最新刊期
      卷 0 ， 期 0 ， 2020
      • HONG Xinguo1 INUI Masanori2 TAMURA Kozaburo3 1
        Issue 3, (2003)
        摘要：With the volume expansion by heating up toward the critical point, typical liquid metal mercury undergoes metal-nonmetal transition (M-NM) at a density around 9 g/cm3. To study the structure changes of fluid Hg during volume expansion, we have carried out X-ray diffraction measurements for expanded fluid mercury in a wide density region from liquid to dense vapour region using synchrotron radiation at SPring-8. We have succeeded in developing a new high-pressure vessel, up to 1700C under 2000 bar and with 7 scattering windows for energy-dispersive X-ray diffraction (EDXD) measurements under high temperature and high pressure. It was found that the reliability of the structure factors, S(k), and the accuracy of the pair distribution functions, g(r), are much better. Reliable relations of the coordination number and the correlation distance with the density of fluid Hg were obtained. Structural model of volume expansion of fluid Hg is proposed based on our new results. Structural changes with decreasing density are discussed in relation to the M-NM transition in fluid Hg.  
        关键词：Synchrotron radiation;X-ray diffraction;Liquid metal;Critical phenomenen;Metal-nonmetal transition   
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        发布时间：2021-03-12
      • XIONG Shenshou TAN Yinglei
        Issue 3, (2003)
        摘要：This paper describes the design, configuration, function and operating regulation of the radiation safety interlock system for the beam line 3W1A and its experimental station. In addition, the real-time display units for synchrotron radiation operation status, and e- - injection automatic alarm & voice units for the operation of the BEPC storage ring and LINAC were also built for the two Experimental Halls at BSRF (Beijing Synchrotron Radiation Facility). The systems provide reliable personnel safety protection for the experimenters and users.  
          
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        发布时间：2021-03-12
      • YU Wanli1 TIAN Yulian2 1
        Issue 3, (2003)
        摘要：Calculating the direction of crystal defects is an essential task in the crystal research. Some previously used methods need monochromatic X-ray radiation, and the crystal orientation should be adjusted precisely. The authors proposed a new method not long ago, in which white synchrotron radiation was used instead of the monochromatic radiation and the crystal orientation needn抰 to be adjusted. The calculating method is introduced in detail and the calculation error is estimated.  
        关键词：Crystal defect;Orientation;Synchrotron radiation   
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        发布时间：2021-03-12
      • PENG Tao GU Chenglin
        Issue 3, (2003)
        摘要：Developments of pulsed magnetic fields in the world are reviewed in brief first, and some details dealing with the generating methods, developing level and problems existing in the magnetic field designs are discussed. Finally, a simple extension about its future developments is presented.  
        关键词：High magnetic field;Pulsed magnetic field;Magnets   
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        发布时间：2021-03-12
      • ZHU Nankang WANG Chunlei TENG Weifang
        Issue 3, (2003)
        摘要：This paper describes the features and status of radiation sterilization of medical devices in the world. The key points include establishment of modern commercial radiation company; establishment of dosimetry system; dose setting and auditing; validation of process; routine control; intranet management and product identification system; establishment of quality system; and radiation protection and safety. It is emphasized that the following should be paid great attention to in the near future: seizing opportunities for development; following the international level in construction of quality system; and establishing modern enterprise system.  
        关键词：Medical devices;Radiation sterilization   
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        发布时间：2021-03-12
      • WANG Junxin1,2 PENG Zicheng1,2 LIU Guijian1 Fang Minghui 1 Gui Herong1 1
        Issue 3, (2003)
        摘要：The K and Ca contents in the national standards of pellets (W7220, W7107), biotite (ZBH-25) and hornblende (ZBJ), as well as, the K and Ca isotopic ratios of the national K standard and an international standard (Tachiti) have been determined by using mass spectrometry and atomic absorption spectrometry . The measured results are in agreement with the standard values within a reasonable error range. On the basis of the standard measurement, the slope of the regressive line between (40K/42Ca) and (40Ca/42Ca) data is equal to 0.068730.01732, corresponding to the age of (133.532.1)Ma, which is consistent with the 132.7Ma in the error range reported by using the 40K-40Ar method. The primitive ratio (40Ca/42Ca)i deduced from the isochrone is 151.4160.003, corresponding to +26.5 of the xCa value. It means that the original rock of the biotite and hornblende minerals appears in the terrestrial behavior.  
