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研究对裂变核材料及有关核装置进行无损探测与识别的物理可行性。其要点是由测量得到的γ特征能谱出发 ,通过对γ射线输运过程的物理分析并引入相应的参量描述 ,以推论有关核材料的特征信息。数值计算模拟实验的结果表明 ,据此方法可以在有效的精度范围内由所测量到的裂变核材料的出射γ特征谱推算出其同位素成份等重要信息。研究结果还表明 ,考虑源区核材料的自吸收修正 (称几何自屏蔽修正 )是提高计算分析精度的关键因素之一。通过对大量计算结果的分析与综合 ,还给出了某些简单几何形状的自吸收修正的简要公式。该研究对有关核材料的监控、核查及衡算等安全保障技术方面有重要的应用价值。
To study the physical feasibility of non-destructive detection and identification of fissile nuclear material and related nuclear devices. The main point is that based on the γ spectrum measured, the physical analysis of the γ-ray transport process and the introduction of the corresponding parameter description are used to deduce the characteristic information about the nuclear material. Numerical simulation results show that this method can calculate the isotope composition and other important information from the measured γ emission spectra of the fissile nuclear material within the valid range of accuracy. The results also show that considering the self-absorption correction of source material (called geometric self-mask correction) is one of the key factors to improve the accuracy of calculation and analysis. Through the analysis and synthesis of a large number of calculation results, some simple formulas for self-absorption correction of simple geometric shapes are also given. The study has important application value in security assurance technologies related to monitoring, verification and accounting of nuclear materials.