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      • Weifang Wu,Shi Li,Yinhua Li
        Vol. 13, Issue 9, (1990)
        摘要：The preparation of Mg3TeO6 as an iodine Mössbauer source is described, It has a high melting point(1420℃) and a high Debye temperature(320K). Te in the compouud is in the from of Te+6 ion, with a structure having high coordination number and perfect cubic symmetry. As a substitute for ZnTe and SnTe sources, this source might be used for the Mössbauer measurements at room temperature. The preparation methods of Mg3TeO6 have the advantage of simplicity and do not need any after-treatment. The quality of Mg3TeO6 has been determined by X-diffraction, differential thermal and neutron activation analysis. The results show that Mg3TeO6 is an ideal material as a Mössbauer iodine source.  
        关键词：Mossbauer source;Recoilless fraction;Debye temperature;X-diffraction analysis;Differential thermal analysis;Neutron activation analysis   
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        发布时间：2022-08-16
      • Zhengmin Liu,Kunshan Yang,Huazhong Yang,Yuanxun Qiu
        Vol. 13, Issue 9, (1990)
        摘要：The fast heavy ion beam enhanced adhesion of thin Cu film on Si substrate was studied for a wide range of Cl ion beam doses and for beam energies of 2.0,3.0 and 4.0 MeV. It is found that there are two types of enhanced adhesion. The surfaces of Si substrates were observed by means of a scanning electron microscope (SEM) after low dose ion bombardment. The micrographs show that no microcracks exist on the surfaces. This result seems to disagree with the explanation of low dose enhanced adhesion caused by the crazes on the substrate surface.  
        关键词：Enhanced adhesion;Threshold;Microcrack   
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        发布时间：2022-08-16
      • Tonghe Zhang,Guohui Li,Yan Luo,Yuguang Wu,Fengzhang Yan,Wenxun Wang,Lingyu He
        Vol. 13, Issue 9, (1990)
        摘要：The RTA properties of As implanted into Si and implanted through a SiO2 film into Si are studied. The fabrication of PN junction with a depth of 0.1-0.6µm has been optimized. The processes of lattice restoration and defect density change during RTA are observed by TEM. It is found that if longer annealing time and hot target implantation are used the residual defect density can be reduced greatly. The results show that diffusion coefficient is increased with increasing of ion flux. The relation of diffusion coefficient with annealing and implantation conditions are given. The influences of the above mentioned conditions on leakage current of PN junction have been studied. The conditions for making PN junction located out of the radiation damaged region have been discussed.  
        关键词：Ion implantation;Rapid thermal annealing;Enhanced diffusion;Shallow PN junction technology   
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        发布时间：2022-08-16
      • Guangyong Qin,Zhengyao Gao,Xianjia Pan,Zhiting Yao
        Vol. 13, Issue 9, (1990)
        摘要：Lishan clay has been characterized by Mössbauer spectroscopy, X-ray diffraction, X-ray fluorescence, neutron activation, thermal and chemical analyses. It was proved that Lishan clay was the material used for making the terra-cotta warriors and horses of Qin Dynasty. Firing testing of clay was carried out in various conditions. The transformations induced by firing of clay were characterized by Mössbauer spectra. The data on quadrupole splittings of Fe3+ or Fe2+ ions, and on nonmagnetic component distributions at different firing temperatures, may lead to valuable informations on the manufacture of ancient pottery. The sintering temperture for the terra-cotta warriors and horses of Qin Dynasty was thus evaluated to be 950—1030℃.  
        关键词：Mossbauer spectroscopy;Lishan clay;Firing test in oxidizing and reducing atmosphere;Terracotta warrior and horses of Qin Dynasty;Firing temperature   
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        发布时间：2022-08-16
      • Xuezhi Wang,Quanbu Gou
        Vol. 13, Issue 9, (1990)
        摘要：In this paper is introduced a 45°-deflection semiconductor coincidence telescope for neutron yield absolute measurement in a 3.3×1012n/s neutron generator. For neutron yields of 2 × 1010-3×1012n/s, the intercomparison measurements have been made with a 238U fission chamber and the two methods gave identical results within an error of 4.5%.  
