一种新型溴化铈闪烁体探测器性能研究

摘要

The scintillator detector plays an important role in the detection of ray energy and arrival time.Aiming at the new domestic cerium bromide(CeBr3)scintillator crys-tal,the experimental system for testing its key performance was established.A fast-coincident timing resolution measurement device was established,and it's found that the timing resolution of the new scintillator detector is 142 ps.And the results show that the decay time of the cerium bromide crystal is 16.8 ns and the rise time is 0.18 ns.The relative light output measurement device was established and tested to obtain the relative light output to NaI(Tl),and the relative light output of the cerium bromide crystal scintillator detector is 161% for 661.66 keV energy ray.At the same time,the energy response of the detector was measured,and the energy resolution is 4.7% for 661.66 keV energy ray.The performance of the novel scintillator crystals made in China was compared with that of aboard cerium bromide crystal and other kinds of scintillator crystals,such as barium fluoride,lanthanum bromide and sodium iodide,and its appli-cation prospect was discussed.%闪烁探测器在射线能量与时间的探测中发挥着重要作用.针对国产新型溴化铈(CeBr3)闪烁晶体,本文建立实验系统和方法对其关键性能指标进行了测试,具体包括:建立了快符合时间分辨系统测量装置,测试得到新型闪烁探测器对于60Co源的时间分辨率为142ps;建立了单光子计数法测量装置,测试得到溴化铈晶体的衰减时间为16.8ns,上升时间为0.18ns;建立了相对光输出测量装置,测试得到其相对于同规格NaI(Tl)闪烁体探测器对于661.66keV射线的光输出为161%;同时针对其能量响应性能进行了测试,测得对于661.66keV射线其能量分辨率为4.7%.将国产新型溴化铈闪烁晶体的性能测试结果与国际上同类晶体以及氟化钡、溴化镧、碘化钠等常用无机闪烁体的性能进行了比较,对其应用前景进行了探讨.