紧凑型氘氚中子Generator的中子共振透射分析
Neutron Resonance Transmission Analysis with a Compact Deuterium-Tritium Neutron Generator
摘要：
中子共振透射分析（NRTA）是一种光谱技术，它利用超热中子的共振吸收来推断物体的同位素组成。这种光谱技术在许多传统的科学和核安全领域都具有相关性。NRTA过去使用大型昂贵的加速器设施来实现精确的中子束，这大大限制了其适用性。在这项工作中，我们描述了一系列的NRTA实验中，我们使用一个紧凑的，低成本的氘氚（DT）中子发生器产生短中子束（2.6米）随着$^6$锂玻璃中子探测器。五种元素--银、镉、钨、铟和$^{238}$ U --的飞行时间光谱数据清楚地显示了1-30 eV范围内的相应吸收线。实验结果表明，NRTA在这种简化的配置的适用性，并证明了这种紧凑和低成本的方法的可行性。这将大大拓宽NRTA的适用范围，使其在材料科学、核工程和军备控制等许多领域都具有实用性和适用性。
英文摘要：
Neutron Resonance Transmission Analysis (NRTA) is a spectroscopic technique which uses the resonant absorption of neutrons in the epithermal range to infer the isotopic composition of an object. This spectroscopic technique has relevance in many traditional fields of science and nuclear security. NRTA in the past made use of large, expensive accelerator facilities to achieve precise neutron beams, significantly limiting its applicability. In this work we describe a series of NRTA experiments where we use a compact, low-cost deuterium-tritium (DT) neutron generator to produce short neutron beams (2.6~m) along with a $^6$Li-glass neutron detector. The time-of-flight spectral data from five elements -- silver, cadmium, tungsten, indium, and $^{238}$U -- clearly show the corresponding absorption lines in the 1-30 eV range. The experiments show the applicability of NRTA in this simplified configuration, and prove the feasibility of this compact and low-cost approach. This could significantly broaden the applicability of NRTA, and make it practical and applicable in many fields, such as material science, nuclear engineering, and arms control.
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