大面积LaBr_3:Ce闪烁探测器伽马灵敏度和时间响应测量

在~(60)Co放射性标准源场中,对国内新研制的大面积LaBr_3∶Ce闪烁探测器伽马灵敏度进行了测量,并用GD100光电管分别与LYSO:Ce、ST401闪烁体构成闪烁探测器的伽马灵敏度进行了对比分析;应用CΓC-67型三通道的ns快脉冲辐射源对这种大面积新型闪烁晶体本身的时间响应特性进行了测量。实验测量结果表明:直径76 mm的大面积LaBr_3∶Ce闪烁探测器伽马灵敏度与LYSO∶Ce、ST401闪烁探测器的同体积归一灵敏度比分别超过5和200;时间响应前沿2.56 ns,后沿56 ns,半高宽23.56 ns,衰减时间25.45 ns。

Measurement of γ Sensitivity and Time Response of the Large Area LaBr3∶Ce Scintillation Detector

The γ sensitivity of a large area LaBr3∶Ce scintillation detector was measured in a 60Co standard source field, and was compared with the sensitivities of scintillation detectors which were made up of GD100 photoelectric tube and LYSO∶Ce or ST401 scintillator, the time response waveform of this LaBr3∶Ce scintillator was measured with a nanosecond pulse radiation source.As is shown in the measuring results, the ratio of volume normalized sensitivity of the LaBr3∶Ce scintillator to those of LYSO∶Ce scintillator and ST401 scintillator is bigger than 5 and 200, respectively.The front edge, full width at half maximum (FWHM), back edge and decay time evaluated from the measured time response waveform of the LaBr3∶Ce scintillator are 2.56 ns, 56 ns, 23.56 ns and 25.45 ns, respectively.