最新刊期
      卷 0 ， 期 0 ， 2020
      • Cao Dexin Zhu Dezhang Zhu Fuying Cao Jianqing
        Issue 2, (1997)
        摘要：Solid phase epitaxial regrowth of amorphous silicon formed at 430℃was found if the amorphous silicon layer involved implanted Ni impurity with dose range from 1×10 12 ; to 2.5×10 17 Ni/cm 2. The Rutherford backscattering with channeling was used to determine the thickness of amorphous Si layer after 430℃ annealing. The results indicate that the SPER at 430℃ occurs and its rate depends on Ni implanted dose, and normally, the SPER is faster than that of pure amorphous Si by two orders.  
        关键词：Solid phase epitaxial regrowth;Ni + implantation;Amorphous layer   
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        发布时间：2021-04-09
      • Xie Hongmei Wei Zengquan Li Wenjian
        Issue 2, (1997)
        摘要：The intensity distribution of characteristic X-rays from Fe element at different depths of embryo of a wheat seed implanted vertically by 110keV Fe +ions was measured in SEM along the longitudinal channel section. It was shown that the distribution was of exponential decrease similar to the case of thermal diffusion in crystals.  
        关键词：Wheat;Ion implantation;SEM;X-ray spectrum analysis   
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        发布时间：2021-04-09
      • Shao Chunlin Xu An Yu Zengliang
        Issue 2, (1997)
        摘要：The N + implantation-induced influence upon the surface charges of tyrosine and adenosine molecule crystals was studied with the method of capillary electrophoresis. The swimming directions of the implanted molecule crystals were found to be related to dose of the implanted ions. Irradiated by 30keV N + with a dose of 15×10 19 /m 2, the tyrosine or adenosine crystals had three swimming models: to cathode, to anode, and motionless. This means that the charge exchange effect between N + and the target molecules exists and the transferred charge amount has been estimated.  
        关键词：Ion implantation;Biomolecules;Charge exchange   
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        发布时间：2021-04-09
      • Deng Wen 1,2 Xiong Liangyue 2,3 Wang Shuhe 3 Guo Jianting 3 Long Qiwei 2,3 1
        Issue 2, (1997)
        摘要：The cathodic charging of hydrogen into binary Ni 3Al and Ni 3Al with 0.52at.% B has been investigated by measuring the positron lifetime spectra. It is found that the alloys with hydrogen atoms initially migrated to the pre-existent defects result in the decrease of lifetime of positrons in the defects. With the increase of H-charging time, more hydrogen atoms are accumulated at the defects, subsequently forming the gaseous hydrogen molecules with high pressure to generate larger open-volume defects,thus increasing positrons’ lifetime. Hydrogen effects are weaker in Ni25;337;Al with 0.52at.% B as compared with those in binary Ni25;337;Al alloy, which indicates that the addition of B atoms could suppress hydrogen-harmful effect in Ni 3Al alloys.  
        关键词：Hydrogen;Microdefects;Positron lifetime;Ni 3Al alloys   
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        发布时间：2021-04-09
      • Zhang Yuanxun Gu Yingmei Zhu Jieqing Zhu Xinfang
        Issue 2, (1997)
        摘要：In order to develope new reference materials for microanalytical nuclear techniques, a scanning proton microprobe（SPM） was used to determine homogeneity level within 100μm×200μm micro-areas of the IAEA Urban Dust Reference Materials. The experimental methods are described and the results discussed.  
        关键词：Standard reference materials;Scanning proton microprobe;Trace element   
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        发布时间：2021-04-09
      • He Chengfa Ba Weizhen Wu Qinzhi
        Issue 2, (1997)
        摘要：A semi-empirical electron transport model developed by Garth has been improved on the calculation of some parameters. The model was programmed for calculating dose enhancement effect quickly. The prediction of dose profile for Au/Al interface was in agreement with our 60 Co γ-ray data. The model was also applied to analyze the contribution of the individual secondary electron group to the dose enhancement factor.  
        关键词：Co γ-ray;Dose enhancement factor   
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        发布时间：2021-04-09
      • Liu Changshi Wu Guangming
        Issue 2, (1997)
        摘要：The first level plasmons of Si （located at B.E.116.95eV） and SiO 2 （located at B.E.122.0eV） in radiation hard and Si-SiO 2were investigated by XPS before and after 60 Co irradiation. The experimental results indicate that the interface consisting of the two plasmons extends toward the surface of SiO 2, and the centre of the interface moves toward the surface of SiO 2 after the irradiation. The concentration of plasmons depends on radiation dose, irradiation bias field and the growth process of Si-SiO 2.  
