最新刊期
      卷 0 ， 期 0 ， 2020
      • ZHU Suyun ZHANG Guobin LIU Liangbao SUN Zhe SHENG Liusi
        Vol. 35, Issue 4, (2012)
        摘要：A high resolution vacuum-ultraviolet(VUV) beamline has been designed at NSRL for ARPES measurements.Grazing-incident SGM is used to increase the total efficiency.Optical design is optimized to reduce aberration.Well-matched precision mechanism is adopted.And preliminary experimental results on the new beamline show that meV energy resolution has been realized.  
        关键词：Synchrotron radiation;Angle-resolved photoemission spectroscopy;Beamline   
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        发布时间：2021-03-05
      • ZHU Jiangwei~
        Vol. 35, Issue 4, (2012)
        摘要：Based on the characteristics of soft X-ray spectro-microscopy at Shanghai Synchrotron Radiation Facility (SSRF),we explore in this paper the possibility of performing soft X-ray CDI(coherent X-ray diffraction imaging) for 3D elemental mapping.The dual-energy contrast analysis algorithm of CDI is deduced.The experiment method is simulated with Fe as the element under analysis in an organic sample(with C as the major element beyond analysis). The analysis sensitivity is estimated,and noise effect on the elemental mapping is analyzed.The results are of help in developing the soft X-ray CDI application.  
        关键词：X-ray optics;Coherent diffraction imaging;Compared dual-energy analysis;3D elemental mapping   
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        发布时间：2021-03-05
      • WANG Rui~1 LI Wenbin~2 LIU Bo~1 WANG Xingtao~1 FENG Chao~1 LAN Taihe~1 CHEN Jianhui~1 ZHANG Tong~1 DENG Haixiao~1 WANG Zhanshan~2 WANG Dong~1 1
        Vol. 35, Issue 4, (2012)
        摘要：Good temporal coherence is a significant advantage of the seeding free electron laser(FEL) compare with FEL of the self-amplified spontaneous emission(SASE) type.The temporal coherence properties of HGHG (high-gain harmonic generation) pulses on the Shanghai Deep Ultra-violate FEL at Shanghai Institute of Applied Physics are measured at 600 nm and 400 nm(the wavelength of seed laser is 1200 nm) by a Michelson interferometer with sub-femto second time resolution.At zero delay visibilities of 0.88±0.02 at 600 nm and 0.66±0.06 at 400 nm are measured.The delay of one partial beam reveals coherence time of 119±6.7 fs at 600nm and 112±16.9 fs at 400 nm.  
        关键词：Temporal coherence;HGHG;FEL(Free Electron Laser)   
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        发布时间：2021-03-05
      • DU Weitao SONG Li WANG Yuzhu LUO Hongxin ZHANG Yifei WANG Jie
        Vol. 35, Issue 4, (2012)
        摘要：In this work,surface roughness of two large-size super-smooth mirrors,of 210 and 320 mm in length, was studied by grazing incidence X-ray scattering method(GIXRS).A two-dimensional theoretical model was derived based on Tong’s result in 1993,so as to the correlate power spectrum density(PSD) of a mirror surface to the intensity distribution of X-ray scattering.The two mirrors were measured on Beamline 16B at Shanghai Synchrotron Radiation Facility and the data were analyzed.The results showed that the root mean square of the surface roughness calculated using the model agreed well with that measured by a white-light 3D profiler.  
        关键词：Power Spectrum Density(PSD);Root Mean Square(RMS);2D GIXRS;Super-smooth mirror;Synchrotron radiation;White-light 3D profiler   
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        发布时间：2021-03-05
      • YAN Jingwen JANG Shiping CHEN Liang
        Vol. 35, Issue 4, (2012)
        摘要：In this paper,Synchrotron Fourier Transform Infrared（SFT-IR） microspectroscopy is used to investigate low dose radiation response of colorectal cancer cell line（HCT116）,based on changes in the of peak position and intensity of the absorption bands in the spectra collected from an individual cell before and after irradiation.The distinct changes in symmetric and antisymmetric stretching vibration of phospholipids at 1079 and 1236 cm-1 are attributed to radiation damage to the skeleton of nucleic acid of cells.The radiation damage to HCT116 can be characterized sensitively and quickly by SFT-IR,which is an effective and fast method to detect the radiation responses.  
        关键词：Synchrotron radiation;Soft X-ray;Fourier transform;spectra of single cell;Colorectal cancer cell   
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        发布时间：2021-03-05
      • GU Zhou~
        Vol. 35, Issue 4, (2012)
        摘要：Faience is supposed to be the precursor of ancient glass.Studies on Chinese faience are of help in understanding the origin and development of Chinese ancient glass.In this paper,non-destructive methods of SR-μCT, XRD and EDXRF are used to analyze a faience bead from Peng state in Western Zhou period(BC1046-BC771).The results show that the bead body is composed of micro quartz particles,and the body is denser than that of Western faience.The manufacture procedure can be deduced as follows:based on a cylinder core,the quartz particles were piled to form the body,which was then glazed and heated;after that the core was stripped.This technology was influenced by the bronze and protoporcelain production.Micro CT has great potential to study microstructure of ancient faience.  
