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HPGe探测器晶体尺寸及效率的研究
Study on Crystal Size and Detection E?ciency of HPGe Detector
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摘要: 采用蒙特卡罗方法模拟计算光子的探测效率需对高纯锗( HPGe )探测器进行准确的建模.模拟计算研究了HPGe晶体长度对探测效率的影响,并在空间不同的测量位置对放射源进行测量,将模拟计算与实验测量相结合,对探测器晶体的尺寸进行调整,获得了HPGe探测器晶体的模拟计算的准确尺寸,并在122～1332 keV能量范围内对模拟结果进行了验证.结果表明,在此能量范围内HPGe探测器的探测效率的模拟计算值与实验测量值的相对偏差大多数在5%内,并建立点源探测效率与探测器轴向距离的关系.Abstract: The accurate shape of HPGe detector is needed in order to calculate its detection e?ciency with Monte Carlo methods. In our calculation, the influence of the HPGe crystal size on e?ciency has been investigated; the final crystal sizes were determined by comparison with experiments and were validated by the experimental e?ciency obtained at several source-to-detector positions. The results show that when the crystal dimensions determined are used to calculate the detection e?ciency in the energy range 122～1 332 keV, the relative deviations between simulated and most experi-mental results were within 5%. In addition, the relationship between detection e?ciency and axial distance to detector was established.
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