CAJ | 학술논문

针对高精度射线在线检测技术中存在的合金补偿问题，提出了窄束单能入射射线下合金补偿的理论计算公式，找出了合金补偿系数和厚度之间的规律。通过实验方法测量了实际系统中的合金补偿系数，验证了理论分析的正确性。利用蒙特卡罗程序MCNP5建立几何模型进行仿真实验，结果和理论分析相一致，与实验结果亦相似，说明几何模型能准确反映实际情况，可替代实验。对实验和仿真结果按照理论参考值进行合金补偿，补偿效果明显，1.25 M eV射线能量下304不锈钢相对测量误差从约1％减小至约0.1％。
침대고정도사선재선검측기술중존재적합금보상문제，제출료착속단능입사사선하합금보상적이론계산공식，조출료합금보상계수화후도지간적규률。통과실험방법측량료실제계통중적합금보상계수，험증료이론분석적정학성。이용몽특잡라정서MCNP5건립궤하모형진행방진실험，결과화이론분석상일치，여실험결과역상사，설명궤하모형능준학반영실제정황，가체대실험。대실험화방진결과안조이론삼고치진행합금보상，보상효과명현，1.25 M eV사선능량하304불수강상대측량오차종약1％감소지약0.1％。
To solve the problem of alloy compensation for high accuracy radiographic inspection technique ,a calculation formula of alloy compensation coefficient was presen‐ted and the relation between alloy compensation coefficient and thickness was found . The alloy compensation coefficient measured by an isotope thickness measurement instrument indicates that the theoretical analysis results are correct .A geometric model was built by MCNP5 based on the Monte Carlo method .The simulation results are consistent with the theoretical analysis results .It proves that the model is accurate and the method to calculate the alloy compensation coefficient is feasible .To compensate the experimental and simulated thickness with the calculated alloy compensation coefficient , the relative measurement error of 304 stainless steel decreases from about 1% to 0.1%at 1.25 M eV .