最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 9, (1995)
        摘要：A coincident elastic recoil detection method for oxygen Profiling in silicon isdescribed. By using 12C as the incident particles, 12C and 16O from the same collision event are detected respectively in coincidence. From the obtained 16O energy spectrum, oxygen profile in the sample can be calculated. 27MeV 12C5+ particles are used and oxygen profile in 5.6μm silicon is measured.The results show that this method has a detection limit of about 20×10-6 （atomic）and a depth resolution of about 450nm in 5.6μm silicon. It is specially useful for profiling light elements in samples of about several microns.  
        关键词：Coincidence;ERD;Oxygen   
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        发布时间：2021-04-09
      • Issue 9, (1995)
        摘要：A system of measuring calcium and phosphorus in human legs has beendeveloped by the use of partial-body neutron activation analysis and partial-body counting technique.The results are compared for the normals and osteoporotic patients.  
        关键词：Non-invasive measurment;Ca;P;NAA   
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        发布时间：2021-04-09
      • Issue 9, (1995)
        摘要：Amount of 18F from the photonuclear reaction 19F（γ,n）18F has been measured.When fluorocarbon is used as target, part of the 18F activity can be extracted bywater.The aqueous extraction yield ranges from 9% to 68% depending on the type offluorocarbon used. Because of radiation decomposition of the target compound, the obtained specific activities of 18F is low for nuclear medical use, but enough for some biological studies.  
        关键词：Photonuclear reaction;Fluorocarbons;￣（18）F   
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        发布时间：2021-04-09
      • Issue 9, (1995)
        摘要：Proton-induced X-ray emission （PIXE） technique was used to measure concentration of trace elements in marine rain water over the western Pacific Ocean.The calculation of enrichment factors of various elements indicated that crustal and pollutant elements came mainly from long distance transportation of soil-dust particles and anthropogenic pollutant, respectively.  
        关键词：PIXE;Rain water;Trace elements;Enrichment facfors   
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        发布时间：2021-04-09
      • Issue 9, (1995)
        摘要：In the paper described were the working principle, structure characteristics, main technical specifications and operating results of a high-performance stabilized current power supply. Its application prospects were also given.  
        关键词：Stabilized current power supply;Stability;Shunt   
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        发布时间：2021-04-09
      • Zhang Qinzheng
        Issue 9, (1995)
        摘要：Pot expriments were conducted to investigate the effect of application method of urea and placement of phosphates on uptake and utilization of N and P from fertilizer by rape. 15N-urea was applied at bolting and flowering stages by surface broadcast （B）, 1% solution （J） and surface broadcast followed by watering （BJ）. Recoveries of applied N from mature plants were 24.44%, 32.15% and 27.38% respectively, and utilization of urea-N by seeds were 13.11%,21.77% and 15.94% respectively.32P-Ca（H2PO4）2 was applied at seedling stage and the labelled fertilizer was placed in band with 2cm and 4cm depth and hole with 4cm depth, respectively.32P absorbed by plants 83 days after labelling were 7.04%, 8.24% and 6.56% respectively.  
        关键词：Oilseed rape;Fertilizer application;N;P;Uptake   
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        发布时间：2021-04-09
      • Issue 9, (1995)
        摘要：A 20mm2×0.4mm HgI2 detector was made and used as an X-ray detector. Its typical energy resolution at 25°C is 900eV for 5.9keV X rays and 1.825keV for 59.5keV γ rays.  
        关键词：HgI2 detector;Energy resolution   
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        发布时间：2021-04-09
      • Issue 9, (1995)
        摘要：Three knotty problems concerning with trigger system for electron-gun of a 200MeV linac at the NSRL （National Synchrotron Radiation Lab.） have been resolved. The techniques of producing us power pulse, resisting interference and high voltage isolation are described.Waveforms of the beam current pulse emitted from the electron-gun with both ns and μs modes are shown.  
        关键词：Linac;Electron-gun;Trigger system   
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        发布时间：2021-04-09
      • Issue 9, (1995)
        摘要：A preliminary investigation of lattice damage,secondary defect formation and annealing effects has been carried out for high energy multiple P ion implantation and high and low energy dual implantation in Si.  
