最新刊期
      卷 0 ， 期 0 ， 2020
      • ZHANG Chunxiang CHEN Lixin TANG Qiang LUO Daling
        Issue 1, (2001)
        摘要：Emission spectra of phosphor MgSO 4 doped with Dy and Dy/Mn were measured with an optical multichannel analyzer and a linear heating system whose temperature was controlled by a microcomputer. The emission spectrum bands at 480 nm and 580 nm of phosphor MgSO 4 doped with Dy were observed in the three dimensional (3D) glow curves. Compared with the 3D spectrum of CaSO 4:Dy and the spectrum bands of MgSO 4:Dy shows the same wavelengths which resulted from the quantum transitions among the energy levels of Dy 3+ ions. The intensities of the glow peaks in both spectrum bands (480nm and 580nm) of phosphor MgSO 4 doped with Dy/Mn were dramatically reduced except the 380℃ glow peak.  
        关键词：MgSO 4:Dy/Mn;Phosphors;Emission spectra   
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        发布时间：2021-03-12
      • LIU Changlong JIN Yunfan SUN Youmei ZHU Zhiyong HOU Mingdong WANG Zhiguang ZHANG Chonghong CHEN Xiaoxi WANG Yanbin LIU Jie LI Baoquan
        Issue 1, (2001)
        摘要：Semicrystalline polyethylene terephthalate (PET) films were irradiated with 35MeV/u Ar ions at room temperature. The ion beam induced surface modifications were studied by means of Fourier-transfer infrared spectroscopy in reflective mode as a function of the absorbed dose. Amorphization was evidenced by the decay of the bands related to the crystalline regions and the increase of the bands assigned to the amorphous regions in PET. Chain scissions were observed at the para position of benzene rings and C—O bond of ester. The benzene ring structures exhibited only small change during irradiation. These effects were found to depend on both ion fluence and the electronic energy loss near the sample surface. The creation of alkyne groups was found only at the absorbed dose higher than 5.0MGy, and its concentration increase with the increased of the absorbed dose. The results were qualitatively discussed.  
        关键词：Ar ion irradiation;PET;Amorphization;Chain scission;Absorbed dose   
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        发布时间：2021-03-12
      • ZHANG Zhiping LIU Shengkang ZHANG Yongji
        Issue 1, (2001)
        摘要：The theoretical calculation and experimental study on the moisture disturbance in the boron content measurement of wet glass fibre materials using the thermal neutron transmission method were reported. The relevant formula of the moisture disturbance was derived. For samples with a mass of 16g, it was found that a moisture varietion of 1% (mass percent) would result in a deviation of 0.28% (mass percent) in the measurement of boron contents.  
        关键词：Thermal neutron transmission method;Glass fibre;Boron content;Moisture disturbance   
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        发布时间：2021-03-12
      • SHI Hairong LIN Jun WU Dongmin XIAO Yuming HUANG Hongbo LI Shimin XIA Yuanfu
        Issue 1, (2001)
        摘要：Usually, for Mssbauer mirror spectra folding procedure is an effective way to eliminate the geometric effect of the base line, and to raise the data acquisition efficiency. Folding is often proceeded by taking the center of mirror spectra as folding point, but a disadvantage of obvious line-broadening, resulted by the fact that the Doppler velocity lags behind the drive signal is usually overlooked. In this paper, a new approach was developed, which could avoid the above problem.  
        关键词：Mssbauer spectra;Mirror folding;Mssbauer effect methodology   
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        发布时间：2021-03-12
      • TANG Yu WU Xiaoyi YIN Zejie
        Issue 1, (2001)
        摘要：This article analyzed the distribution of radiation dosage density in water ball, the size of malignent region and the character isties of radiation source were concerned as main factors. All works were based on the numeric simulation by GEANT3 system.  
