最新刊期
      卷 0 ， 期 0 ， 2020
      • XU Dejie YAN Zhongbao DU Hanwen FENG Zhongjun
        Vol. 32, Issue 7, (2009)
        摘要：Beam stability is an important requirement for Shanghai Synchrotron Radiation Facility, which will be a huge scientific platform for science research and technology development in China.However, the deformation on girders and magnets by temperature gradient is one of the main factors affecting the beam stability.In this paper, based on the combinatorial structure of standard cell storage ring, a simulation of thermal-mechanical coupling was made under various operating conditions by finite element solver software ANSYS WORKBENCH with parameters finite element method, temperature and thermal stress distribution of the combinatorial structure were acquired, which provided reference for controlling the girder and beam stability of SSRF.  
        关键词：Storage ring;Combinatorial structure;Beam stability;Thermal-mechanical coupling   
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        发布时间：2021-03-12
      • GU Xiang1 LIU Xiaoxia1 SUN Jianqi2 XIAO Tiqiao3 LIU Ping2 1
        Vol. 32, Issue 7, (2009)
        摘要：Angiogenesis plays an important role in tumor growth and metastasis.However, only vessels lager than 200 μm in diameter can be observed using conventional medical image.Synchrotron radiation(SR) phase contrast imaging, with a spatial resolution being as high as 1 μm, has great advantages in imaging soft tissue structure, such as blood vessels and tumors.The morphology of tumor angiogenesis at different stages in the 4T1 nude mice tumor window model was firstly studied without contrast agent using the SR phase contrast imaging at SSRF X-ray imaging and biomedical application beamline.The results showed dense, irregular and tortuous tumor angiogenesis with the smallest vessels of 20-30 μm in diameter.  
        关键词：Synchrotron radiation;Phase contrast imaging;Tumor angiogenesis   
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        发布时间：2021-03-12
      • SUN Bai1,2 KANG Chaoyang1 LI Ruipeng1 LIU Zhongliang1 TANG Jun1 XU Pengshou1 PAN Guoqiang1 1
        Vol. 32, Issue 7, (2009)
        摘要：ZnO thin films were grown on α-Al2O3(001) substrates at different temperatures by pulsed laser deposition(PLD).X-ray diffraction(XRD) and synchrotron radiation X-ray grazing incident diffraction(GID) were employed to study the crystalline quality and interface structure of the ZnO film on α-Al2O3(001).The results show that at lower temperature(450℃), the films are forced by the tensile stress of the substrate, which leads to increased lattice constant a near the interface.At the higher temperature(750℃), the films are forced by the pressure stress of the substrate, which leads to decreased lattice constant a near the interface.At the optimized temperature(650℃), the films are forced by the least stress of the substrate, hence the best crystalline quality of ZnO thin film.We also find that the lattice alignment of the vertical direction is more order than that of the plane.  
        关键词：ZnO;PLD;α-Al2O3(001);Grazing incident diffraction;Synchrotron radiation   
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        发布时间：2021-03-12
      • CHU Kecheng YIN Chongxian LIU Dekang
        Vol. 32, Issue 7, (2009)
        摘要：The main function of timestamp system is to synchronize the clock of control computers in the control system of an accelerator.Through timestamp system, one can make sure the precise causality between all kinds of data for trouble shooting and data analysis.In this paper, we describe the principle of timestamp system, and analyze the hardware structure and realization mechanism between several large accelerators in detail.A design of timestamp systems for lab environment is presented for applications at SSRF.Finally, we summarize the difference between these timestamp systems.  
        关键词：Timestamp;Time standard;Clock synchronization;Timestamp system   
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        发布时间：2021-03-12
      • ZHONG Shaopeng ZHAO Minghua LIN Guoqiang WANG Baoliang LIU Weihong ZHANG Junqiang MIAO Guocan
        Vol. 32, Issue 7, (2009)
        摘要：The linac of Shanghai Synchrotron Radiation Facility(SSRF) includes an electron gun, a sub-harmonic cavity, a fundamental buncher and four accelerators.It provides 150 MeV electron beams to the booster through the low energy transport line.Installation of the linac started in December 2006, the first beam was obtained in May 2007, and it achieved the designed specification in October 2007.In this paper, we present the installation of waveguide for the linac, the measurement and adjustment of waveguide phase length, and the beam parameters.  
        关键词：Linac;Phase length;Waveguide;Accelerating structure;Accelerating phase   
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        发布时间：2021-03-12
      • YU Jin CHEN Zhihao GU Ming
        Vol. 32, Issue 7, (2009)
        摘要：In the paper, we describe the design of the microwave power interlock and protection device for Shanghai Synchrotron Radiation Facility.The control circuit is the core of this interlock and protection system, which achieves the real time monitoring and control of microwave system interlock and protection signal and modulator interlock and protection signal.This system is capable of implementing signal transmission, too, with PLC.  
