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The Principle Of X-ray Tube

Aug 28, 2017

The X-ray tube comprises an anode and a cathode two electrodes, respectively, for a target material for electron bombardment and a filament for transmitting electrons. The two level is sealed in a high vacuum glass or ceramic enclosure. The power supply portion of the X-ray tube contains at least one low-voltage power source that heats the filament and a high-voltage generator that imposes high voltages on the poles. When the tungsten wire generates an electronic cloud through enough current, and has enough voltage (kv grade) to be added between the anode and the cathode, the electron cloud is pulled toward the anode. At this time, the electron to high-energy high-speed state hit the tungsten target, high-speed electrons reach the target surface, the movement is suddenly blocked, a small part of its kinetic energy into radiant energy, in the form of X-rays, the radiation generated in this form is called Bremsstrahlung. Changing the size of the filament current can change the temperature of the filament and the amount of electrons emitted, thus altering the tube current and the magnitude of the X-ray strength. Changing the excitation potential of an X-ray tube or selecting a different target can change the energy of an incident X-ray or the strength at different energies. Because of the high energy electron bombardment, the X-ray tube is very hot and requires a forced cooling of the anode target material.