EXPERIMENTS ON NEUTRONS TRANSMISSION THROUGH LITHIUM HYDRIDE LAYERS-7 IN URANIUM MULTIPLYING SYSTEM WITH NEUTRON ACTIVATION ANALYSIS

A. Vaivod, A. Yudov, S. Besov, S. Andreev
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Abstract

The paper provides the precision experimental results on fission spectrum neutrons transmission through lithium hydride layers-7 with neutron activation analysis. The experiments were performed in Zababakhin All-Russia Research Institute of Technical Physics” on a critical assembly stand FKBN 2. A cylindrical multiplying system (MS) made of high enriched uranium was used as a source of fission spectrum neutrons. Activation integrals of neutron activation detectors (NADs) located at different points of the composite lithium-7 hydride reflector face-mounted on the cylindrical uranium MS were determined in the experiments. NADs based on nickel, indium, titanium, aluminum and copper were used. NADs of different types were exposed to radiation at power ~25-30 W during 1-1,5 hours. Nickel NAD was used as a monitor. Activation integrals absolute measurement error was determined by a certified technique and ranged from ~4 to ~8 % (2σ). Relative measurement error was determined by statistical accuracy, instrument peaks software processing correctness and was found not to exceed 5,4 % (2σ). Using the data obtained, spectral indices (the ratio of the normalized values of the activation integrals of various detectors types to the one of nickel detector), which provide information on the neutron spectrum were determined.
中子通过铀倍增体系氢化锂-7层的实验及中子活化分析
利用中子活化分析,给出了氢化锂7层裂变谱中子透射的精确实验结果。实验在扎巴巴赫金全俄技术物理研究所的FKBN 2关键装配台上进行。采用高浓缩铀圆柱倍增系统作为裂变谱中子的来源。实验中测定了装在圆柱形铀质谱上的锂-7氢化物复合反射器不同位置的中子活化探测器(NADs)的活化积分。采用了镍、铟、钛、铝和铜基NADs。将不同类型的NADs分别置于25 ~ 30 W功率下照射1 ~ 1,5 h。采用NAD镍作为监护仪。激活积分的绝对测量误差范围为~ 4% ~ ~ 8% (2σ)。相对测量误差由统计精度、仪器峰软件处理正确性确定,不超过5.4% (2σ)。利用得到的数据,确定了提供中子谱信息的光谱指数(各种探测器激活积分归一化值与镍探测器激活积分归一化值之比)。
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