最新刊期
      卷 0 ， 期 0 ， 2020
      • Bai Kuichang Yin Guocheng Jiang Ziying
        Issue 10, (1993)
        摘要：The Mossbauer spectra of some slag samples were measured at room temperature. The spectra are fitted with three quadrupole split doublets which refer to Fe2+and Fe3+ with different micro-environments. According to the Mb s sbauer spectrum data of FexO in literatures, the main substance in the slag samples is considered to be FexO. An X-ray diffraction analysis gave the same result. The relative content of Fe2+ and Fe3+ ions in the slag, calculated according to the corresponding sub-spectra area ratio,is 85% and 15% respectively for some different samples. The SCF MS- Xα method was used to compute charge densities and electric field gradients at nuclear site. An agreement was obtained between the calculated charge densities and the measured isomer shifts. However, the calculation should be improved for a better consistence between the calculated electric field gradients and the measured quadrupole splits.  
          
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        发布时间：2021-04-09
      • Shi Zikang
        Issue 10, (1993)
        摘要：A 22Na positron annihilation life-time spectroscopy method is applied to the measurement of solid surface film. In this paper the principle of the experimental method and the practical technique used to measure solid surface film have been expounded for thin metalfilm under the conditions of constant temperature and equal space volume occupied by metal atoms.  
          
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        发布时间：2021-04-09
      • Li Anli T.Iwata Li Donghong Zheng Shengnan Huang Hanchen Zhu Shengyun
        Issue 10, (1993)
        摘要：The positron annihilation lifetime measurements have been performed to study the defects and radiation damage in the 1.45×1020n/cm2 and 3.10×1017n/cm2 neutron irradiated silicon as a function of annealing temperature from 343 K to 1073 K. The oxygen- vacancy （O- V） pairs were observed in both high and low dose neutron irradiated silicon samples and the quadrivacancies were detected during the annealing process in the high dose neutron irradiated silicon only. The measured short lifetime τ1 is a weighted average of lifetimes of positrons annihilated in bulk and those trapped at the O-V pairs. The long lifetime τ2 is attributed to positrons trapped at the divacancies or quadrivacancies.  
          
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        发布时间：2021-04-09
      • Xu Yusheng Yang Xianqing
        Issue 10, (1993)
        摘要：The Mbssbauer spectrum of amorphous alloys in radio frequency field shows a collapse effect. By means of the measurement of the thermal red shift of the spectrum and the observation of the aftereffect of a relatively stronger rf field the mechanism of the collapse effect was investigated. The temperature increases of the samples showing a full collapse effect in a rf field were calculated. It is concluded that samples in rf field remain below the Curie temperature. The aftereffect can be well understood with the model based on the random fluctuation of magnetic atomic clusters caused by rf field. It is confirmed that the collapse effect observed is exerted by the rf induced random fluctuation of magnetic clusters rather than a ferromagnetic- paramagnetic transition in consequence of the rf heating.  
          
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        发布时间：2021-04-09
      • Lu Rongrong Wang Wenmin Zhu Jieqing Le Anquan
        Issue 10, (1993)
        摘要：The method of measuring micron-scale elemental distribution with microbeam backscattering technique is described. This method is shown to be reliable and effective by measuring Si3N4/SiC interface by proton microbeam non-Rutherford elastic backscattering. Thus, various kinds of nuclear techniques （PIXE, ion beam backscattering, etc） can be applied to non- destructive analysis of samples from light to heavy elements by using the Shanghai Nuclear Microprobe.  
          
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        发布时间：2021-04-09
      • Cai Wei Qian Xing Dai Guangxi Liang Guozhao
        Issue 10, (1993)
        摘要：A double particle identification system of time-of-flight and △E-E telescope has been designed and tested for measuring M and Z of the residues in heavy ion fusion reactions simultaneously. Experimeneal resultes showed that the charge resolution of this system is better than 25 and the mass resolution is 45.  
          
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        发布时间：2021-04-09
      • Zhu Peiran Jiang Weilin Xu Tianbing Zhou Junsi Ren Mengmei Zhai Yongliang
        Issue 10, (1993)
        摘要：The main facilities, analysis methods, the work on ion implantation and material modifications in Ion Beam Laboratory, Institute of Physics, Academia Sinica are introduced. Applications in semiconductors, high Tc superconductor materials and the environment science in recent years are described.  
          
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        发布时间：2021-04-09
      • Zhu Guanghua Wang Xinfu Shen Xinyin
        Issue 10, (1993)
        摘要：In this paper, our experimental design, the methods of solving some specific problems and the details of giving quality assurance and quality control in two international cross- checks of PIXE analysis are presented.  
          
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        发布时间：2021-04-09
      • Ding Lili Yang Remain Hong Pingshun
        Issue 10, (1993)
        摘要：Samples of human hair and feces have been investigated by NAA. Trace elements Cu,Zn,Ca,Mn,Al and Mg were determined. Elemental concentrations in samples from normal persons and from patients with Wilson’s disease have been compared. The variation of elemental concentrations in hair and feces samples taken from patients before- and after- cure, was also studied. The analytical results show that Cu in feces from patients is remarkably lower than that from normal persons; patients before-and after-cure have no significant differences in Cu; and there are significant differences for Al and Ca in hair and Al, Ca and Mg in feces between patients and normal persons.  
          
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        发布时间：2021-04-09
      • Li Shuzhong Hou Chunrong Luan Dong He Zhongda Zhang Wanxi
        Issue 10, (1993)
        摘要：The effect of y- radiation on dynamic viscoelastic properties and thermal behavior of low density polyethylene （LDPE） has been investigated. The store energy modulus （E’） of the irradiated samples is increased. The (3 and a transition is shifted to higher temperature with increase of irradiation dose. The results of thermal analysis show that crystal melting temperature （Tm）, enthalpy （△Hm） and crystal disapperance temperature （Td） for irradiated samples are decreased with increase of dose.  
          
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        发布时间：2021-04-09
      • Zhu Lianfang
        Issue 10, (1993)
        摘要：A method to calculate the concentrations of accelerator- induced radionuclides in the accelerator hall is presented. The evaluation of concentration distribution of accelerator-induced radionuclides and radiation doses to the public has been performed. The feasibility of the method is discussed.  
          
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        发布时间：2021-04-09
      • Wang Haiying Huang Hanjiao Luo Xianqing
        Issue 10, (1993)
        摘要：Living small animals and phantoms were irradiated with neutrons in a radiation field formed by a 238Pu-Be source. Then a Nal（Tl） detector installed in a lead shielding room was used to measure the characteristic γ-rays originated by nuclear reaction 31P（n, α）28A1. The net integral counts of full- energy peaks from animals and phantoms were compared and the phosphorus content was calculated. An almost linear relation between the net integral counts and phosphorus content in phantoms was observed. The phosphorus percentage were measured for twenty mice by both IVNAA and ultra-violet spectroscopic analysis. Their differences were within 18%.  
          
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        发布时间：2021-04-09
      • Cheng Yexun Zhang Ye Wang Zhuwen
        Issue 10, (1993)
        摘要：Based on the collection and analysis of a great amount of information, this paper briefly reviews the application of nuclear techniques in geosciences. It is shown that the nuclear techniques are rapid, effective and economic in solving the problems of geosciences.  
          
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        发布时间：2021-04-09
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