BaF_2闪烁体探测器信号数字化方法研究

Digital Method on Signals of BaF_2 Scintillator Detectors

应用数字化方法对BaF2闪烁体探测器脉冲信号进行了研究,信号的测量通过FADC和计算机系统实现,并对所采集的脉冲波形进行了离线分析。通过计算脉冲波形的面积提取了射线的能量信息,重建了能谱,并与传统电子学模拟信号测量方法得到的能谱进行了比较;应用过阈定时方法提取了脉冲的时间信息,测量并给出了4πBaF2探测器系统的时间分布谱;应用脉冲形状甄别法对α粒子和γ射线进行了鉴别研究,根据脉冲信号快/慢成分比的差别清楚地将α粒子从γ射线中鉴别开来。本工作为在γ全吸收型4πBaF2探测器系统中应用FADC进行多通道、多参数、大数据量数字化数据获取积累了经验。

Anode signals of the BaF2 detectors were acquired using the Flash ADC com- bined with the computer system. The leading edge time distribution of the wave forms and the energy spectra of 137 Cs and 60 Co sources were obtained by off-line data analysis. particles and 7 rays were identified simply by the pulse shape discrimination. The en- ergy resolutions of the spectra of the digital method are as equal as that of the traditional methods.