Industrial CT (industrial computerized tomography) refers to nuclear imaging technology applied in industry. Its basic principle is based on the attenuation and absorption characteristics of radiation in the detected object. The ability of the same substance to absorb radiation is related to the nature of the substance. Therefore, the use of radionuclides or other sources of radiation emitted, with a certain energy and intensity of X-rays or γ-rays, in the detected object attenuation pattern and distribution, it is possible to display by the detector to obtain detailed information on the inside of the object, and finally with computer information processing and image reconstruction technology, in the form of an image to show.