Describe using a labelled diagram, the mode of operation of an X-ray tube 

Describe using a labelled diagram, the mode of operation of an X-ray tube

Mode of operation

• The filament is heated by a low voltage supply and the electrons are emitted by thermionic emission.
• The concave focusing cathode focuses the electrons from the filament onto the target.
• These electrons are accelerated towards the anode by the high voltage between the filament and the Anode.
• When the electrons (cathode rays) strike the metal target, about only 1% their kinetic energy is converted to X-rays and the 99% of their kinetic energy is converted to heat, which is conducted away by the cooling fins.

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