最新刊期
      卷 0 ， 期 0 ， 2020
      • YU Guoqing SHI Ying OUYANG Zhenqian CHEN Jingshen ZHANG Zhibin ZHU Dezhang PAN Haochang XU Hongjie
        Issue 2, (2001)
        摘要：The surface morphology of organic material (CH3SiO3/2 ) bombarded by energetic cluster beam was investigated by Atomic Force Microscopy (AFM). The results showed that the migration and adhesion of cluster constituent atoms on the surface would be improved if the cluster energy gradually increased, accordingly improving the quality of film. Especially, the existence of convex stripes on the surface indicated the diffusion ability increased with the increasing cluster energy.  
        关键词：Energetic cluster;AFM;Surface migration and adhesion   
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        发布时间：2021-03-12
      • XIAO Gang
        Issue 2, (2001)
        摘要：A nonlinear wavelet analyzing method was designed for smoothing low -- level r -- ray spectra. Compared to multionomial fitting gliding smoothing method and Fourier analyzing method, the present method had the advantages of minimizing the lose of little peaks and reducing the influence of statistical noise.  
        关键词：Nonlinear wavelet analysis;Gamma- ray spectra;Data smoothing   
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        发布时间：2021-03-12
      • CHEN Jun
        Issue 2, (2001)
        摘要：The electronic structure of MgO crystal with F type color center has been studied with the relaxation of ions around vacancy by using the SCC -- DVM -- Xa methods. The energy band, bulk density of states and mulliken efficient charge have been calculated. Also, the optic transition model has been discussed. Our calculation results showed that F, F+ and F2+ -- center in MgO crystal introduced defect energy levels in the forbidden gap. The calculated absorption energies for F and F+- center were 4. 67eV and 4. 66eV, respectively. Also, big photoelectron energies were required for F and F+ --centers. The good agreement with experimental data showed the reasonableness of the calculated results.  
        关键词：MgO cryslal;F;F~+;F2+ center;Electronic level;Optic transition energy   
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        发布时间：2021-03-12
      • HUANG Hongbo WU Dongmin SHI Hairong XIAO Yuming LI Shiming HSIA Yuanfu
        Issue 2, (2001)
        摘要：The stainless steel (F316Ti) used in reactor have been studied with the methods Of Mossbauer spectroscopy, including transmission, conversion electron and conversion X -- ray spectroscopy, and assisted with X -- ray diffraction and Auger electron spectroscopy. The components and microstructure of the passivation layer and corrosion products provided the foundation in studying the microstructure of corrosion about the reactor stainless steel. The result could be confirmed by the macroscopic results with corrosion mechanism. The experiment indicated that the erosion resistance is not only related with the content of carbon, but most importantly with the heat treatment process of solid solution and solid solution condition.  
        关键词：Mossbauer spectroscopy;Nuclear reactor;Austenitic steel   
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        发布时间：2021-03-12
      • BAI Renji ZHAO Jie
        Issue 2, (2001)
        摘要：A structure of InP(InGaAsP)/InP was grown by He Plasma Assisted Molecular Beam Epitaxy (PAMBE). The epitaxy layer passessed high resistivity and very fast light response. The results of positron annihilation spectrum showed that those electric and optical characteristics were linked with the defects and its evolution created by PAMBE.  
        关键词：Low energy positron annihilation;He plasma;Molecular beam epitaxy   
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        发布时间：2021-03-12
      • YANG Weifan YUAN Shuanggui MA Taotao XIONG Bing XU Yanbing LI Zongwei HE Jianjun
        Issue 2, (2001)
        摘要：The experimental conditions for the extraction of thorium by using PMBP as extractant and 234Th as tracer in the nitric acid solution were investigated. Based on the experiments, a chemical procedure used for rapidly separating thorium from the natural uranium irradiated by 18O ions was developed. The r spectrum of the thorium fraction shows that the most of the reaction products, especially U, Ce and I can be completely removed by using the procedure.  
        关键词：Chemical separation;New rich -- neutron nuclide;r spectrum;Decontamination factor   
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        发布时间：2021-03-12
      • ZENG Haining YAN Shikui WANG Zhaomin WANG Yonggang WANG Congrong XU Zizong
        Issue 2, (2001)
        摘要：A. r .camera based on Position Sensitive Photomultiplier Tube (PSPMT) has been set up and tested. The system comprised a PSPMT, a plane NaI(T1) crystal, a parallel collimator and DAQ system. The energy resolution for 57Co (122keV) wad 27%, and the spacial resolution (FWHM.) was ~ 4mm for 2mm diameter aperture. The result showed that this type of gamma camera was superior to the standard anger camera.  
