LaCl3闪烁探测器在γ能谱测量中的应用

Application of Measurement of Gamma-ray Spectra by LaCl_3 Detector

用几个标准γ源对LaCl3和NaI闪烁体探测器的能量分辨率进行了刻度,并对测量的结果进行了比较,发现LaCl3探测器的分辨率要优于NaI探测器。为了得到精度较高的γ能谱,用EGSnrc计算了LaCl3探测器的能量响应函数,作为探测器的解谱响应矩阵。用探测器测量了152Eu标准γ源,逆矩阵法解谱后的γ能谱与HPGe谱仪测量结果以及标准值进行比较,发现LaCl3探测系统在能量线性、探测效率以及能量分辨方面都具有很好的性能,说明该探测器在γ能谱测量具有很好的应用前景。

The energy resolution of LaC13 and NaI detectors were calibrated with some standard gamma-ray sources. The results show that the energy resolution of LaCl3 detector is better than NaI detector. In order to get more precision gamma-ray spectrum, the pulse height spectrum for gamma-ray measured by LaCl3 detector will be unfolded by reverse-matrix. The energy response functions were simulated with EGSnrc code. The performance of LaCl3 for gamma-ray spectrum was tested using ^152 Eu. The result of test was compared with the measured spectrum of HPGe detector and standard spectrum, the agreement among them was good in energy linearity, detected efficiency and energy resolution, respectively. Therefore, it shows LaCl3 detector has a better application prospect in the measurement for gamma-ray spectra.