最新刊期
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      • Meizhen Wu,Guoqing Xiao,Shufen Wang,Qiang Zhang,Xiaoxi Chen,Mingdong Hou,Zhishen Tong
        Vol. 13, Issue 5, (1990)
        摘要：The variations of wearability and microhardness have been investigated for GCr15 steel after implantation with 100 keV N+. The composition and phases in the implanted layer were analyzed with AES, CEMS and XRD methods. The experimental results indicated that non-magnetic phases ξ-Fe2N and ε-Fe2+x (C,N) could essentiallly enhance the wearing resistance. To get a satisfactory wearing resistance, a dose of 5×1017N+/cm2 is necessary.  
        关键词：GCr15 bearing steel;AES;CEMS;ξ-Fe2N;ε-carbonitrides MS parameter   
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        发布时间：2022-08-16
      • Zhongquan Ma,Jiarui Liu,Shusheng Zhang
        Vol. 13, Issue 5, (1990)
        摘要：The nuclear resonance reaction 27Al (p,γ) 28Si at Ep=774 and 992 keV was used for studying the solid structure effect of energy loss for proton in SOS sample systematically. The experiment was carried out upon the 2×1.7MV accelerator of Institute of Physics and the measuring error was less than 3%. The experimental result showed that the differences of electronic stopping power values for proton in three solid states was more than 5%.  
        关键词：Nuclear resonance reaction 27Al (p,γ) 28Si;SOS sample Electronic stopping power;Allotropic effect   
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        发布时间：2022-08-16
      • Qingping Han,Weichang Lu,Huijuan Su,Jinbo Hu,Liqin Zhang,Banglin Chen
        Vol. 13, Issue 5, (1990)
        摘要：In this paper the adsorption process of uranium by Resin 508 at the solid-liquid interface was investigated and the mechanism of uranium adsorption including adsorption dynamics, adsorption thermodynamics and isoelectric point of resin was studied. The results are as follows: The maximum of uranium adsorption is attained at pH5-7;Uranium adsorption isotherm by Resin 508 in experimental conditions agrees with Langmuir's adsorption isotherm, the maximum of uranium adsorbed (Vm) is 716 mgU/g-dried resin; The adsorption of uranium by Resin 508 is an endothermic reaction and ΔH=16.87kJ/mol; The exchange-adsorption rate is mainly controlled by liquid film diffusion; The isoelectric points of Resin 508 before and after uranium adsorption are found to be pH 7.5 and pH 5.7 respectively. It is a specific adsorption for uranium.  
        关键词：Resin 508;Uranium;Mechanism of adsorption;Isoelectric pcint   
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        发布时间：2022-08-16
      • Zhongying Li,Haiqian Zhang
        Vol. 13, Issue 5, (1990)
        摘要：This paper describes the principle and technology of absolute determination of electron absorbed dose by an extrapolation chamber. The absorbed dose, its distributions in depth and along scanning direction and practical ranges in several materials for electron beams of the J-2.5 MV Van de Graaff accelerator, were measured. The estimated uncertainty of the absorbed dose in medium m was 1.7%, falling in the range reported by similar works of the world.  
        关键词：Extrapalation chamber;Absorbed dose of electron beam;Dose distribution in depth;Practical range   
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        发布时间：2022-08-16
      • Hanru Shao,P. Auric
        Vol. 13, Issue 5, (1990)
        摘要：A depth sensitive conversion electron Mössbauer spectrometer based on a gas-flow proportional counter with single anode wire was presented. The depth selection was made by recording the conversion electron Mössbauer spectra in different energy regions. From the measurement for a stainless steel surface on which a 50nm α-Fe layer was vacuum-evaporated it was observed that the α-Fe to stainless steel areal ratio was obviously different in the Mössbauer spectra for the energy range of 0.9—2.5,3—8, 6.8—7.5 and 11—16 keV respectively. This implies that these spectra represent the information from the different depths of sample surface. This type of spectrometer has the advantages of simplicity, high geometrical efficiency and simultanecus acquisition of information from several different depths.  
        关键词：Conversion electron Mössbauer spectrometer;Depth sensitive;Proportional counter   
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        发布时间：2022-08-16
      • Yuesheng Chao,Liangyue Xiong,Pingping Zhang,Jie Zhu,Shouguo Zhang
        Vol. 13, Issue 5, (1990)
        摘要：The lineshape parameter S (S-parameter) in Doppler broadening spectra of positron annihilation and specific resistance have been measured at room temperature for three amorphous alloys (Fe75Si10B15, Fe73Si9.5B17.5 and Fe71Si14B15) after annealing at temperatures in the range of 20-625℃. The experimental results show that the variations of both S-parameter and specific resistance with annealing temperature are non-monotonous. Moreover, the difference of S-parameters between as-quenched sample and crystallized one is about 2%, which suggests that structure of the three amorphous alloys accord with the dense random packing structure of hard spheres rather than the microcrystal model.  
