最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 6, (1998)
        摘要：The single-electron-loss cross sections for 6- 30keV B+, C+, N+ and O+impacting on H2 have been measured, for the first time, using the growth-rate method. The cross sections of B+ and C+ as functions of ion energy in the region of 6 - 30keV from the present measurements can join smoothly to those in the 100-2500keV region from previous measurements. The variations of the cross sections of B+ , C+, N+ and O+ with the center-of mass energy and nuclear charge of the incident ions are well understood by the molecular-orbital theory.  
        关键词：Electron-loss cross sections;Low-energy ions;H2;Growth-rate method   
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        发布时间：2021-04-09
      • Issue 6, (1998)
        摘要：The absorption properties of Cu:CaF2 films relating to Cu cluster structure have been presented in this paper. It is shown that the resonance frequency depends on cluster size obviously. As cluster size decreases, the absorption peak shows a red shift and the peak-width becomes greater. And a third-order nonlinear-optical susceptibility of about 10-10esu is observed near the absorption peak.  
        关键词：Embedded cluster;Crystalline structure;Optical properties   
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        发布时间：2021-04-09
      • Issue 6, (1998)
        摘要：The growth of metallic films by the pulsed laser deposition （PLD） technique is studied with a new molecular dynamics model. By taking Cu on Cu（100） surface as an example, the simulations show that the high momentary deposition rate and energetic particle impact in the PLD process can promote surface atomic mobility and lead to layer-by-layer growth of films at lower substrate temperatures.  
        关键词：Molecular dynamics simulations;Pulsed laser deposition;Surface atomic mobility   
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        发布时间：2021-04-09
      • Issue 6, (1998)
        摘要：The structural change of the Y type zeolite was studied before and after dealumination by the positron annihilation technique. Four lifetime components were obtained in the NaY zeolite, while five lifetime components appeared in the USY zeoIite after dealumination. The positron lifetimes of the USY zeolite under different air pressures were measured and it was found that the longest-lived component T5 and its intensity I5 decreased strongly with the increase of air pressure. The result showed that secondary pores were formed in the USY zeolite after ion exchange and high- temperature hydrothermal treatment.  
        关键词：Positron lifetime spectra;USY zeolite;Secondary pores;Quenching   
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        发布时间：2021-04-09
      • Issue 6, (1998)
        摘要：The characteristics of polyethyleneterephthalate （PETP） solid state nuclear track detector on registering fission fragment tracks are studied. The variations of average diameter of fission fragment tracks with etching temperature, etching time and etchant concentration were measured. It is shown that among the three factors the influence of etching temperature on fission fragment tracks is the greatest. The PETP detectors were irradiated with low energy 16O heavy ions and the calibration curve was obtained.  
        关键词：Polyethyleneterephthalate（PETP）;Solid state nuclear track detector;Track etching;Heavy ion irradiation   
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        发布时间：2021-04-09
      • Issue 6, (1998)
        摘要：The determination of contents of more than 10 trace elements in scalp hair collected from the juveniles living in the endemic arsenism area of Huhhot, Inner Mongolia （disease area group） ih 1994-1995 by means of instrumental neutron activation analysis （INAA） has been reported. A compariaon of the data from the disease area group with those from the control group, i.e. the juveniles living in Beijing area, has also been made. It ia found that besides the significantly higher hair arsenic content for the disease group than that for the conttol, there are significant differences in contents of some other elements, especially iron and the rare-earth elements such as La ahd Sm. The diffetence in hair elemental eontents between the two groups reflects the difference in environmental and nutritional status of the two areas.  
        关键词：Endemic arsenism;Human hair;Trace elements;INAA   
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        发布时间：2021-04-09
      • Issue 6, (1998)
        摘要：The radii of 48 rabbits were fractured by operation and contents of many elements in bone during fracture healing were determined by PIXE. Irregular changes of the contents of 10 trace elements were observed, whereas regular changes of trace elements Sr and Fe in bone were found with a concave shape and convex one respectively, during the fracttire healing period, suggesting that the contents of trace elements Fe and Sr in bone could be considered as an indicator of fracture healing. Although our results do not support the therapy of fracture by administering element Ca according to the Western medicine, the present work is in favor of the treatment of fracture healing by taking some traditional Chinese medicines which contain many kinds of trace elements.  
