最新刊期
      卷 0 ， 期 0 ， 2020
      • ZHOU Aiyu SHU Hong
        Vol. 34, Issue 11, (2011)
        摘要：In this paper,we report a mirror box platform for controlling the beamline mirrors in visual and remote mode at Beijing Synchrotron Radiation Facility(BSRF).The platform is based on Client/Device Server structure and,to ensure the safety,only the clients examined by Server can access the devices.The 3D mirror adjustments and simple ASCII message protocol are designed for implement of the platform control in visual and remote mode.Test results show that the time to update the position status is 0.2 s and the position error in visual control is less than 5%.The performance meets requirements of the mirror box control in BSRF beam lines.By increasing the device drivers in the server and developing programs in the clients,the platform can be used to control the whole beam line.  
        关键词：Mirror box;Simple ASCII message protocol;Control in visual and remote mode;BSRF   
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        发布时间：2021-03-05
      • WANG Hongchao GUO Huiping XU Zhilin ZHANG Lei
        Vol. 34, Issue 11, (2011)
        摘要：Solid track spark counting is a convenient way to investigate the best etching condition of polyester-films.In this work,polyester films in thickness of 12 were etched in KOH solution in three groups of etching conditions,in term of the temperature,KOH concentration and etching hours.By comparing the spark counting curves,it was decided that the 12-μm thick polyester films could be etched best in a 6 mol/L KOH solution at 60oC for 3 h.  
        关键词：Polyester-film;Etching;Track;Spark counter   
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        发布时间：2021-03-05
      • XU Fayue1,3 LU Wu1,2 WANG Yiyuan1.2.3 XI Shanbin1.2.3 LI Ming1,3 WANG Fei1,3 ZHOU Dong1,3 1
        Vol. 34, Issue 11, (2011)
        摘要：Three types of PNP bipolar operational amplifiers were irradiated under forward bias and zero bias,and high temperature annealing accelerated evaluation methods were investigated.The results show that multiplying a certain factor to the results from high temperature annealing of the irradiated devices,the effect of enhanced low dose radiation sensitivity(ELDRS) can be better simulated,and occurrence of the ELDRS can be judged from the curves.  
        关键词：PNP input bipolar operational amplifiers;γ-irradiation;ELDRS;Accelerated simulation method   
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        发布时间：2021-03-05
      • SONG Pengcheng1 LU Shuyu2 LUO Lijuan2 1
        Vol. 34, Issue 11, (2011)
        摘要：In this paper,we give a review on radiation degradation of dyes wastewater.The mechanisms,influencing factors and engineering applications are described in detail.Irradiated dye solution products ?OH,eaq– and H? which have very high activity to react with dye molecules,making "-N=N-" and "-C=C-" brand fractured.?OH is a strong oxidant and can oxidize dye molecules.eaq– is a very strong reducing agent and effective decolorant,but it is less active in further degradation of the products formed.Among the influential factors of the radiation dose,pH value,oxygen level,addition of H2O2,oxidation and reduction conditions,ion species and dye molecules in solution,the ultimate degradation of dye wastewater mainly depends on structure of dye molecules and radiation dose,adding H2O2 to dye wastewater appropriately play a synergistic effect on the degradation.  
        关键词：Radiation degradation;Dye wastewater;Decoloration;Mechanism   
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        发布时间：2021-03-05
      • SONG Yeping1 WANG Chuanxian2 HUANG Fan1 YANG Zhenyu2 ZHONG Weike3 GENG Jinpei4 LU Di4 DING Zhuoping1 1
        Vol. 34, Issue 11, (2011)
        摘要：Electron spin resonance(ESR) signals were detected from irradiated polypropylene,which is widely used as packing material of food products.Optimum conditions were investigated for identifying irradiated food indirectly using ESR spectroscopy.From the ESR spectra,the g1,g2 and g3 factors for irradiated polypropylene were 2.0350±0.0002,2.0089±0.0002 and 2.0052±0.0002,respectively.ESR intensity of irradiated polypropylene was positively correlated with microware power,modulation amplitude and absorbed dose,and the detection limit was 0.5 kGy within 30 days post irradiation.The study provides a basis for identifying irradiated food products packed by polypropylene.  