        关键词：Faience;Micro-CT;Three-dimensional reconstruction;Manufacturing process   
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        发布时间：2021-03-05
      • LI Jiaqing HE Zhijiang SHI Liqun
        Vol. 35, Issue 4, (2012)
        摘要：In this paper,effects of helium bubbles in Ti film samples on their RBS spectrum are investigated theoretically and experimentally.While the stopping power of materials,multiple-scattering of the ions,and factors of the experimental setup affect the RBS spectra,the helium bubbles can affect the RBS spectra,too.The size and density of helium bubble can be calculated when the fraction of total volume occupied by helium bubbles and energy spread due to the helium bubbles are obtained by ion beam analysis.ERDA,RBS and positron annihilation spectrometry are used to examine titanium film samples containing different helium concentrations.The experiment results show that the low energy edges of RBS spectra are broadened when the sample is annealed,or the helium concentration is high,,and the low energy edges of RBS spectra broadening increases with the annealed temperature and the helium concentration.Using nuclear analysis techniques,one is able to know the behavior of helium bubbles in materials,and the real nature of materials as well.  
        关键词：RBS;Helium bubble   
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        发布时间：2021-03-05
      • WANG Yu HAN Songbai HE Linfeng WEI Guohai HAO Lijie WU Meimei WANG Hongli LIU Yuntao CHEN Dongfeng
        Vol. 35, Issue 4, (2012)
        摘要：Spatial resolution is an important parameter for neutron radiography facility.In this paper,different methods to define the spatial resolution,such as point spread function(PSF),line spread function(LSF),edge spread function(ESF) and modulation transfer function(MTF),are analyzed and compared.MTF turns out to be the best,as it is derived from the linear system theory in a given frequency domain,and gives the maximum amount of useful information on system signal modulation.  
        关键词：Neutron radiography;Spatial resolution;Point spread function;Line spread function;Edge spread function;Modulation transfer function   
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        发布时间：2021-03-05
      • TAN Zhijian TANG Qiang ZHANG Chunxiang LUO Daling
        Vol. 35, Issue 4, (2012)
        摘要：In this paper,MgSO4:Dy,MgSO4:Tm and MgSO4:Mn phosphors are prepared by high temperature solid state reaction.The MgSO4:Dy and MgSO4:Tm are mixed and sintered with MgSO4:Mn to obtain MgSO4:Dy,Mn and MgSO4:Tm,Mn co-doped TL dosimeters.The TL spectra show that Dy,Tm and Mn ions glow independently at sintering temperature of 700°C.At sintering temperatures of over 800°C,the glow peak of Mn becomes weak,but the high temperature peaks of Dy and Tm become strong.These indicate that the formation of TL defect complex depends on the sintering temperature.At higher sintering temperatures,more Mn ions are combined with the rare earth ions,therefore,we can observe clearly the luminescence processes of the energy transfer of Mn ions to the rare earth ions and the suppression to low temperature peaks of Tm and Dy.  
        关键词：Thulium;Dysprosium;Manganese;MgSO4;Thermoluminescence   
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        发布时间：2021-03-05
      • ZHANG Jihong WAN Junsheng ZHAO Ying ZHONG Yunhong
        Vol. 35, Issue 4, (2012)
        摘要：In this work,the measurement of quartz pre-dose thermoluminescence at 110°C peak was studied,and the quartz sample preparation and the optimization of instrument parameters were carried out.The relationship among TL response of 110°C peak of quartz,quartz grain size,and activation temperature and time,were investigated.A method of quartz pre-dose thermoluminescence measurement was established.  
        关键词：Quartz;Pre-dose;Thermoluminescence;110°C peak   
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        发布时间：2021-03-05
      • PENG Mei CHEN Liang CHEN Yanzhou SUN Liangwei
        Vol. 35, Issue 4, (2012)
        摘要：In order to carry out the research of constant wavelength ultra small angle neutron scattering spectrometer （USANS）,the design principle is studied in this paper base on relevant information from international laboratories. The main components are designed and calculated by using the Simres and NOP codes,and analytic method.The channel-cut crystal for monochromator and analyzer,and the pre-monochromator are desiged,and minimum Q of spectrometer is calculated.The results indicate that width of Darwin plat affects the minimum Q of spectrometer,the angle resolution of reflectivity planes selected in the design can ensure a Q resolution in 10-5 order.After the monochromatic neutron guide,a vertical focus monochromator does not seem to increase neutron flux at the sample stage,to simplify the monochromator structure and its manufacturing process,we propose to use un-focus pre-monochromator after the monochromatic neutron guide.  
