基于表层析镍纤维玻璃管阵列的冷中子聚焦光学关键技术研究

Neutron depth profiling and neutron activation analysis are widely used in physics, chemistry, materials, archaeology and other fields. At present, the neutron flux of reactor or spallation neutron source cannot meet the actual needs of the fast, high-accuracy and low-detection-limit measurements. It is of great significances to research and develop neutron focusing technology. Nickel alloy film was formed on the inner wall of Ni-Si-B-Al-K glass tube array by hydrogen reduction method to improve the neutron transmission efficiency of the glass capillary array focusing lens. The specific research contents include: (1) Research of the effect of nickel oxide content on the static mechanical properties of Ni-Si-B-Al-K glass system, and to optimize the glass compositions; (2) Explore the optimum conditions of hydrogen reduction reaction, and obtain the thickness and surface roughness of nickel alloy film; (3) Develop a simulation model to analyze the neutron transmission in the nickel-precipitated glass tube array according to the ray tracing theory and lay a foundation for the application the nickel-precipitated glass capillary array focusing lens.

中子深度分析、中子活化分析等无损检测技术广泛用于物理、化学、材料、考古等领域。当前反应堆与散裂中子源的中子通量密度往往不能满足快速、高精度、低探测下限的实际需求，开展高性能中子聚焦技术以提高中子通量密度尤为重要。本项目基于毛细管光学原理，利用高温氢还原法在镍-硅-硼-铝-钾玻璃纤维管阵列的内壁形成镍合金膜，提高纤维玻璃管阵列的中子传输效率，进而提高其中子聚焦能力。具体研究内容包括：（1）研究氧化镍的掺入量对于镍-硅-硼-铝-钾玻璃系统静态力学的影响，得出最优玻璃系统组分。（2）探索镍-硅-硼-铝-钾玻璃系统的最佳氢还原条件及形成镍合金膜厚度及表面粗糙度等信息。（3）根据光线追迹原理，建立冷中子在表层析镍玻璃管阵列中传输的计算模型，为表层析镍纤维玻璃管中子聚焦技术的应用奠定理论基础。