延迟符合法分辨氡同位素仿真研究
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摘要
镭同位素[1]示踪在海洋学研究中具有广泛的应用,例如,研究近岸和河口海区1—10天的海洋学过程等。利用逻辑电路延迟符合测量氡同位素[2]是间接分辨镭同位素的重要手段,目前该方法已成为海洋学研究的重要方法之一。本文研究了以软件仿真方式产生氡及其同位素的仿核脉冲数据,探索用软件方法实现延迟符合法分辨氡同位素;该方法可以灵活方便改变延迟时间和开门时间寻找具有较好的分辨效果,仿真了不同粒子总数及不同AR活度比情况下的延迟符合测氡的参数设置。发现开门时间为氡同位素子体半衰期的3-5倍较为合适,并与国外文献试验中测量结果的进行了比对,结果显示,该方法可降低测量成本,延迟时间调整方便,对低水平活度氡同位素测量具有借鉴作用。
同时对数字符合进行了初步的研究,仿真[3]研究了模数转换器的采样速率和采样位数对双指数核脉冲信号的影响,并采用四种带通滤波器算法对数字化双指数[4]核脉冲信号进行了滤波成形研究,通过研究发现,椭圆滤波器[6]对高频噪声的滤波效果较好。
Radium isotopes study have an wide application in the field of oceanography, for example, study on the oceanography process of estuarine area and nearshore within 1-10 days etc. we can indirectly measure radium isotopes by logic delayed circuit which can directly measure and discriminate radon isotopes, and this method is an important means of measure radium isotopes in oceanography. In this paper we seek to generate pseudo nuclear pulse data of radon and radon isotopes by the way of software. and using MATLAB software simulate the delay coincidence to study“Ra.De.CC”, This method can conveniently change the delay time and the gate time for finding a better effect . simulation the delay and gate parameters with different particles numbers and AR activity ratio. Finding that, the appropriate gate time is 3-5 times of the half-life of radon daughters, and checking with foreign measuring results in literature, the result shows that this method can reduce the cost of measurement, easily change, is a reference for measuring low level radon isotope.
At the same time ,we have a study on the digital delay coincidence, for example the ADC sampling rate and sampling bit for the double exponential nuclear pulse signal. simulate four types bandpass filter, and through the research we found that the effect of elliptic filter for high-frequency noise is better for digital double exponential nuclear pulse signal.
同时对数字符合进行了初步的研究,仿真[3]研究了模数转换器的采样速率和采样位数对双指数核脉冲信号的影响,并采用四种带通滤波器算法对数字化双指数[4]核脉冲信号进行了滤波成形研究,通过研究发现,椭圆滤波器[6]对高频噪声的滤波效果较好。
Radium isotopes study have an wide application in the field of oceanography, for example, study on the oceanography process of estuarine area and nearshore within 1-10 days etc. we can indirectly measure radium isotopes by logic delayed circuit which can directly measure and discriminate radon isotopes, and this method is an important means of measure radium isotopes in oceanography. In this paper we seek to generate pseudo nuclear pulse data of radon and radon isotopes by the way of software. and using MATLAB software simulate the delay coincidence to study“Ra.De.CC”, This method can conveniently change the delay time and the gate time for finding a better effect . simulation the delay and gate parameters with different particles numbers and AR activity ratio. Finding that, the appropriate gate time is 3-5 times of the half-life of radon daughters, and checking with foreign measuring results in literature, the result shows that this method can reduce the cost of measurement, easily change, is a reference for measuring low level radon isotope.
At the same time ,we have a study on the digital delay coincidence, for example the ADC sampling rate and sampling bit for the double exponential nuclear pulse signal. simulate four types bandpass filter, and through the research we found that the effect of elliptic filter for high-frequency noise is better for digital double exponential nuclear pulse signal.