        关键词：USANS;Channel-cut crystal;Pre-monochromator   
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        发布时间：2021-03-05
      • LI Xia ZHANG Shuzhi WU Zhangwen HOU Qing GOU Chengjun
        Vol. 35, Issue 4, (2012)
        摘要：In this paper,we study the speedup effect when graphics processing unit（GPU） is used in intensity modulated radiation therapy（IMRT）.The pencil-beam-dose-response matrix multiplication calculation in optimization process is implemented in compute unified device architecture（CUDA） running on the GPU,and C running on the CPU.The speedup factors are compared and analyzed.Test results show that the maximum relative error of 5.822×10-7 can be found between the CPU results and GPU results,such discrepancy level is acceptable clinically,and the speedup factors reach 9-12 by using GPU.  
        关键词：GPU;CUDA;IMRT(intensity modulated radiation therapy)   
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        发布时间：2021-03-05
      • XU Yihe TAN Fangdong HE Linfeng
        Vol. 35, Issue 4, (2012)
        摘要：In this paper,we report an improved measurement method with a fast gas-filling multi-wire proportional counter.It needs shorter preparation time,with much lower working gas consumption rate than that of a flow-gas multi-wire proportional counter.In this way,it is a perfect low cost instrument for any sample measurement application ofαandβparticles with high detect efficiency,good count-rate linearity and practical results.  
        关键词：Vacuum and refillable;Flow gas;Argon methane;Activity measurement;Plateau curve   
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        发布时间：2021-03-05
      • YANG Bo~1 WANG Ping~1 WANG Fangwei~2 1
        Vol. 35, Issue 4, (2012)
        摘要：The time-of-flight neutron scattering spectrometer in CSNS(China Spallation Neutron Source) will use a bandwidth-limiting(BWL) neutron chopper for choosing neutrons of certain band ranges.Its control system should synchronize the phase signal of BWL neutron chopper with the timing signal from accelerator,and monitor operation status of the neutron chopper.In this article,we describe the structure of control system,the control principle,and the software design.Test results of the controlling accuracy and operation stability of the control system are given,too.  
        关键词：CSNS(China Spallation Neutron Source);Bandwidth limiting chopper;Phase synchronization;Compax3 T40;InteractX   
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        发布时间：2021-03-05
      • PENG Honghua~1 YU Tao~1 XIE Jinsen~1 LI Qing~2 XIA Bangyang~2 1
        Vol. 35, Issue 4, (2012)
        摘要：Supercritical Water-cooled Fast Reactor(SCWFR) presents features of combining fast and light water reactor characteristics in one design.The coolant mass flow rate is just as 1/8 as in the BWR,and the neutron energy is harder than in PWR,so it would has the breeding ability.In this paper,using different models of improved Flower-SCWFR core,the void reactivity effect,power distribution,and breeding ratio are analyzed by core zoning scheme,axial coolant densities zoning,seed and blanket assembly with suitable P/D value,MOX fuel with different design and enrichment zoning,and solid uranium matrix cooled by internal clad channels in blanket assembly.Finally, an optimized modal of the improved SCWFR cores-"Flower type" is obtained.  
        关键词：SCWFR;Breeding ratio;Power distribution;Void reactivity   
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        发布时间：2021-03-05
      • YAO Jian GENG Yanhong WANG Guanghua LIN Jun LIU Wei
        Vol. 35, Issue 4, (2012)
        摘要：In this paper,a method is established to quantitatively partition fractional contributions of polycyclic aromatic hydrocarbons（PAHs） in fine atmospheric particulate matters by using stable carbon isotopic analysis. Dichloromethane extraction,TLC purification,and gas chromatography-combustion system and isotope mass spectrometry（GC/C/IRMS）,are used to measure the stable carbon isotope compositions(δ13C).The fractional contributions of coal combustion,vehicle exhaust and biomass burning to the PAHs in the fine particulate matters (PM2.5) collected in Jiading district,a suburb of Shanghai,are estimated.The results show that theδ13C values increase with decreasing molecular weight.The coal combustion and biomass burning play bigger role than vehicle exhaust in the PAHs,compared to theδ13C values of PAHs in all kinds of potential pollution sources.The estimated contributions from coal combustion,vehicle exhaust and biomass burning to PAHs of PM2.5 range from 3%- 21%, 29%- 33%and 46%- 67%,respectively,which agree well with the surrounding condition of the sampling site, indicating that it is feasible to estimate the fractional contributions of PAHs quantitatively by using stable carbon isotopic analysis.  
        关键词：PAHs;fine particulate;source identification;stable carbon isotopes   
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        发布时间：2021-03-05
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