rate proportional to the temperature of the filament.
Category:
Radiology
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