High Purity Germanium (HPGe) detectors are essential instruments in gamma-ray spectrometry, offering high sensitivity and exceptional energy resolution. The full-energy-peak (FEP) efficiency is a critical parameter that influences the accuracy of activity concentration measurements of radionuclides. This study examines the FEP efficiency of a coaxial HPGe detector, focusing on variations in crystal length, crystal radius, and crystal hole dimensions. For varying crystal lengths, the efficiency values show negligible differences at low energy (50 keV) but significant increases at higher energies, indicating that longer crystal lengths enhance efficiency. Similarly, the efficiency increases with larger crystal radii across all energy levels suggesting substantial efficiency gains even at low energies. However, variations in crystal hole radius and depth, exhibit minimal impact on FEP efficiency across all tested energy levels. These findings highlight that optimizing crystal length and radius is more crucial for changing detector efficiency compared to modifying hole dimensions, providing valuable insights for optimizing Monte Carlo models and detector design.

中文翻译：

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晶体参数对同轴高纯锗探测器能量范围 50 keV-2.5 MeV 全能量峰值效率影响的定量分析


高纯锗 （HPGe） 探测器是伽马射线能谱分析中必不可少的仪器，可提供高灵敏度和出色的能量分辨率。全能量峰值 （FEP） 效率是影响放射性核素活性浓度测量精度的关键参数。本研究检查了同轴 HPGe 探测器的 FEP 效率，重点关注晶体长度、晶体半径和晶体孔尺寸的变化。对于不同的晶体长度，效率值在低能量 （50 keV） 下差异可以忽略不计，但在较高能量下显着增加，表明较长的晶体长度提高了效率。同样，在所有能级上，晶体半径越大，效率就越高，这表明即使在低能量下也能显著提高效率。然而，晶孔半径和深度的变化对所有测试能级的 FEP 效率的影响很小。这些发现强调，与修改孔尺寸相比，优化晶体长度和半径对于改变探测器效率更为重要，为优化蒙特卡洛模型和探测器设计提供了有价值的见解。