          
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        发布时间：2021-03-12
      • LI Xinxi HUANG Chaoqiang WANG Yan CHEN Bo
        Vol. 32, Issue 7, (2009)
        摘要：To improve the resolution of horizontal geometry scattering neutron reflectometer, strong but small divergence neutron pulse after the chopper of reflectometer is expected.Performance of a triple-disk chopper model with different physical parameters was simulated with Mcstas codes.The intensity and divergence as function of different physical parameters in given conditions were obtained.The results can provide theoretical basis for designing triple-disk chopper of a horizontal geometry scattering neutron reflectometer.  
        关键词：Triple disk chopper;Model design;Mcstas codes;Simulation   
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        发布时间：2021-03-12
      • ZOU Yongxiang1 WU Jianping2 1
        Vol. 32, Issue 7, (2009)
        摘要：In this paper, effects of surface smoothness, moisture content, density and mineral granularity of the samples on X-ray fluorescence yield are analyzed, and principals of data fusion and modular neural network are introduced.A neural network data fusion model was established, with its learning algorithm for correcting the interfering factors.With the model, error caused by surface smoothness, moisture content and density could be reduced to less than 10%.The results prove that the mathematic models have high precision and the fusion technology of information can be used for in-situ correction of XRF analysis results.  
        关键词：In-situ X-ray fluorescence analysis;Element;Interference;Data fusion;Neural network   
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        发布时间：2021-03-12
      • SONG Binbin WU Ping ZHOU Duowen YAN Dan ZHAO Yide ZHAO Shoutian ZHANG Shiping CHEN Sen
        Vol. 32, Issue 7, (2009)
        摘要：Hafnium oxide coatings were prepared at various O2/Ar flow ratios by RF(radio frequency) magnetron sputtering on low activation Martensitic steel.The effects of O2/Ar flow ratio on the deposition rate and the properties of HfO2 are studied.The results show that the deposition rate decreases with increasing the O2/Ar flow ratio.Moreover, the coatings prepared at various O2/Ar flow ratios are compact and the main phase of the coatings is monoclinic.Additionally the coatings prepared at the O2/Ar ratios 0.7 and 1.2 were broken down under 1 MV/cm and show poor electrical insulation properties, while the coatings prepared at smaller O2/Ar flow ratios show better electrical insulation properties.  
        关键词：RF magnetron sputtering;Hafnium oxide;X-ray diffraction;Insulation coating   
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        发布时间：2021-03-12
      • TENG Junrui GONG Jian HU Guangchun XIANG Yongchun HAO Fanhua LIU Suping LIU Xiaoya
        Vol. 32, Issue 7, (2009)
        摘要：A new method for arms control inspections of metal plutonium has been developed.It measures the 478 keV γ ray from 10B(n, α) 7Li reaction by neutrons generated in spontaneous fission of 240Pu in metal plutonium being inspected.In this work, simulations were performed for the converting and transporting process of neutron-photon, and adjusting parameters of the 10B target, including the 10B content of the target, thickness of the target, and the geometry parameters, in an attempt to optimize the converting efficiency.The results show that the method could be achieved detection efficiency of gamma yield of >10?5 per neutron, which allows the detection of kilogram of weapon-grade metal plutonium.  
        关键词：Arms control;10B target;Gamma production rate;Mass of metal plutonium   
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        发布时间：2021-03-12
      • CHEN Shaowen1,2 WANG Xuetao1,3 CHEN Lixin4 TANG Qiang1 LIU Xiaowei1 1
        Vol. 32, Issue 7, (2009)
        摘要：The EGSnrc Monte Carlo codes of BEAMnrc, DOSXYZnrc and DOSRZnrc were used to simulate absorbed dose of an Al2O3 dosimeter and absorbed dose of the equivalent water volume in corresponding position irradiated by radiotherapeutic Varian 600C 6 MV beams and Mohan 6 MV spectrum in a water phantom.The absorbed dose ratio factor fmd was calculated, and dosimetry characteristics of the Al2O3 dosimeter were discussed.Simulations were done for a cylindrical geometry dosimeter(Φ4 mm×1 mm) and the dosimeter was at the centre of the water phantom at different depths of 0.5-8.0 cm.The results reveal that the absorbed dose of the Al2O3 dosimeter is less than that of the equivalent water.The absorbed dose ratio factor is dependent on the dosimeter depth in the phantom.In the buildup region the absorbed dose ratio factor fmd is sensitive to the depth of the dosimeter.Over the buildup region fmd is insensitive to the depth.This allows the use of averaged absorbed dose ratio factor without introducing discrepancies more than 1.0%.  
        关键词：EGSnrc;Monte Carlo Simulations;Al2O3 dosimeter;Absorbed dose ratio factor   
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        发布时间：2021-03-12
      • XIAO Caijin1 NI Bangfa1 TIAN Weizhi1 WANG Pingsheng1 HUANG Donghui1 ZHANG Guiying1 LIU Cunxiong1 NIE Peng1 ZHANG Haiqing1 CHEN Zhe1,2 QIN Yali1,2 1
        Vol. 32, Issue 7, (2009)
        摘要：In order to meet the European environment standards, i.e.94/62/EC(Packaging and Packaging Waste 2004) and RoHS2003(Restriction of Hazardous Substance in Electrical and Electronic Equipment), three Chinese glass reference materials prepared by Chinese Academy of Geological Sciences were analyzed for certification by a number of laboratories with over 20 analytical methods.We participated in the certification analyses by using instrumental neutron activation analysis.Elemental concentrations of the glass samples were determined using relative method based on chemical standards, with k0 method as reference.NIST SRM 1633a was used for quality control.The results, together with preliminary reports from other participating labs, are presented.  