引文
[1] S.M.Buckman.D.Lus .Digital coincidence counting. Nuclear Instruments and Methods in Physics Research. Section A368-374. (1996)
[2] Willard S.Moore and Ralph Arnold. Measurement of 223Rn and 224Rn in coastal waters using a delayed coincidence counter. Journal of Geophysical Research.vol.101.NO.C1.Pages 1321-1329,january 15/1996.
[3] Wai Phyo Aung .AnalysisonModelingandSimulink of DC Motor and its Driving System Used for WheeledMobile Robot .Winter 2008
[4]张软玉.数字化核能谱获取系统的研究.中国博士论文全文数据库.2006
[5] R. Madhusudhanan .Digital Simulation of ZVS DC to DC Converter UsingSimulink .European Journal of Scientific Research .Vol.23No.2 (2008),
[6]吴四清,熊钢.基于Simulink的数字滤波器系统仿真与分析.咸宁学院学报.第28卷第6期2008年12月
[7] R. Madhusudhanan and S. Rama Reddy .Digital Simulation of ZVS DC to DC Converter Using Simulink .European Journal of Scientific Research .Vol.23No.2 (2008), pp.317-329.
[8]诸洪达,王孟才.环境样品中镭同位素分析测定方法.国际放射医学核医学杂志. 1980-03-004
[9]苟全录.氡及其子体测量方法简介.辐射防护通讯.1994年第14卷第6期
[10]李蓉.氡及其子体研究动态.Chin J Radiol Health .1999 ,Vol 8 ,No 2
[11]贾文,彭方方,周蓉生,马英杰,邱元德,候新生,吴允平,祖秀兰,王小琴.氡及其子体运移规律与机理
[12]何志杰,乐仁昌,叶全意,洪锦泉,陈健.氡及其子体运移模型的可视化技术.工业控制计算机.2008年21卷第12期.
[13]程敏熙.符合测量实验方法研究.大学物理.第21卷第6期2002年6月.
[14]李东仓,李庆,杨磊,衰树林,杨映辉.多模式仿核脉冲随机信号发生器研究.兰州大学学报自然科学版.第43卷第3期2007年6月
[15]李东仓,杨磊,袁树林,杨映辉,张福甲.仿核脉冲的随机信号发生器研究.核电子学与探测技术.第27卷第2期2007年3月
[16]过雅南,金大鹏,乔巧,赵棣新,刘振安.随机脉冲发生器.核电子学与探测技术.第27卷第2期
[17]辛茜,曾晓洋,张国权.真随机数发生器的系统建模与仿真[J] .系统仿真学报.2005, 17(1): 53-56
[18]Pierre L'Ecuyer .UNIFORM RANDOM NUMBER GENERATORS: A REVIEW .Proceedings of the 1997 .Winter Simulation Conference.
[19] Liang Heng Liu Qinghua Bai Fengshan .A CLASS OF RANDOM NUM BEGENERATORS BASED ON WEYL SEQUENCE. App1.Math.J.Chinese Univ.Ser.B 2005,20(4):483—490研究,核技术.Vol .23,No.3,March,2000.
[20]王莱,刘松强.真随机数发生器的设计和实现[J] .核电子学与探测技术.1998, 18(6): 452-455.
[21]闫晓明.数字存储示波器的研制.中国优秀硕士学位论文全文数据库.2007.2(093149)..1(189311).
[22] Charles Giffin,Aaron Kauman and Wallace Broecker. Delayed Coincidece Counter for the Assay of Action and Thoron .Journal of Geophysical research.Vol.68.NO.6.March 15/1963
[23]严晓兰.基于Simulink的信号与系统仿真实验研究.实验科学与技术.第6卷第6期
[24] George Bernarde .A MATLAB-based Framework for Engineering DesignEvaluationvia Virtual Prototyping .Bachelor of Engineering (Computer Systems) .October, 2004
[25]韩芝侠.基于Matlab /Simulink仿真的电力电子实验系统设计与实现.陕西理工学报.2008年6月第24卷第2期
[26]梁金千,张跃.在计算机上产生真随机数的探讨[J].计算机工程.2003, 29(15): 176-177.
