最新刊期
      卷 0 ， 期 0 ， 2020
      • CHEN Rongchang1,2 DU Guohao1 XIE Honglan1 DENG Biao1 ZHU Peiping3 TONG Yajun1 HU Wen1 XUE Yanling1 CHEN Can1 REN Yuqi1 ZHOU Guangzhao1 WANG Yudan1 XIAO Tiqiao1 XU Hongjie1 1
        Vol. 32, Issue 4, (2009)
        摘要：With X-ray phase contrast micro-tomography(CT),one is able to obtain edge-enhanced image of internal structure of the samples.This allows visualization of the fine internal features for biology tissues,which is not able to resolve by conventional absorption CT.After preliminary modulation,monochromatic X-rays(8-72.5 keV) are available for experiments on the experimental station of the biomedical imaging beamline at Shanghai Synchrotron Radiation Facility(SSRF).In this paper,we report the in line phase contrast micro-tomography(IL-XPCT) of biology sample(locust) on the beamline.The reconstruct slice images and three dimensional rendering images of the locust were obtained,with clearly visible images of locus’s wing,surface texture and internal tissue distribution.  
        关键词：CT;Phase contrast imaging;X-ray;Synchrotron radiation   
        16
        |
        11
        |
        8
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230752 false
        发布时间：2021-03-12
      • ZOU Yang GU Songqi JIANG Zheng WEI Xiangjun MA Jingyuan HUANG Yuying XU Hongjie
        Vol. 32, Issue 4, (2009)
        摘要：In this paper,we report the development of a data acquisition system of BL14W1 XAFS(X-ray absorption fine structure) beamline at Shanghai Synchrotron Radiation Facility(SSRF).The data acquisition system includes two ion chambers,two amplifiers,one ADC,Labview software etc.For quick communication between Labview and EPICS,the newly-developed DSC module by National Instruments is used.The XAFS beamline has been a success in accomplishing data acquisition for XAFS spectra in step-by-step mode and Quick XAFS mode.  
        关键词：Synchrotron radiation;EPICS;LabVIEW;DSC;XAFS   
        19
        |
        14
        |
        11
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230847 false
        发布时间：2021-03-12
      • LI Shaoxia1,2 WANG Bing1 MENG Qiang1,2 FENG Weiyue1 WANG Zhuo2 KUI Rexi3 QIAN Haijie3 WANG Jia’o3 1
        Vol. 32, Issue 4, (2009)
        摘要：Dextran-coated Fe3O4 nanoparticles were prepared by untrasonification of Fe3O4 nanoparticles with dextran at 85°C in sodium citrate medium.The surface chemical component,structure and bond of uncoated and dextran-coated nanoparticles were measured by synchrotraon radiation XPS(X-ray photoelectron spectroscopy).Qualitative and quantitative analysis of C1s and O1s of Fe3O4 and dextran-Fe3O4 showed that the Fe3O4 nanoparticles were successively coated by sodium citrate via Fe-O-C bond,and dextrans,which can be linked with their carboxylate moiety via hydrogen bond.Sodium citrate could enhance the disperse stability of reaction system and hydrophilicity of dextran-Fe3O4.  
        关键词：Fe3O4 nanoparticles;Dextran;Surface coating;XPS(X-ray photoelectron spectroscopy)   
        10
        |
        11
        |
        2
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230730 false
        发布时间：2021-03-12
      • ZHANG Baichun1,2 LENG Yongbin1 1
        Vol. 32, Issue 4, (2009)
        摘要：Electromagnetic coupling electrode is the most popular pickup to monitor beam position of an accelerator.The output signals of BPM pickup carry not only beam position information but also beam bunch charge information.Based on a study to have a better knowledge of the relationship between sum signal of electrodes and beam charge using finite element method,we developed a Matlab software package to calculate bunch charge calibration factor for different type of BPM pickup.Simulation for the storage ring BPM pickup of SSRF showed that bunch charge calibration factor variation is less than ±0.1% within 2.5 mm radius of pickup center.  
