中子辐照后镍靶件中63Ni分离提纯技术研究

63Ni是通过在反应堆中子辐照62Ni而产生的，产生的63Ni再经过分离提纯，制成高纯63NiCl₂溶液。以在高通量工程试验堆内辐照逾30 a的镍靶件为实验对象，采用ZGANR170核级阴离子树脂对辐照后镍靶件溶解液中的63Ni进行提纯，最终得到高纯度的63NiCl₂溶液产品。详细介绍了分离提纯原理、热实验分离步骤和最佳分离条件。酸度对分离的影响实验研究表明，当HCl浓度大于等于9 mol/L时才能获得了良好的分离效果。镍纯化过程对γ核素的去污系数为2.33×103，63NiCl₂产品核纯度大于99.9%。辐照后镍靶件经溶解、体系转换、分离提纯全流程63Ni的回收率为86.5%。 

Study on Separation and Purification Technology of 63Ni from Neutron Irradiated Nickel Target

63Ni is produced by the neutron irradiation of 62Ni in a reactor. After separation and purification, the highly purified 63NiCl₂ solution was obtained. In this paper, using the nickel target which was irradiated in High Flux Engineering Test Reactor (HFETR) for more than 30 years as the research subject, the ZGANR170 nuclear anion resin was used to purify 63Ni from the solution of irradiated nickel target. In the end, the high purity 63NiCl₂ solution products were obtained. In addition, the separation principle, procedures and the optimal separation condition were both introduced in detail. Moreover, the effect of acidity on separation was studied experimentally. The result demonstrated that only when the concentration of HCl is greater than or equal to 9 mol/L, a good separation effect could be obtained. Besides, the decontamination factor of γ radionuclides in the whole process of nickel purification is 2.33×103. And the nuclear purity of the 63NiCl2 solution is more than 99.9%. After dissolution, system conversion and separation, the recovery rate in the whole process is 86.5%.