LaBr3(Ce,Sr)与NaI(Tl)晶体的本征分辨率研究
Study of the intrinsic resolution of LaBr3(Ce,Sr) and NaI(Tl) crystals
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中文总结 AI 辅助
本研究针对GECAM探测器的能量分辨率曲线拟合问题，对同批次1英寸LaBr3(Ce,Sr)与NaI(Tl)晶体开展对比实验，明确二者本征分辨率的主导贡献因素及数值，为相关探测器优化提供依据。
中文摘要 AI 辅助
引力波暴高能电磁对应体全天监测器（GECAM）采用大量LaBr3和NaI(Tl)晶体作为其伽马射线探测器的灵敏材料。为解决GECAM探测器地面定标中能量分辨率曲线的拟合问题，本工作对同一批次生产的1英寸LaBr3(Ce,Sr)和NaI(Tl)晶体的能量分辨率开展了全面测试与对比研究。研究采用硬X射线定标装置（HXCF）、光电倍增管单光电子定标系统以及Geant4蒙特卡罗模拟工具，量化了影响能量分辨率的7个因素。结果表明，各组分对能量分辨率的贡献存在差异，其中光电电子统计涨落和本征分辨率占主导地位。对于100 keV X射线，LaBr3(Ce,Sr)晶体的总能量分辨率为3.71%±0.03%（以1-σ表示），光电电子统计涨落的贡献为2.69%±0.00%，本征分辨率为2.45%±0.05%；NaI(Tl)晶体的总能量分辨率为4.41%±0.14%（以1-σ表示），光电电子统计涨落的贡献为3.20%±0.00%，本征分辨率为2.90%±0.21%。研究还探讨了本征分辨率的来源，结果显示LaBr3(Ce,Sr)晶体的本征分辨率主要源于发光非比例性，而NaI(Tl)晶体的本征分辨率主要源于能量转移过程中的涨落。本研究强调了精确且特定的实验测量与对比研究，证明两种因素均是本征分辨率的重要贡献者。
英文摘要
The Gravitational wave burst high-energy Elec?tromagnetic Counterpart All-sky Monitor (GECAM) utilizes a large number of LaBr3 and NaI(Tl) crystals as sensitive materials for its gamma-ray detectors. To address the fitting issues of the energy resolution curves in the ground calibration of the GECAM detectors, this work conducts a comprehensive testing and comparative study of the energy resolution of 1-inch LaBr3(Ce,Sr) and NaI(Tl) crystals produced from the same batch. We employed a Hard X-ray Calibration Facility (HXCF), a PMT single-photoelectron calibration system, and Geant4 Monte Carlo simulation tools to quantify seven factors influencing energy resolution. The results indicate that the contributions of various components to energy resolution differ, with pho?toelectron statistical fluctuations and intrinsic resolution being predominant. For 100 keV X-rays, the total energy resolution of the LaBr3(Ce,Sr) crystal is 3.71% \pm 0.03% (expressed as 1-σ), with a contribution from photoelectron statistical fluctuations of 2.69% \pm 0.00% and an intrinsic resolution of 2.45% \pm 0.05%. For 100 keV X-rays, the total energy resolution of the NaI(Tl) crystal is 4.41% \pm 0.14% (expressed as 1-σ), with a contribution from photoelectron statistical fluctuations of 3.20% \pm 0.00% and an intrinsic resolution of 2.90% \pm 0.21%. We discussed the sources of intrinsic resolution, and the results indicate that the intrinsic resolution of the LaBr3(Ce,Sr) crystal primarily arises from luminescence non-proportionality, while that of the NaI(Tl) crystal mainly stems from fluctuations during energy transfer. This study emphasizes precise and specific experimental measurements and comparative research, demonstrating that both factors are important contributors to intrinsic resolution.
