最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 3, (1995)
        摘要：The structure changes after annealing for the Fe ion implanted layer of polycrystalline sapphire have been studied by X-ray diffraction combined with the POWD12 program.  
        关键词：Ion implantation;Sapphire;X-ray diffraction   
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        发布时间：2021-04-09
      • Issue 3, (1995)
        摘要：In this paper discribed is the design of a large area scintillation counter used in a cosmic ray observation array.Construction of the light-guide box,selection of the reflection material, calibration method,and determination of the operation voltage for the counter are presented.  
        关键词：Cosmic ray;Observation array;Scintillation counter   
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        发布时间：2021-04-09
      • Issue 3, (1995)
        摘要：The dependence of electron backscattering coefficient upon incident electron energy, material thickness and energy loss was reviewed. Effect of electron backscattering coefficient on electron processing was also described. Based on multi-pened.ation and multi-backscattering of incident electrons in multilayer materials, a program ED410 has been proposed for calculating the depth distribution of electron energy deposition and the dose factor in different substracte materials for different incident energy. By using a substrate and its backscattering effect,irradiation uniformity in electron processing can be improved greatly.  
        关键词：Electron;Backscattering;Multilayer materials   
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        发布时间：2021-04-09
      • Issue 3, (1995)
        摘要：Two surface deformation modes,i.e.blistering and flaking behaviour of amorphous alloys Fe77B16Si5Cr2, Ni78B14Si8,etc.under helium ions bombardment have been investigated by scanning election microscope.The results show a dependence of the surface erosion mode on dose rate.Thickness of blistering is equal to the mean projected range,while that of nabing is less than the range. The gas driven model and the lateral stress driven model were used to explain the mechanism of blistering and flaking,respectively.  
        关键词：Amorphous alloy;Irradiation;Blistering;Flaking   
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        <引用本文> <批量引用> 8410721 false
        发布时间：2021-04-09
      • Issue 3, (1995)
        摘要：The dependence of surface damage of amorphous alloys Co60Fe12Ni10Si6B12 and Fe39Ni39V2Si12B8 irradiated with 195keV argon ions on the ion dose has been investigated by using scanning electron microscope.Surface damages such as blistering and sputtering were observed.At low dose blistering was dominant, but at higher dose blisters disappered and a porous structure was developed as the result of sputtering.The reasons for disappering of blisters at high dose were also discussed in detail.  
        关键词：Argon ions;Irradiation;Amorphous alloy;Surface blistering;Sputtering;Porous structure   
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        发布时间：2021-04-09
      • Wang Jinyu
        Issue 3, (1995)
        摘要：Eighteen pigment samples of lapis lazuli from the frescoes of ten dynasties at the Mogao Grottoes, Main Mountain Grottoes and Bingling Temple Grottoes of Dunhuang were analyzed qualitatively and quantitatively by PIXE. The trace elements of Mn,Cr,As,Ti,Sr, Zn etc. contained in the pigment were discussed and the results were compared with those of XRF,XRD and Electron probe analysis.  
        关键词：Proton induced X-ray emission;Mogao Grottoes of Dunhuang;Ancient frescoes;Pigment;Lapis lazuli;Trace elements   
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        发布时间：2021-04-09
      • Issue 3, (1995)
        摘要：A ΔE-E telescope detector composing of a BGO crystal and a penetrated Si（Au）detector has been used to identify the charged particles in heavy ion experiments.The results indicated that this detector was of higher ability for particle identification.  
          
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        <引用本文> <批量引用> 8410757 false
        发布时间：2021-04-09
      • Issue 3, (1995)
        摘要：The ESR dating of stalagmite samples from Choukoutien Cave is described. The close-equilibrium model was used to estimate the ESR age which was then compared with the U series age.The two average ages were found consistent,indicating the reliability of the ESR dating.  
