论文标题
快速塑料闪光灯的低能光产量
Low Energy Light Yield of Fast Plastic Scintillators
论文作者
论文摘要
使用双碎片运动学重建的紧凑型中子成像仪正在设计用于特殊核材料的定位和表征。这些中子成像系统依赖于具有快速迅速时间响应的闪烁体作为检测介质。由于N-P弹性散射是有机闪烁体中快速中子相互作用来产生光的主要机制，因此需要质子光屈服数据才能准确评估闪烁体性能。一系列商业快速塑料有机闪光灯的质子光产率--- EJ-200，EJ-204和EJ-208 ---通过劳伦斯·伯克利国家实验室的88英寸回旋体的双飞行器技术测量。使用可调节的杜特隆分解中子源，包含在双光电倍增管构型中的目标闪光灯以及一系列脉搏形状歧义的观测闪烁体，在宽且连续的能量范围内测量了快速的塑料闪烁体的光线，以范围为大约50 kev的Proton回流能量。这项工作为在新兴中子成像方式中利用这些材料所需的事件重建算法提供了关键的输入。
Compact neutron imagers using double-scatter kinematic reconstruction are being designed for localization and characterization of special nuclear material. These neutron imaging systems rely on scintillators with a rapid prompt temporal response as the detection medium. As n-p elastic scattering is the primary mechanism for light generation by fast neutron interactions in organic scintillators, proton light yield data are needed for accurate assessment of scintillator performance. The proton light yield of a series of commercial fast plastic organic scintillators---EJ-200, EJ-204, and EJ-208---was measured via a double time-of-flight technique at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. Using a tunable deuteron breakup neutron source, target scintillators housed in a dual photomultiplier tube configuration, and an array of pulse-shape-discriminating observation scintillators, the fast plastic scintillator light yield was measured over a broad and continuous energy range down to proton recoil energies of approximately 50 keV. This work provides key input to event reconstruction algorithms required for utilization of these materials in emerging neutron imaging modalities.