[27]王丽君,赵修良.核电子学用随机脉冲信号发生器的方案设计.山西电子技术.2007年第2期
[28]滕建辅,梁静毅,滕颖.对数正态分布伪随机数的产生与检验.天津商学院学报.第27卷第6期2007年11月
[29]俞俊,沈海斌,严晓浪.基于混沌的高速真随机数发生器的设计与实现[J].半导体学报.2004, 25(8): 1013-1018.
[30]彭朝华,吴小光,李广生.放射性活度的符合测量.原子能科学技术.第35卷第3期2001年5月
[31] E. Garcia-solsona , J. Garcia-Orellana , P. Masque, H. Dulaiova . Uncertainties associated with 223Ra and 224Ra measurements in water via a Delayed Coincidence Counter(RaDeCC). Marine Chemistry 109 (2008) 198 -219
[32] B.L.Dickson. R.L.Meakins.C.J.Bland.刘珊珊.利用地下水中镭同位素对放射性异常的评价.世界核地质科学.1985-02-012
[33]张燮.天然水中铀钍镭同位素比值的测定.东华理工学院学报.1981-01-009
[34] Amer C. Hamdan, Juberty A. de Souza, Orlando F. A. Bueno .PERFORMANCE OF UNIVERSITYSTUDENTS ON RANDOM NUMBER GENERATION AT DIFFERENT RATES TO EVALUATE EXECUTIVE FUNCTIONS .Arq Neuropsiquiatr ;62 (1):58-60,2004
[35] Heikki Hurskainen,Elena Simona Lohan, Xuan Hu,Jussi Raasakka, and Jari Nurmi .Multiple Gate Delay Tracking Structures for GNSS Signals and Their Evaluation with Simulink, SystemC, and VHDL .International Journal of Navigation and Observation .Volume 2008, Article ID 785695, 17 pages
[2] Willard S.Moore and Ralph Arnold. Measurement of 223Rn and 224Rn in coastal waters using a delayed coincidence counter. Journal of Geophysical Research.vol.101.NO.C1.Pages 1321-1329,january 15/1996.
[3] Wai Phyo Aung .AnalysisonModelingandSimulink of DC Motor and its Driving System Used for WheeledMobile Robot .Winter 2008
[4]张软玉.数字化核能谱获取系统的研究.中国博士论文全文数据库.2006
[5] R. Madhusudhanan .Digital Simulation of ZVS DC to DC Converter UsingSimulink .European Journal of Scientific Research .Vol.23No.2 (2008),
[6]吴四清,熊钢.基于Simulink的数字滤波器系统仿真与分析.咸宁学院学报.第28卷第6期2008年12月
[7] R. Madhusudhanan and S. Rama Reddy .Digital Simulation of ZVS DC to DC Converter Using Simulink .European Journal of Scientific Research .Vol.23No.2 (2008), pp.317-329.
[8]诸洪达,王孟才.环境样品中镭同位素分析测定方法.国际放射医学核医学杂志. 1980-03-004
[9]苟全录.氡及其子体测量方法简介.辐射防护通讯.1994年第14卷第6期
[10]李蓉.氡及其子体研究动态.Chin J Radiol Health .1999 ,Vol 8 ,No 2
[11]贾文,彭方方,周蓉生,马英杰,邱元德,候新生,吴允平,祖秀兰,王小琴.氡及其子体运移规律与机理
[12]何志杰,乐仁昌,叶全意,洪锦泉,陈健.氡及其子体运移模型的可视化技术.工业控制计算机.2008年21卷第12期.
[13]程敏熙.符合测量实验方法研究.大学物理.第21卷第6期2002年6月.
