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      • Panxun Chen
        Vol. 11, Issue 4, (1988)
        摘要：The mechanism of CMOS circuits latch up in ionization radiation enviroment, several latch up elimination methods and the phenomenon of latch up window are presented. Major research results of eliminating latch up abroad in the last decade are reviewed. Some viewpoints of the author are also introduced.  
        关键词：ionization radiation;latch up;single particle upset   
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        发布时间：2022-08-16
      • Zikang Shi
        Vol. 11, Issue 4, (1988)
        摘要：The distributions of negative single empty sites and space electron density along the polar axis direction in polar crystals are theoretically studied. Positron annihilation technique is suggested to investigate the distributions.  
        关键词：Positron;empty site;polar crystal;Electron;Distribution   
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        发布时间：2022-08-16
      • Zhenxia Wang,Zhenlan Tao,Liping Zheng,Dexin Cao,Zhiyi Zou,Zuyao Zhou,Wei Zhou
        Vol. 11, Issue 4, (1988)
        摘要：The angular distributions of sputtered Cu and Au atoms have been measured under normal and oblique incidence bombardment with 27 keV Ar+ for Cu-Au (30 wt%) alloy. Sputtering material on Al collector has been analysed by RBS technique.The results indicate that copper atoms are ejected preferentially under oblique incidence bombardment (θT=40°) and the preferential ratio for oblique incidence is higher than that for normal incidence (θT=0°). From the angular distributions of sputtered copper atoms the ejection probability in the ejected angle region between 0° and 45° for oblique incidence is found to be lower than that for normal incidence.  
        关键词：oblique incidence;Angular distribution;preferential ejection   
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        发布时间：2022-08-16
      • Hui Zhu,Rongliang Yan,Yu Wang,Jinming He
        Vol. 11, Issue 4, (1988)
        摘要：The dependences of the flatband voltage shift (∆VFB) and the threshold voltage shift (∆VTH) in MOS system on the oxide thickness (Tox) and on total irradiated dose (D) of electron-beam and 60Co γ-ray have been studied. It has been found that ∆VFB∝Tox3, with+10V of gate bias during irradiation for n-Si substrate MOS capacitors, , with "on" gate bias during irradiation for n- and P-channel MOS transistors; , with "off" gate bias during irradiation for P-channel MOS transistors. These results are explained by Viswanathan model. According to dependence, the optimization of radiation hardening process for MOS system is also simply discussed.  
        关键词：ionizing radiation damage in MOS;gate oxide thickness;radiation-induced oxide charges and interface states;flatband voltage shift;Threshold voltage shift;radiation hardening   
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        发布时间：2022-08-16
      • Xin Zhang,Liu Yang
        Vol. 11, Issue 4, (1988)
        摘要：Three (8, 14-2H2) -tetrahydroprotoberberines (tetrahydroberberine, tetrahydropalmatine and stepholidine) were prepared conveniently by NaBD4 reduction of the corresponding protoberberines. The configuration of deuterated compounds was confirmed by MS, 1H-NMR and IR spectra.3H labelled stepholidine and tetrahydroberberine were prepared similarly. The specific activity and radiochemical purity of 3H labelled stepholidine are 6.65GBq/mmol and 95% respectively. The specific activity and radiochemical purity of 3H labelled tetrahydroberberine are 8.53GBq/mmol and 98% respectively.  
        关键词：Deuterium;Tritium;tetrahydroprotoberberine;tetrahydropalmatine;stepholidine   
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        发布时间：2022-08-16
      • Lianxue Gu,Anquan Le,Yingmei Gu,Liren Jiang,Fasheng Han,Jinxin Lin
        Vol. 11, Issue 4, (1988)
        摘要：A thickness gauge combining the techniques of X-ray fluorescence analysis and microcomputer has been designed for precise determination of titanium coating. Its measurable thickness ranges from 0.1 to 10 micrometer. The minimum measurable area is 3 mm in diameter. Practically the accuracy is better than 5%.  
        关键词：accuracy;coating;X-ray fluorescense;instrument system   
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        发布时间：2022-08-16
      • Zhenye Xu
        Vol. 11, Issue 4, (1988)
        摘要：The design of a spark chamber absorption spectrometer with electroluminescence display is presented. After analysis for the relevant physical process, the source of main errors and their order of magnitude are described. The results show that this design is applicable.  