        关键词：Neutron activation analysis;RoHS;Glass reference material;Hazardous substance   
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        发布时间：2021-03-12
      • SHI Guozhu1,2 HE Ming2 WANG Xianggao2 LI Chaoli2 WANG Wei2 HUANG Chuntang1,2 ZHANG Dawei1,2 WU Shaolei2 SHEN Hongtao2 LV Xiaoxia2 WU Shaoyong2 WU Weiming1 JIANG Shan2 1
        Vol. 32, Issue 7, (2009)
        摘要：A method to determine 151Sm activity by liquid scintillation counter(LSC) was described and the 151Sm half-life was obtained in this paper.The γ and β spectra of neutron-activated 151Sm samples revealed that effects of the interfering nuclides on the 151Sm LSC measurement were negligible.Activity of the 151Sm samples was determined by LSC through the efficiency tracing(ET).A 151Sm sample of specific activity of(603.3±15.1) Bq/mg was obtained in the original sample and its relative standard error was 2.5%.151Sm/150Sm ratio of(3.750±0.002)×10-3 was obtained in the original sample by TIMS and ICP-AES with the 151Sm sample of specific activity.Finally, the half-life of 151Sm of(96.7±2.8)a was obtained, with a relative standard error of 2.9%, which is more accurate than other measurements.  
        关键词：151Sm;Liquid scintillation counter(LSC);Efficiency tracing(ET);TIMS   
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        发布时间：2021-03-12
      • WU Aidong LIU Lei
        Vol. 32, Issue 7, (2009)
        摘要：In radiotherapy, the transmission dose includes the dose contribution by scattered photons from the body volume of a patient exposed to the X-rays, and this affects clinic applications of the transmission dose method of radiotherapy.In this study, distributions of transmission dose under different conditions of 6 MV X-ray irradiation were measured on the central axis and the off-axis positions.The transmission dose composed of the primary dose and the scattered dose was analyzed.The primary dose was extracted from the transmission dose and the corresponding scattered dose was computed to study physical characteristics of these dose scattered by phantom.  
        关键词：Transmission dose;Primary dose;Scattered dose;Dosimetric verification   
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        发布时间：2021-03-12
      • DING Weicheng FANG Fang RUAN Juhong WANG Min HUANG Qiu
        Vol. 32, Issue 7, (2009)
        摘要：The current methods for air radon measurement are often of low sensitivity, and the measurement takes longer time.In this paper, based on comparative study and theoretic discussion, we propose an ionization chamber for consecutive air radon measurement.The ionization chamber under ordinary pressure has high detective efficiency in measuring radon and its daughters.A collector unit is equipped for collecting residual radon and its daughters in a measurement.This prevents radon and its daughters from polluting the ionization chamber for a subsequent measurement, a common problem with conventional methods of air radon detection.Feasibility of the design for instantaneous measurement of air radon has been proved in experiments.  
        关键词：Ionization chamber;Radon;α particle;Measuring;Count   
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        发布时间：2021-03-12
      • WU Dapeng1,2 ZHANG Xueheng1,2 YANG Yanyun1,2 YAO Xiangwu1,2 WANG Jiansong1 HU Zhengguo1 CHEN Jinda1,2 TANG Bin1,2 ZANG Yongdong1,2 YUE Ke1,2 TU Xiaolin1,2 XU Zhiguo1 CHEN Ruofu1 FU Fen1 XU Hushan1 ZHAN Wenlong1 1
        Vol. 32, Issue 7, (2009)
        摘要：In this paper, we describe the structure and readout system of a two-dimension positional sensitive CsI(Tl) detector, and investigates the relation between energy lose and light output of the CsI(Tl) detector with secondary beams in intermediate energy.Bρ+(ΔE-TOF) method was used to distinguish the secondary beam.Linearity of the position signals of the CsI(Tl) was corrected.Energy signals from the CsI(Tl) detector were calibrated using the relationship of the Z, A and the light output response of the incident particles.A good linear relation was found between the ADC output signals and the QDC(light) output signals of the CsI(Tl) detector.  
        关键词：CsI(Tl) detector;Light output;Energy lose;Energy calibration   
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        发布时间：2021-03-12
      • WANG Dong1 YANG Daojun2 ZHANG Quanhu1 HE Bin1 WANG Hua1 1
        Vol. 32, Issue 7, (2009)
        摘要：Nuclear material accounting is a key measure for nuclear safeguard.Software for MUF evaluation in item nuclear material accounting was worked out in this paper.It is composed of several models, including input model, data processing model, data inquiring model, data print model, system setting model etc.It could be used to check the variance of the measurement and estimate the confidence interval according to the MUF value.To insure security of the data multi-user management function was applied in the software.  
        关键词：Nuclear material accounting;MUF;Key measurement point;Balance area   
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        发布时间：2021-03-12
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