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background of the X-ray molybdenum alloy

X-ray tubes used for diagnostic imaging typically consist of four main components: the anode, the cathode, the frame structure and the housing. The main function of the anode is to provide a track material for the electron beam, which is generally a tungsten-rhenium alloy. In general, the process of X-radiation production is only 1% efficient at generating characteristic X-ray radiation, the rest is converted to heat. Heat management is paramount; particularly since higher power levels are desired due to the increase in X-ray efficiency with power, and faster imaging. Due to the large energy adsorption, it is necessary to rotate the anode to constantly bring cooler material under the electron beam. Therefore, important design characteristics are the total amount of energy that can be stored in the substrate, and the ability of the anode assembly to dissipate energy. The current molybdenum construction allows energy to transfer from the focal track throughout the bulk of the target. The rim temperature of some tube units can reach 1495° C. The tungsten-rhenium focal track can approach near melting temperature (circa 3000° C.). Any volatile species, such as oxides or metals, at this temperature would be detrimental to the life of the unit. 

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