        关键词：spark chamber spectrometer;particle stopping time;error display;false event   
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        发布时间：2022-08-16
      • Guanxiong Bao
        Vol. 11, Issue 4, (1988)
        摘要：A special instrumentation microcomputer designed for neutron-gamma moisture and density gauge is described. Based on a Z80 CPU with 4k bytes ROM and 2k bytes RAM it provides functions of display, keyboard, print and communication in the simplest way. Used as a neutron-gamma moisture and density gauge it has five work modes: parameter input, check, calibration, scaler and moisture-density measurement. The period of measurement can be chosen from one second to hours. The system is applicable in other cases and, in fact, has been used as fluorescence analyzer and Mössbauer spectroscopy successfully.  
        关键词：neutron moisture gauge;gamma density gauge;neutron-gamma moisture and density gauge;special instrumentation microcomputer   
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        发布时间：2022-08-16
      • Tingwen Rong,Jinrong Bao,Senhao Lin
        Vol. 11, Issue 4, (1988)
        摘要：A method of substoichiometric isotope dilution analysis for determination of the concentration of neodymium in polyacetylene is described. Neodymium is a necessary component in preparation of polyacetylene film using rare earth catalyst and the concentration of the residual neodymium catalyst in polyacetylene will influence the stability of film. The sensitivity of this method is about 0.05µg Nd.  
        关键词：substoichiometric;Isotope dilution;polyacetylene;neodymium   
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        发布时间：2022-08-16
      • Qi Yan,Muyao Zhou,Ruide Ma
        Vol. 11, Issue 4, (1988)
        摘要：A low energy, self-shielded electron beam machine for the surface coating curing of wood panel and gypseous plate was introduced. The quality control during the electron curing process such as the coating technology in top-layer, the influence of coating-layer thickness on the property of coating surface, and the dose and dose distribution in the radiation field was also discussed. An unsaturated polyester resin, as a main component in our EB coating, was synthesized and compared with several other EB coatings. The properties of coating layer on the surface of wood panel after curing were characterized  
        关键词：self-shielded accelerator;Quality control;coating technology;coating-layer thickness;unsaturated polyester;curing condition   
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        发布时间：2022-08-16
      • Wendi Ding,Yulin Hu,Renbin Zhang,Yuyuan Xie,Maosong Jiang,Meichu Luo,Chuanfen Xu
        Vol. 11, Issue 4, (1988)
        摘要：Two C18 reversed-phase chromatographic systems were used to determine the log k' values of thirty-six substituted acetanilido-iminoacetic acids. The relationship between log k' values of ligands with substituents in different positions and their theoretical hydrophobicities ∑π was examined. The relationship between log k' values of ligands and the distribution of their labelled complexes in liver, gallbladder and small intestine was investigated. The factors affecting hepatocellular transit rate of drugs were discussed  
        关键词：reversed-phase HPLC;hydrophobicity;linear regression;in-vivo distribution   
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        发布时间：2022-08-16
      • Siying Zheng,Shoupeng Zhu,Caiying Zhu
        Vol. 11, Issue 4, (1988)
        摘要：The radiogenotoxicological effect such as chromosome aberrations in germ cells and abnormalities in sperm induced by fission fragment 147Pm in different periods after iv this radionuclide to mice was observed. Results indicated that chromosome aberrations of spermatogonium were induced by 147Pm. The chromosome aberration rates and polyploid cells number were increased with the periods of contamination of 147Pm. At the same time 147Pm also induced chromosome fragments and translocations of primary spermatocyte. It was shown that polyvalent of primary spermatocyte appeared only after 10 days of 147Pm contamination.  
        关键词：Fission product;147Pm;spermatogonium;primary spermatocyte;sperm;Chromosome aberration   
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        发布时间：2022-08-16
      • Guanxiang Huang,Ruifei Zhu,Lifen Zhu,Riyou Luo
        Vol. 11, Issue 4, (1988)
        摘要：By tail i.v. to normal mice, the radioactivity in blood, muscle, viscera, urine and feces were determined homogeneously according to different time interval. The information on distribution in various tissues and excretion in urine and feces was also obtained.  
        关键词：3H-labelled ademine arabinoside;Distribution in vivo   
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        发布时间：2022-08-16
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