Department of Nuclear Engineering, Ulsan National Institute of Science and Technology, 50, UNIST-gil, Ulsan, Republic of Korea.
Department of Nuclear Engineering, Ulsan National Institute of Science and Technology, 50, UNIST-gil, Ulsan, Republic of Korea.
Appl Radiat Isot. 2023 Feb;192:110597. doi: 10.1016/j.apradiso.2022.110597. Epub 2022 Dec 5.
In this study, Monte Carlo simulations were used to calculate the full-energy peak efficiency of a p-type coaxial high-purity germanium (HPGe) detector. The HPGe detector was modeled using MCNP6 and Geant4, and the thickness of the dead layer of germanium crystals was estimated for an accurate simulation. The dead layer was divided into front and side components, where a point source and a Marinelli beaker source were used to estimate each dead layer thickness. The model was validated by comparing the simulated as well as experimental results for the standard sources of cylindrical and Marinelli beakers. The Geant4 results and experimental results matched up to 4% in the 59.54-1836.05 keV energy range, while MCNP6 matched up to 6% when adjusted for coincidence summing effects. HPGe detector modeled in Monte Carlo simulations can be utilized for experimental validation and experimental setup prior to using actual HPGe detectors.
在这项研究中，我们使用蒙特卡罗模拟计算了 p 型同轴高纯锗（HPGe）探测器的全能量峰效率。使用 MCNP6 和 Geant4 对 HPGe 探测器进行建模，并估计了锗晶体死层的厚度，以进行准确的模拟。死层被分为前和侧两个部分，使用点源和 Marinelli 烧杯源来估计每个死层的厚度。通过比较圆柱形和 Marinelli 烧杯标准源的模拟和实验结果对模型进行了验证。在 59.54-1836.05keV 的能量范围内，Geant4 结果与实验结果的吻合度达到了 4%，而当调整符合计数求和效应时，MCNP6 的吻合度达到了 6%。可以在使用实际的 HPGe 探测器之前，使用蒙特卡罗模拟来对 HPGe 探测器进行建模，以进行实验验证和实验设置。