        关键词：45°-deflection telescope;Neutron generator;High speed rotating target   
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        发布时间：2022-08-16
      • Bingxin Yang,Kezun Xu,Fang Zhang,Yan Zhao,Luhua Cheng,Xuegong Liu,Guangwen Yan,Ruiqi He
        Vol. 13, Issue 9, (1990)
        摘要：The hair trace element contents for patients, in Hefei district Anhui Province, suffering from hyperthyroidism, ureter stone and chronic livercomplaint, were measured by XRF method and controlled by healthy people. The correlation of trace elements was studied. The criterion of diseases based on the contents of hair trace elements was preliminarily studied using polybasic regression calculation with satisfactory results.  
        关键词：XRF method;Trace element;Correlation;Polybasic regression;Criterion of diseases   
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        发布时间：2022-08-16
      • Peilu Wang,Jingyun Jiang,Zhongyang Liu,Jie Weng
        Vol. 13, Issue 9, (1990)
        摘要：A Ta-GCr15 amorphous film on the GCr15 steel matrix has directly been formed by ion beam twice mixing and it has been identified by TEM observation. The relation between amorphous phase transition and ion dose has been observed. Physical properties of the amorphous film have been examined by the measurements of microhardness and fraction coefficient, and by the abiasive wear test. The electrochemical behaviors have been evaluated by anodic polarization experiments. It is shown that physicochemical properties of the GCr15 steel surface have been improved significantly due to the formation of the Ta-GCr15 amorphous film.  
        关键词：Ion beam mixing;Amorphous alloy;Friction;Wear;Corrosion   
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        发布时间：2022-08-16
      • Qi Ao,Liguo Cao,Yimin Ding
        Vol. 13, Issue 9, (1990)
        摘要：The relationship between the ratio of gamma-ray Rayleigh to Compton backscattering intensities (R/C) and the weight fraction of heavy element in light matrixes were investigated. An improved(R/C)eff analytical technique for tin-ore samples was described. The technique can be regarded as a substitute for the XRF method where the self-absorption process worsens the analytical accuracy of heavy elements.  
        关键词：Ratio of Rayleigh to Compton backscattering;XRF;Tin ore;Heavy element;Isotope source   
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        发布时间：2022-08-16
      • Guirong He,Zeyuan Jin,Yiping Qing
        Vol. 13, Issue 9, (1990)
        摘要：A rapid method for determination of calorific values of coal was presented in this paper. The spectra of neutron-induced prompt gamma rays from coal were measured. The contents, Cy, of carbon are determined from intensities of the characteristie rays, and calorific values, , of coal were deduced from Cy. The uncertainties of Cy and measured were less than 2% and 1.25kJ/g respectively. It took only a few minutes for measurement of one sample.  
        关键词：Prompt gamma;On-line analysis;Coal;Calorific value   
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        发布时间：2022-08-16
      • Shugang Sheng,Rongzhen Cao
        Vol. 13, Issue 9, (1990)
        摘要：A new apparatus suitable to the advanced tritium ion beam labelling technique is presented. It consists of a vacuum chamber, an ion source, a sample target seat, a pumping system and a gas supply unit. A movable cooling sample plate which is meticulously designed is an original part of this apparatus. The new labelling technique has advantages of reserving fully biological activity and requiring relatively short reaction time. It has been used to tritiate enkephalin, pachyman and other nonvolatile organic compounds with good results.  
        关键词：Tritium ion;Ion source;Labelling technique;Proteins;Peptides   
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        发布时间：2022-08-16
      • Yuexing Wang,Xiaolin Ma,Yongjie Lu,Changquan Yun,Fuqiang Su
        Vol. 13, Issue 9, (1990)
        摘要：This paper describes a tissue simulated material, which is composed of wax and carbon, sulphur and cork powders, with effective atomic number(Ze) of 7.51, electron density (ρe) of 3.34×1023 e/g and density (ρ) of 1.003 g/cm3. These parameters are essentially in agreement with those of muscle tissue. It can also be used as an approprite substitute for water in some radiation studies.  
        关键词：γ Photon;Tissue simulated material;Effective atomic number   
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        发布时间：2022-08-16
      • Xiaolin Ma,Yuexing Wang,Changquan Yun,Yongjie Lu,Fuqiang Su
        Vol. 13, Issue 9, (1990)
        摘要：The quick estimation of personal dose from γ-ray external irradiation by phantom experiments was reported. The ratios DROP and DROT in different exposure conditions were given. In addition, three expressions for accident doses were compared. The application of the methods estimating external accident doses was also discussed.  
        关键词：Nonuniform external irradiation;Effective dose equivalent;Organ dose;Phantom   
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        发布时间：2022-08-16
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