最新刊期
      卷 0 ， 期 0 ， 2020
      • WU Kun1,2 XUE Song1 LU Qipeng3 PENG Zhongqi3 CHEN Jiahua1 TAI Renzhong1 1
        Vol. 33, Issue 5, (2010)
        摘要：In this paper,optical layout and structure of the variable included angle plane grating monochormator(VAPGM) at Shanghai Synchrotron Radiation Facility(SSRF) is introduced,and the factors that result in light spot transversal transfer are analyzed.Numerical simulation for the deformation under loads is done by using the Ansys code,and the dispensatory errors for relevant parts of the monochromator are decided based on the simulation results.The monochromator structure has been designed according to the dispensatory errors.After installation,the monochromator,was tested,and the transversal angle transfer repeatability was 0.7″.  
        关键词：Variable included angle plane grating monochormator;Light spot transfer;ANSYS;Numerical simulation   
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        发布时间：2021-03-05
      • HE Xiaoye1 WU Jun2 1
        Vol. 33, Issue 5, (2010)
        摘要：In this paper,we discuss the technical problems during installation and debugging of the hydrostatic leveling system(HLS) established on the linac,booster and storage ring of Shanghai Synchrotron Radiation Facility(SSRF),and the ways to solve the problems.Before the system installation,all the sensors were tested to exclude anyone that failed,because of the reasons of transportation,to meet the accuracy requirement of the SSRF design.The test method and test process are given in detail.During the process of HLS system installation,we solved a number of problems that could not be anticipated,e.g problems of the supports and water supplying.The surveying results after system installation show that the system works normally and satisfies the designing requirement.  
        关键词：Hydrostatic leveling system;Installation;Debugging;System   
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        发布时间：2021-03-05
      • WU Xuehui GAO Zhenhua JIN Yalan FU Yongli
        Vol. 33, Issue 5, (2010)
        摘要：A computer monitoring system was designed to provide a safe,reliable and stable environment for the beamline users through monitoring and controlling the public equipment of BSRF,detecting fault and giving the alarm timely.The lower-level system mainly uses PLC,and the upper-level system is mainly based on FIX.The control system,which is highly flexible and scalable,has been running stably and reliably,supporting the facilities very well.  
        关键词：SCADA;Control system;Synchrotron radiation;FIX   
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        发布时间：2021-03-05
      • ZHANG Yanle YU Xiaohan
        Vol. 33, Issue 5, (2010)
        摘要：In this paper,we give an introduction first to two quantification methods for synchrotron radiation X-ray fluorescence analysis(SRXRF),namely fundamental parameters method and Monte-Carlo simulation method,for their application on the BL15U1 beamline(hard X-ray microprobe) at SSRF(Shanghai Synchrotron Radiation Facility).Effectiveness of the two methods is demonstrated and the XRF detection limits of the BL15U1 beamline are calculated.The results show that,quantitative analysis at the ppm level can be done using the two methods,with an accuracy of better than 10%.Although both the methods are valid for the SRXRF data analysis,the Monte Carlo method gives better analysis result,as it compares the simulated spectrum with the experiment spectrum,and this helps the determination of experiment parameters and thus minimizes the error caused by incorrect parameters.Finally,the detection limits shows that the BL15U1 beamline is capable of carrying out standard-of-the-art XRF experiment.  
        关键词：Synchrotron radiation X-ray fluorescence analysis;Fundamental parameters method;Monte Carlo simulation method   
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        发布时间：2021-03-05
      • WANG Xianggao1 HE Ming1 LI Shizhuo1,2 DONG Kejun1 XIAO Caijin1 JIANG Shan1 1
        Vol. 33, Issue 5, (2010)
        摘要：With the availability of 177Lu with highly specific activities and its major γ-ray of 208.3 keV,which is very close to that from 237U(208.000 keV),we developed a simple method to make an accurate correction for severe self-absorption of the 237U γ-ray.Summing effects from cascade γ rays were avoided by careful arrangement of counting geometry that made the effects negligible.This method is feasible for the determinations of emission rates of low energy γ-rays in high Z matrix samples.  