        关键词：GEANT3;Water ball;Focus;Distribution of radiation dosage density   
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        发布时间：2021-03-12
      • ZHU Xiaopeng LEI Mingkai MA Tengcai
        Issue 1, (2001)
        摘要：A γ-TiAl intermetallic compound was implanted with Cr, Y and Nb ions respectively to a dose of 1×10 17 cm -2 at an ion energy of 50-60keV by using a MEVVA ion source. Cyclic oxidation tests were performed on this compound at an oxidation temperature of 1000℃ in air. It was found that Cr or Y ion implantation slightly affects the oxidation behavior of γ-TiAl at 1000 ℃ during the whole testing period up to 200h. The Nb ion implantation significantly improved the oxidation resistance of γ-TiAl in the initial stage of oxidation, but this improvement gradually decreased when the oxidation time was increased to more than 100h. By adding the same element, alloying and ion implantation have different effects on the oxidation resistance of γ-TiAl due to different characteristics resulted from these two processes. The modified surface of γ-TiAl by ion implantation has limited effects on improving its oxidation resistance during long term at high temperatures.  
        关键词：Ion implantation;Intermetallic compound;High-temperature oxidation   
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        发布时间：2021-03-12
      • LI Yongliang LI Weichao ZHOU Gu
        Issue 1, (2001)
        摘要：H13 steel samples were implanted with C+Ti dual ions. The electrochemical polarization measurements showed that the C+Ti dual ion implantation could improve H13 steel’s corrosion resistance properties. The degree of improvement increased with the increasing Ti ion implantion doses. The pitting corrosion experiments showed that the dual ion implantation could also improve H13 steel’s pitting corrosion resistance. The TEM and SEM tests confirmed that a micrograin layer was produced on the surface, so the nucleus-formation spots of corrosion were decreased,and the corrosion resistance improved after the C+Ti ion implantation.  
        关键词：C+Ti dual ion implantation;Corrosion resistance;Surface modification;Corrosion pit   
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        发布时间：2021-03-12
      • SHI Weidong ZHONG Fu LIU Zhenmin MA Yonghui
        Issue 1, (2001)
        摘要：The article described the structure,principleed and function of a multi-element gas and metal pulse ion source, and demonstrated the regulating index and characteristics of the source.  
        关键词：Ion source;Pulse;Metal vacuum arc   
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        发布时间：2021-03-12
      • DING Junzhang ZHAO Yubin LIU Zhanweng ZHAO Haowei YUAN Ping CAO Yun LEI Hailiang ZHANG Zimin ZHANG Xuezhen ZHANG Wen GUO Xiaohong WANG Hui FENG Yucheng LI Jinyu MA Baohua GAO Jiyuan SONG Pei LI Xixia (Institute of Modern Physi
        Issue 1, (2001)
        摘要：A 2.45GHz single charge state ECR ion source with permanent magnet has been developed at IMP. The physical principle and structure are presented, and the microwave system and magnetic configuration are introduced in this paper. A mixed ion (H 1 ++H 2 ++H 3 +) beam current of 90mA can be delivered from a single aperture of  6mm with microwave power of 600W at extraction voltage of 22kV.  
        关键词：ECR ion source;Microwave;Plasma frequency;Permanent magnet   
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        发布时间：2021-03-12
      • SUN Baogen HE Duohui GAO Yunfeng XU Hongliang HU Shouming WANG Junhua LU Ping
        Issue 1, (2001)
        摘要：The tune measurement system for Hefei Light Source (HLS) was described. The system composed of a stripline beam position monitor, a 180 0 hybrid, a mixer, a spectrum analyzer with track generator, a power amplifier, and an excitation electrode. The swept frequency excitation method was used to measure the tune. Its accuracy was about 4×10 -4 . The chromaticity of HLS was measured using this system. The measuring results of the tune and chromaticity were given.  
