最新刊期
      卷 0 ， 期 0 ， 2020
      • Shao Qiyun
        Issue 10, (1991)
        摘要：In this paper, energy distributions of sputtered particles are investigated by using the linear cascade theory and Monte Carlo simulation based on the binary collision approximation. The shape of energy distributions and the dependence of energy distributions on the angle of incidence arc discussed. Furthermore the effect of two-component target composition on the mean energy of sputtered particles is presented.  
          
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        发布时间：2021-04-20
      • Xu Junquan
        Issue 10, (1991)
        摘要：A new calculation model for L-vacancy deexcitation processes of heavy elements has been put forward. By using the model, Goldberg’s LX-ray intensity spectra produced by 50 keV electron impact on metallic elements and measured by a curved crystal spectrometer were analyzed, and the L-subshell fluorescence yields of ten elements ranging from Ta to Bi were obtained. The Present values of ω1, ω2 and ω3 are all in good agreement with the measurements reported in recent years, but different evidently from Krause’s semiempirical compilation for elements around Z = 80. The new ω1 values are about 20% more than the compiled and about 55% more than the last theoretical data for elements around Z=80.  
          
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        发布时间：2021-04-20
      • Peng Yuqing Zhang Yiping
        Issue 10, (1991)
        摘要：LiF crystals were irradiated with 60Co γ rays at 25℃ and - 70℃ respectively. Dose ranged from 5.1×102 to 1.3×105Gy. Optical absorption spectra and positron annihilation radiation Doppler broadening were measured at room temperature. The changes of F center concentration and S parameter with dose were given and the results were discussed.  
          
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        发布时间：2021-04-20
      • Tian Jibing Qian Qinfang Chai Zhifang
        Issue 10, (1991)
        摘要：In this work the conventional neutron activation analysis, γ-γ coincidence spectrometry and cyclic neutron activation analysis were used to determine selenium contents in some environmental and botanic samples. The applicability of these methods was discussed and the comparison with the non-dispersive hydrogen flame atomic fluorescent spectrometry was made. The volatile loss of selenium at high temperature was also studied.  
          
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        发布时间：2021-04-20
      • Wang Jianguo Jiang Jianling
        Issue 10, (1991)
        摘要：A computer program in BASIC language used on the APPLE-Ⅱ computer is presented for data processing of γ spectrum from standard sources. The main characteristics and functions of this program and final results of processing are given.  
          
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        发布时间：2021-04-20
      • Song Zhongheng
        Issue 10, (1991)
        摘要：A set of equations for investigating transverse instability of a bunch of high current short pulse beam in the electron linac is developed, and the result of numerical calculation is given.  
          
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        发布时间：2021-04-20
      • Li Xiqi Ni Guizhang Shen Manlin Gao Aizhen Zhang Yong
        Issue 10, (1991)
        摘要：An experimental apparatus and a prototype have been designed to measure density of concrete according to the principle of backscattering and transmission of γ ray with a measuring depth of up to 500mm. Through experiments, the source, detector, optimal geometry, calibration system, math model, calculating programs, electronics and microcomputer were established. Thirty sets of ND-50 nuclear density gauge have been trial-produced or reproduced, and applied to control the quality in roller compacted concrete dam （RCCD）. for at least 5 γ 105 m3 in more than ten hydraulic and hydroelectric projects.  
          
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        发布时间：2021-04-20
      • Wang Guanghou Zhang Haiqian Luo Chenglin
        Issue 10, (1991)
        摘要：Obvious changes have been observed in the Hg+-implanted SBN crystals doped with rare-earths and alkaline metal by X-ray diffraction and temperature-dependence measurements of the dielectric constant, namely, （1） decrease in intensities of X ray diffraction, （2） anomaly of the diffraction patterns for Hg+-implanted PrSBN, and （3） increase in critical exponents of the dielectric constants.  
          
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        发布时间：2021-04-20
      • Rong Tingwen Wang Wenmin Wan Honghe Lin SenhaoBao Jinrong Sun Jianhua Cheng Yuandi
        Issue 10, (1991)
        摘要：Some biological and material samples have been investigated by 14.2MeV proton activation analysis using internal standard. The concentration of elements Ti, Cr, Fe, Ni, Cu, Zn, Ge and Nd in these samples have been determined with sensitivities of 10-6-10-8g/g.  
          
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        发布时间：2021-04-20
      • Tong Chunhan Liu Lei
        Issue 10, (1991)
        摘要：Samples of ore, water and soil in a copper deposit were collected. The contents of U, K, Th and other trace elements were determined by INAA, while Ra content was analysed by natural radioactivity survey. The results indicated uranium enrichment in the ores in contrast to in the soil around living area where equilibrium coefficient<1. So appropriate keeping of the copper ores was thought to be very important to protect the environment against pollution of radioactivity （uranium）. Since gold and rare-earth elements enrichment in the ores were found, a suggestion of comprehensive utilizing the copper resources was put forward.  
          
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        发布时间：2021-04-20
      • Wang Ketai Wang Meiquan
        Issue 10, (1991)
        摘要：A chloramine oxidizing resin has been prepared using nylon-6 as monomeric unit and by the method of substituting hydrogen by active chlorine （Cl+） in hypochlorous acid. The synthesis, oxidizing characteristics and applications in iodine-labelled Pharmaceuticals of the resin are described. A labelling rate of 96% has been obtained for labelled 125I-iodocho-lesterol using this resin.  
          
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        发布时间：2021-04-20
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