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快中子照相系统由闪烁光纤阵列和科学级可见光CCD等元件组成.14MeVD-T聚变中子在穿透样品后进入50mm×50mm闪烁光纤阵列,中子辐射转换为中心波长496nm的绿光.光纤阵列长100mm,光纤截面500μm×500μm,100×100根闪烁体光纤组成阵列.阵列对14MeV中子探测效率经估算可达21·4%.CCD与光纤阵列之间采用反射镜和透镜耦合方式,使CCD避开中子源直接辐照.综合考虑光纤尺寸、CCD记录噪声及中子源与受照样品几何关系等因素,理论上系统可获得整体分辨率1·5mm的中子图像.在K400直流加速器中子源上进行了初步实验,获得了中子图像.
The fast neutron imaging system consists of a scintillation fiber array and a scientific-grade visible light CCD, etc. The 14MeVD-T fusion neutron enters a 50 mm × 50 mm scintillation array after it has penetrated the sample, and the neutron radiation is converted into a green centered at 496 nm. Array length 100mm, fiber cross section 500μm × 500μm, 100 × 100 scintillator fiber arrays array 14MeV neutron detection efficiency up to 21.4% .CCD and the optical fiber array using a mirror and lens coupling, So that the CCD to avoid direct exposure to the neutron source.Considering the optical fiber size, CCD recording noise and neutron source and the irradiated sample geometry and other factors, the theoretical system can obtain the overall resolution of 1 · 5mm neutron images.K400 DC accelerator neutron source on a preliminary experiment, obtained neutron images.