        关键词：Structural model of amorphous alloys;Lineshape S-parameter in Doppler;broadening spectrum of positron annihilation;Specific resistance;Dense random packing structure of hard spheres (DRPHS)   
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        发布时间：2022-08-16
      • Anquan Le,Yingmei Gu,Lianxue Gu
        Vol. 13, Issue 5, (1990)
        摘要：The principle and structure of a composition analyzer are described. It can measure the percentage contents of copper and zinc n brass coatings (with thickness of 3-5µm) covered on iron or nickel parts with accuracy better than 0.6%. The results can be displayed on screen or printed on paper.  
        关键词：Brass coating;XRF;microcomputer   
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        发布时间：2022-08-16
      • Enteng Zou,Zhifen Chen
        Vol. 13, Issue 5, (1990)
        摘要：The measuring system contains a portable XRF analyzer based on a microprocessor and an automatic scanning installation. It can be used to directly determine the Mo content in bore meal cut by a gear wheel borer in an open molybdenum mine.  
        关键词：XRF analysis of heterogeneous samples;Analysis of bore meal;Molybdenum   
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        发布时间：2022-08-16
      • Siyun Bi,Yuelu Zhang,Liangmo Mei
        Vol. 13, Issue 5, (1990)
        摘要：The transformation of crystalline Fe films to amorphous alloy by implanting B+ ions was studied by using the technique of conversion electron Mössbauer spectroscopy. The analysis of fraction of amorphous phase and its hf parameters as functions of B+ion dose and the phases formed after crystallization gives a new sight of the amorphization mechanism.  
        关键词：CEMS;Amorphization;Ion implantation   
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        发布时间：2022-08-16
      • Mingqian Wang,Xin Ju,Lizhen Zheng
        Vol. 13, Issue 5, (1990)
        摘要：This paper presents a method to obtain, by using filtration, an X-radiation source with a group of narrower energy-spectral distributicn ranging fron 55 to 150keV. The radiation source can be vsed to calibrate the instruments for radiation detection. Together with a K-fluorescent X-ray source and reference γ-ray sources such as 51Cr, 137Cs, 60Co etc., it is a useful tool for detailed studies of the energy response of some dosimeters.  
        关键词：Radiation source;Spectral distribution;Dosimeter;Energy response   
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        发布时间：2022-08-16
      • Shu Xu,Chibing Hu
        Vol. 13, Issue 5, (1990)
        摘要：On the basis of the ordinary "β-γ synthetical method" and by application of a new principle, this paper describes a direct determination method for uranium content according to β- and γ-ray intensities.  
        关键词：Radioactive analysis;Uraium content;Disequilibrated uranium ore;β-γ synthetical method;Direct analytical metho   
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        发布时间：2022-08-16
      • Yin Sha,Pingsheng Liu,Guodong Liu,Han Lin,Wenzheng Lan,Genyuan Ji,Xiaoheng Wen,Shusheng Ma
        Vol. 13, Issue 5, (1990)
        摘要：The radii of rabbits were fractured by operation and the contents of P, S, K, Ca, Fe, Ni, Cu and Zn in whole blood were determined by PIXE for seven weeks after fracture. The content of Ca kept nearly constant during healing, which showed that it might not be proper to give the patients with fracture a large amount of calcium. The notable variation of Cu content in the seven weeks revealed that copper was one of the most active elements, which provided a scientific basis for the traditional Chinese prescriptions including "native copper" for healing fracture.  
        关键词：Proton induced X-ray emission (PIXE);Fracture of rabbits;Whole blood;Elemental metabolism   
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        发布时间：2022-08-16
      • Hongshou Zhang,Shusong Yang,Jinxian Ni,Wenying Cheng,Zhisheng Ding
        Vol. 13, Issue 5, (1990)
        摘要：After administrating large deses of CTx (30-50mg/kg×2d) combined with 60Co total body irradiation (4—6Gy) or total lymphonode irradiation (5.01—9.96Gy), moderate to severe acute radiation sickness induced as treated with fetal liver transplantation combined fractional transfusion (suspension of white blood cell or blood platelet cell) and antibiotics application. Quite good results were obtained. It would be served as a potential method for emergency treatment after a nuclear accident.  
        关键词：Fetal liver transplantation;Moderate and severe acute radiation sickness;Total body irradiation;Total lymphonode irradiation   
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        发布时间：2022-08-16
      • Bo Xu,Qixun Sun,Nianbao Zhang,Binghua Xie,Jiong Zhang
        Vol. 13, Issue 5, (1990)
        摘要：Liposome vesicles containing antitumor drug methotrexate (MTX) were prepared. MTX was labelled by the tritium ion beam method. After purification by TLC, the specific radioactivity of 3H-MTX was 1.19GBq/mmol with radiochemical purity over 95%. Under various forming conditions of liposome vesicles, the efficiency of encapsulation was 21-53%.  
        关键词：Antitumor drug;3H-MTX;Tritium ion beam labelling method;Liposome vesicles   
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        发布时间：2022-08-16
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