最新刊期
      卷 0 ， 期 0 ， 2020
      • YUAN Qingxi ZHU Peiping HUANG Wanxia WANG Junyue WU Ziyu HU Tiandou
        Issue 8, (2007)
        摘要：According to the demand of beamline and the current research subject, we upgraded the BSRF-4W1A beamline. During the upgrade, the azimuthal angle of 4W1A with respect to the wiggler was redesigned, a new double crystal monochromator with fixed exit was designed, the upside cooling mode of the monochromator’s first crystal was proposed. By ray-tracing calculation, the flux at the commonly used energy 8 keV is promised to increase to 3.6 times, and the energy is promised to expand from 8 keV to 19.6 keV under the condition of the same flux.  
          
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        发布时间：2021-03-12
      • ZHANG Fan 1,2 XIE Yaning 1 ZHANG Xiaowei 3 HU Tiandou1 1
        Issue 8, (2007)
        摘要：Position sensitive device (PSD) is an optoelectronic position sensor utilizing photodiode surface resistance, features high-speed response, high position resolution and high reliability. The performance of PSD under X-ray was tested. Based on this test, an X-ray beam position monitor (XBPM) utilizing PSD was designed, some calculation supporting the design was also performed.  
        关键词：Synchrotron radiation;X-ray beam position monitor;Position sensitive device   
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        发布时间：2021-03-12
      • HOU Xinggang LIU Andong
        Issue 8, (2007)
        摘要：In order to improve photocatalytic property of TiO2 films, the films were implanted with 40 keV V+ ions to doses of 0.6×1016,1×1016 , 3×1016 or 6×1016 ions/cm2. Optical band gap of the V+ ion-implanted TiO2 films were measured by a spectrophotometer. The results show that the optical band gap of TiO2 films decreased with the increasing implantion dose. Methyl orange (MO) in aqueous solution was catalyzed by the ion-implanted TiO2 films under visible light.  
        关键词：TiO2 film;Ion implantation;UV-Vis spectrum;Visible light photocatalysis   
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        发布时间：2021-03-12
      • LIU Qi YANG Xiaoming FU Haiying ZHU Zhiyong
        Issue 8, (2007)
        摘要：NIPAAm hydrogels were prepared by γ-irradiation to various doses. The temperature responsive and the swelling behaviors of the hydrogels were monitored by DSC and gravimetric measurements. Mechanical properties of the hydrogels were characterized by rheology measurements. It is found that the microstructure of hydrogel changes dramatically with dose. At lower doses the formed hydrogel is inhomogeneous with many branched long chains in the network. The incomplete molecular network resulted in a limited swelling and lower strength of the hydrogel. At higher doses, the over cross-linked network prevents water permeation and therefore inhibits swelling of the hydrogel. It is found that under present experimental conditions, the hydrogel prepared at a dose of 30kGy shows the best swelling and mechanical properties.  
        关键词：NIPAAm;Radiation synthesize;Hydrogel;Temperature sensitive   
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        发布时间：2021-03-12
      • LIU Yujuan1 ZHANG Bin2 WANG Kun3 YAO Shude3 WANG Li4 JIANG Fengyi4 1
        Issue 8, (2007)
        摘要：The elastic strain of ZnO film, grown on Al2O3(0001) substrate by MOCVD, was studied by RBS/Channeling. Its χmin is 5.1%, which shows that ZnO film has very high crystal quality. The positive tetragonal distortion indicates that pull strain in the horizontal direction and press strain in the vertical direction happen. The elastic strain is gradually released from interface to surface. In the interface, the elastic strain is the maximum, while in the suface, it is the minimum.  
        关键词：RBS/Channeling;ZnO film;Crystal quality;Tetragonal distortion   
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        发布时间：2021-03-12
      • JIANG Tao1 YANG Tongzai1 QIU Jiuzi2 YANG Jun1 1
        Issue 8, (2007)
        摘要：Preparation method of HfF4 for Accelerator mass spectrometry(AMS) was studied. The HfO2 sample was transformed to HfF4 suited to AMS measurement through the purification flow and HfF4 preparation flow of HfF4.The decontamination coefficient of the purification flow is high, especially for tungsten. The sample is suitable to the measurement of AMS.The yield of the whole flow was about 70% for Hf. The decontamination coefficient for W was about 106.  
