最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 9, (1996)
        摘要：A thick natPb target was bombarded by 30MeV/u 12C ions.The separation of Hg element from Pb and many other elements produced in the reaction was studied by means of a melting Pb target-thermochromatographic device. Using milking method,208T1 daughter from the 208Hg β-decay was separated from Hg samples by liquid-liquid extyaction. Based on the energy of γ-rays emitted by 208T1 and its half-life, it is undoubtedly demonstrated that a new neutron-rich isotope 208Hg has been synthesized.  
          
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        发布时间：2021-04-09
      • Issue 9, (1996)
        摘要：This paper introduced the technical characteristics of the ceramic neutron tube with drive-in target and described the principle and the characteristics of the neutron generator which used the tube as a center part. This neutron generator has been successfully connected for the first time with MSI C/O 2727 tools of Dresser ATLAS Company in Jinn Oil-field and has begun to log practically.  
        关键词：Ceramic neutron tube with drive-in target;Neutron generator;C/O logging tools;Working life   
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        发布时间：2021-04-09
      • Issue 9, (1996)
        摘要：Several electric parameters of the mini-cyclotron have been studied, including the linearity of triangular wave voltage, the optimum extraction azimuthal, the installing requirement of dee electrode, etc. It has been proved that the result of this study is very useful to our actual engineering project.  
        关键词：Mini-cyclotron;Triangular-wave;Sine-wave;Electric field;Electrode;Dee-electrode   
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        发布时间：2021-04-09
      • Issue 9, (1996)
        摘要：The status of Tandem AMS at Shanghai Institute of Nuclear Research is described and the dating results for some ancient relics of Chinese civilization are reported.  
        关键词：Accelerator mass spectrometry（AMS）;Isobar;￣（14）C dating   
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        发布时间：2021-04-09
      • Issue 9, (1996)
        摘要：method of natural gamma-gamma spectrometry based on full gamma-ray spectra measurement is presented, and theoretical work for this gamma-ray measuring technique has been done.The experiments from model to field indicate that this method can give not only the contents of U, Th and K but also the lithologic information. The techniques, therefore,is convenient safe and feasible to use as a ground radioactivity measuring method.  
        关键词：Full spectra measurement;Natural gamma-gamma spectrometry;Gamma-ray low energy spectra;Effective atomic number   
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        发布时间：2021-04-09
      • Issue 9, (1996)
        摘要：The full energy peak efficiency calibration of a Ge（Li）detector has been made for cylindrical and well-shaped liquid samples with six different weights. The samples are prepared by using the standard solution with many radioactive nuclides in it. Two functions, i.e. efficiency vs. gamma-ray energy and efficiency vs.sample’sweight, are fitted by the least square method for two different shaped liquid sources respectively.Comparisons are conducted of the efficiency and the detection limit for two liquid sources with the same weight and different geometries.  
        关键词：Efficiency calibration;Ge（Li） detector;Cylindrical sources;Well-shaped sources;Fitting functions   
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        <引用本文> <批量引用> 8411726 false
        发布时间：2021-04-09
      • Issue 9, (1996)
        摘要：The radiation-induced free radical polymerization of styrene in the presence of methanol （MeOH）, tetrachlorocarbon （CCl4）and trans-stilbene as the additives was studied over the concentration range of 1×10-3-1×10-1mol/L at dose rate of 55Gy/min and total dose of 10kGy. The experiments were done at room temperature.It was shown that the conversion rates of styrene increased appreciably with increasing MeOH and CCl4, while the molecular weight of polystyrene decreased steadily. In the case of trans-stilbene the results were opposite. The GRP at low concentrations of additives was calculated. The GRP was found to be proportional to square root of MeOH concentration in keeping with WAS equation, but in the case of CCl4 and trans-stilbene, the situations were complicated.The mechanism of polymerisation in the presence of different additives was also discussed.  
        关键词：Styrene;Methanol;Tetrachlorocarbon;Trans-stilbene;Radiation polymerization;WAS equation   
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        发布时间：2021-04-09
      • Issue 9, (1996)
        摘要：A method for measuring trace elements in drinking water by PIXE technique is described. Trace elements concentrations in drinking water from high incidence district of gastric carcinoma, Qixia County, and low incidence district, Cangshan County, in Shandong Province are determined. The statistical data show that the concentrations of Ti, V, Cu, Fe and Sr in Qixia are significantly higher than those in Cangshan.  
        关键词：PIXE analysis;Gastric carcinoma;Trace elements;Drinking water   
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        发布时间：2021-04-09
      • Issue 9, (1996)
        摘要：One of the radon measuring techniques, i.e.the active carbon adsorption, is described in detail-A comparison with other techniques indicates that the active carbon adsorption method has advantages such as higher sensitivity, precision and anti-interference ability, larger detected depth and easier operation.  
        关键词：Active carbon method;Radon measurement   
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        发布时间：2021-04-09
      • Issue 9, (1996)
        摘要：The extraction mechanism of Th4+ with TBSA from the nitric acid medium has been studied by investigating the influences of[HNO3],[TBSA],[Th4+] and temperature upon the distribution ratio D of Th4+. The composition of extracted species is TI（NO3）4.TBSA.  
        关键词：Extraction;Thorium（Ⅳ）;N.N.N.N-tetrabutylsuccinylamid   
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        发布时间：2021-04-09
      • Issue 9, (1996)
        摘要：An overview on the characteristics of synchrotron radiation is given.The history and status of synchrotron radiation light sources are described.Some design concepts on the future light sources are introduced.  
        关键词：Synchrotron radiation;Synchrotron radiation light source   
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        发布时间：2021-04-09
      • Issue 9, (1996)
        摘要：The release behavior of 3He and other impure gases from titanium tritide films were analyzed by a quadrupole mass spectrometer（QMS） in an ultravacuum metal system with a limit vacuum of Z×10-7Pa. The 3He release fraction for two titanium tritide samples with initial atomic ratio of 1.68 and 1.69 were measured in a period of 410 days. It was shown that the release fraction of the two samples was maintained in 10-5 level when the 3He concentration in samples reachs to 0.1, and the release fraction was increased 5-10 times by vibration. Analysis of impurity release from titanium tritide film shows that samples, prepared in a glass vacuum system would be polluted by oil. The mechAnism of early 3He release from titanium tritide was also discussed in this paper.  
        关键词：?He;Titanium tritide film;Helium release fraction   
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        发布时间：2021-04-09
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