电子感应加速器是利用涡旋电场使电子加速到很高能量打到金属靶上产生γ射线或直接引出高能电子的一种加速器。十多年前,国外开始以电子感应加速器产生的γ射线用于无损探伤。因为这种加速器一般可以得到的能量比常用的辐射探伤仪器如 X 光机及同位素要高,所产生的γ射线较强,可以穿透较厚的金属使胶片迅速感光,它的焦点小,照相的灵敏度很高。而且这种加速器结构比较简单、造价便宜、操作方便,因此在进行大而厚的金属工件的无损探伤中,电子感应加速器很快受到了重视。根据能量与减弱系数的关系曲线,这种γ射线对于钢铁来说,约在6～8兆电子伏时减弱系数为最小, Electron-induced accelerator is the use of eddy electric field to accelerate electrons to a very high energy hit the metal target to produce γ-ray or direct high-energy electrons in an accelerator. More than a decade ago, foreign countries began to use γ-rays generated by the electron-induced accelerators for non-destructive testing. Because this accelerator can generally get energy higher than the commonly used radiation detection equipment such as X-ray machines and isotopes, the resulting γ-ray is stronger, can penetrate the thicker metal film so sensitive, its focus is small, the camera The sensitivity is high. And this accelerator structure is relatively simple, cheap, easy to operate, so in the large and thick non-destructive testing of metal parts, the electronic sensing accelerator quickly received the attention. According to the energy and the attenuation coefficient of the curve, the γ-ray for steel, about 6 ~ 8 trillion electron volts when the attenuation coefficient is the smallest,