X射线检测工艺中的材料等效值及应用研究

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

针对飞机修理射线检测工艺中的不同材料等效系数开展研究,通过对不同材料等效厚度的理论推导得到了材料等效系数与衰减系数的关系,并使用钢与钛合金在不同管电压下进行了等效系数测量实验。结果表明,管电压在70 kV和90 kV时材料等效系数与衰减系数理论值和实测值能很好的对应,但因为散射线等因素,在100 kV以上时材料等效系数与衰减系数实验值与理论值之间有一定偏差。在射线检测中,在一定管电压范围内合理采用等效值应用到实际检测过程中,将有利于射线检测的实施。

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 eqxiivalent 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.