        关键词：BPM pickup;SSRF;Bunch charge measurement;Finite element method   
        10
        |
        11
        |
        2
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230595 false
        发布时间：2021-03-12
      • TANG Junlong1 LI Deming2 SHEN Tianjian2 1
        Vol. 32, Issue 4, (2009)
        摘要：Based on available digital PS testing system and long-distance monitoring hardwares,the cyclical monitoring system for digital power supplies(PS) was developed at SSRF.Two models,i.e.long-distance cyclical monitoring and local cyclical monitoring,were established.The software developed in LabVIEW language was applied to the two models without any user interface modification.The user interface is simple.The system is suitable for debugging the digital PSs during long-distance monitoring and examining the performance.The long-distance model imitates the digital PSs’ status for fault analysis and communication between the digital PS and the centre control room.The local model simultaneously examines stability of 18 new PSs for 24 h,monitors the PS controller,and detects malfunction.Parameters and status of the controller can be stored in Excel or Text file.The two models have been used at SSRF for monitoring the digital PSs.  
        关键词：Digital power supply;Cyclical monitoring;SSRF;LabVIEW   
        11
        |
        11
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230556 false
        发布时间：2021-03-12
      • QIN Xiubo1,2 WANG Ping1 JIANG Xiaopan1,2 YU Runsheng1 WANG Baoyi1 WEI Long1 1
        Vol. 32, Issue 4, (2009)
        摘要：Positron Annihilation Induced Auger Electron Spectroscopy(PAES) has several advantages over those excited by X-rays,high energy electrons or neutrons,such as excellent surface selectivity,high signal-to-noise ratio,low radiation damage,etc.A physical design of time of flight PAES(TOF-PAES) apparatus based on the Beijing Intense Slow Positron Beam(BIPB) is described in this paper.The positrons and electrons are transported in a 4×10-3 T uniform magnetic field,and the gradient of magnetic field is designed to parallelize the Auger electrons emitted with 2π angle.The Auger electron energy is adjusted by a Faraday cage to optimize the energy resolution,which can be better than 2 eV.  
        关键词：Auger electron spectroscopy;Positron annihilation techniques;Time of flight;Energy resolution;Faraday cage   
        11
        |
        11
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230517 false
        发布时间：2021-03-12
      • LI Peng1,2 YUAN Youjin1 MAO Lijun1 XIA Jiawen1 YIN Dayu1,2 1
        Vol. 32, Issue 4, (2009)
        摘要：In commissioning the HIRFL-CSR(Cooler Storage Ring of Heavy Ion Research Facility in Lanzhou),with the spectrum analyzer monitoring the beams on-line,we measured many parameters of the beam status for improving quality of the heavy ion beams.In this paper,the sudden change of the beam center frequency is analyzed.A theoretical analysis is done mainly on instabilities of the electron voltage and the neutralization factor.Simulations were made for the problem.According to the simulation result,we can conclude that it is the instability of neutralization factor that caused the problem.  
        关键词：Spectrum analyzer;Electron cooling;Momentum distribution;Neutralization factor   
        11
        |
        11
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230833 false
        发布时间：2021-03-12
      • SUN Peng1,2 JIANG Bo3 HE Jie1 LIU Qiang1 ZHENG Dan1 LIN Libin1 1
        Vol. 32, Issue 4, (2009)
        摘要：A new type of radiochromic films for low dose irradiation was developed at our lab.The films irradiated by γ-rays turn blue from pink.Under 5-50 Gy irradiation,absorbency of the main absorption peak has linear relationship with the absorbed dose.On account of the sensitization effect of the coagent reagent in the film preparation,the radiochromic response range and sensitivity of the films could be adjusted by concentration of the coagent reagent.In consideration of good in-batch uniformity(the deviation with average <3%) and inter-batch uniformity(the deviation with average <5%) that the films have,the radiochromic films could serve to measure the absorption dose of γ-rays as a radiochromic films dosimeter.  
        关键词：Radiochromic films;γ-ray;Absorbed dose;Sensitivity;Dosimeter   
        11
        |
        11
        |
        4
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230628 false
        发布时间：2021-03-12
      • XIONG Zhengye1 TANG Qiang2 CHEN Jingmin1 ZHENG Bihua1 LIANG Xuemin1 MA Weijiang2 1
        Vol. 32, Issue 4, (2009)
        摘要：Based on the thermoluminescence(TL) data,the ancient dose in volcanic rocks near Huguangyan Maar Lake was calculated with sensitized revise technique.The cumulate dose for 78 d in TL dosimeters placed in grottos was measured,and the annual dose in volcanic rocks was reckoned.Based on the results of the ancient dose and the annual dose,the time of the volcano eruption to form Huguangyan Maar Lake is estimated before about(158±29) ka,and this is consistent with the acknowledged result.The results indicate that the Coarse-grain TL technique can be used for Quaternary period dating if the sensitized effect of quartz is taken into account.  
