最新刊期
      卷 0 ， 期 0 ， 2020
      • Le Anquan Lin Jinxin Zhu Jieqing Gu Yingmei Gu Lianxue Han Fasheng Xu Junquan Wang Yuzheng Wang Zhifang
        Issue 9, (1991)
        摘要：This instrument was based on the XRF technique and microcomputer. X-ray radiation from a small X-ray tube was collimated with a small hole and the emitted fluorescence spot at the surface of a sample could be seen with an optical microscope. The minimum diameter of the measuring area was 0.1mm. A microcomputer-based MCA was used. The unit was able to measure thickness of either single or double coating layers noEdestructively and determine thickness and composition of an alloy coating layer simultaneously.  
          
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        发布时间：2021-04-20
      • Wu Weifang Li Yinhua
        Issue 9, (1991)
        摘要：The Mossbauer effect combined with XPS, IR and X-ray diffraction, was used to study the complex of crystal violet and ferric chloride. After complexing, the electronic configuration is changed. The lone pair electron of nitrogen atom in crystal violet molecule transfers into the outer orbit of Fe3+ ion forming a substance which is similar to donor-acceptor complex. Therefore, the properties of crystal violet are varied.  
          
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        发布时间：2021-04-20
      • Zhu Jieqing Li Minqian Mao Yu Chen Hanmin Gu Yingmei Yang Changyi Sheng Kanglong
        Issue 9, (1991)
        摘要：A new scanning proton microprobe equipped with a long focus Russian magnetic quadruplet is set up. With excellent performances of ion optics, it can be used to do experiments of PIXE, RES, RFS, NRA and channelling simultaneously within a micron-region. The power supplies for quadruplet and scanning coils are controlled by an IBM-PC computer and a scanning graphical monitor based on an Apple Ⅱe microcomputer provides convenience of searching for an interesting area to scan. The advanced modes of the fast random scan and the event-by-event data collection make it possible to treat the multi-parameter and multi-detector data by means of the strategy of TQSA （Total quantitative scanning analysis） There are three types of graphical display including the innovation of three dimensional contour mapping.  
          
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        发布时间：2021-04-20
      • Yin Chuanyuan Sun Zhengmin Shen Dexun
        Issue 9, (1991)
        摘要：The positron lifetime and DSC measurements have been made for EBBA samples in the heating and cooling cycles. The experimental results show that the shorter lifetime （τs） is essentially independent of temperature while the longer lifetime （τL） and the intensity （IL） change obviously. In the heating and cooling cycles the transition temperatures are different. This phenomenon has been explained by using the ORE model and the change of micro-structure of liquid crystal during the phase transition.  
          
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        发布时间：2021-04-20
      • Wang Baolin Liu Fengling
        Issue 9, (1991)
        摘要：The method and devices for luminous properties’ measurement of ST-401 plastic scin-tillators under 14.8 MeV neutron irradiation are described. The fluorescence monochromatic energy relative conversion coefficients Kλ and the integral energy relative conversion coefficients K are measured for the scintillators with various dimensions. The curves of spectral photo-response and monochromatic energy brightness vs. thickness for various scintillators are also given.  
          
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        发布时间：2021-04-20
      • Zhao Qiren Yan Erkun Zhang Fuhua Lin Han
        Issue 9, (1991)
        摘要：Measuring error involved in the efficiency tracing technique was shown to be increased with the chemical or colour quenching level of the tested sample and the error might become negative when the colour quenching was strong. The effects of different scintillation solutions and volumes on the error were found negligible. Appropriate methods for fitting the effici-ency tracing curve appeared very important.  
          
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        发布时间：2021-04-20
      • Zhang Fang Xu Kezun Weng Huimin
        Issue 9, (1991)
        摘要：The high-voltage plateau curve, pulse amplitude distribution and efficiency curve were measured with electron and positron beams. The variation of threshold voltage and plateau starting voltage with electron energy, the variation of gain with high-voltage, the relation between pulse amplitude and electron energy, the variation of pulse amplitude and counting rate with beam current, and the variation of background with high-voltage were also measured with electron beams.  
          
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        发布时间：2021-04-20
      • Li Weisheng Li Wenxin Shen Cuihua
        Issue 9, (1991)
        摘要：A method for fitting a n-componentdecay curve without iterative procedure is presented. Artificial data with errors generated by the Monte Carlo method were used to test the validity of the present method and good results were obtained.  
          
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        发布时间：2021-04-20
      • Hua Mingda Shi Tingling
        Issue 9, (1991)
        摘要：The magnetic field measurement on the electron storage ring of HERA Proton-Electron Collider in Germany is described. This paper covers the methods of field measurement oa the dipoles and quadruploes, including the scheme, searching and suppressing noises as well as the results of measurements. An accuracy of 1.5×10-4 has been acquired.  
          
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        发布时间：2021-04-20
      • Yu Caiqin Li Guozhen Bian Hongxia Xu Xunjiang
        Issue 9, (1991)
        摘要：Gamma ray self-absorption correction for cylindrical volume-sources is described. Four kinds of solution were prepared, with densities of 1.0, 1.25, 1.50 and 1.83g/cm3 respectively. From each solution six sources with different thicknesses were made. The Gamma ray energies used were between 122.1 keV and 1332.5 keV. The self-absorption correction factors were determined. They were consistent well with the results of theoretical calculation within an error of about 5%. The efficiency curves for cylindrical volume-sources with various thicknesses were drawn by the least square method. The optimal thickness for cylindrical volume-sources was given.  
          
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        发布时间：2021-04-20
      • Wu Jinhai Li Jinquan Pei Yongfa
        Issue 9, (1991)
        摘要：An analytical method for main radioactive nuclides in building materials is described. It was used in determining radioactive level in building materials used in Shanghai. The radioactive levels measured were found to be all within the limits allowed by the State Standard on Radiological Health.  
          
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        发布时间：2021-04-20
      • Zhang Hongliang
        Issue 9, (1991)
        摘要：This paper reported the synthesis of [4’-3H]-1-methyl-4-pheny 1-1,2,3,6-tetrahydroa pyridine hydrochloride （3H-MPTP.HC1） from l-methyl-4-（4’-bromophenyl）-4-hydroxyl-piperidine through catalytic halogen-tritium replacement. The tritiated product was obtained with a specific radioactivity of 1.16 TBq/mmol and a radiochemical purity over 95%.  
          
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        发布时间：2021-04-20
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