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加速器中子源比反应堆中子源更具灵活性,北京大学正在发展基于RFQ加速器的小型中子照相装置。为了更好地设计和优化此装置,实现高品质的中子照相,我们在北京大学4.5 MV静电加速器上建立了中子照相实验平台,包括科学级制冷、高灵敏度、低噪声的CCD数字成像系统,模拟基于厚铍靶9Be(d,n)反应RFQ中子源的条件,并利用此系统开展中子成像技术的研究。实验在像平面热中子注量率为5×103 cm-2·s-1或快中子注量率为3.7×104 cm-2·s-1的情况下获得了一定质量的热中子及快中子照片。当利用RFQ直线加速器强中子源时将可获得更高质量的图片,从而可以满足大多数的应用需要。
Accelerator neutron sources are more flexible than reactor neutron sources. Peking University is developing small neutron radiographic units based on RFQ accelerators. In order to better design and optimize this device and achieve high quality neutron photography, we set up a neutron photography experiment platform at Peking University 4.5 MV electrostatic accelerator, including scientific-grade refrigeration, high sensitivity, low noise CCD digital imaging system , The conditions of RFQ neutron source based on 9Be (d, n) reaction of thick beryllium target were simulated, and the neutron imaging technology was studied by this system. Experiments in the case of a planar thermal neutron fluence rate of 5 × 103 cm-2 · s-1 or a fast neutron fluence rate of 3.7 × 104 cm-2 · s-1 obtained a certain amount of thermal neutron And fast neutron photos. When using a strong RFQ linear accelerator neutron source will be able to get higher quality pictures, so as to meet the needs of most applications.