高通量快堆辐照生产^(252)Cf关键因素分析  

Analysis on key factors of ^(252)Cf production by irradiation of high flux fast neutron research reactor

作　　者：张震宇 杨红义[1] 吴明宇[1] 杨勇[1] 陆佩漪槟 ZHANG Zhenyu;YANG Hongyi;WU Mingyu;YANG Yong;LU Peiyibin(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《核技术》2024年第7期108-116,共9页Nuclear Techniques

摘　　要：^(252)Cf放射源是一种高强度同位素中子源,在科学研究、装置研发等领域具有重大需求,但长期以来依赖于进口。基于高通量快堆初步设计方案开展辐照靶件设计,结合模拟计算结果得出影响^(252)Cf核素生产的关键因素。在5×10^(15)n·cm^(-2)·s^(-1)中子通量水平下,对三种采用不同氢化锆和Eu_(2)O_(3)吸收体辐照靶件设计方案进行裂变沉积能、能谱计算,并通过燃耗计算程序开展重锔、轻锔靶件燃耗计算,与美国辐照生产^(252)Cf实验值对比。结果表明:方案3的计算值与基准值吻合较好且最适用于重锔靶辐照生产^(252)Cf,方案2适用于通过短的辐照周期辐照生产重锔核素。本文的计算与分析可为高通量快堆辐照生产^(252)Cf提供理论与技术支撑。[Background]^(252)Cf is a high-intensity isotope neutron source in great demand for scientific research and device development.Currently,it is produced only in high-flux reactors in the United States and Russia,which rely on imports in China for a long time.[Purpose]This study aims to analyze key factors of ^(252)Cf production by irradiation based on the preliminary design scheme of a high-flux fast reactor.[Methods]Firstly,an irradiation target design was implemented,and the fission deposition energies and energy spectra were calculated for three irradiated target designs using different zirconium hydride and Eu_(2)O_(3) absorbers.Then,burnup calculations for heavy and light curium targets were performed using a burnup calculation program STEP,which was developed by China Institute of Atomic Energy.The experimental values for ^(252)Cf produced by irradiation in the United States were then compared.Finally,the calculation results were analyzed using the energy spectrum and cross-section.[Results]Comparison results between simulation and experiment indicate that 245Cm is the key nuclide affecting the production of ^(252)Cf.Utilizing the hard-energy spectral characteristics of high-flux fast reactors can effectively reduce the fission loss of the target and increase the production of ^(252)Cf.[Conclusions]The calculations and analysis in this study can provide theoretical and technical support for the high-flux fast neutron research reactor irradiation production of ^(252)Cf.

关 键 词：^(252)Cf 高通量快堆 辐照靶件 能谱 燃耗计算 

分 类 号：TL99[核科学技术—核技术及应用]