发表机构
Shenzhen Technology University; North Night Vision Technology (Nanjing) Research Institute Co., Ltd.（深圳理工大学; 北方夜视科技（南京）研究院有限公司）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究研制了一种基于六角形毛细管阵列填充EJ-309液体闪烁体的中子探测器，通过激光和AmBe源实验验证了光扩散抑制效果，并测得单毛细管探测效率约10.07%、位置分辨率54微米，为其高分辨率中子成像应用提供了实验依据。
AI 中文摘要
毛细管液体闪烁体探测器在高分辨率中子成像方面具有广阔前景，然而关于其光扩散机制和空间性能的实验数据仍然有限。本文报道了一种基于六角形毛细管阵列填充EJ-309液体闪烁体的中子探测器，毛细管内径约为50微米，采用9微米像素的相机读出。激光实验表明，在加入金属光吸收体后，全光斑的半高全宽从260微米减小至90微米，证实了其对横向光扩散的有效抑制。利用AmBe中子源，基于背景帧建立了5σ阈值的有效视场。对于单毛细管事件，脉冲高度谱服从朗道分布，最概然值为0.133±0.001（统计误差），本征探测效率为10.07%±1.26%（统计误差）±1.43%（系统误差），归一化到活性液体闪烁体面积后约为13.55%。点扩散函数核心的径向半高全宽为12.8微米，质心定位精度约为5.5微米（1σ），而本征位置分辨率受毛细管间距限制为54微米。对于1至2根毛细管，线性度良好；对于2至3根毛细管，由于额外捕获扩散光而出现偏差。这些结果为毛细管液体闪烁体中子探测器在成像应用方面提供了实验基础和物理理解。
英文摘要
Capillary liquid scintillator detectors are promising for high-resolution neutron imaging, yet experimental data on their light spread mechanism and spatial performance remain limited. Here, we report a neutron detector based on a hexagonal capillary array filled with EJ-309 liquid scintillator, with an inner diameter of about 50 um and a camera readout of 9 um pixels. Laser experiments show that the FWHM of the full light spot decreases from 260 um to 90 um with a metal light absorber, confirming effective suppression of lateral light spread. Using an AmBe neutron source, an effective field of view with a 5-sigma threshold was established from background frames. For single-capillary events, the pulse height spectrum follows a Landau distribution with a most probable value of 0.133 +/- 0.001 (stat.), and the intrinsic detection efficiency is 10.07% +/- 1.26% (stat.) +/- 1.43% (syst.), corresponding to about 13.55% when normalized to the active liquid scintillator area. The point spread function core yields a radial FWHM of 12.8 um and a centroid positioning precision of approximately 5.5 um (1 sigma), while the intrinsic position resolution is limited by the capillary pitch to 54 um. Linearity is good for 1 to 2 capillaries, with deviation appearing for 2 to 3 capillaries due to additional capture of spread light. These results provide experimental basis and physical understanding for imaging applications of capillary liquid scintillator neutron detectors.
