Tungsten Target in X-Ray Tube Application

Tungsten target is also known as tungsten sputtering target. It owns high melting point, elasticity, low coefficient of thermal expansion, resistivity and fine heat stability and other properties. And it has been widely applied in electrical industries, chemical equipment (X-Ray tube, thin-film material, semi-conductor integrated circuit), medical equipment, smelting equipment, rare earth smelting, aerospace and many other fields.
Tungsten target implies an X-Ray tube where high energy electrons are directed in a vacuum to strike a tungsten target. Where the electrons strike the tungsten very short wavelength X-rays are generated and pass out through the vacuum tube for use in medical diagnosis and engineering radiography of welds and castings etc. Tungsten has a very high melting point but it is nevertheless melted where the beam strikes for this reason the target is rotated to give a fresh target surface very frequently and the tungsten target is a fairly thin plate welded or brazed onto a water-cooled copper backing. Less than 1% of the electrical energy delivered into the X-ray tube comes out as X-rays; the other 99% is waste heat. Tungsten is chosen for the short wavelength and penetrating power of it's characteristic 

 

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