        关键词：Electron spin resonance;Polypropylene;Microware power;Modulation amplitude;Absorbed dose   
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        发布时间：2021-03-05
      • ZHAO Yungang WANG Shilian LI Qi JIA Huaimao ZHANG Xinjun FAN Yuanqing WANG Jun
        Vol. 34, Issue 11, (2011)
        摘要：In xenon activity measurements,the self-absorption diversity among different samples should be well corrected.In this regard,MCNP simulation was performed with a β-γ coincidence detector model.The detection efficiencies were obtained for xenon samples in different volumes,and self-absorption coefficients were calculated using the efficiencies.  
        关键词：Self-absorption;Detection efficiency;β-γ coincidence system;Xenon isotope   
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        发布时间：2021-03-05
      • TIAN Zining1,2 OUYANG Xiaoping1,2 HUANG Xiongliang2 ZHOU Chongyang2 ZHANG Yang2 SHEN Maoquan2 YANG Xiaoyan2 1
        Vol. 34, Issue 11, (2011)
        摘要：Using a HPGe system,γ-ray detection efficiency of 241Am,137Cs and 60Co in mixed point sources places at different radius positions in empty sample boxes of different heights were obtained.The peak efficiency function parameters of the point sources were determined by least-squares fitting method.The 81.0,160.6,163.9,233.2,249.8,526.6 keV γ-ray detection efficiencies of Φ63.50 mm×16.66 mm xenon samples were obtained by numerical integration.This method was used to calculate activity of collected xenon samples.The results were,compared with those by Monte Carlo simulation and ?-? energy coincidence measurement,and the deviation were within 7%.  
        关键词：Point source efficiency function;Full-energy peak efficiency;Gaseous sample;Xenon   
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        发布时间：2021-03-05
      • LIU Zhimin HU Chundong LIU Sheng JIANG Caichao SONG Shihua XIE Yahong SHENG Peng EAST NBI team
        Vol. 34, Issue 11, (2011)
        摘要：For the neutral beam injector(NBI) of the Experimental Advanced Superconducting Tokamak(EAST),a test stand of a high-current ion source has been in construction.The NBI power supply system includes the plasma generator power supply,plasma electrode power supply,high voltage power divider,negative high voltage power supply,and the transmission lines and the snubber.A multi-megawatt prototype ion source was developed.The arc discharge of the prototype ion source was obtained in the test.The test results for the ion source power supplies and the arc discharge of the ion source are presented.  
        关键词：Neutral beam injector;High current ion source;Arc discharge   
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        发布时间：2021-03-05
      • BAI Yun1 SHUAI Zhenqing2 ZHU Xiaohong1 YANG Guangwen1 LIAO Junsheng1 1
        Vol. 34, Issue 11, (2011)
        摘要：The sorption and migration behaviors of uranium in soils and cement were studied by column test.The results show that the sorption ratio of soil is bigger than that of cement.Specific radioactivity of 235U in the soil and cement samples is basically the same as that of environmental soil,and specific radioactivity of 235U varies little with the sampling depth.The results should provide valuable information to nuclear facility decommissioning.  
        关键词：Uranium;Sorption;Migration   
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        发布时间：2021-03-05
      • ZHANG Jinming1 ZHANG Xiaojun1 ZHANG Baoshi2 LIU Jian1 WANG Hui1 SUN Zhijun1 TIAN Jiahe1 1
        Vol. 34, Issue 11, (2011)
        摘要：18F-Pen-peptide was synthesized automatically in a PET-MF-IT-1 module using "click chemistry".18F-fluoropentyne was synthesized in reactor No.1 and distilled into reactor No.2,which was pre-loaded with peptide-N3,sodium ascorbate,and CuSO4/TBTA.After reacting at room temperature,the reaction mixture was purified by semi-HPLC,and the fine product 18F-Pen-peptide was collected by solid extraction.The cell uptake of 18F-Pen-peptide in A549 lung adenocarcinoma cells,which were or were not pre-treated with a chemical drug,was determined.The results showed that the yield of 18F-fluoropentyne was 51% from 18F-fluoride(EOS).The yield of 18F-Pen-peptide was nearly 99% from 18F-fluoropentyne.The total synthesis yield was(21.0?4.5)%(n=6,EOS).The radiochemistry purity was over 99%,and the specific activity was 870 GBq/μmol,respectively.It took 70 min for 18F-Pen-peptide starting from 18F-fluoride.After chemotherapy,the A549 cells uptake of 18F-Pen-peptide were(0.86±0.04)%,and the cell apoptosis rate was(10.23±2.43)%.The control A549 cells were(0.06±0.01)%,and the cells apoptosis rate was(1.02±0.31)%.The novel radiotracer 18F-Pen-peptide is a promising candidate for future apoptosis imaging in clinical settings.  