        关键词：Tune;Betatron motion;Swept frequency excitation;Beam frequency spectrum;Chromaticity   
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        发布时间：2021-03-12
      • SUN Zhiming CHEN Chuanqun WANG Shouxiang
        Issue 1, (2001)
        摘要：Studies on the dynamics of transportation, accumulation, disappearance and distribution of 60 Co in the wheat-soil system were accomplished. It was shown that 60 Co was transported rapidly in the system after it was put into the surface layer of soil. The specific activity of 60 Co in wheat plant rapidly increased to a maximum value, then decreased. The specific activity of 60 Co in each part of wheat plant was found to be arranged in order of root 》 straw 》 husk > seed. 60 Co is mainly detained in 5cm of soil surface,and specific activity of 60 Co in soil present an individual exponential declining with depth of soil. The wheat plant has some ability to accumulate 60 Co in soil.  
        关键词：Co;Wheat;Transference;Compartment model   
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        发布时间：2021-03-12
      • LI Zhihuai ZHANG Yingji XU Hongjie
        Issue 1, (2001)
        摘要：The bending methods for elliptic and parabolic figure with variable-width mirror were discussed and the formula of variable-width for ladder-shaped mirrors was given. The rectangular and ladder-shaped mirrors were elliptically bent. The bending formula was modified by comparing measured result with calculated one.  
        关键词：Synchrotron radiation;Bent mirror;Mirror figure   
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        发布时间：2021-03-12
      • PENG Liangqiang JU Xin WANG Shicheng XIAN Dingchang
        Issue 1, (2001)
        摘要：An analysis of asymmetric etch demonstrated that the nuclear track membranes can be prepared with smaller pore size than that with the normal etch. The experiment showed that the pore size can be decreased to 1/2 of the normal size by this method. The analysis for an etch method with temperature gradient showed that the pore size decreased with the increasing temperature gradient and could decrease to one-fifth of the normal size under the practical conditions. The computer simulation showed that the nuclear track membranes could prepared with cylinder pore by this method but it was difficult to control the etching process.  
        关键词：Nuclear track membranes;Etch   
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        发布时间：2021-03-12
      • ZHANG Yuanxun WANG Yinsong QIAN Yine TAN Mingguang SHEN Weiguo ZHI Ming LI Deyi CHENG Feng ZHANG Guilin
        Issue 1, (2001)
        摘要：The program of the Shanghai Environmental Specimen Bank (SESB) has been developed recently and its current status was briefly described. Typical specimen such as water and sediment of Suzhou river, city dust were collected and some analysis results obtained since 1998 were presented. Moreover, relating aspects of environmental data evaluation and assessment were discussed.  
        关键词：Specimen bank;Environment;Ecology   
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        发布时间：2021-03-12
      • WANG Naxiu ZHOU Weinan
        Issue 1, (2001)
        摘要：The chemical procedure for preparing Al 2O 3 sample used in AMS was reported. The fact that different ions are precipitated at different pH values was used to purify Al which was coverted to Al 2O 3 at high tempareture. A set of Al 2O 3 samples including standard and blank have been prepared. For the blank the ratio 26 Al/ 27 Al was measured to be 1.1×10 -13 . The result showed that the interference of 26 Mg in sample was negligible and the chemical procedure of preparing Al 2O 3 samples were successful. The measurement procedure of 26 Al by AMS was also reported.  
        关键词：Accelerator mass spectrometry (AMS);26 Al;Al 2O 3   
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        发布时间：2021-03-12
      • LI Qingnuan 1 ZHANG Xiuaodong 1 SHENG Rong 2 LI Wenxin 1 1
        Issue 1, (2001)
        摘要：A rhenium-AEDP(1-amino-ethylene diphosphonic acid) compound was synthesized by using 188 Re eluted from the 188 W/ 188 Re generator. Stannous chloride was used as the reducing agent for the reduction of the rhenium. Dependence of the labeling yield of 188 Re-AEDP upon concentrations of reducing agent and AEDP, pH and the carrier added was examined. Under optimum conditions, the labeling yields of 188 Re-AEDP were 90%—93% using carrier-free 188 Re and 95%—98% using carrier-added 188 Re respectively. The stability of 188 Re-AEDP at pH≈6 was studied. It was found that carrier had significant effect on the stability of 188 Re-AEDP.  
        关键词：Re-AEDP;Carrier;Stability   
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        发布时间：2021-03-12
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