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给出了一种基于~(103)Rh(n,n′)~(103)Rh~m反应监测快中子注量的方法。根据干扰核素半衰期不同的特点,选取合适的冷却和测量时间,降低了~(103)Rh(n,n′)~(103)Rh~m活化率测量中干扰核素的影响。根据152Eu标定实验结果,利用遗传算法优化探测器尺寸,建立探测器蒙特卡罗算法模型。利用模型校正~(99)Mo-~(99)Tcm放射源实验效率,解决了探测器效率标定和射线自吸收问题。开展了快中子注量监测,实验结果与铁、硫、镍等快中子监测箔一致性较好,测量不确定度约为13.1%。
A method of fast neutron flux monitoring based on ~ (103) Rh (n, n ’) ~ (103) Rh ~ m reaction is given. According to the different characteristics of the half-life of the interfering nuclides, the appropriate cooling and measuring time are selected to reduce the influence of the interfering nuclides in the measurement of the activation rate of ~ (103) Rh (n, n ’) ~ (103) Rh ~ m. According to the result of 152Eu calibration experiment, the size of detector is optimized by genetic algorithm, and the detector Monte Carlo algorithm model is established. Using the model to correct the experimental efficiency of ~ (99) Mo- ~ (99) Tcm radioactive sources, the problem of detector efficiency calibration and radiation self-absorption was solved. The fast neutron flux monitoring was carried out. The experimental results are in good agreement with the fast neutron monitoring foils such as iron, sulfur and nickel. The measurement uncertainty is about 13.1%.