最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 9, (1994)
        摘要：A data acquisition and processing system for PIXE experiments has been established based on a personal computer. Analyses of the thin film standard samples and some gasoloid samples were carried out with the PIXE equipment.  
        关键词：IBM personal computer;PIXE experiment;Elemental composition analyses   
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        发布时间：2021-04-09
      • Issue 9, (1994)
        摘要：The ZrO2 ·Y2O3-NiCoCrAlY thermal barrier coatings（TBC） deposited with the combined ion-electron-atom beams technique were oxidized at 1100℃ for 70h. The SEM-EDAX and XPS micro-analyses were carried out for these specimens before and after the oxidation in order to study the elemental distribution of the coatings and the chemical states of these elements. Some related phenomena were discussed.  
        关键词：Thermal barrier coatings;Elemental distribution   
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        发布时间：2021-04-09
      • Lai Wanchang
        Issue 9, (1994)
        摘要：A method is described in detail for direct determination of MnO, ZnO and Fe2O3contents in manganese-zinc ferrites by EDXRF analysis. The average absolute deviations are 0.14% for MnO（ranging from 14.0% to 21.8%）,0.10% for ZnO（6.60% to 15.9%） and 0.17% for Fe2O3（69.2% to 71.6%） respectively by using a detecting system including a 238Pu source（1.11GBq） and a proportional counter.  
        关键词：Ferrite;X-ray fluorescence analysis;Radioisotope source;Filter   
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        发布时间：2021-04-09
      • Wang Houwen
        Issue 9, (1994)
        摘要：slalom magnetic deflection system composed of three dipoles is described.According to the requirement of medical electron linear accelerators, a computer aided design method is used to determine parameters of the system automatically.The system has good achromatic and focusing properties as well as smaller dimension in vertical direction than other bending systems, so it is particularly suitable for the medical electron linac.  
        关键词：Medical electron linac;Slalom magnetic deflection system;Achromaticity   
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        发布时间：2021-04-09
      • Issue 9, (1994)
        摘要：A variety of moderator structures composed of natural uranium and polyethylene were calculated,showing that the best arrangement is to wrap the 14 MeV neutron source with a layer of 2-2.5cm natural uranium and to use thermal neutrons at a distance of 2-3cm from the surface of uranium. When the enriched uranium is used as the intensifying material,only at a certain distance from the source can it have better effect than natural uranium. The subcritical multiplying systems composed of polyethylene and fuel （polyethylene mixed with enriched uranium） with the same dimension as mentioned above were also calculated. Natural uranium and lead were found to still have significant enhancement for 14 MeV neutron source in the systems. In a subcritical system with proper structure, the intensifying factor M can be close to or even greater than （1-k）-1 where k is effective multiplication constant of the system.  
        关键词：MeV neutron source;Moderator structure;Intensifying material;Effective multiplication constant   
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        发布时间：2021-04-09
      • Lu Jianqin
        Issue 9, (1994)
        摘要：A computer program LEADS, written in about 6600 statements of MS FORTRAN 5.1 language, is suitable to run in IBM PC and other compatible computers. Program LEADS can make simulation for beam optical systems consisting of three-tube einzel lenses, three-aperture einzel lenses, two-tube lenses, uniform field DC accelerating tubes,magnetic and electrostatic quadrupoles, bending magnets,single-gap rf resonators, two-gap rf resonators （QWR） and three-gap rf resonators （SLR）.Multi-particle tracking and matrix multiplication are used to calculate the beam transport. Monte Carlo techniques are adopted to generate randomly the initial particle coordinates in the phase spaces, and Powell nonlinear optimization routines are incorporated in the codes to search the given optical conditions. The calculated results, can be displayed graphically on the computer monitors.  
        关键词：Monto Carlo method;Nonlinear optimization method;Phase space;Beam envelope   
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        发布时间：2021-04-09
      • Issue 9, (1994)
        摘要：A computer based measurement system for the study of radiation effects on MOS structures, such as MOS capacitors, MOSFETs, semiconductor devices and integrated circuits was introduced in this paper. The system’s function was described and some application examples were given.  
        关键词：Semiconductor devices;Integrated circuits;Radiation effect;Computer based measurement system   
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        发布时间：2021-04-09
      • Issue 9, (1994)
        摘要：In this paper introduced was a kind of one-dimensional position-sensitive detector using resistive anode for readout. Its principle, structure and the follow-up data acquisition system were briefly described. The various properties and parameters of the detector were also measured.  
        关键词：Position sensitive detector;Microchannel plates;Position resolution   
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        发布时间：2021-04-09
      • Issue 9, (1994)
        摘要：The CATEF program for the calculation of potential distribution in accelerating tubes is presented. It includes the finite difference method-superrelaxation technique for calculating potential distribution and the Rouge-Kouta method for particle trajectories. The CATEF can also be used in electric field design of other electron optical parts. The three dimensional CATEF is suitable for the calculation and design of complex electric field.  
        关键词：Accelerating tubes;Potential distribution;Particle trajectory   
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        <引用本文> <批量引用> 8407916 false
        发布时间：2021-04-09
      • Issue 9, (1994)
        摘要：n the paper introduced was a technique of making solid phase samples, i.e.counting scintillation pardon sheet melted on a filter film containing samples. Its efficiency for 3H was 3% to 10% depending on different filter films. Consistent results were obtained with different apparatlls. And good accuracy and reproducibility of counting results were reached.  
        关键词：Liquid scintillation counting;Scintillation liquid;Solid phase scintillator   
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        发布时间：2021-04-09
      • Issue 9, (1994)
        摘要：The effects of 6oCo γ-ray on the linearity and output characteristics of MOSFETs were investigated. The relations of oxide-trapped charge and Si/SiO2 interface state density to the decrease of mobility p and transconductance gm, and the shift of the output curves for both P-MOSFETs and N-MOSFETs were qualitatively described. It was shown that degradation of analog characteristics, for P-MOSFETs, resulted from both oxide-trapped charge and interface state, but the degradation for N-MOSFETs was mainly due to the increase of radiation induced Si/SiO2 interface state density.  
        关键词：Ionizing radiation effect;MOSFET;Analog characteristics   
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        发布时间：2021-04-09
      • Wang Qizu
        Issue 9, (1994)
        摘要：The progress in the studies on irradiation damage and modification in mechanical and friction properties of ceramics induced by ion Anplantation as well as enhanced adhesion between a thin metal film and a ceramic substrate by ion beam mixing is reviewed.  
        关键词：Ion implantation;Ion beam mixing;Ceramic;Surface modification;Enhanced adhesion   
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        发布时间：2021-04-09
      • Issue 9, (1994)
        摘要：A new principle is outlined for generating electrical power by ultilizing decay energy of the waste radioisotopes. The electromagnetic radiation emitted by βparticles in a magnetic field can be used in the energy conversion process. If this principle is combined with the beta voltaic effect, the theoretical energy conversion efficiency limit would be 62% for using 90Sr-90Y β source. The practical efficiency would be on the order of 27%. The preliminary experimental results showed that the efficiency of the beta voltaic process might be more than 14.2%.  
        关键词：Radioisotope;β decay energy;Electromagnetic radiation;Beta voltaic effect;Electrical power generation   
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        发布时间：2021-04-09
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