The fixed anode X ray tube is the simplest of X ray tubes commonly used. Its structure consists of three parts: anode, cathode and fixed poles, and glass shell with high vacuum in glass tube.
The anode consists of the anode head, the anode cap, the glass ring and the anode handle. The main function of the anode is to produce X rays from the surface of the anode head (usually tungsten target) to block the high-speed moving electrons, and transmit the resultant heat radiation or through the anode handle. At the same time, it absorbs two electrons and scattered rays. The production of X rays in the X - ray tube of tungsten alloy is only using the energy of less than 1% of the high speed moving electron flow, so heat dissipation is a very important problem for the X - ray tube. The cathode consists of a filament, a mask (or known as the cathode head), cathode sleeve and glass core etc.. The electron beam that strikes the anode target is emitted by the hot cathode filament (usually tungsten wire). It is formed by focusing the tungsten alloy X ray tube under the high voltage acceleration. When the electron beam impingement on the anode target is suddenly blocked, a X X ray with a continuous distribution of energy is generated, which reflects the characteristic of the anode target metal.
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