溴化镧/氯化镧电流型闪烁探测器性能研究

Performance of LaBr₃∶Ce/LaCl₃∶Ce Scintillation Detector in Current Mode

摘要: 掺铈溴化镧(LaBr₃∶Ce)及掺铈氯化镧(LaCl₃∶Ce)是近年来出现的性能优良的新型无机闪烁体。本文对LaBr₃∶Ce和LaCl₃∶Ce电流型闪烁探测器的性能进行了研究，计算了探测器的相对灵敏度随入射γ射线能量的变化曲线，测定了其对¹³⁷Cs和⁶⁰Co的灵敏度，并检验了其γ/n分辨本领。结果表明，溴化镧和氯化镧探测器具有较高的γ灵敏度响应和γ/n分辨，适于测量低强度快脉冲中子、γ混合场中的γ射线束。

Abstract: LaBr₃∶Ce and LaCl₃∶Ce which exhibit superior ability in detection of γ-rays have been studied extensively in recent years. The properties for both of the LaBr₃∶Ce scintillation detector and the LaCl₃∶Ce scintillation detector were studied. The relative sensitivities to incident γ-rays of different energy were obtained by calculation. The sensitivities of detectors to the ¹³⁷Cs and ⁶⁰Co sources were measured and the sensitivity ratio of γ-ray to neutron was inspected. The result shows that the LaBr₃∶Ce and LaCl₃∶Ce scintillation detectors with high sensitivities to γ-rays and good γ/n discrimination are very appropriate for measurement in the mixed field by neutrons and γ-rays.