        关键词：High energy ion implantation;Lattice damage;Secondary defects;Channeling analysis   
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        发布时间：2021-04-09
      • Issue 9, (1995)
        摘要：A method of nuclear emission time scale based on analysing kinematics of sequential decay fragments has been established. Directions of eastted trajectories are varied with Coulomb interaction between fragments. The shapes of the relative angle correlation functions symmetric ternary fission for example, are changed with take difference τof emission, where τis a free parameter ranging from 0 to 2000fm/c. It is shown that the time scale reduces, with the increase of excitation energy for Ar+Au reactions, from ～1000fm/c at 25MeV/u to 50-100fm/c at 60MeV/u,and the mode of decay evolves from sequential to prompt.  
        关键词：Correlation function;Cascade decay;Nuclear time scale;Symmetric ternary fission   
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        发布时间：2021-04-09
      • Peng Yuqing
        Issue 9, (1995)
        摘要：The experimental results of X ray diffraction and Doppler broadening of positron annihilation radiation for nanocrystalline material Fe2O3 are presented. It is shown that when samples are annealed at 400°C for 4h and 800°C for 4h, the initial γ -Fe2O3 transforms into the α-Fe2O3, and grain diameters increase to 38.7nm and 92.9nm respectively. The line parameters of the specimen decrease with the annealing temperature. When D～L+, the fraction of free positron annihilation increases obviously. The defect concentration increases slightly for samples compacted with a higher pressure.  
        关键词：Nanocrystalline material Fe2O3;Grain diameter;Interface defect;Positron annihilation;X ray diffraction   
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        发布时间：2021-04-09
      • Issue 9, (1995)
        摘要：Under room temperature the electron spin resonance （ESR） spectrometer was used to study the free radical formation in antibiotic-producers （e.g. Streptomyces ribosidificus, Streptothyces kanamyceticus and the phage-resistant culture of Streptomyces kanamyceticus） in order to investigate antibiotic-producer mutagenesis breeding induced by N ion implantation.The results show that a great number of free radicals can be induced by N ion implantation and the yields increase with implanting dose. The death rate of antibiotic-producers also rises due to the increase of the free radical yields.  
        关键词：Ion beam;Strain;Antibiotic-producer;ESR;Free radical   
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        发布时间：2021-04-09
      • Issue 9, (1995)
        摘要：The growth of HgI2 single crystals and the fabrication of HgI2 detectors were introduced. The energy resolution of HgI2 detectors was discussed.A resolution （FWHM）of 1.3keV for 5.gkeV 55Fe X rays and 3.4keV for 59.skeV 241Am γ rays at room temperature was obtained.  
        关键词：HgI2 single crystal;Semiconductor detector;Energy resolution   
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        发布时间：2021-04-09
      • Issue 9, (1995)
        摘要：The properties of the SPIG （Sextupole lon Guide） have been computationally simulated by use of Monte Carlo techniques. The trajectory of each individual ion is traced step by step until it either escapes from the SPIC or reaches the end. The effects of RF electric field and helium flow field on the ions are calculated separately.Tile former is determined by solving the differential equations with the Runge-Kutta method and the latter is known by considering collisions between the ions and gas molecules by use of the RS model or MSW model. A comparison of the two models has been made.The simulation results show that the transmitted efficiency of the ions throughout the SPIG is higher than 95%, width of the kinetic energy distribution and size of the spatial distribution in the plane perpendicular to the symmetry axis after the SPIG are less than 1.0eV and 1mm respectively, and the ions moving in the SPIG are rapidly cooled. Most of the calculated results agree with the experimental results very well. The physical principle, calculation method and approximation used in the simulation have been discussed.  
        关键词：Monte Carlo simulation;SPIG;IGISOL   
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        发布时间：2021-04-09
      • Shen Haoyuan
        Issue 9, (1995)
        摘要：Two 49mm×49mm×3.5mm Si（Li） detectors were fabricated. The leakage current of detector Si（Li）-E-1 vs bias at different temperatures was shown. The energy resolution （FWHM） of detectors E-1 and E-2 for 238Pu 5.499MeV α-particles were ～54.47keV （18°C） and ～57.09keV （20°C） respectively.  
        关键词：Large area Si（Li） detectors;Energy resolution   
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        发布时间：2021-04-09
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