最新刊期
      卷 0 ， 期 0 ， 2020
      • Huijuan Jin,Ruqin Chang,Guiqin Xu
        Vol. 13, Issue 6, (1990)
        摘要：The Mössbauer second-order Doppler shift (SODS) is a relativistic effect of thermal motion of atoms. It is one of the Mössbauer parameters. The isomer shift and Debye temperature θD can be obtained by means of studying the dependence of the SODS on temperature of the absorber.The principle and method of evaluating the SODS are described by using the Debye model in this paper. Debye temperature θD and the SODS at each measuring temperature for α-Fe sample have been calculated. The results are compared with the values reported in literatures and the theoretical values of the SODS for 57Fe.  
        关键词：Mossbauer effect;Second-order Doppler shift   
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        发布时间：2022-08-16
      • Lingyan Chen,Kaihua Xiang,Zongying Wei,Chongfan He,Zhiwen Yin
        Vol. 13, Issue 6, (1990)
        摘要：The radiation damage of doped BGO is studied by measuring positron annihilation lifetimes and Doppler broadening S parameters. Under the irradiation of UV and Co-60 γ ray of 150Gy, a new lifetime component has been observed for some doped BGOs, especially for impurity element Pb doped BGO. Our results are in agreement with a former study on the fluorescence output. Finally, the radiation damage mechanism is discussed.  
        关键词：Positron annihilation;Doped BGO crystal;Radiation damage   
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        发布时间：2022-08-16
      • Xueheng Yang,Chengdan Lu,Yiqiao Yu,Ziqiang Yun
        Vol. 13, Issue 6, (1990)
        摘要：A new species of organic liquid scintillator, called LSPN, is invented by the authors. It has two kinds of subgroup, LSPNJ and LSPNI, containing 10B and 127I respectively. The former is mainly used for the detection of thermal and slow neutrons, and the latter, of fast and slow neutrons. LSPNJ can be applied in on-line monitoring while LSPNI in off-line so as to avoid the interference of a strong gamma ray field. Their measurement errors are lower than 10% and efficiencies higher than 70%.  
        关键词：Liquid scintillator;Neutrons   
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        发布时间：2022-08-16
      • Tonghe Zhang
        Vol. 13, Issue 6, (1990)
        摘要：The profiles of displacement atoms in InP implanted by N+ and Bi+ are given using the RBS/channelling technique in this paper. It is found that the depth of peaks of displacement In or P atom profiles increases with increase of ion dose. With the same dose the depth of peak of displacement P atom profile is greater than that of displacement In atom profile. According to the relation of the movement of peaks and the broadening of profiles to dose, the reccil effects of displacement atoms are studied, and the mechanism of recoil effects is discussed.  
        关键词：Ion implantation;InP;Channelling technique;Displacement of lattice atoms;Recoil effect   
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        发布时间：2022-08-16
      • Chuanyuan Yin,Weizheng Xu,Qingchao Gu
        Vol. 13, Issue 6, (1990)
        摘要：The domain structure of segmented polyether polyurethaneureas is investigated by means of positron annihilation technique, small angle X-ray scattering and differential scanning calcrimetry. The experimental results show that the decrease of domain volume and free volume results from the increase of hard segment contents, and that the increase of domain volume and free volume results from the increase of molecular weight of soft segments.  
        关键词：Positron annihilation;Small angle X-ray scattering;Segmented polyether polyurethaneurea;Domain structure;Glass transition temperature   
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        发布时间：2022-08-16
      • Qifen Ling,Yunian Wei
        Vol. 13, Issue 6, (1990)
        摘要：The anisotropy constant of nonstoichiometric iron oxide powder has been studied by Mössbuer spectroscopy. The diameter of the powder was about 10 nm. At room temperature, the area ratio of the paramagnetic fraction to the ferromagnetic fraction of Mössbauer spectra before and after aging treatment was almost unchanged, but the quadrupole value was drastically changed, which suggested that the anomalous increasing of coercivity in nonstoichiometric powder should be due to the additional anisotropy induced by lattice distortion after partial oxidation of samples.  
        关键词：Nonstoichiometric;Magnetic anisotropy;Coercivity;Aging treatment   
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        发布时间：2022-08-16
      • Peilu Wang,Ping Zhou,Zhongyang Liu,Jingyun Jiang,Kelu Feng
        Vol. 13, Issue 6, (1990)
        摘要：Ion implantation causes an increase of electrical conductivity of the Q thin films by 8 orders of magnitude and the saturated value is about 2×10-3 (Ωcm)-1. The conductivity is very stable under exposure to ambient conditions. XPS analysis has shown a notable increase of carbon concentration an obvious decrease of oxygen concentration and a change of the pristine structure in the implahted zone. The results indicate that structure change is a main reason for the increase of electrical conductivity.  
