最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 2, (1994)
        摘要：In the production of ultrathin polypropylene film with heating and streching method the problems of film breaking and sticking have to be resolved.In this paper the physical process in thin film making is discussed in detail and the reason of film breaking is given.By using a new type of altuminum disk with a set of leak holes in cone shape and a spray-coated Teflon on its surface,the ultrathin polypropylene film has been produced easily with a quasi-static streching pressure from high pressure nitrogen gas source and without a thin Teflon film covered on the disk surface for preventing sticking.  
        关键词：Gas detectors;Polypropylene;Ultrathin films;Electrodes   
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        发布时间：2021-04-09
      • Meng Xiangti
        Issue 2, (1994)
        摘要：The annealing behaviour of defects in FZ silicon grown in argon atmosphere and irradiated with neutrons has been studied by positron annihilation lifetime and Doppler broadening measurements.For FZ silicon irradiated with different neutrondoses,the radiation-induced monovacancy-type defect has very similar annealing behaviour and can be annealed out at 550℃,but the concentration of radiationinduced divacancy and the production,concentration and annealing-out temperature of secondary divacancy-and quadrivacancy-type defects are very different.The simple trapping model seems not suitable for FZ silicon irradiated with high neutron dose and annealed at the temperature lower than 500℃,but is suitable partially for that irradiated with middle neutron dose.  
        关键词：Neutron irradiation;NTD Si;Point defects;Positron annihilation   
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        发布时间：2021-04-09
      • Issue 2, (1994)
        摘要：The instrumentation and control system for a 60MeV LINAC,as a preinjector for 2 GeV LINAC of the PLS project,have been designed under the institutional collaboration between the IHEP（Beijing,China） and POSTECH（Pohang,Korea）.The I/C system is being set up at the POSTECH of Pohang.This paper describes its major characteristics and present status.  
        关键词：Distributed control;Beam diagnois;Modulator;Magnet;Interlock   
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        <引用本文> <批量引用> 8534888 false
        发布时间：2021-04-09
      • Gao Jianxia
        Issue 2, (1994)
        摘要：The damage and annealing behavior of single-crystal Si（100） samples implanted with 480 keV P+ ions with a dose of 1×1016cm-2 have been studied.Samples were analysed with RBS/channeling and cross-sectional TEM techniques.The result indicates that there is a low density defects band at the depth of 240 nm after annealing at 600℃ for 30min.This phenomenon is related to P+ dose and annealing temperature.  
        关键词：Implantation;Annealing;Defect   
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        <引用本文> <批量引用> 8534906 false
        发布时间：2021-04-09
      • Issue 2, (1994)
        摘要：The man-machine interface software（MMISP） is designed to configure the console software of PLS-60MeV LINAC control system.The control system is of distributed type which includes the main computerantel 310),four local stations and two sets of industrial level console computers.The MMISP provides the operator with the display page editor,various I/O configuration such as digital signal In/Out,analog signal In/Out,waveform TV graphic display, and interaction with operator through graphic picture display, voice eXplanation and touch panel.  
        关键词：Man-machine interface;Touch panel;Page editor;Speech library;Encoder   
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        <引用本文> <批量引用> 8534920 false
        发布时间：2021-04-09
      • Issue 2, (1994)
        摘要：The detection system composed of an 80cm large area position sensitive ionization chamber and two one-dimensional position sensitive plastic scintillators is used in the intermediate energy heavy ion reactions for the first time.The ionization chamber itself can be used to measure the heavier low energy ions with good particle identification ability and can provide information about energy as well as X and Y coordinates.The scintillators provide the possibility of measuring higher energy particles and can give energy and one dimensional position signals.Combined with the ionization chamber they can be used for particle identification.  
        关键词：Position resolution;Particle identification;Position sensitive   
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        <引用本文> <批量引用> 8534930 false
        发布时间：2021-04-09
      • Issue 2, (1994)
        摘要：The distribution homogeneity of 13 elements（As,Ce,Co,Cr,Cs, Eu,Fe,Hf,La,Rb,Sc,Sin and Th） in the esturine sediment SRM 1646 as evaluated by INAA in the range of sampling amounts from 50μg to 20mg.The sampling constants of these elements were also calculated.Our experimental results reveal that the homogeneity of the studied elements is related to their speciation and sampling amount.  