        关键词：Thermoluminescence(TL);Huguangyan Maar Lake;Sensitized effect of Quartz;Dating   
        14
        |
        12
        |
        3
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230471 false
        发布时间：2021-03-12
      • JIANG Xinbiao1 ZHANG Wenshou1 YANG Ning1 YUAN Daqing2 TU Jing1 1
        Vol. 32, Issue 4, (2009)
        摘要：In this paper,we report the development of a system for 3He and fast neutron sandwich spectroscopy.It consists of a gas-filling system,two planar Si detectors,digital coincidence electronics with three channels and data handling system.Detail descriptions are given on numerical simulations,and experiment calibrations,of the subsystems to optimize the detection efficiency with reduced coincidence backgrounds.The results show that the work is of help for further studies on 3He fast neutron sandwich spectroscopy.  
        关键词：Xi’an pulsed reactor;Neutron spectrum;Coincidence method   
        11
        |
        11
        |
        2
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230567 false
        发布时间：2021-03-12
      • MA Mingwang CHEN Xiliang YANG Kang YANG Xiaomin LIU Dan ZHU Zhiyong
        Vol. 32, Issue 4, (2009)
        摘要：Silica glass samples were irradiated with 1.157 GeV 56Fe ions to fluence of 0.5×1012,1×1012 and 3.8×1012 ions/cm2.The radiation-induced defects were examined by ultraviolet-visible(UV-Vis),photoluminescence(PL) spectroscopy and electron paramagnetic resonance(EPR) measurements.Various defects such as E’ centers,non-bridging oxygen hole centers(NBOHC) and oxygen deficient centers,ODC(II),were induced by the irradiation in production cross-sections of 90-140 nm2.The number densities of the defects increased with the fluence and came to saturation at high fluences.It was found that E’ center and NBOHC were created simultaneously from the scission of strained Si-O-Si band.The PL results showed that the intensity of α and γ band increased with the fluence and tended to saturate at high fluences,while the intensity of β band decreased with increasing fluence.It was concluded that β band belonged to an intrinsic defect in silica glass.EPR measurement confirmed the production of E’ centers with a production cross-section of 138 nm2,which was similar to that found in the UV-Vis measurement.  
        关键词：Silica glass;High energy heavy ions;Color centers   
        9
        |
        11
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230715 false
        发布时间：2021-03-12
      • LI Zhengkui1,2 YANG Zhuyou1,2 LAI Dingdong1 ZHANG Xiaojiao1 SHI Luna1 WANG Yueming1 WU Kai1 CHEN Qichun1 1
        Vol. 32, Issue 4, (2009)
        摘要：An new kind of ammonia-oxidizing bacteria,Comamonas aquatic LNL3,was screened out and immobilized by radiation-copolymerized carrier.Four factors affecting the short-cut nitrification,i.e.temperature,pH,alkalinity and dissolved oxygen(DO) concentration,were been investigated.The kinetics model of short-cut nitrification for immobilized Comamonas aquatic LNL3 was established and sensitive degree of the affecting factors was discussed.The result show that optimal conditions are 30℃ of temperature,pH 8.5,alkalinity/NH4+-N of 7.14,and DO concentration of 4.03 mg/L.In addition,for short-cut nitrification the four affecting factors are in a sequence of pH > temperature > alkalinity > DO concentration.  
        关键词：Short-cut nitrification;Immobilized;Comamonas aquatic LNL3;Kinetics   
        11
        |
        11
        |
        7
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230645 false
        发布时间：2021-03-12
      • ZHOU Wenglan WU Hubing WANG Quanshi
        Vol. 32, Issue 4, (2009)
        摘要：In this paper we discuss the value of 18F-FDG PET/CT on the TNM staging of colorectal cancer before surgery.Forty-one patients diagnosed with colorectal cancer from surgery were examined by 18F-FDG PET/CT.PET/CT findings were compared with post-operative pathology.The sensitivity of colorectal cancer was 97.6% by PET and 100% by PET/CT.The diagnostic accuracy of T-stage and N-stage and metastasis and TNM-stage before operation in colorectal cancer were 85.4%,85.4%,97.6% and 75.6% respectively,and the correlation with surgical appearances and pathological findings were 0.574,0.670,0.918 and 0.664 respectively,all P<0.01.Good correlation exists between manifestations on PET/CT and operative pathology.PET/CT may become a good choice diagnostic modality for pre-treatment staging evaluations of colorectal carcinomas.  