        关键词：Ion implantation;Polymer;Electrical conductivity   
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        发布时间：2022-08-16
      • Weihua Zhang,Gang Li
        Vol. 13, Issue 6, (1990)
        摘要：The instrumental neutron activation analysis at MNSR reactor was used for determination of 10 rare earth elements in geological samples. Considerations were given to those systematic errors resulting from selfshielding effects, uranium-fisson interference, as well as disturbances from fast neutron reactions (n, p) and (n, α) . The measurement conditions and detection limits for other four REEs were also indicated.  
        关键词：Miniature neutron source reactor (MNSR);Rare earth element (REE);Neutron activation analysis   
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        发布时间：2022-08-16
      • Shouzao Gui,Qianmei Ji
        Vol. 13, Issue 6, (1990)
        摘要：A new 42Ar-42K isotope generator developed by Technical University of Munich is r commended. The method of preparing 42Ar isotope with triton beam, the decay property of 42Ar-42K and its advantages in application are presented. The principle of physical separation of 42Ar-42K and the generator device are also described. By using 42K isotope as a tracer, the transportation process of potassium from albumen into subgerminal fluid in quail eggs was investigated.  
        关键词：42Ar-42K cow;Tracer   
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        发布时间：2022-08-16
      • Wenqiang Jiao,Weitian Nie
        Vol. 13, Issue 6, (1990)
        摘要：Improving the vial quality is one of the effective ways for increasing the sensibility of liquid scintillation counting. Based on careful design and precision processing, the amount of volatilized cocktail in a counting vial can be less than 0.5mg/week. The result indicates that the best thickness of vial-wall is about 1—1.5mm. Measurements of characteristics are made for teflon counting vials with metal shield and different volumes, vials with metal surface blacked or polished, and vials from LKB Company. The results are compared and discussed.  
        关键词：Counting vial;Teflon;Volatility   
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        发布时间：2022-08-16
      • Ye Zhang,Tingzhou Xie,Sichun Zhou,Liangquan Ge,Wanchang Lai,Tianyou Chen,Zhengguo Fan
        Vol. 13, Issue 6, (1990)
        摘要：Nuclear geophysical X-ray fluorescence method can be used to look for and prospect hidden gold deposits. This can be done in-situ by means of measuring X-ray fluorescent intensities of the indicator elements of gold in soil or on outcrop with a portable X-ray fluorescence analyzer.In order to look for gold, a micro-processor based on a 400 channel X-ray fluorescence analyzer and a special filter have been designed and manufactured.  
        关键词：Filter;X-ray fluorescence analyzer;Gold deposits   
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        发布时间：2022-08-16
      • Junfa Qin,Yongxian Wang,Zhifen Hua,Beilian Lu
        Vol. 13, Issue 6, (1990)
        摘要：The Ca, Mn, Fe, Cu, Zn, Pb and Sr contents in hair of the aged people over 80 years old have been determined by using Pu-238 source activated X-ray fluorescence analysis method (XRF) . The results indicated that the contents of Fe, Pb, and Zn in hair increased with age, and that the ratio of Cu/Fe, Pb, which might be useful in estimating aging process, decreased with age. The clinical significance of these elements were discussed.  
        关键词：Hair trace element spectrum;X-ray fluorescence analysis;Cu;Fe;Pb;Aging   
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        发布时间：2022-08-16
      • Shoupeng Zhu,Genfa Cao,Baofu Sun,Xiuying Zhao
        Vol. 13, Issue 6, (1990)
        摘要：This paper describes the correlation between the retention of 152Eu and its radiation induced chromosome aberrations on bone marrow cells. The results indicated that 152Eu was largely localized in bone, and then in kidney, liver, lung and blood. When fission product 152Eu was selectively accumulated in bone, it caused chromosome aberrations on bone marrow cells. The chromosome aberrations were increased with uptake of 152Eu radioactivity. Among the types of chromosome aberrations induced by 152Eu, chromatid breakage was predominant. Two chromatid breakages in one cell were observed.  
        关键词：Fission prcduct;152Eu;Retention;bone marrow cells;Chromosome aberrations   
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        发布时间：2022-08-16
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