X线的发生程序是首先接通电源，经过降压变压器，供X线管灯丝加热，产生自由电子并云集在阴极附近。当升压变压器向X线管两极提供高压电时，阴极与阳极间的电势差陡增，处于活跃状态的自由电子，受强有力的吸引，使成束的电子，以高速由阴极向阳极行进，撞击阳极钨靶原子结构。此时发生了能量转换，其中约1%以下的能量形成了X线，其余99%以上则转换为热能。前者主要由X线管窗口发射，后者由散热设施散发。
The procedure of X-ray is to turn on the power supply first, pass through the step-down transformer, heat the filament of X-ray tube, generate free electrons and gather near the cathode. When the boost transformer provides high voltage electricity to the two poles of the X-ray tube, the potential beijing.89ix.com zhixiang.07858.netdianxiangan.37ix.cn zhoucheng.37ix.cn chongdianzhuang.07858.net langyashan.37ix.com.cndifference between the cathode and the anode increases sharply, and the free electrons in active state are strongly attracted, so that the bundles of electrons move from the cathode to the anode at high speed and impact the tungsten target atomic structure of the anode. At this time, energy conversion occurs, of which less than 1% of the energy forms X-ray, and the remaining more than 99% is converted to heat energy. The former is mainly emitted by X-ray tube windows, while the latter is emitted by heat dissipation facilities.