增强1英寸的时间响应。前缘法和恒分数法制备LaBr3（Ce）晶体
Enhanced time response of 1-in. LaBr3(Ce) crystals by leading edge and constant fraction techniques
摘要：
我们深入地研究了三种装有尺寸为1英寸的圆柱形LaBr $_{3}$（Ce）晶体的探测器的时间响应特性。在高度和1英寸。并且具有5%、8%和10%的标称Ce掺杂浓度。在$^{60}$ Co和$^{22}$ Na γ射线能量下对快速BaF $_{2}$参考探测器进行测量。通过选择光电倍增管的偏置电压和微调恒比放大器的参数，即过零和外部延迟，优化了时间分辨率。我们在这里报告的最佳时间分辨率的三个晶体。据观察，定时性能的影响的Ce掺杂量和晶体的均匀性。对于掺杂8% Ce的晶体，除了Hamamatsu R9779 PMT之外，在非常短的延迟下使用ORTEC 935 CFD使得有可能将LaBr $_{3}$（Ce）时间分辨率从60 Co光子能量下的最佳文献值提高到低于100 ps。
英文摘要：
We have characterized in depth the time response of three detectors equipped with cylindrical LaBr$_{3}$ (Ce) crystals with dimensions of 1-in. in height and 1-in. in diameter, and having nominal Ce doping concentration of 5%, 8% and 10%. Measurements were performed at $^{60}$Co and $^{22}$Na γ-ray energies against a fast BaF$_{2}$ reference detector. The time resolution was optimized by the choice of the photomultiplier bias voltage and the fine tuning of the parameters of the constant fraction discriminator, namely the zero-crossing and the external delay. We report here on the optimal time resolution of the three crystals. It is observed that timing properties are influenced by the amount of Ce doping and the crystal homogeneity. For the crystal with 8% of Ce doping the use of the ORTEC 935 CFD at very shorts delays in addition to the Hamamatsu R9779 PMT has made it possible to improve the LaBr$_{3}$(Ce) time resolution from the best literature value at 60Co photon energies to below 100 ps.
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