        关键词：177Lu-U method;Self-absorption correction;Emission rate of γ rays   
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        发布时间：2021-03-05
      • LIU Cheng1 WANG Dezhong1 LI Houwen2 BAI Yunfei1 QIAN Nan1 ZHANG Kuo1 ZHANG Jige1 1
        Vol. 33, Issue 5, (2010)
        摘要：The equivalent radius of source in a waste drum was determined based on counting rate ratio of two detectors located at off-center positions.The experimental data of a non-uniform sample was presented and compared to that of conventional SGS.The results confirm that the analysis errors are reduced greatly by the technique proposed.  
        关键词：Segmented gamma scanning;Detection efficiency;Equivalent radius   
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        发布时间：2021-03-05
      • WANG Yuxin 1,2 DENG Wen 2 YAN Biao 1 DONG Gang 1 LI Xiang 1 1
        Vol. 33, Issue 5, (2010)
        摘要：The effects of light illumination and heat treatment on the micro-defect and electricity output character of Cz-silicon solar cells have been studied by using coincidence Doppler broadening spectra of positron annihilation.The results showed that the conversion efficiency of solar cell decreased gradually with the light exposure time increasing,and then reached a constant value after irradiating more than 12 hours.When irradiated samples annealed at 200℃ for 2 hours,the conversion efficiency would recover gradually.The metastable boron-and oxygen-related defects center in samples which activated by light illumination and inactivated by thermal treatment caused the change of conversion efficiency and the variation of ratio curves.  
        关键词：Cz-silicon solar cells;Coincidence Doppler broadening spectrum;Boron-and oxygen-related defects   
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        发布时间：2021-03-05
      • LU Dong1,2 WANG Ying1,3 LIU Qingfang1,2 WU Xin1,2 WANG Jufang1 MA Shuang1 LI Wenjian1 1
        Vol. 33, Issue 5, (2010)
        摘要：The yeast Saccharomyces cerevsiea YY was irradiated with 100 MeV/u 12C6+ ion beams.After screening,we obtained the mutant strain C03A of high ethanol yield.The influence of fermentation temperature,pH and concentration of sugar on ethanol fermentation were studied.The range analysis and analysis of variance were applied for the result of orthogonal experiments.The optimal ethanol fermentation conditions are:fermentation temperature 35°C,pH value 5.0,and sugar concentration 24%.The results of fermentation in the 10 L bioreactor showed that the ethanol fermentation of the mutant strain could be completed in 36 hours,the production of ethanol was to 13.2%(V/V),which means 12 hours faster and 1.6%(V /V) ethanol yield higher than original strain.  
        关键词：Heavy ion beam;Yeast;Ethanol fermentation   
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        发布时间：2021-03-05
      • JIANG Tao1 YANG Tongzai1 YANG Jun1 TUO Fei2 YANG Liang1 1
        Vol. 33, Issue 5, (2010)
        摘要：The method of solid-phase synthesis of HfF4 for AMS measurement was researched in this paper.After separation and purification progress,the HfO2 sample was made to HfF4 which was measured by AMS with NH4HF2 by solid-phase reaction.The results show that the extraction of α-benzoin oxime was an important step for decreasing the 182W content.The beam flux of 180HfF5? in HfF4 made by solid-phase synthesis was three to four times higher than that made by liquid-phase synthesis at the same condition.The sample preparation methods(solid-phase synthesis or liquid-phase synthesis) have little impact on the ratio of 182W/Hf.The ratio of 182W/Hf in HfF4 was as low as 10?11 g·g?1.  