        关键词：Position sensitive photomultiplier tube (PSPMT);Planar crystal;. Scintillation photon;Shrinkage   
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        发布时间：2021-03-12
      • SHI Weiya LU Zuhui XU Aijun ZHAO Weijuan LI Youming
        Issue 2, (2001)
        摘要：Radionuclides in 31 pieces of ground bricks from different sources were determined by using the γ spectrometry. The spectra were resolved by the least square method. The contents of U, Th, Ra and 40K in them spread in a wide range. Values of some bricks products were above the limits of the state standard for radiahazards in building meterials.  
        关键词：Specific radioactivity;Building material;Equivalent concentration   
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        发布时间：2021-03-12
      • A Jingye CHEN Da TU Jing
        Issue 2, (2001)
        摘要：A simulation system based on personal computer in DOS environment has been designed to simulate the γ- ray measurement spectrum. The γ- ray spectra for reactor neutron activation analyses and the spectra of radionuclides can be simulated in this system on the basis of modeling for an experimental spectrum of 137Cs. In the spectrum, the photopeak, Compton edge, Compton plateau and backscattering peak are simulated. This system has functions of peak area calculating, spectrum shaping, spectrum displaying, spectrum processing and spectrum saving, etc. Using this simulation system, the γ- ray spectra of 137Cs, 60Co, 152Eu and the spectra of Zr sample, rock standard sample for reactor neutron activation analyses have been simulated. The simulation spectra are similar to the spectra measured in the actual experiment to a great extent.  
        关键词：Simulation spectrum;NAA;Peak -- to -- Compton ratio;Compton continuum;Photopeak   
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        发布时间：2021-03-12
      • ZHENG Mingguang XU Jijun
        Issue 2, (2001)
        摘要：This paper stated the design objectives of the computerized instrumentation and control system including the main control room, which could be and should be achieved in CNP1000, based on the national 1E computer production technology including software and hardware, and current instrumentation and control design technique of nuclear power plant. The affecting factors on the design objectives and the reasons or necessity to do the design research projects have been described. The objectives of design research on the computerized instrumentation and control, and the compact main control room, as well as the self -- design proficiency after the design research have been completed are given.  
        关键词：CNP1000 nuclear power plant;Instrumentation and control;Digitalized (Computerized);Network technology   
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        发布时间：2021-03-12
      • LI Aiguo NI Xinbo CAI Yingwen ZHANG Guilin
        Issue 2, (2001)
        摘要：The interaction of N2+, N+ ions with α - Fe nanoparticles in copper film has been studied by Mossbauer spectroscopy. The results showed that there was obviously non -- liner effect in N2+ ion implantion. In the present study, the processes of thermodynamics for collision and after collision of N2 + and N + ions with α - Fe nanoparticles have also been investigated.  
        关键词：Ion implantation;Non -- liner effect;Mossbauer spectroscopy   
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        发布时间：2021-03-12
      • WANG Shaling JIANG Rangrong WANG Lei
        Issue 2, (2001)
        摘要：Cs deposited on the Chinese land produces r dose rate. It is fairly reasonable to estimate its contribution by using the uniform distribution model. In this study, the province averages of 137Cs r dose rate were found to be (7-18 ) x 10 -10,Gyh -1, which correspond to 1 % --3% of total r dose rate on land. The average of whole country was about 9 x 10 -10Gyh -1 and 1. 5% of total r dose rate when took the population distribution into consideration. The maximum was 1. 7 x 10 -8Gyh -1 which approached to the contribution from any natural radionuclide series. The results for 137Cs r dose rate estimated by using the exponential distribution model with 3cm average depth were about twice as large as those estimated by using the uniform distribution one.  
        关键词：137Cs;r dose rate;Distribution model   
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        发布时间：2021-03-12
      • ZHU Haixin CHENG Huansheng YANG Fujia
        Issue 2, (2001)
        摘要：The experimental results of the analysis of the jade unearthed from the Fuquan hill by proton induced X -- ray emission (PIXE) are reported. By using PIXE technology, an appraisal of the jades unearthed from Fuquan hill can be made. The experimental results show that the Fuquan hill’s jades can be distinguished into two classes: Xiu jade and soft jade, and they are different to Xiaomeiling s jade but similar to the soft jade from Hetian, Xinjiang province. Furthermore, by analyzing proportion of iron and magnesium, some information of mineral structure and the color exuding of the jade from Fuquan hill can be obtained without any interference from impurity element.  
        关键词：Fuquan hill;LiangZhu culture;PIXE;X -- ray fluorescence   
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        发布时间：2021-03-12
      • ZHANG Lan YIN Duanzhi
        Issue 2, (2001)
        摘要：The significance and restrictions of the synthesis of 6 - [ 18F] fluoro - L - dopa is briefly introduced. The main principles of some representative synthesis routes of eletrophilic and nucleophilic fluorination methods are described. The characteristics of the two methods are also compared.  
          
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        发布时间：2021-03-12
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