        关键词：Colorectal cancer;Staging;Tomography;Emission-computed;Deoxyglucose   
        13
        |
        12
        |
        3
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230605 false
        发布时间：2021-03-12
      • ZHANG Chunchun1,2 HUANG Liliang1,2 ZHU Hua1,2 SUN Yanhong1 ZHANG Yuanqing1,2 XU Jia1 SHEN Yumei1 1
        Vol. 32, Issue 4, (2009)
        摘要：(2R*,3S*)-5-[bis(2-pyridyl-methyl)-amino]-2,3-bis(4-hydroxyphenyl) pentanenitrile,a novel molecular probe precursor for imaging estrogen receptor β,was synthesized by the following procedures:condensation,vinylation,demethylation,methoxymethyl protection,hydroboration-oxidation,methane sulfonylation,iodination,substitution by secondary amine,deprotection starting from 4-methoybenzaldehyde and 4-methoxybenzyl cyanide.Its Re-tricarbonyl complex was synthesized with cold labeling.The precursor was radiolabeled with 99mTc successfully.The structures have been confirmed by 1H NMR,FTIR and MS characterization or elemental analysis.The study of help in the assessment of breast cancer stages by imaging ERβ with SPECT.  
        关键词：ERβ;Molecular probe;99mTc;Radiolabeling;Breast cancer;SPECT   
        10
        |
        11
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230682 false
        发布时间：2021-03-12
      • LIU Dongmei WAN Baonian SHEN Biao
        Vol. 32, Issue 4, (2009)
        摘要：In this paper,a new timing trigger module for integrator system on HT-7 Tokamak is designed by probing into the design idea of using single chip and transistor.The hardware and software of the module are described in detail.With the module,the integrator system is featured by its precise timing,which can be set external,and its accurate triggering and strong output driving capabilities.The timing trigger module has improved the reliability and the application scope of the system integrator,satisfying the requirements of HT-7 experiment.  
        关键词：Timing trigger module;Singlechip;Integrator;HT-7   
        10
        |
        13
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230617 false
        发布时间：2021-03-12
      • YIN Jilei1,2 LI Yufeng3 KANG Cheng3 ZHU Ying1 LI Yulan1 LI Wenxin1 GONG Qianfeng2 HUANG Qing1 LI Qingnuan1 1
        Vol. 32, Issue 4, (2009)
        摘要：In this work,TiO2 nanoparticles of 3 nm in size were synthesized by sol-gel technique and injected intravenously into mice.The organs were collected at 0.5,1,3,6,24 and 48 h after injection.Ti content in the organs was detected by inductively coupled plasma mass spectrometry(ICP-MS).The results indicated that injected TiO2 nanoparticles were translocated into the organs via bloodstream immediately after injection,and deposited mostly in lung,liver and spleen.The TiO2 uptake(%ID/g) in the three organs reached the peak value of 141.73%,25.55%,and 18.07% at 6 h,1 h and 1 h after injection,respectively.The results also showed that there was significant amount of Ti in the brains of the control,and the brain Ti content increased markedly after injection.At 1,3,6,24 and 48 h after injection the brain Ti content was higher than that in blood.The experiment indicated that its toxicity on brain would be the emphasis of biological impact study of nano TiO2.  
        关键词：Titanium dioxide;Intravenous injection;ICP-MS;Biodistribution   
        12
        |
        12
        |
        2
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7230533 false
        发布时间：2021-03-12
      • HU Chunming LAN Xiaohua ZHENG Zhou LIU Xiankun
        Vol. 32, Issue 4, (2009)
        摘要：The most dangerous accident of a cold neutron source is explosion of H2-air mixture inside the vacuum containment(VC).An experimental study with hydrogen-air stoichiometric concentration in VC has been done in a full-scaled set-up.The shock pressure curves of the explosion at different initial places were obtained.The results indicate that the explosion in VC is just a deflagrating,and the maximal shock pressure is about 350 kPa.The von Mises equivalent stress and the main stresses calculated are well below the stress limit of the material for VC.It can be concluded that the VC can keep its integrality even the hypothetical hydrogen explosion inside it,and the explosion will do none harm to the reactor structures around VC.  
        关键词：Cold neutron source(CNS);Vacuum containment;Hydrogen;Deflagrate;Shock pressure   
        13
        |
        11
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7231174 false
        发布时间：2021-03-12
      0