239Pu alpha spectrum analysis based on PIPS detector response function and variations with vacuum and distance

作     者：Rui Shi Xian-Guo Tuo Huai-Liang Li Jian-Bo Yang Yi Cheng Hong-Long Zheng 

作者机构：Provincial Key Lab of Applied Nuclear Techniques in Geosciences Chengdu University of TechnologyChengdu 610059 China Sichuan University of Science and EngineeringZigong 643000 China Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory Southwest University of Science and Technology Mianyang 621010 China 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2017年第28卷第1期

页      面：20-26页

核心收录：

学科分类：082704[工学-辐射防护及环境保护] 08[工学] 0827[工学-核科学与技术] 

基　　金：supported by the National Natural Science Foundation of China(Nos.41374130 and 41604154) Opening Foundation of Sichuan Provincial Key Lab of Applied Nuclear Techniques in Geosciences(No.gnzds2014003) the Open Fund of Robot Technology Used for Special Environment Key Laboratory of Sichuan Province(13zxtk04) 

主　　题：Alpha spectrum Detector response function Weighted least squares PIPS detector 

摘      要：Effect factors of the absorption of the source,air,entrance window,and dead layer of a detector must be considered in the measurement of monoenergetic alpha particles,along with statistical noise and other factors that collectively cause the alpha spectrum to exhibit a well-known low-energy ***,the estabUshment of an alpha spectrum detector response function from the perspective of a signaling system must consider the various factors mentioned *** detector response function is the convolution of an alphaparticle pulse function,two exponential functions,and a Gaussian function,followed by calculation of the parameters of the detector response function using the weighted leastsquares fitting method as proposed in this *** our experiment,^(239)Pu alpha spectra were measured by a highresolution,passivated implanted planar silicon(PIPS)detector at 10 levels of vacuum and 10 source-detector *** spectrum-fitting results were excellent as evaluated by reduced Chi-square(x^2) and correlation ***,the variation of parameters with vacuum level and source-detector distance was *** demonstrate that σ,τ_1,and τ_2 exhibit no obvious trend of variation with vacuum in the range 2000-20,000 mTorr,and at a confidence level of 95%,the values of τ_1 and τ_2 decline in a similar fashion with source-detector distance by the power exponential function,while the value of a declines linearly.