        关键词：Plasmon;Si-SiO 2;Radiation dose;Irradiation bias field   
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        发布时间：2021-04-09
      • Wei Luncun Zhao Ziqiang Han Jianwei Zhong Yuncheng Yu Jinxiang Wang Hao
        Issue 2, (1997)
        摘要：By using liquid nitrogen cooling of sputtered atoms in flowing gas, a cluster machine has been set up. With this machine, many kinds of metal and metal nitride clusters, such as Cu, Mo, Ta, AlN, TiN and TaN, have been successfully generated. The size of the clusters is between 2nm and 30nm. The cluster’s microstructure belongs to crystal structure.  
        关键词：Cluster;Composite cluster;Crystal structure   
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        <引用本文> <批量引用> 8415889 false
        发布时间：2021-04-09
      • Zheng Weiqiang
        Issue 2, (1997)
        摘要：The cross sections for the 154 Sm（n,2n） 153 Sm and 148 Sm（n,p） 148g Pm reactions have been measured by using the activation method relative to the cross sections of the 27 Al（n,α） 24 Na reaction in the neutron energy range of 14.5 14.9MeV. The results are compared with the published data. The neutron energies were determined by the method of cross section ratio of 90 Zr（n,2n） 89 Zr to 93 Nb（n,2n） 92m Nb.  
        关键词：Activation method;Activation cross section;Samarium   
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        <引用本文> <批量引用> 8415902 false
        发布时间：2021-04-09
      • Issue 2, (1997)
        摘要：The 6MV tandem accelerator, designed and developed by Shanghai Institute of Nuclear Research, was completed in 1992 and has been in operation for experiments since then. The main features of the accelerator as well as the experiences gained during the development and operation were presented in this article.  
        关键词：Tandem accelerator;Accelerator mass spectrometer;Laddertron;Accelerating tube;Negative ion source   
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        发布时间：2021-04-09
      • Ren Diyuan Yu Xuefeng Guo Qi Lu Wu Yan Rongliang
        Issue 2, (1997)
        摘要：Studied were the ionizing radiation effects and the annealing characteristic of L82C87 with SiO 2/Si 3N 4 compound gate structure as well as the mechanism of damage induced by irradiation. The feasibility of hardening the LSI circuits by applying the SiO 2/Si 3N 4 compound gate structure was also disscussed.  
        关键词：Integrated circuit L82C87;Total dose;Radiation effects;Annealing   
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        发布时间：2021-04-09
      • Kong Xiangzhong Li Gongping Yang Jingkang Liang Guozhao Dong Junming Qin Guangcheng Yan Aibang
        Issue 2, (1997)
        摘要：A microanalytic 4πβ counter with anticoincidence shield for 3H 2 in 3He is introduced. As a low background microanalysis device of gaseous tritium, this instrument has advantages such as simple structure, high accuracy and low detection limit [N （ 3H 2） /N（ 3He）<10 -11 ]. In this paper the structure and main performance of the counter is described and the test results for 3H 2 in 3He are given.  
        关键词：Anticoincidence shield;4πβ counter;Tritium   
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        <引用本文> <批量引用> 8415944 false
        发布时间：2021-04-09
      • Issue 2, (1997)
        摘要：用激光荧光法测定了上海原子核研究所１９８４－１９９３年环境地表水中的痕量铀，结果表明该所环境地表水中铀浓度仍属本底水平。  
        关键词：地表水;铀监测;本底水平   
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        发布时间：2021-04-09
      • Xiang Liang
        Issue 2, (1997)
        摘要：Sediment samples from Dianchi Lake sediment core were measured by means of the direct γ ray analysis for the sediment-depth profiles of natural radionuclides 210 Pb and 226 Ra and artificial radionuclides 137 Cs and 241 Am. The 226 Ra activity provides a direct measurement of supported 210 Pb activity for each sample analyzed, and the 137 Cs and 241 Am activity may provide independent age markers. The sediment core was dated with 210 Pb by using a constant rate of supply（CRS） model and the results were consistent with additional dating evidences from the artificial fallout nuclides 137 Cs and 241 Am. The study indicates that the sediment accumulation rates of Dianchi Lake were varied significantly during the past 100 years and had an accelerated accumulation rate in recent several years.  
        关键词：γ assay;Lake sediment;Radionuclides   
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        发布时间：2021-04-09
      • Issue 2, (1997)
        摘要：用能量为１１０ｋｅＶ、剂量为３×１０１７ｉｏｎｓ／ｃｍ２的Ｃ＋对单晶Ｔａ进行了注入，分析了注入层的成分分布及其结构，考察了注入前后表面层摩擦磨损性能的变化及其特征。结果表明，Ｃ＋注入层含有ｈｃｐＴａ２Ｃ及ｂｃｃＴａ（Ｃ）相，其强化效应造成了注入层硬度、耐磨性的提高和摩擦系数的下降；样品表面与淬火态ＧＣｒ１５钢球间的磨损机制也由未注入时的粘着磨损转化为注入后轻微的磨粒磨损。  
        关键词：离子注入;摩擦;磨损;结构表征   
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        发布时间：2021-04-09
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