[14]李东仓,李庆,杨磊,衰树林,杨映辉.多模式仿核脉冲随机信号发生器研究.兰州大学学报自然科学版.第43卷第3期2007年6月
[15]李东仓,杨磊,袁树林,杨映辉,张福甲.仿核脉冲的随机信号发生器研究.核电子学与探测技术.第27卷第2期2007年3月
[16]过雅南,金大鹏,乔巧,赵棣新,刘振安.随机脉冲发生器.核电子学与探测技术.第27卷第2期
[17]辛茜,曾晓洋,张国权.真随机数发生器的系统建模与仿真[J] .系统仿真学报.2005, 17(1): 53-56
[18]Pierre L'Ecuyer .UNIFORM RANDOM NUMBER GENERATORS: A REVIEW .Proceedings of the 1997 .Winter Simulation Conference.
[19] Liang Heng Liu Qinghua Bai Fengshan .A CLASS OF RANDOM NUM BEGENERATORS BASED ON WEYL SEQUENCE. App1.Math.J.Chinese Univ.Ser.B 2005,20(4):483—490研究,核技术.Vol .23,No.3,March,2000.
[20]王莱,刘松强.真随机数发生器的设计和实现[J] .核电子学与探测技术.1998, 18(6): 452-455.
[21]闫晓明.数字存储示波器的研制.中国优秀硕士学位论文全文数据库.2007.2(093149)..1(189311).
[22] Charles Giffin,Aaron Kauman and Wallace Broecker. Delayed Coincidece Counter for the Assay of Action and Thoron .Journal of Geophysical research.Vol.68.NO.6.March 15/1963
[23]严晓兰.基于Simulink的信号与系统仿真实验研究.实验科学与技术.第6卷第6期
[24] George Bernarde .A MATLAB-based Framework for Engineering DesignEvaluationvia Virtual Prototyping .Bachelor of Engineering (Computer Systems) .October, 2004
[25]韩芝侠.基于Matlab /Simulink仿真的电力电子实验系统设计与实现.陕西理工学报.2008年6月第24卷第2期
[26]梁金千,张跃.在计算机上产生真随机数的探讨[J].计算机工程.2003, 29(15): 176-177.
[27]王丽君,赵修良.核电子学用随机脉冲信号发生器的方案设计.山西电子技术.2007年第2期
[28]滕建辅,梁静毅,滕颖.对数正态分布伪随机数的产生与检验.天津商学院学报.第27卷第6期2007年11月
[29]俞俊,沈海斌,严晓浪.基于混沌的高速真随机数发生器的设计与实现[J].半导体学报.2004, 25(8): 1013-1018.
[30]彭朝华,吴小光,李广生.放射性活度的符合测量.原子能科学技术.第35卷第3期2001年5月
[31] E. Garcia-solsona , J. Garcia-Orellana , P. Masque, H. Dulaiova . Uncertainties associated with 223Ra and 224Ra measurements in water via a Delayed Coincidence Counter(RaDeCC). Marine Chemistry 109 (2008) 198 -219
[32] B.L.Dickson. R.L.Meakins.C.J.Bland.刘珊珊.利用地下水中镭同位素对放射性异常的评价.世界核地质科学.1985-02-012
[33]张燮.天然水中铀钍镭同位素比值的测定.东华理工学院学报.1981-01-009
[34] Amer C. Hamdan, Juberty A. de Souza, Orlando F. A. Bueno .PERFORMANCE OF UNIVERSITYSTUDENTS ON RANDOM NUMBER GENERATION AT DIFFERENT RATES TO EVALUATE EXECUTIVE FUNCTIONS .Arq Neuropsiquiatr ;62 (1):58-60,2004
[35] Heikki Hurskainen,Elena Simona Lohan, Xuan Hu,Jussi Raasakka, and Jari Nurmi .Multiple Gate Delay Tracking Structures for GNSS Signals and Their Evaluation with Simulink, SystemC, and VHDL .International Journal of Navigation and Observation .Volume 2008, Article ID 785695, 17 pages