Research on Material Equivalent Value and its Application in X-radiographic Testing Technology

Author of the article:WANG Ronghua1,2, LIU Wenbo1

Author's Workplace：1. Nanjing University of Aeronautics and Astronautics, Nanjing 210000, China; 2. State-owned Wuhu Machinery Factory, Wuhu 241000, China

Key Words：radiographic testing; technology; material; equivalent coefficient

Abstract：The relationship between the material equivalent coefficient and the material attenuation coefficient was obtained through the theoretical derivation of the equivalent thickness of different materials. The equivalent coefficients of steel and titanium alloy were measured under different tube voltages. The results show that the material equivalent coefficient corresponds well with the theoretical and measured values of the attenuation coefficient at 70 kV and 90 kV. However, due to factors such as scattered rays, there is a certain deviation between the experimental and theoretical values of the material equivalent coefficient and attenuation coefficient above 100 kV. In X-ray detection, it is propitious to apply the equivalent value in a certain range of tube voltages to the actual detection process.