最新刊期
      卷 0 ， 期 0 ， 2020
      • Yu Weizhong Weng Zili Jiang Qingming Cao Bisong Xu Zhan
        Issue 6, (1993)
        摘要：The positron mobility in GaAs has been measured at room temperature（294K）, in low electric field, a μ+ value of 880±40cm2V-1V-1 was obtained.  
          
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        发布时间：2021-04-09
      • Yu Fanghua
        Issue 6, (1993)
        摘要：Two fractured samples one corroded in artificial seawater and the other in air, have been investigated by positron annihilation spectroscopy. Both samples released hydrogen in the temperature regions from RT to 200℃ and from RT to 400℃, respectively. The results indicated that hydrogen enhanced fatigue defects and shielded from positrons localized in defects. From the deep points of the H- T and I2- T curves, it was discovered that hydrogen was released from grain boundary, dislocations and microvoids, respectively. In the first cracking stage grain boundary released more hydrogen than in the second stage. The interaction between hydrogen and microvoids made the volume and number of voids enlarge faster. The binding energies of hydrogen with grain boundary, dislocations and microvoids were estimated. The effect of hydrogen on corrosion fatigue fracture was discussed using da/dN-△K curve and SEM fracture appearance.  
          
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        发布时间：2021-04-09
      • Wan Dairong Dai Yunsheng Liang Xuecai Cao Jianhua
        Issue 6, (1993)
        摘要：The differential elastic scattering cross sections of 14.7MeV neutrons from Zr and Nb have been measured by the position-sensitive spectrometer and associated particle time- of- flight method at 7 angles ranging from 3° to 15° . The corrections for neutron fluence attenuation, multiple scattering and finite angle geometry are performed by using Monte- Carlo code. The experimental results are compared with the theoretical results based on the optical model.  
          
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        发布时间：2021-04-09
      • Zhou Sunxuan Wang Deshan
        Issue 6, (1993)
        摘要：The back-scattering X-ray Mossbauer spectroscopy has been used to analyze the corrosion products of low- carbon steel coated with alkydresin mixed with different pigments and corroded in HC1 containing atmosphere. The influence of the pigments on corrosion was studied. From this example, it is shown that this method is effective for corrosion studies of coated metal.  
          
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        发布时间：2021-04-09
      • Wu Mingfang Lai Chuxi Yao Shude Wang Xuemei
        Issue 6, (1993)
        摘要：A Si/CoSi2/Si/SiO2/Si（100） complex structure has been formed by using ion beam synthesis technique. Rutherford backscattering, channelling technique and electron channelling pattern given by scanning electron microscope have been used to analyse the formation of this structure at various stages. Such a structure is hopeful to be applied in the noval microelectronic devices, optoelectronic devices and three dimentional integrated circuits.  
          
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        发布时间：2021-04-09
      • Xu Guiqin Jin Huijuan Chen Mingxing
        Issue 6, (1993)
        摘要：The influence of γ-irradiation on brittleness of the amorphous alloy Fe78Si9B13 annealed at different temperatures has been studied. It is shown that the brittleness temperature of the γ- irradiated alloy rises by about 30℃. The measurements of Mossbauer effect, X-ray diffraction, and positron annihilation indicate that this is attributed to the slowdown of the alloy’s structure relaxation due to γ-irradiation before the crystallization.  
          
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        发布时间：2021-04-09
      • Tan Chunyu Xia Yueyuan Xu Bingzhang Liu Xiangdong Liu Jitian
        Issue 6, (1993)
        摘要：Density and thickness of SnO2 films have been measured by RBS combined with SIMS. The density of the SnO2 films prepared by using atmospheric pressure CVD method is about 6.20g/cm3. Fluorine concentration and distribution in the F-doped SnO2 films（FTO） as well as range distribution parameters, Rp and △Rp, of 19F+ ion- implanted SnO2 films have been measured by use of the 19F（p, a γ）16O resonance nuclear reaction. Fluorine concentration in FTO films varies with depth from 6.0 ×1020/cm3 to 0.6×1020/cm3. The experimental range parameters are compared with those obtained by the TRIM89 program. It is shown that the experimental Rp values agree with the TRIM values very well, but the experimental range straggling △Rp are larger. This phenomenon may be attributed to the enhanced diffusion during ion implantation.  
          
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        发布时间：2021-04-09
      • Shi Qicun Wang Mingqian Sun Jinhua
        Issue 6, (1993)
        摘要：The physical imitation experiments of the nuclear belt weight sealer （NBWS） were performed with a coal- loaded belt. The linearity, repetition and long-time stability of the NBWS were measured. And the influence of pile shape, load bias and the composition of coal on weight calculation were studied.  
          
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        发布时间：2021-04-09
      • Peng Xiufeng Long Xianguan Liu Mantian He Fuqing
        Issue 6, (1993)
        摘要：Natural silver foil stacks inserted between aluminium catcher and degrader foils were bombarded with 13.4MeV deuteron beam. The excitation functions of 107Ag（d,2n）107Cd and l09Ag（d,2n）l09Cd were determined and compared with other results in literature and the theoretical result. Quite good agreement with the latter was obtained.  
          
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        发布时间：2021-04-09
      • Zhang Guoqiang Yu Xuefeng Gao Wenyu Ren Diyuan Yan Rongliang
        Issue 6, (1993)
        摘要：γ-ray irradiation test of F implanted MOS capacitors after dry O2 gate oxidation has been performed, and post- irradiation characteristics of the MOS capacitors with different F implantation doses has been investigated. It is found that the gate oxide containing F can restrain radiation-induced oxide charges and interface states. The range of F implantation doses with the best restraining effects is about 5×1014 F/cm2- 2×1016F/cm2. It can be deduced that F on the interface of Si/SiO2 and in SiO2 will directly relate to the radiation effects of MOS devices, and the behaviors of F depend on the implantation condition. The experimental results are qualitatively explained.  
          
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        发布时间：2021-04-09
      • Li Guisheng
        Issue 6, (1993)
        摘要：In this paper the correction coefficient of the neutron dose equivalent for neutrons emitted from the intermediate energy heavy ion reactions 100MeV/u 12C + C and 41.7MeV/u 12C + Fe measured with the a 25.4cm single-sphere rem-meter is calculated.  
          
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        发布时间：2021-04-09
      • Han Shouling
        Issue 6, (1993)
        摘要：The contents of radionuclides in samples collected from the technological process of ZrOCl2 production was determined with a Nal（Tl） γ-ray spectrometer. The results show that the contents of radionuclides in ZrOCl2 were equal to those in soil and plentiful radionuclides in ZrSiO4 ore were nearly eliminated in the technological process.  
          
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        发布时间：2021-04-09
      • Cao Zhengbai
        Issue 6, (1993)
        摘要：A study on extraction of U（Ⅵ） and Th（Ⅳ） from nitric acid media by DEHSO and TBP is described. The distribution ratio of U（Ⅵ） from nitric acid medium by DEHSO is higher than by TBP, while the distribution ratio of Th（Ⅳ） is about the same for DEHSO and TBP. Therefore DEHSO exhibits a higher U-Th separation factor than TBP. The extraction reaction for U（Ⅵ） and Th（Ⅳ） is exoergic and the compositions of extracted species are UO2（NO3）2 2DEHSO and Th（NO3）4 2DEHSO. The back extraction of U（Ⅵ） and Th（Ⅳ） from DEHSO or TBP by 0.01-0.1 mol/1 HNO3 is also studied.  
          
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        发布时间：2021-04-09
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