Monte Carlo模拟方法在~(133)Xe活度绝对测量中的应用
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摘要
为提高符合效率外推法测量~(133) Xe活度的准确度,提出一种基于Geant4软件包的蒙特卡罗理论模拟方法,通过理论预测~(133) Xe活度测量的效率外推曲线和活度,确定了最佳的测量条件和数据拟合函数。使用4πβ(PS)-4πγ(NaI)符合测量系统,绝对测量了~(133) Xe活度,并与利用HPGeγ谱仪的测量结果进行了比较,验证了MC模拟方法预测的可靠性。
In order to improve measurement accuracy of ~(133)Xe activity by the coincidence efficiency extrapolation technique,A Monte Carlo simulation method based on Geant4 software is proposed.By predicting the efficiency extrapolation curve and activity of ~(133)Xe,the optimal measurement conditions and data fitting function are determined.The activity of ~(133)Xe is determined absolutely by 4πβ(PS)-4πγ(NaI)coincidence measurement system,and is compared with the measurement results obtained by using HPGeγspectrometry system.The experiment data show that the results predicted by Monte Carlo simulation are reliable.
In order to improve measurement accuracy of ~(133)Xe activity by the coincidence efficiency extrapolation technique,A Monte Carlo simulation method based on Geant4 software is proposed.By predicting the efficiency extrapolation curve and activity of ~(133)Xe,the optimal measurement conditions and data fitting function are determined.The activity of ~(133)Xe is determined absolutely by 4πβ(PS)-4πγ(NaI)coincidence measurement system,and is compared with the measurement results obtained by using HPGeγspectrometry system.The experiment data show that the results predicted by Monte Carlo simulation are reliable.
引文
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[2]BOWYER T W,SCHLOSSER C,ABEL K H,et al.Detection and analysis of xenon isotopes for the comprehensive nuclear test-ban treaty international monitoring system[J].JEnv Radioac,2002,59:139-151.
[3]RINGBOM A,LARSON T,AXELSON A,et al.SAUNA-A system for automatic sampling,processing,and analysis of radioactive xenon[J].Nucl Instrum Methods Phys Res A,2003,508(3):542-553.
[4]FONTAINE J P,POINTURIER F,BLANCHARDX,et al.Atmospheric xenon radioactive isotope monitoring[J].J Env Radioact,2004,72(1/2):129-135.
[5]解峰,何小兵,姜文刚,等.133 Xe气体放射性浓度的绝对测定[J].核技术,2009,32(10):747-750.(XIE Feng,He Xiao-bing,JIANG Wen-gang,et al.Absolute measurement of radiaoactive gas concentration of 133 Xe[J].Nuclear Techniques,2009,32(10):747-750.)
[6]BAERG A P.The efficiency extrapolation method in coincidence counting[J].Nuclear Instrum Methods,1973,112(1/2):143-150.
[7]XIE F,HE X B,JIANG W G,et al.Development of a radio xenon measurement system and its application in monitoring Fukushima nuclear accident[J].Radiation Physics and Chemistry,2014,97:85-89.
[8]FIRESTONE R B,SHIRLEY V S.Table of Isotopes[M/CD]8th ed,Whiley-VCH,1996.
[9]AGOSTINELLI S,ALLISON J,AMAKO K,et al.GEANT4A simulation toolkit[J].Nucl Instrum Methods Phys Res A,2003,506(3):250-303.
[10]CERN.Geant4Collaboration Geant4 User's Guide for Application Developers[M/OL].Version:Geant4,2012.
[11]BRUN R.Rootuser's guide[EB/OL].[2013-5].http://root.cern.ch/root/html534/guides/users-guide/ROOTUsersGuideA4.pdf.