掺锂塑料闪烁体的制备与性能  

Preparation and Characterization of Lithium-doped Plastic Scintillator

作　　者：冯嘉傲 覃甜甜 徐业伟[1] 任洪波[2] 张林[2,3] 霍冀川[1] FENG Jiaao;QIN Tiantian;XU Yewei;REN Hongbo;HUO Jichuan;ZHANG Lin(School of Materials Science and Engineering, Southwest University of Science and Technology,Mianyang 621010, Sichuan, China;Joint Laboratory for Extreme Conditions Matter Properties,Southwest University of Science and Technology, Mianyang 621010, Sichuan, China;Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion,China Academy of Engineering Physics, Mianyang 621900, Sichuan, China)

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]西南科技大学极端条件物质特性实验室,四川绵阳621010 [3]中国工程物理研究院激光聚变研究中心等离子体物理重点实验室,四川绵阳621900

出　　处：《西南科技大学学报》2018年第4期20-24,共5页Journal of Southwest University of Science and Technology

基　　金：西南科技大学研究生创新基金资助(17ycx009);四川省大学生创新创业训练计划项目(201710619030)

摘　　要：为了提高塑料闪烁探测器对低能中子的探测灵敏度,可在塑料闪烁体中引入热捕获截面积较大的6Li。通过酸碱中和反应合成了甲基丙烯酸锂,对其进行了结构表征,随后将其溶解到甲基丙烯酸中,并将甲基丙烯酸溶液转移至溶有第一闪烁物质和移波剂的苯乙烯溶液中,通过热聚合的方法制备出掺锂塑料闪烁体。所得闪烁体的最大掺锂质量分数为0. 89%,且随着掺锂量的增多,闪烁体的荧光性能逐渐降低;相对于蒽晶体,最大掺锂量的闪烁体的光产额为46. 27%;最大掺锂量塑料闪烁体的衰减时间为1. 64 ns。6Li with a large thermal capture interface is introduced into the plastic scintillator to improve the detection sensitivity of the detector to the low-energy neutron.Lithium methacrylate was first synthesized by acid-base neutralization and its structure was characterized.Then lithium methacrylate was dissolved into methacrylic acid,and the generated solution was transferred to a styrene solution containing the primary additive and wavelength shifter.Finally,lithium-doped plastic scintillator was prepared by thermal polymerization.The maximum lithium content of the plastic scintillator was0.89%.With the increase of lithium content,the fluorescence intensity of plastic scintillator gradually decreased.The light yield of the scintillator with the maximum content of lithium was46.27%relative to the value of the anthracene crystal,and the decay time was1.64ns.

关 键 词：甲基丙烯酸锂 掺锂塑料闪烁体 荧光性能 光产额 衰减时间 

分 类 号：TL812.1[核科学技术—核技术及应用]