        关键词：HfF4;Accelerator mass spectrometry;Sample preparation;Decontamination coefficient   
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        发布时间：2021-03-12
      • LIU Wenke CAO Xiaohua PENG Shuming LONG Xingui YANG Benfu LUO Shunzhong WANG Weidu CHENG Guijun
        Issue 8, (2007)
        摘要：Study of theory and experiment which effects of the thickness of oxide layer on the surface of titanium tritide film on yield of neutron from deuterium reaction to tritium were done .The results of theoretical calculation show that when the energy of deuterium nuclei was 120 keV, the depth which deuterium nuclei enter into titanium tritide films is 833 nm, the range of depth which deuterium nuclei enter into oxide layer is from 527 nm to 577 nm. The experimental results indicate that oxide layer reduce the yield of neutron from deuterium reaction to tritium,and the thicker the oxide layer is, the less the yield of neutron is. When the thickness of oxide layers is within 220 nm, the linearity between the yield of neutron and the thickness of oxide layer isY=(7.524-0.01326X) ×106.  
        关键词：Titanium tritide film;Oxide layer;Yield of neutron   
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        发布时间：2021-03-12
      • QIAN Dongbin1,2 MA Xinwen1 ZHAO Zhizheng1 ZU Kailing1 DONG Chenfu ZHANG Dacheng1,2 1
        Issue 8, (2007)
        摘要：A new application of V-F converter for quasi-continuum laser physics experiment is described. It is used to convert not only direct current analog voltage outputted by powermeter, but also pulse analog voltage outputted by particle detector. Tests have demonstrated that linearity of the conversion reached ±0.015% for 10—1000mV of direct current analog voltage and ±0.23% for 400—7800mV of pulsed analog voltage. The accuracy satisfies experimental requirement.  
        关键词：V-F conversion;Direct current analog;Pulse analog;Integral linearity;CAMAC multi-scalar acquisition system   
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        发布时间：2021-03-12
      • LIU Lipo LIU Yibao
        Issue 8, (2007)
        摘要：The energy of excitation source is one of important indicators in detecting characteristic X-rays. The effect of excitation efficiency of characteristic X-rays with different energy excitation source to iron, copper and siller are studied by MCNP4C Monte Carlo program. The coincidence with comparison of experiment data shows that The Monte Carlo simulation can be used to design the optimized system of detecting the characteristic X-rays.  
        关键词：Excitation efficiency;Monte Carlo simulation;Characteristic X-rays   
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        发布时间：2021-03-12
      • SONG Zhaorui 1 CHENG Xinhong2 ZHANG Enxia 1 XING Yumei 1 YU Yuehui 1 ZHENG Zhihong 1 SHEN Qinwo 1 ZHANG Zhengxuan 1 WANG Xi 1 1
        Issue 8, (2007)
        摘要：Total-dose irradiation responses of HfON and HfO2 dielectric films were studied with their MIS structures and under 10keV X-rays. The flatband voltage shifts of HfON MIS structures are much smaller than HfO2 MIS structures under different total-doses up to 30 kGy(Si). The influence of the added nitrogen element on total-dose irradiation tolerance of Hf-based dielectric films was also discussed.  
        关键词：High-k HfON dielectric film;Total-dose irradiation;Trap charge   
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        发布时间：2021-03-12
      • JI Shundong1 FANG Wei3 ZHOU Jundong2 HE Zuoxiang3 LIU Xiujie3 RUAN Changgeng1 ZHAO Ming4 1
        Issue 8, (2007)
        摘要：FM-2 was modified with 2-iminotholane and labeled with 99Tcm-GH. The radiochemical purity of 99mTc-FM-2 was over 95% and can stable in the routine temperature for more than 8 hours. Biodistribution in mice showed 99mTc-FM-2 was cleared mainly by liver and kidney. The normal myocardial showed a high uptake and rapid clearance of 99mTc-FM-2.  
