γ全能峰右高左低现象理论分析

用HPGe1，谱仪对高活度放射性样品进行测量时，在能谱中出现了全能峰右侧明显高于左侧的现象，为准确定量分析γ放射性核素带来困难。通过理论分析，详细解释了该现象产生的原因，实验验证了理论分析结论是正确的。分析结果表明，全能峰右侧高于左侧的现象主要由偶然符合效应引起，并且总体上全能峰左右两侧高度的比值随死时间增大先增后减，当死时间小于等于1．O％时，全能峰左右两侧高度近似相等，当死时间位于1．0％-4．0％时，峰左右高度比值随死时间而增大，当死时间位于4．0％-56％时，峰左右高度比值随死时间增加而减小。并通过实验结果与LabSOCS计算结果对比，显示右高左低这种现象并不会对点源的能谱测量造成影响...

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Bibliographic Details
Published in核技术 Vol. 41; no. 1; pp. 50 - 54
Main Author 刘文彪;陈伟;田自宁;王雪梅;苏川英;冯天成
Format Journal Article
LanguageChinese
Published 西北核技术研究所 西安 710024 10.01.2018
Subjects
γ能谱
偶然符合
全能峰
γ能谱
偶然符合
全能峰
γ spectrometry
Full-energy peak
Accidental coincidence
Online AccessGet full text
ISSN0253-3219
DOI10.11889/j.0253-3219.2018.hjs.41.010501

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Summary:用HPGe1，谱仪对高活度放射性样品进行测量时，在能谱中出现了全能峰右侧明显高于左侧的现象，为准确定量分析γ放射性核素带来困难。通过理论分析，详细解释了该现象产生的原因，实验验证了理论分析结论是正确的。分析结果表明，全能峰右侧高于左侧的现象主要由偶然符合效应引起，并且总体上全能峰左右两侧高度的比值随死时间增大先增后减，当死时间小于等于1．O％时，全能峰左右两侧高度近似相等，当死时间位于1．0％-4．0％时，峰左右高度比值随死时间而增大，当死时间位于4．0％-56％时，峰左右高度比值随死时间增加而减小。并通过实验结果与LabSOCS计算结果对比，显示右高左低这种现象并不会对点源的能谱测量造成影响。
Bibliography:LIU Wenbiao CHEN Wei TIAN Zining WANG Xuemei SU Chuanying FENG Tiancheng （Northwest Institute of Nuclear Technology, Xi ＂an 710024, China）
31-1342/TL
γspectrometry, Full-energy peak, Accidental coincidence
[Background] The phenomenon that right is higher than left in full-energy peak of the y spectnma in the high active sample using HPGe gamma-ray spectrometry in laboratory, brings error into the gamma-radioactive nuclide analysis. [Purpose] This paper aims to explain the phenomenon to realize accurate quantitative analysis. [Methods] The theoretical formula of the right-to-left ratios was developed, and experiment was designed to prove it. [Results] The experiment indicates that the theoretical calculation is right. The research achievement shows that the phenomenon is caused by accidental coincidence. [Conclusion] The right-to-left ratios increase first, then decrease with the higher dead time. When the dead time is lower than 1.0%, the right is approximate equal to the left in full energy peak. With the dead
ISSN:0253-3219
DOI:10.11889/j.0253-3219.2018.hjs.41.010501