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	HPGe探测器对圆形面源探测效率的研究
	张小林 ; 余功硕 ; 李元景 ; 许启初 ; 解峰 ; 白涛 ; ZHANG Xiaolin ; YU Gongshuo ; LI Yuanjing ; XU Qichu ; XIE Feng ; BAI Tao
	2016-03-30 ; 2016-03-30
关键词	高纯锗(High Purity Germanium,HPGe)探测器 圆形面源 探测效率 High Purity Germanium(HPGe) detector Disc source Detecting efficiency TL81
其他题名	Study of HPGe detector peak efficiency by disc source
中文摘要	实验刻度了GEM60P4型高纯锗(High Purity Germanium,HPGe)探测器在H=250mm处对三种圆形面源(φ24 mm、φ80 mm和φ90 mm)的峰探测效率,结果表明,这三种源的效率基本一致。采用MCNP模拟了φ40–160mm内的圆形面源效率,研究了探测效率随样品直径的变化关系,并采用Geant4计算了圆形面源对同轴探测器的有效立体角。对φ90mm以上的样品源,探测效率随源直径的增大在逐渐减小,且高能γ射线效率减小程度较快,需采用标准源进行效率刻度。; Background: Calibrating the detection efficiency accurately is the key process to the disc filter sample activity detected by High Purity Germanium(HPGe) gamma spectrometer, and the diameter of the disc filter source is varied with the specification of the sampler filter. Purpose: To study further the relation between detection efficiency and the source size, the HPGe detector peak efficiency(relative detective efficiency is 60%) was performed for disc sources with diameters of 24 mm, 80 mm and 90 mm, respectively. Methods: The efficiency and the solid angle for disc source with diameter ranging 40–160 mm were simulated using the MCNP and the Geant4. Results: The result shows that the detecting efficiency of three sources is consistent, and the efficiency gradually decreases with the increasing size of the disc source with diameter greater than 90 mm. Conclusion: The efficiency for disc sources with diameter less than 90 mm is directly calibrated by the standard point sources, while for disc sources with diameter larger than 90 mm which is needed to be calibrated by the standard disc sources.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/143215]
专题	清华大学
推荐引用方式 GB/T 7714	张小林,余功硕,李元景,等. HPGe探测器对圆形面源探测效率的研究[J],2016, 2016.
APA	张小林.,余功硕.,李元景.,许启初.,解峰.,...&BAI Tao.(2016).HPGe探测器对圆形面源探测效率的研究..
MLA	张小林,et al."HPGe探测器对圆形面源探测效率的研究".(2016).

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