最新刊期
      卷 0 ， 期 0 ， 2020
      • He Zhiyong
        Issue 12, (1993)
        摘要：The time and energy calibration of the silicon detector has been done by using the secondary beam from 16O at 95MeV/u. The results proved that the secondary beam can be used to calibrate the detector satisfactorily because of its long flight distance and a variety of secondary particles.  
          
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        发布时间：2021-04-09
      • Rong Tingwen Lin Senhao Wan Honghe Bao Jinrong Wang Wenmin Sun Jianhua
        Issue 12, (1993)
        摘要：In this paper studied was the influence of ion implantation doping on the conductivity of polyaniline. Its three states （leucoemeraldine, emeraldine and pernigraniline） and their structural changes after ion implantation were researched by using infrared absorption and ultraviolet absorption methods. The results showed that the ion implantation is reductive for all the states. Mechanism of conductivity induced by ion implantation was also discussed.  
          
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        发布时间：2021-04-09
      • Zhang Yuanxun
        Issue 12, (1993)
        摘要：This paper deals with the toxic effects of selenium uptakes in the tissues of marine fish. The selenium concentrations in skin, liver, muscle and gill of the fish were determined by PIXE technique. The enzyme levels in liver tissue were also measured and evaluated. The results showed that the 50% lethal dose was LD50=0.29 μg/g. The enzyme levels in fish died following the injection were found independent on the injected dose. The enzymes in surviving fish showed a gradual and complete recovery during the observation period. A very low Se uptake in muscle was found. The biological half lives of Se concentration in liver and gill were nearly identical, while the skin exhibited a half life 2.5 times greater.  
          
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        发布时间：2021-04-09
      • Jiang Shan Jiang Songsheng Guo Hong Yang Bingfan Du Xueren
        Issue 12, (1993)
        摘要：The accelerator mass spectrometer based on Beijing HI-13 tandem accelerator and the experimental measurement of 36C1/C1 ratio have been described. The sensitivity of 36C1/C1 measurement with the AMS has been reached better than 3×10-15. The measured 36C1/C1 ratios range from 1.2×10-12 to 2.2×10-14 for the ground- water, salt lake and uranium ore samples.  
          
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        发布时间：2021-04-09
      • Wei Baojie Yue Chengbo Li Wensheng Lu Hongbo
        Issue 12, (1993)
        摘要：The ceramic neutron tube with a drive-in target reported in this paper has advantages of high temperature resistance, good stability and long life-time. The tubes have been used for C/O oil- well logging, prawn irradiation and so on. A tube could probe 60 oil-wells and its life-time in practical oil-well logging was 400h. The average life- time of the tubes in the ground applications was more than 500h.  
          
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        <引用本文> <批量引用> 8403162 false
        发布时间：2021-04-09
      • Chan Yongheng
        Issue 12, (1993)
        摘要：The separation of individual minerals from meteoritical polished sections and their instrumental neutron activation analysis （INAA） have been described. The trace element concentrations of oldhamite （CaS）, niningerite （MgS）, djerfisherite, troilite, and phases of A and B in some enstatite chondrites have successfully been analyzed by this method and the contamination with metal phase for these minerals have been discussed.  
          
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        发布时间：2021-04-09
      • Xi Dexun Sha Xiangyue
        Issue 12, (1993)
        摘要：The frequency stability of the frequency stabilization system is dependent on the loaded figure merit of the resonant cavity. To increase the figure merit infinitely is not correct because the power spectrum has a （siny/y）2 form for the pulse magnetron which is the power source of a LINAC. From the Parseval theory, area of the output signal of the square-law detector terminatied by the cavity will be directly proportional to output energy of the cavity so that the variation of the signal area is equivalent to that of output energy as oscillation frequency of the magnetron is changing. On the basis of this principle, a recommended expression and the upper limit of the figure merit are given.  
          
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        发布时间：2021-04-09
      • Jiao Guiyue
        Issue 12, (1993)
        摘要：The ionization efficiencies of the high work function metal sheets, such as Ta, Fe, W, Ni, Re and Pt ionizers, were studied and compared between them by calculating the degree of ionization and positive ion densities as well as measuring the target currents and negative ion beam intensities. It was shown that Fe as a kind of general metal, was also a better ionization material. The effects of surface temperature, pressure of cesium vapour and surface work function on the surface ionization process were also discussed.  
          
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        发布时间：2021-04-09
      • Zhou Zuming
        Issue 12, (1993)
        摘要：A method is presented for separating and determining low levels of plutonium and americium-241 in radioactive saturated rock-salt solution. The plutonium and americium- 241 are isolated from fission products by anion exchange on Dowex- 1×4 and solvent extraction with HDEHP. The ratio of recovery are 85% for plutonium and 90% for americium- 241 respectively.  
          
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        发布时间：2021-04-09
      • Ge Cailin Luo Shishi Gong Jian Zhang Hao
        Issue 12, (1993)
        摘要：The dynamic change of exporting velocity for C-photosynthate in rice leaves was determined by the analytical technique of nutrient tracer kinetics in living plant. A mathematical model of exporting for photosynthate in the leaves was established. The method of measuring and calculating values of parameters was given, and the parameters for translocation of photosynthate in leaves of rice Xiangaiyou were determined. The results show that the exporting velocity of 14C-photosynthate is adjusted by mutli- factors, and the dynamics of remains and exporting velocity for 14C- photosynthate in rice leaves dose not an follow exact exponential decay process but has some fluctuation characteristics between day and night.  
          
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        发布时间：2021-04-09
      • Zhang Xin Yang Zhengxiu Xu Ping Ding Ruiqin
        Issue 12, (1993)
        摘要：Grignard addition of 14CH3MgI to methyl ester of 4-keto-4-nortetrahy-droartemisinic acid （3） gave （15-14C） 4-hydroxytetrahydroartemisinic ester （4 α）. 4α was dehydrated with P-toluenesulfonic acid in benzene followed by alkaline hydrolysis to obtain a mixture of dihydroartemisinic acid （5 α） and its isomer （6α）. The mixture was oxidized with OsO4 and N-methylmorpholine-N-oxide to give （15-14C） dihydroartemisilacton （2α） and （15-14C） 3,4-dihydroxyartemisinic acid （7α）. In addition the corresponding 13C and 2H labelled compounds were also prepared.  
          
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        <引用本文> <批量引用> 8403107 false
        发布时间：2021-04-09
      • Issue 12, Article number: 766(1993)
        摘要：<正> 1992年,各会员单位申报了“辐射加工技术与产品重点推广项目”,经理事长会议初选,专家组评审,辐射加工专业委员会一届二次理事会全体会议审议通过,由中国同位素与辐射行业协会推荐,确定26个项目为“全国辐射加工行业1993年重点推广项目”。为了更广  
          
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        <引用本文> <批量引用> 8403174 false
        发布时间：2021-04-09
      • Issue 12, Article number: 767(1993)
        摘要：<正> 第11次国际离子束分析会议（IBA—11）于今年7月5—9日在匈牙利布达佩斯近郊的巴拉顿湖畔举行。来自31个国家的300多位代表参加了会议。会议内容覆盖了有关离子束分析的所有课题,会上交流了260篇文章,其中166篇以大字报形式交流发表,其余则为口头报告。本文作者在会上宣读了在国家自然科学基金资助下完成的课题论文“八种轻元素的非卢瑟福  
          
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        发布时间：2021-04-09
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