        关键词：Synaptotagmin I;Apoptosis;Technetium;Biodistribution   
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        发布时间：2021-03-12
      • CHEN Bingzhou1,2 HOU Qing1 1
        Issue 8, (2007)
        摘要：With accurate calculation algorithms in inverse planning for beamlet-based intensity modulated radiotherapy (IMRT), it takes time to calculate the dose matrix, which represents the dose distribution of each beamlet element to each voxel for unit fluence. To reduce the calculation time, coarse or approximate algorithms are often a choice, but this results in a final dose distribution that cannot reflect the real value. In addition, it is necessary to test if a coarse algorithm is capable of calculating the dose matrix of beamlets. In this work, simulated dynamics optimization algorithm was applied to optimize the segment weight to minish the dose error from the dose matrix calculation. After calculating the dose matrix by ray-tracing algorithm which takes into account just the primary component of absorbed dose, the original beam profile intensity distribution was optimized by using the simulated dynamics algorithm. Before segmentation, the even-spaced algorithm and genetic algorithm were applied in clustering. The dose distribution of every segment was calculated accurately by using convolution-superposition algorithm, and the weight of any voxel was in inverse proportion to the voxel number of the PTV or OAR it belonged. The segment weight was optimized by using the simulated dynamics algorithm. By comparing the dose distributions before and after optimization of segment weight, one finds that the dose distribution is improved obviously., It was also found that some segments which contained fewer beamlets or lower weight value could be omitted because the decay of dose distribution could be improved by re-optimizing the segment weight, and that some segments could be omitted by re-optimizing the segment weight during the process of beamlet-based IMRT.  
        关键词：Segment weight;Simulated dynamics;Optimization;Intensity modulated radiotherapy   
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        发布时间：2021-03-12
      • ZHU Ying1,2 RAN Tiecheng1,2 LI Yuguo1 LI Wenxin1 1
        Issue 8, (2007)
        摘要：The uptake of multi-walled carbon nanotubes(MWNTs) by Tetrahymena pyriformis was observed with optical microscope. The viability of Tetrahymena pyriformis and its dose-effect relationship at various concentrations of the MWNTs were measured. The result revealed for the first time that MWNTs exhibited a dose-dependent growth stimulation to the cells. The rapid proliferation of cells was further confirmed by levels of the succinate dehydrogenase (SDH),protein and nucleic acid content per 104 cells of control and treated groups. TGA analysis showed the nonspecific binding of proteose peptone to the MWNTs. Thus we proposed that a great deal of proteose peptone, carried by MWNTs inside the cells, might be a result of the rapid proliferation of Tetrahymena pyriformis.  
        关键词：Tetrahymena pyriformis;MWNTs;Stimulation;Viability;Proteose peptone   
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        发布时间：2021-03-12
      • LIN Guifen1,2 LUO Limin2 1
        Issue 8, (2007)
        摘要：The bremsstrahlung spectra of 4MV,10MV and 15MV medical linear accelerators are reconstructed respectively by BiConjugate Gradients(BiCG)method. In order to test the validity and reliability of the BiCG method, the bremsstrahlung spectra simulated by Monte Carlo (MC)method are used as the theoretical spectra. The results of the reconstructed spectra using BiCG and using spectral vectorial algebra (SVA) method are compared with each other. When there is no measurement error or the Signal-to-Noise(SNR) of transmission coefficient is higher within the energy of 4—15MeV, the results show that the bremsstrahlung spectra reconstructed by BiCG are in better agreement with the the theoretical spectra than those reconstructed by SVA. When the SNR of transmission coefficient drops down, the bremsstrahlung spectra reconstructed by BiCG become instable while those reconstructed by SVA are stable.  
