A German physicist in 1895 in the study of cathode ray tube gas discharge phenomenon has two metal electrodes embedded in a sealed glass tube, on both ends of the electrode of tens of thousands of volts of high voltage, with the pump from the air inside the glass tube. In order to cover the high pressure discharge light leaked out, and on the outside of the glass tube on a layer of black cardboard. He conducted the experiment in a dark room, accidentally discovered two meters away from glass tube, a block with a platinum barium cyanide solution soak washing board issued a bright fluorescence. Further test, with the board, board, clothing and the thickness of about two thousand - page book, hide the fluorescence. What is more surprising is when to get fluoresce board by hand; see the image of the skeletal hand on the cardboard. Roentgen decided at the time: this is not a person to see, but rays can penetrate the object. Unable to explain the principle of it, the nature of the unknown it, it stands for an unknown number of borrowed from the mathematics in the "X" as a symbol, known as the "X" ray. This is the discovery of X-ray and the origin of the name.
Except for x-ray security machine, there is also another kind, medical x-ray bag scan equipment, according to different purposes.
Industrial X-ray machine can be generated according to the intensity of the beam of hard X-ray machine and soft X-ray equipment.
Medical X-ray machine according to the purpose can be divided into diagnostic X-ray machine and treatment of two kinds of X-ray facilities.
Use the high voltage transformer in the high pressure on the two metal electrodes. Industrial X-ray facility is used for aerospace, construction of oil, natural gas pipeline, boiler, pressure vessel and indispensable to the nondestructive flaw detection equipment. Industrial x-ray security machines point to weeks to 360 degree projection rays. Orientation is 60 degrees emission rays. Again the other is voltage levels. From 10 kiva to 450 kiva, kiva voltage is higher, the radiation intensity. Hard X-ray security detector produced high voltage, such as 100 kiva and 100 kiva voltages to the X-ray tube; the rays can penetrate 5-50 mm steel plate. And by electron accelerator can produce rays penetrate more than 100 mm steel plate.
X-ray facility consists of glass shell, the cathode, and anode, which as well as the cathode encapsulated in high vacuum glass shell. Cathode at high temperature can launch a sufficient number of electronic. When high-speed electronic impact tungsten target, electron kinetic energy converted into two parts. It mainly reflects in the anode structure difference, the former is mainly made up of tungsten target surface and heat transfer of copper, which is mainly composed of target surface, rotor, stator, rotor and bearing.