        关键词：182Hf;Accelerator mass spectrometry;182W;HfF4;Solid-phase synthesis;Sample preparation   
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        发布时间：2021-03-05
      • ZHENG Yuzhan1,3 LU Wu1,2 REN Diyuan1,2 WANG Yiyuan1,3 CHEN Rui1,3 FEI Wuxiong1
        Vol. 33, Issue 5, (2010)
        摘要：High-or low-dose-rate irradiation was performed on JFET-input operational amplifiers(op-amps) under normal operating or zero-biased conditions.The results show that operational conditions have a great influence on the radiation effects and damage to JFET-input operational amplifiers.Under normal condition,the JFET-input op-amps exhibited time-dependent effect(TDE);while they show enhanced low-dose-rate sensitivity(ELDRS) at zero-biased condition.Compared with zero-biased condition,the JFET-input op-amps degrade more severely at normal condition for high-dose-rate irradiation;while for the low-dose-rate case,they degraded more at normal condition.Irradiation would induce positive oxide-trapped charge and interface traps in bipolar transistors,which are the basic components in JFET-input op-amps.From the dependence of oxide trapped charge and interface traps on operational conditions,the degradation behavior is discussed.  
        关键词：JFET-input operational amplifiers;Operational condition;Zero biased condition;Radiation damage   
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        发布时间：2021-03-05
      • WEN Weiwei LI Hang WANG Sheng ZOU Yubin ZHU Kun LU Yuanrong TANG Guoyou GUO Zhiyu
        Vol. 33, Issue 5, (2010)
        摘要：Thermalization and transport of the neutrons generated from D-Be reaction were simulated using MCNP code.The source neutron energy spectrum,angular distribution and beam spot size were considered in the simulation,which shows that using a polyethylene cylinder of Φ28 cm × 28 cm as moderator and reflector can provide higher thermal neutron flux.The thermal neutron distribution changes negligibly with the radius of deuteron beam spot on the Be target when the radius is less than 1 cm.Increasing the angle between axis of collimator and axis of D+ beam tube can reduce greatly the fast neutron numbers and the γ components of imaging beam.  
        关键词：Accelerator based D-Be neutron source;Moderator;Reflector;Collimator;Monte Carlo method   
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        发布时间：2021-03-05
      • WEI Qianglin YANG Bo WANG Yi YANG Ting LIU Yibao
        Vol. 33, Issue 5, (2010)
        摘要：In this paper,boron-containing KTA-304 stainless steel for slow neutron absorption and attenuation is studied by Monte Carlo method,and compared with the traditional SUS304 stainless steel.Taking into account some factors,such as processing conditions,corrosion resistance,hot ductility,etc.we may reasonably come to the conclusion that boron content of about 1.13% in the steel has a better absorption capacity to the slow neutron and can effectively reduce the secondary γ-ray effect,meeting the request of radiation protection with reduced material thickness.Besides,slow neutron attenuation coefficient was calculated at different boron concentrations of the steel in different energies,providing a reasonable basis for selecting the neutron shielding materials.The γ-rays released in the neutron capture process were considered,too.  
        关键词：Boron-containing steel;Monte Carlo method;Neutron shielding;Attenuation coefficient   
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        发布时间：2021-03-05
      • TANG Lei LIU Xuemei LONG Kaiming LIU Zhao YANG Tianli
        Vol. 33, Issue 5, (2010)
        摘要：High precision analysis method of ng lithium by thermal ionization mass spectrometry is developed.By double-filament measurement,phosphine acid ion enhancer and sample pre-baking technique,the precision of trace lithium analysis is improved.For 100 ng lithium isotope standard sample,relative standard deviation is better than 0.086%;for 10 ng lithium isotope standard sample,relative standard deviation is better than 0.90%.  
        关键词：Lithium;Thermal ionization mass spectrometry;Fractionation   
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        发布时间：2021-03-05
      • HUANG Hongquan1,2 FANG Fang1 GONG Dichen1 DING Weicheng1 1
        Vol. 33, Issue 5, (2010)
        摘要：Based on statistical characteristics of nuclear spectrum,statistical model,namely Gaussian mixture model(GMM),was adopted for smoothing filtering of nuclear spectrum.The main idea for this method is to do function approximation of nuclear spectrum using good approximating performance of GMM,build mathematical model of original spectrum based on GMM,and realize more reasonable smoothing filtering of spectrum in the process of multiple operation by this model.  
