MC模拟高纯锗探测器准直器对X射线能谱测量的影响

doi:10.3969/j.issn.1000-1158.2021.02.18

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摘要为了研究不同限束光阑准直器对测量结果的影响,使用MCNP5蒙卡模拟软件建立带准直器的高纯锗探测器模型。通过模拟分析准直器各项参数对高纯锗探测器测量X射线能谱的影响,确立了准直器的最佳尺寸,为实验室使用高纯锗探测器测量X射线能谱提供一定的参考依据。计算了透射等效孔径(TEA)准直器指标,分析了高纯锗探测器测量X射线得到的探测效率。结果表明:对于能量小于80keV的低能量段X射线能谱测量,选择孔径小、屏蔽厚的准直器;对于80keV以上中高能量段的X射线应选择较大孔径的准直器,以避免由于从铅准直器中产生小角散射线和铅的特征线而影响X射线能谱的质量。

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	文玉琴
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	王二彦

关键词 ：计量学, X射线能谱, 高纯锗探测器, 准直器, TEA, MCNP5

Abstract：To study the influence of different beam-limiting aperture collimators on the measurement results, MCNP5 simulation software was used to establish a high-purity germanium detector model with a collimator, and various parameters of the collimator were used to simulate and analyze the impact of the collimator on the high-purity germanium detector. Measuring the influence of the X-ray energy spectrum to establish the optimal size of the collimator, and provide a certain reference basis for the laboratory to use the high purity germanium detector to measure the X-ray energy spectrum. The transmission equivalent aperture (TEA) collimator index was calculated, the detection efficiency of X-ray measured by HPGe detector was analyzed. The results showed that the collimator with small aperture and thick shield should be selected for the low-energy X-ray energy spectrum measurement with energy less than 80keV, and the collimator with larger aperture should be selected for the medium and high-energy X-ray with energy more than 80keV, so as to avoid the influence of the quality of X-ray energy spectrum due to the generation of small angular scattered rays and lead characteristic lines from the lead collimator.

Key words： metrology X-ray energy spectrum high purity germanium detector collimator TEA MCNP5

收稿日期: 2020-08-07 发布日期: 2021-02-18

PACS:

TB98

基金资助:国家重点研发计划(2017YFF0205101)

通讯作者: 吴金杰(1981-),男,浙江东阳人,中国计量科学研究院研究员,主要从事辐射计量研究。Email: wujj@nim.ac.cn E-mail: wujj@nim.ac.cn

作者简介: 文玉琴(1994-),女,四川遂宁人,成都理工大学和中国计量科学研究院联合培养硕士研究生,研究方向为环境辐射监测。Email: 1415010709@qq.com

引用本文:

文玉琴,赵瑞,吴金杰,赖万昌,王二彦. MC模拟高纯锗探测器准直器对X射线能谱测量的影响[J]. 计量学报, 2021, 42(2): 245-249.
WEN Yu-qin,ZHAO Rui,WU Jin-jie,LAI Wan-chang,WANG Er-yan. MC Simulation of the Effect of High Purity Germanium Detector Collimator on X-ray Energy Spectrum Measurement. Acta Metrologica Sinica, 2021, 42(2): 245-249.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2021.02.18 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2021/V42/I2/245

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