        关键词：Bremsstrahlung spectral reconstruction;Spectral vectorial algebra (SVA) method;BiConjugate Gradients (BiCG)method   
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        发布时间：2021-03-12
      • ZHANG Yong1 CHEN Weizhen1 LU Hanping2 LIANG Changsheng2 LIU Changzheng2 1
        Issue 8, (2007)
        摘要：To investigate radiolabeled monoclonal antibody 7E11C5.3 against human prostate cancer with 188Re and its biodistribution, 188Re-7E11C5.3 was prepared by direct 2-mercaptoethanol-reduction method. Labeling efficiency was measured by paper chromatography. Biodistribution of 188Re-7E11C5.3 was studied in nude mice xenografted with human prostate cancer. The labeling yield of 188Re-7E11C5.3 was 93.16±2.18%. The immunoreactive fraction of 188Re-7E11C5.3 was 74.86±1.86%. After 188Re-7E11C5.3 was injected through tail vein of nude mice, the tumor’s uptake peak time was at 24h, while high uptake in non-tumor tissues was observed at 4h. With time elapsed, the uptake gradually decreased. The blood clearance was rapid. The highest T/NT (radio counts of tumor vs non-tumor tissue) was observed at 24h, and high T/NT was kept till 72h. In conclusion, 188Re-7E11C5.3 can be located to xenografted human prostate cancer in vivo and can be used for the study of radioimmunoimaging and radioimmunotherapy.  
        关键词：Prostatic neoplasms;Antibody;Monoclonal;Rhenium-188   
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        发布时间：2021-03-12
      • ZHOU Weijian1,3 LU Xuefeng1,3 WU Zhenkun1,2 ZHAO Wennian1,3 HUANG Chunhai1,3 LI Linglang1,3 CHENG Peng1
        Issue 8, (2007)
        摘要：The Institute of Earth Environment of the Chinese Academy of Sciences and Xi’an Jiaotong University have jointly created an AMS center, under the support of Ministry of Science and Technology, Chinese Academy of Sciences and Ministry of Education. The Xi’an 3MV multi-element AMS system will be a national experimental platform for earth environmental studies, archeology, biomedical research and other fields related to the AMS technique. This paper describes the AMS’s major components with their unique features,including body grounded ion source accepting both CO2 and solid samples; low energy injector with precisely timing and fast switching;low radiation accelerator containing the accelerator tubes with combined magnetic permanent and declined electrostatic field suppression of secondary electrons; high energy analyzing system with high dispersion and slit stabilization. The excellent results of the acceptance tests for 10Be, 14C, 26Al and 129I are listed. The 14C precision of 0.2% and the background for ratio 10Be/9Be of 3.65×10-15 were demonstrated.  
        关键词：Xi’an-AMS;Precision;Background;Accelerator;MAS spectrometer   
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        发布时间：2021-03-12
      • XIAN Ze LIU Shubin AN Qi
        Issue 8, (2007)
        摘要：This article describes the preamplifier of the time-of-flight detector in BES Ⅲ, including the design principle, structure feature, performance parameter and burn-in test of the preamplifier. The preamplifier takes an important role in the 25ps time resolution of the TOF electronics system; moreover the preamplifier accomplishes high bandwidth, high gain and large dynamic range. In order to eliminate the infant mortality and freak failures, which correspond to failures introduced by PCB assembly process and premature component failure of manufactured parts respectively, each preamplifier came through the burn-in test which is introduced in this paper. The preamplifier was verified by the BES Ⅲ headquarters.  
        关键词：BES Ⅲ;Time of flight;Preamplifier;High speed analog amplifier   
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        发布时间：2021-03-12
      • MA Qiang ZHAO Yuhan LI Lincun XIA Weidong
        Issue 8, (2007)
        摘要：Diameter of gliding arc driven by magnetic field at different arc currents (0.7A to 1.0A) and magnetic inductances (0.32T to 0.8T) was measured by using a multiplier phototube. For a constant arc current, the diameter decreased with increasing magnetic induced-intensity and tends to a constant. The diameter was at 0.78mm and 0.88mm, respectively, for arc current of 0.7A and 1.0A. According to signals of the multiplier phototube, the arc section is described, too.  
        关键词：Gliding arc driven by magnetic field;Multiplier phototube;Lateral diameter   
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        发布时间：2021-03-12
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