        关键词：Nuclear spectrum;Statistical characteristics;GMM;Smoothing filtering   
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        发布时间：2021-03-05
      • ZHANG Jiamei NI Jianzhong HE Xiaobing FAN Jinlong
        Vol. 33, Issue 5, (2010)
        摘要：In order to determine quickly and conveniently several man-made radionuclides of low-level specific radioactivity in batch of powder samples,the γ spectrometry non-destructive analysis is adopted.Each sample about 1 g in weight was loaded into a custom-made plastic box,forming a small disk of Φ26 mm×3 mm.Sample boxes were measured in the lower position,about 1 cm from the HPGe detector(referred as Position H1).Without the same solid standard source for efficiency calibration,so some planar sources(in same diameter) containing many radionuclides were calibrated by standard 60Co planar source in position H25,25 cm from the detector.Then peak efficiencies for planar sources on H1 were obtained.By increasing distance 1 mm each time around position H1,planar sources were measured.Fitting the efficiency vs.distance curve,the efficiencies for disk source with thickness of 3 mm were calculated.Finally specific activities were evaluated including self-absorption correction.The differences of results between this method and radiochemical analysis are no more than 4% by just comparing two nuclides of some samples.  
        关键词：Radionuclides;γ spectrometry analysis;Total absorption detection efficiency for gamma-ray   
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        发布时间：2021-03-05
      • PENG Tao LI Liang HAN Xiaotao DING Hongfa DING Tonghai XIA Zhengcai XIE Jianfeng
        Vol. 33, Issue 5, (2010)
        摘要：A compact pulsed field generation system was developed.The system consists of a 1-mF 8-kV high energy density capacitor bank,two pulsed magnets and a control system.Fields up to 20 T and 10 T in the bore of 27 mm and 45 mm were obtained.Combining with a vacuum cryostat,the experiments on biology have been carried out at room temperature.  
        关键词：Pulsed;Magnet;High field;Compact   
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        发布时间：2021-03-05
      • GU Xizhe1,2 GUO Jianhua1 CHANG Jin1 1
        Vol. 33, Issue 5, (2010)
        摘要：In this paper,a multi-channel charge measurement circuit is implemented by using Viking Chip from IDEAS company.Its positive dynamic is from 0 pC to +13 pC and random noise is about 1.3 fC(RMS).It meets most experiment requirements.The maximum measurable signal to noise(RMS) ratio reaches 104.  
        关键词：VA32;Charge measurement;High dynamic range;Multi-channel   
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        发布时间：2021-03-05
      • LIU Suping1 HU Guangchun1 ZHANG Songbo2 HAO Fanhua1 WU Jun2 1
        Vol. 33, Issue 5, (2010)
        摘要：In this paper,we investigate validity of the mean-vector-test template match arithmetic(MTMA) with high-resolution γ-ray spectra simulated from fictitious plutonium components with different abundances of 239Pu.The trial shows that identification capability of MTMA is strongly correlated with the level of significance,and weakly correlated with the template structures given a maximum template structure.The MTMA to be used to identify genuine plutonium components would accept,at the level of significance,a certain degree of tolerance to the difference between individual components of the same type.  
        关键词：Mean vector test;Template match arithmetic;Plutonium component;Template identification technology   
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        发布时间：2021-03-05
      • HAN Jun GUAN Rui REN Xingbi HU Sheng XIONG Liangping
        Vol. 33, Issue 5, (2010)
        摘要：Properties of Pt/Al2O3 catalysts for hydrogen-deuterium exchange of methane were studied with a fixed-bed micro-reactor.The results indicated that under the same feed composition conditions,the conversion of methane increased rapidly with reaction temperature until 663 K,where it began to saturate,while it decreased with increasing flow of the reactants;at temperatures of 566-793 K,it decreased significantly with increasing ratio of HD/CH4 when HD/CH4 =1.5-2.5 and when the feed composition changed in the total flow of reactants.  
        关键词：Pt/Al2O3 catalyst;Methane;Hydrogen-deuterium exchange   
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        发布时间：2021-03-05
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