        关键词：Stalagmite;Accumulative dose;Annual dose;ESR dating   
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        <引用本文> <批量引用> 8410793 false
        发布时间：2021-04-09
      • Issue 3, (1995)
        摘要：ased on the combination of the point-charge-model and the concept of effective bond valence,a new theory of point-charge-effective-valenc was developed.On the basis of this model,the variations of electric field gradient and quadrupole splitting on different Fe sites with the displacement of Fe dopant in Fe-doped Y-124 oxide superconductor are studied.According to quadrupole splittings obtained by Mossbauer spectroscopy, it can be deduced that the displacement of Fe3+ ions from the Cu-O2 plane are 0.0195nm for Fe-O five coordination and 0.0395nm for Fe-O six coordination,respectively.  
        关键词：Point-charge-effective-valence-model;Y-124 oxide superconductor;Electric field gradient;Mossbauer spectroscopy   
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        <引用本文> <批量引用> 8410818 false
        发布时间：2021-04-09
      • Issue 3, (1995)
        摘要：The diffusive behavior of B atoms in Ni3Al（0.98at%B） alloy has been investigated by positron annihilation technique after the alloy was homogenized at high temperature and followed by quenching in water, cooling in air and cooling in furnace respectively. It was shown that the amount of B atoms segregating to grain boundaries for the alloy cooled in furnace was the most,whereas the least for that quenched in water,and that a little of boride was formed at the grain boundaries in the former case.In order to make the alloy with moderate segregation of B atoms to grain boundaries and without boride formed there,the alloy was recommended to be cooled in air after being homogenized at high temperature.  
        关键词：Boron atoms;Ni3Al;Positron annihilation   
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        发布时间：2021-04-09
      • Issue 3, (1995)
        摘要：The 89Sr was added to the teatree-soil system by different ways. The 89Sr in to the system through the over-ground part of teatree,was much more than that through soil. The 89Sr concentration in older leaves was higher than in shoot for a definite treatment. The accumulation elimination law of 89Sr in leaves varied with the treatments. For the treatment througn the over-ground part,the 89Sr concentration in older leaves and shoot was monotonously decreased with time increasing. But for the treatment through soil the 89Sr concentration in shoot was increased to reach a peak value, and then decreased slowly; while the 89Sr concentration in older leaves increased quickly in a period, then increased slowly to attain a saturated value.In addition, the concentration factor of 89Sr in older leaves and shoot were determined.  
        关键词：?89)Sr;Teatree leaves;Radioecology;Concentration factor   
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        <引用本文> <批量引用> 8410843 false
        发布时间：2021-04-09
      • Issue 3, (1995)
        摘要：The cross-sections for 152Sm（n, γ ）153Sm reaction in the neutron energy range of 22- 1019keV are obtained from the neutron capture cross-section data for 197Au by the activation method, with an error of less than 6.8%.  
        关键词：Activation method;Neutron capture cross-section;￣（152）Sm   
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        <引用本文> <批量引用> 8410856 false
        发布时间：2021-04-09
      • Issue 3, (1995)
        摘要：The possibility of using middle size grains（10-30 μm） in thermoluminescence（TL） dating of pottery is discussed.Data from fifteen specimens show that there is good agreement in the estimated equivalent doses from the middle grain fraction and the fine grain （2-8 μm） fraction of the same specimen.The natural TL intensity of the middle grain fraction was found to be higher than that of the fine grain fraction for the same sample.  
        关键词：Pottery dating;Middle grain technique   
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        <引用本文> <批量引用> 8410867 false
        发布时间：2021-04-09
      • Issue 3, (1995)
        摘要：The basic features of the focal plane detector system for light particles with Beijing Q3D magnetic spectrometer have been tested by the products from 197An, 12C,56Fe, C3H6N6（p,p） and （α, α ） reactions at HI-13 Tandem. Measured intrinsic position resolution is 1.36±0.07mm and the integral nonlinearity for position is 7.5 ×10-3. The identification of light particles by the ΔE-E telescope is satisfactory.  
        关键词：Position resolution;Focal plane detector system   
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        发布时间：2021-04-09
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