根据NaI(Tl)闪烁探测器可用于单光子计数的特性, 探索了一种测量放射源入射下闪烁探测器脉冲电荷谱来实现其绝对灵敏度标定的方法。实验对标定系统的电荷数字转换记录器进行了绝对标定, 得到了用于ICF实验中重要诊断设备滤波-荧光谱仪的NaI(Tl)闪烁探测器的绝对灵敏度。灵敏度标定数据不确定度小于10%, 较传统的放射源标定方法(15%)显著提高, 同时标定能量范围扩大到100 keV以上。最后, 实验结果与Geant4模拟程序计算的结果进行了比对, 符合得较好。

This paper mainly introduced some researches about calibration of scintillators sensitivity using standard radio -active sources 241Am, 133Ba and 152Eu in Beijing Institute of Atomic Physics. As a scintillator could be used for single photon counting, are developed a new method to calibrate a scintillator’s sensitivity by measuring detectors’ charge spectrum with radioactive sources’ incidence. The experiment also calibrated QDC(quantity-to-digital convertor), and got the results of sensitivity for Filter-Fluorescer spectrometer in ICF experiments. The data’s uncertainty (10%) was lower than that with traditional methods (15%), and calibration energy range increased up to more than 100 keV. Finally, we compared experimental data with Geant4 simulating results, and they were in good accordance.