        关键词：Auto-synthesis;Click chemistry;Imaging of apoptosis;Positron emission tomography(PET)   
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        发布时间：2021-03-05
      • SONG Jian1,2 QI Yujin1 ZHAO Cuilan1,2 1
        Vol. 34, Issue 11, (2011)
        摘要：In this paper,a high-performance data acquisition system is designed for a portable compact gamma camera.Based on a generic USB interface with modular design and system integration,it uses high-speed USB-ADC(DT9836) with NI LabVIEW software development platform to achieve simultaneous multi-channel data collection,processing,image display and record for the high-resolution gamma camera.Test results show that this data acquisition system can achieve a sampling rate of up to 200 K/s,well meeting the requirements of a high-resolution portable gamma camera.  
        关键词：Portable;Data acquisition system;Gamma camera;LabVIEW   
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        发布时间：2021-03-05
      • MENG Xiangting LI Dongcang YANG Lei HONG Pengfei FU Tingyan QI Zhong
        Vol. 34, Issue 11, (2011)
        摘要：In a multi-wire proportional chamber,the delay time of signal generated by an incident particle in the anode wire is relative to the initial position of ionization.In this paper,we report a multi-wire proportional chamber readout electronics system based on delay-line method,with detailed descriptions of the delay-line structure and calculation of delay cell parameters.The delay circuit simulation and actual measurement results are shown to verify the feasibility and superiority of this method.  
        关键词：Multi-wire proportional chamber;Delay-line;Transmission line;Matching impedance   
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        发布时间：2021-03-05
      • LU Zhaohui ZHOU Jianming Lü Yonghong XIANG Wenyuan BAI Bing
        Vol. 34, Issue 11, (2011)
        摘要：At Ling’ao Nuclear Power Plant phase I,a 1000 MWe PWR,the control rod drive mechanism(CRDM) has been improved in the design,with some material substitutions and simplification of the manufacturing technology.The new design solved the problem of Ω-type weld leakage in upper part of the CRDM,and mechanical movement delay problem caused probably by friction between the spring and movable components.Step loss occurred during a function test of the prototype CRDM under atmospheric pressure and ambient temperature.This was analyzed and a further solution was employed.  
        关键词：Control rod drive mechanism;Prototype research and development;Function test;Step-loss   
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        发布时间：2021-03-05
      • ZHOU Cheng ZHANG Qihong JIANG Yunping WANG Lihua SUN Lianjun
        Vol. 34, Issue 11, (2011)
        摘要：In this paper,nuclear accident monitoring with aerosol samples is discussed,from the sample collection and measurement,and solutions to some existing issues are proposed.Also,the inhaled effective dose of the radioactive aerosol is evaluated,in an attempt to improve the aerosol monitoring.  
        关键词：Radioactive aerosol;Monitoring;Sampling;Quality assurance;Effective dose of inhaled   
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        发布时间：2021-03-05
      • OU Pin ZHOU Jianliang ZUO Guoping GUO Pengwei
        Vol. 34, Issue 11, (2011)
        摘要：Direct charge nuclear battery(DCNB) has a low efficiency in converting decay energy into electrical power.In this paper,by analyzing structure and working principle of a DCNB,we give its equivalent circuit,from which the charge function and simplified models of DCNB in different load resistance conditions are obtained for calculating the battery output power.The maximum output power and voltage-current curve of simplified model agree well with the measured data in Ref.[2].Methods of choosing suitable load and increasing charge current for improving energy conversion efficiency of DCNB are presented.And discusses are given for optimizing the source efficiency and geometrical factor,and for reducing the secondary electron effect on the chare current.  
        关键词：Direct charge nuclear battery;Simplified models;Output power;Energy converting efficiency   
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        发布时间：2021-03-05
      • LONG Fei1 WANG Chummei 1 SUN Jielin 1 HU Jun 1,2 1
        Vol. 34, Issue 11, (2011)
        摘要：Under ambient conditions,thermal drift would limit positioning precision of an AFM tip,resulting in distortion of the scanned image.To remove this kind of imaging error,we developed a thermal drift compensation method based on image registration techniques.The image distortion can be efficiently removed,and the sample topography can be truly restored.  
        关键词：Atomic Force Microscope;Thermal Drift;Image Correction   
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        发布时间：2021-03-05
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