Researchand Development Volume Detection System for Graphite and Carbon ComponentsBased on Electron Linear Accelerator

The Institute of Nuclear and New Energy Technology (INET) has developed a spiral CT detection system for small graphite and carbon components. The system uses 60Co as a radiation source, which provides good stability and can detect large quantities of graphite and carbon components over an extended period. However, it cannot meet the detection requirements of large-sized components. This paper is based on the X-ray spectrum and attenuation coefficient of graphite and carbon components, as well as the optimization of the layout parameters of the system, to design a detection system based on a 9 MeV electron linear accelerator. This system can preliminarily meet the volume detection needs of large-sized graphite and carbon components in the reactor core, in the range of 700 mm-1000 mm. The results show that the accelerator detection system can effectively penetrate large graphite components, and theoretically can achieve a defect detection requirement of 1mm according to the design of the detector. The accelerator system and the isotope source system can complement each other well.