中文摘要：

研制了一种数字式三检测器-正电子寿命谱仪。它由一个DRS4波形数字化板和三LaBr3闪烁探测器耦合XP2020Q光电倍增管。DRS4波形数字化允许数据在5 GSPS采样幅值高分辨率，具有良好的时间尺度的线性度和稳定性。在三重合，新的系统可以达到195皮秒的时间分辨率，这是比传统的模拟装置，具有相同的检测器。该仪器可应用于其他闪烁的定时测量皮秒精度。

英文摘要：

A digital three-detector positron lifetime spectrometer was developed. It consists of a DRS4 waveform digitizing board and three LaBr3 scintillation detectors coupled to XP2020Q photomultiplier tubes. DRS4 waveform digitizing allows data sampling at up to 5 GSPS with high amplitude resolution, with good time scale linearity and stability. In the triple-coincidence, the new system could reach a 195 ps time resolution, which is better than the conventional analog apparatus with the same detectors. This spectrometer can be applied to the other scintillation timing measurements with picoseconds accuracy.