        关键词：Homogeneity;Trace elements;Standard reference material;INAA   
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        <引用本文> <批量引用> 8534947 false
        发布时间：2021-04-09
      • Wang Peilu
        Issue 2, (1994)
        摘要：The effect of Cr or Ta added to metals by ion beam surface metallurgy on their corrosion behavior has been systematically discussed in terms of the alloy components,structure,defects,essential properties of alloy elements and the surface contamination.A synthetic model of the corrosion resistance for these surface alloys has been suggested.A better corrosion resistance mechanism is proposed.  
        关键词：Ion beam metallurgy;Ion implantation;Ion beam mixing;Corrosion   
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        <引用本文> <批量引用> 8534958 false
        发布时间：2021-04-09
      • Yan Pengxun
        Issue 2, (1994)
        摘要：The TiN thin films are produced on the Ti plated iron samples by N ion beam mixing.The mechanical measurements show that the samples are of high hardness and good wear resistance after N ion beam mixing.The sample with0.5×1017N+/cm2ion beam mixing has a golden appearance and its reflectance curve within the range of visible spectrum resembles that of pure TiN.  
        关键词：Ion beam mixing;TiN thin films;Wear;Reflectance curve   
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        <引用本文> <批量引用> 8534966 false
        发布时间：2021-04-09
      • Issue 2, (1994)
        摘要：The liver,brain,kidney,lung and stomach tissues of about fifty abortive fetuses from Baotou,Beijing,GuangZhou,Kunming and Shanghai at the period of 1985-1986 were analyzed on 12 elements by PIXE method.From the data,a significant difference on some elemental contents between different regions was found.The contents of Ca in five organs for Guangzhou fetuses were significantly lower than those for other regions fetuses（P<0.01）,while the contents of Rb in five organs for Kunming fetuses showed a higher level than those for other regions’fetuses（P<0.01）.A comparison of the Pb data between fetal elemental spectra and aerosol analysis for different regions revealed a positive interrelation,which may suggest that the data of fetal elemental spectra can indicate the environmental change.In comparison between the fetal elemental spectra data and the regulating cancer-death-rate data,a positive relationship for Pb contents and a negative relationship for Rb contents can be found,which may support the theory that Pb seems cancerogenic and Rb anticancerous.  
        关键词：PIXE analysis;Fetal tissues;Pb;Rb   
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        <引用本文> <批量引用> 8534977 false
        发布时间：2021-04-09
      • Issue 2, (1994)
        摘要：The ECR ion source,beam line from ECR to SFC and electrostatic inflector have been designed and installed to increase ion species and beam intensity.The working points are mainly located in the third harmonic accelerating region.The central region was studied carefully,and the Dee and dummy Dee were rebuilt to match the external injection system.Other improvements were adopted to improve the performance and operation efficiency of SFC.The commissioning of the upgraded SFC is also described.  
        关键词：Cyclotron;ECR ion source;Central region   
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        <引用本文> <批量引用> 8534994 false
        发布时间：2021-04-09
      • Issue 2, (1994)
        摘要：ethods for determining the dose distribution around a beta applicator are described.Experimentally a TLD dosimeter（about 10μm in thickness） was used to measure the dose and its distribution in a polystyrene phantom.Theoretically Berger’s method was adopted to calculate the dose distribution.An extrapolation ionization chamber was used to check feasibility of the above methods.It was found that the TLD method was in considerable agreement with the chamber method while the calculation was correct in a distance of 2-5mm to the source with an error of less than ±5%.  
        关键词：Radiotherapy;Radiation dose;TLD;β-applicator   
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        <引用本文> <批量引用> 8535007 false
        发布时间：2021-04-09
      • Issue 2, (1994)
        摘要：Hydrophilic monomer 2-hydroxyethyl acrylate（HEA） and a series of polyethylene glycol dimethacrylate monomers were copolymerised by radiation technique at low temperature（-78℃） and hydrophilic were obtained.The immobilization of yeast cells with these copolymeried carriers led to a higher ethanol productivity than free cells.Of all copolymer carriers,the ethanol yield with poly（HEA-14G） was the highest,about 2.45 times as high as that of free yeast cells.In addition, the ethanol productivity of 12 batch repeated reactions with poly（HEA-14G） carrier was all higher than that of free yeast cells.The ethanol productivity of immobilized yeast cells was dependent on the proportion of hydrophilic monomer to other monomers in copolymer systems,the chain length of the bifunctional monomer,the degree of hydration of copolymer carriers,the structure of copolymer carriers and porosity in the internal structure of carriers.The ethanol yield of immobilized cells depended on swelling ability and porosity of copolymer carriers.  
        关键词：Radiation copolymerization;Immobilized yeast cells;Hydrophilic hydrogel carriers   
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        发布时间：2021-04-09
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