        关键词：PIXE;Fracture healing;Trace elements   
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        发布时间：2021-04-09
      • Issue 6, (1998)
        摘要：The carbon nitride crystalline thin film formed by N+ implantation into the carbon film deposited on the Si（100） substrate is reported. The hoplanted film was characterized by Rutherford backscattering spectrometry （RBS） and X-ray diffraction （XRD）. The RBS result shows the film containing about 70% of C and 30% of N. The XRD spectrum indicates the existence of C-N crystalline phase in the film.  
        关键词：Ion beam implantation;Carbon nitride β-C3N4;Polycrystal   
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        发布时间：2021-04-09
      • WANG Shicheng
        Issue 6, (1998)
        摘要：A fission track study has been conducted on the miarolitic garnet from Zhangzhou Igneous Complex. It is found that the garnet is of Mn-and Fe-rich type;its uranium concentration ranges from 0.2 to 0.8μg／g in different grains with an average of 0.7 μg/g; the fission track age of the garnet is 73.4± 2.1Ma; and the induced fission track length and the spontaneous fission track length are 11.5±0.7 μm and 11.0 ±0.8 μm, respectively.  
        关键词：Garnet;Fission track;Evolution of rock unit   
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        发布时间：2021-04-09
      • Issue 6, (1998)
        摘要：The extraction of U（Ⅵ） from nitric acid with N, N-diethyloctadecanamide （DEODA） in toluene has been studied. The effects of concentration of both aqueous phase nitric acid and DEODA as well as temperature on extraction distribution have been considered. The structure of the extracted species has also been confirmed by the FT-IR spectra. Extraction constant Kex at low nitric acid concentration and the thermodynaxnic constants of the extraction reaction are obtained. There is no third phase formation under the experimental conditions, which shows that DEODA is one of promising extractants in nuclear fuel reprocessing.  
          
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        发布时间：2021-04-09
      • Issue 6, (1998)
        摘要：A special nuclear experimental equipment including He-jet system, tape transport system（TTS） and data acquisition system is described. The He-jet and TTS are of ten used to collect and transport reaction products to the front of detectors. Meanwhile the TTS gives a synchronizing signal to control the data acquisition system, which then produces an obvious symbol to mark different sample and to decide how to set time signal. The system is very suitable for the experimental study of short lifetime nuclides far from the stable line.  
        关键词：Data acquisition system;He-jet system;Tape transport system   
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        发布时间：2021-04-09
      • Issue 6, (1998)
        摘要：The high-frequency parameters of HLS were measured and the disadvantages of the originally accepted work mode with large tune-out angles for the highfrequency system were analyzed. Then a reasonable mode with opthoum tune-out angle and higher cavity voltage was proposed and tested successfully.  
        关键词：High-frequency parameters;Tune-out angle;Work mode   
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        发布时间：2021-04-09
      • Issue 6, (1998)
        摘要：The radiological assessment of building material deposits is introduced, including its principle, working procedure and importance. Twenty one deposits of natural stone were assessed with radiomettic methods such as gamma energy spectrum and dose measurements and ganuna logging in the field, nuclide analysis of specimens in the laboratory, etc. As an application example, the assessment of a red-granite deposit located at Cenxi County of Guangxi is described in detail.  
        关键词：Building material deposits;Radiological assessment   
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        发布时间：2021-04-09
      • Issue 6, (1998)
        摘要：Main problems in recent nuclear energy development are pointed out. Present status of the nuclear energy systems driven by high intensity proton accelerator （RCNPS） and research projects on RCNPS in some countries including China are reviewed. Application of the thoritun-uranium fuel cycle in RCNPS is also evaluated.  
        关键词：Accelerator;Reactor;Nuclear energy;Thorium   
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        发布时间：2021-04-09
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