          
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        发布时间：2021-03-12
      • SHI Jinshui1 LI Qin1 YU Haijun1 MA Bing1 LIN Yuzheng2 DING Bonan3 1
        Issue 3, (2003)
        摘要：This paper describes the precondition of transporting stably intense beams in an alternate focusing solenoid field and presents the method of confining corkscrew oscillations by the field. The results of numerical calculation show that the centroid transverse displacement is decreased from 5mm (at the outset) to approximate 0 (at the terminal) when the 0.81m alternating period and the 0.2T peak magnetic field are used and 11.2MeV beams are transported 2.5m. The experimental setup whose layout is similar to that of numerical calculation is established and the experimental results are almost in agreement with the results of numerical calculation.  
        关键词：Alternate solenoid field focusing;Stable solution;Corkscrew motion of beam centroid   
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        发布时间：2021-03-12
      • LU Rongrong QIU Huiyuan JIANG Da LI Xiaolin ZHU Jieqing
        Issue 3, (2003)
        摘要：The CVD diamond microdosimeter is an ideal substitute for common Si and GaAs detectors under extremely strong radiation experimental environment due to its high band gap energy, fast charge collection, low dielectric constant and high hardness. In order to improve its character, a CVD diamond microdosimeter was irradiated by protons of 46 Gy, and the lateral micro-ion beam induced charge (IBIC) technique was utilized to characterize it in low beam current (~fA). It was clearly shown that charge collection efficiency was greatly improved after proton irradiation with that dose. Moreover, the uniformities of both counting performance and collection efficiency were enhanced. Proton irradiation of 46 Gy has been proved to be an effective way to prime a CVD diamond.  
        关键词：CVD diamond microdosimeter;Collection efficiency;Lateral micro-ion beam induced charge   
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        发布时间：2021-03-12
      • LIN Qing1 LIU Xianghua2 ZHU Ming1 XIE xinyun1 LIN Chenglu1 1
        Issue 3, (2003)
        摘要：Buried layers were formed by N+(9?017/cm2) and O+(3.5?017/cm2) co-implantation into <100> silicon wafers at a temperature of 500―800oC. The implanted layers were analyzed by XTEM. To predict the quality of the buried layers, the computer simulation for the formation of SIMON structure was studied. We not only used IRIS software which developed from TRIM-94 but also revised the model of IRIS, which made it possible to simulate the process of implanting N+. The XTEM data were compared with the results of the computer simulation, and we found the two accord with each other.  
        关键词：Co-implantation;SIMON;SOI;IRIS   
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        发布时间：2021-03-12
      • YAN Sha LE Xiaoyun ZHAO Weijiang HAN Baoxi XIANG Wei WANG Yugang XUE Jianming
        Issue 3, (2003)
        摘要：The stress process samples undergo during the intense pulse ion beam (IPIB) irradiation and sequent fast cooling is one of the most important effects of IPIB. It can change the microstructure and microhardness of the samples. By comparing thermodynamic calculation with the experimental results of microhardness measurements for 45# steel samples and pure Al samples which are irradiated by IPIB at different energy fluence, we suppose that the generation, propagation and reflection of stress wave should account for the phenomenon of multi-maximum of microhardness. The experimental results also proved our deduction about the microhardness maximum appearing at a certain depth near the back side surface.  
        关键词：Intense pulsed ion beam;Metal;Stress;Stress wave   
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        发布时间：2021-03-12
      • WANG Dachun CHEN Jun LI Yude HE Yejun YAN Yiming
        Issue 3, (2003)
        摘要：By using monolithic parallel beam X-ray lens instead of the attachment slits or Soller slits, the X-ray intensities both incident on and diffracted from the sample can be 1.5—3.5 times than the original and a resolution of 0.4°can be reached, thus the diffractional setup with X-ray lenses can be used to analyse thin film, powder and ion beam deposit samples. By using the slightly focusing X-ray lens in the macromolecular crystallography, high pressure and four circle X-ray diffractometers and at the same electric power supply, the diffracted intensities can be raised 3—10 times than the traditional diffractional equipment. In addition the signal to noise ratio and the resolution can be improved to a certain extent.  
        关键词：X-ray diffraction;X-ray lens;Parallel beam   
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        发布时间：2021-03-12
      • WANG Youshao SUN Zongxun HE Lei
        Issue 3, (2003)
        摘要：N,N,N?N?Tetrahexylsuccinylamide(THSA) was synthesized, and used for extraction of HNO3, U(VI) and Th(IV) with THSA in n-dodecane. The HNO3·THSA was suggested as the main adduct in 1.0 mol·L-1 HNO3, and THSA·(HNO3)2 was also present except THSA·HNO3 in 3.7 mol·L-1 HNO3. According to the effects of nitric acid concentration, THSA concentration and temperature on distribution ratios of U(VI) and Th(IV), the compositions of UO2(NO3)2·THSA and Th(NO3)4·2THSA were obtained. The equilibrium constants and thermodynamic functions of extraction reactions have been calculated. The experimental results indicate that THSA can extracted U(VI) and Th(IV) efficiently and a better U-Th separation could be reached in the experimential region.  
          
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        发布时间：2021-03-12
      • HUANG Xuan1 LI Qingnuan1 LI Yuguo1 LIU Ruili1 ZHANG Xiaodong 1 WU Shiying1 Li Wenxin1,2 1
        Issue 3, (2003)
        摘要：TiO2 colloid has been prepared by hydrolysis of titanium tetrabutoxide, while composite nano-particles of Ag/TiO2 were synthesized by photoreaction. The effects of the concentrations of reaction, pH value and the addition of ethanol on the radiochemical yield were studied. Under the optimum conditions, the composite nano-particles of (110Agm) Ag/TiO2 were synthesized with radiochemical yield of 93.6% and specific volume radioactivity of 0.6MBq/mL. The stability of (110Agm)Ag/TiO2 at pH =6.7 showed that the radiochemical yield remained to be 93.0% after 48h. The size of TiO2 and Ag/TiO2 determined by AFM microscopy were 1~2nm and 15~40nm , respectively.  
        关键词：Agm;Titanium dioxide;Radioactive nano-particles   
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        发布时间：2021-03-12
      • FAN Wenling LU Xiaofeng
        Issue 3, (2003)
        摘要：Papers concerning the application of atomic force microscope (AFM) to the study of polymeric membranes were reviewed. AFM has been used to study such characteristics of membranes as pore size, pore size distribution, pore structure, surface roughness, nodules on the membrane surface, surface general morphology, mechanism of membrane fouling and the choice of membrane material. AFM, as a novel and effective physical method, still has potential on the examination of polymeric membranes.  
        关键词：Atomic force microscopy;Polymeric membranes   
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        发布时间：2021-03-12
      • LI Junling WANG Lihua ZHANG Lan TIAN Haibin WANG Yongxian
        Issue 3, (2003)
        摘要：N-Succinimidyl 3-(tri-n-butylstannyl)benzoate (ATE) was radioiodinated using Iodogen as oxidant and useful conjugate S125IB of labeling proteins was obtained . ATE and Iodogen affecting labeling proteins were successfully isolated from S125IB by Sep-Pak silica . The labeling efficiency was more than 93%. Several factors affecting labeling such as labeling time, the amount of Iodogen and the mole ratio of ATE to Na125I, were studied. The better labeling conditions were obtained as follows: mole ratio of ATE to Na125I = 6:1, Iodogen=7mg , labeling time = 5min in room temperature.  
          
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        发布时间：2021-03-12
      • ZHANG Guoguang OUYANG Xiaoping ZHANG Qianmei WANG Qunshu HUANG Longsheng ZHANG Xianpeng
        Issue 3, (2003)
        摘要：Using Monte-Carlo method we have calculated the gamma-ray sensitivity of a newly developed cascading Si-PIN detector.The results indicate that the cascading detector has a higher sensitivity than the single Si-PIN detectors. The sensitivity of cascading detector is related to the thickness of teflon piece.The measured sensitivities of the cascading Si-PIN detector and the general single Si-PIN detector to 1.25MeV gamma-rays are very close to the calculated values.  
        关键词：Si-PIN detector;Energy deposition;Sensitivity enhancement;Sensitivity calibration   
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        发布时间：2021-03-12
      • WANG Meng GUO Zhongyan ZHAN Wenlong XIAO Guoqing XU Hushan MAO Ruishi HU Zhengguo CHEN Zhiqiang SUN Zhiyu LI Jiaxing WANG Wusheng CHEN Lixin LI Chen BAI Jie ZHANG Xiaoan ZHANG Jinxia LI Cunfan
        Issue 3, (2003)
        摘要：A two-dimensional positional sensitive parallel-plate avalanche detector (PPAC) with 100mm?00mm active area has been developed for RIBLL. The detector consists of one anode and two cathodes. Each cathode position signal is readout with a resistance chain. The PPAC was tested at 700 Pa of flowing isobutane and +500 V at the anode, and an intrinsic position resolution of 0.76 mm (FWHM) was determined.  
        关键词：PPAC;RIBLL;Charge division   
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        发布时间：2021-03-12
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