最新刊期
      卷 0 ， 期 0 ， 2020
      • YUAN Qingxi HUANG Wanxia HONG Youli ZHANG Kai WANG Zhili ZHU Zhongzhu ZHU Peiping WU Ziyu
        Vol. 33, Issue 10, (2010)
        摘要：In order to offer 5–12 keV X-rays for an imaging system of 30 nm spatial resolution,a nano-imaging beamline was designed and constructed. The beamline adjustment and test were finished,and it has been in use since then. The adjustment and test process was given in detail in this paper. The test results show that the design specifications were achieved,and the beamline meets requirements of the nano-imaging system.  
        关键词：Synchrotron radiation;Nano-imaging;Beamline;On-line adjustment and testing   
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        发布时间：2021-03-05
      • FU Yuan ZHU Wanqian XUE Song
        Vol. 33, Issue 10, (2010)
        摘要：In this article,we report the development of mirror manipulator systems in SSRF. The function,bending types and actuating mode of the mirror manipulator systems were introduced. Emphases are paid on mechanical design of the jack mode mirror manipulator system,analysis of the mirror slope error,and the method to reduce the slope error. Results of the test and simulation of the mirror radius are given,including the requirements and test results of the manipulator systems.  
        关键词：Mirror manipulator system;Slope error;Gravity compensation;Bend radius   
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        发布时间：2021-03-05
      • GAO Nan ZHU Xiaoli Li Hailiang Xie Changqing
        Vol. 33, Issue 10, (2010)
        摘要：The techniques to make X-ray spiral zone plates using electron beam and X-ray lithography were studied. A master mask was fabricated on polyimide membrane by E-beam lithography and micro-electroplating. Spiral zone plates were efficiently replicated by X-ray lithography and micro-electroplating. By combining the techniques,spiral zone plates at 1 keV were successfully fabricate. With an outermost zone width of the 200 nm,and the gold absorbers thickness of 700 nm,the high quality zone plates can be used for X-ray phase contrast microscopy.  
        关键词：Spiral zone plate;Electron beam lithography;X-ray lithography;X-ray imaging   
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        发布时间：2021-03-05
      • LAI Longwei1,2 LENG Yongbin1 YAN Yingbing1 YANG Guisen1,2 YI Xing1,2 ZHANG Ning1,2 1
        Vol. 33, Issue 10, (2010)
        摘要：Beam position monitor (BPM) is an important part of beam instrument system,and the algorithm study is of significance to development of a digital BPM system. In this study,with the digital signal process board ICS-1554A-002 (GE Corp.),raw data from the SSRF storage ring,and a signal generator,were sampled,and processed off line on Matlab. Sum-difference algorithm was applied to the turn-by-turn beam position processing. Based on the Software Radio Theory,three down frequency algorithm were designed,i.e. multilevel decimation,single level decimation and the special algorithm with FFT (Fast Fourier Transform). For each algorithm,the theories and results are discussed and compared. The algorithm best fits to the turn-by-turn signal processing and FPGA implementation is acquired.  
          
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        发布时间：2021-03-05
      • NING Zhe1,2 QIAN Sen1 FU Zaiwei1,3 WANG Yifang1 HENG Yuekun1 ZHANG Jiawen1 ZHENG Yangheng2 QI Ming3 1
        Vol. 33, Issue 10, (2010)
        摘要：The compilation and encapsulation of a general data acquisition system based on VME board in WinXP environment was developed using LabVIEW with graphics interface. By integrating the emulational instrument panel of LabVIEW and calling the Dynamic Link Libraries (DLLs) of crate controller,the VME modules were encapsulated into function modules independently,for convenience of use. The BLT,MBLT and CBLT readout modes for different VME boards were studied. The modules can be selected and modified easily according to the requirements of different tests. Finally,successful applications of the high resolution data acquisition software (DAQ) in several experiment environments are reported.  
        关键词：VME;LabVIEW;DAQ   
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        发布时间：2021-03-05
      • LIU Cunxiong HU Lian NI Bangfa TIAN Weizhi FAN Qiwen XIAO Caijin NIE Peng WANG Pingsheng ZHANG Guiying HUANG Donghui
        Vol. 33, Issue 10, (2010)
        摘要：Nanometer materials are of importance in developing electromagnetic-wave-absorbing materials. In this work,16 μm thick polyester membranes were bombarded by 140 MeV 32S ions from the HI-13 tandem accelerator to produce latent tracks. The bombarded samples were sensitized by DMF and UV light at 360 nm wavelength,before chemical etching by NaOH solution to develop latent tracks into pores in sizes of nanometers or micrometers in full depth of the membrane. The samples were coated with thin layers of barium ferrite and magnesium fluoride by vacuum evaporation. The reflectivity indices were measured at 2–18 GHz. The results indicate that the modified polyester membrane can effectively absorb 8–18 GHz radar waves.  
        关键词：Nuclear track;Magnesium fluoride;Barium ferrite;Electromagnetic-wave absorbing materials   
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        发布时间：2021-03-05
      • ZHANG Jianfu CHEN Liang LI Hongyun XIA Liangbin ZHANG Xiaodong ZHANG Xianpeng LIU Linyue LIU Jinliang
        Vol. 33, Issue 10, (2010)
        摘要：Scintillation detectors based on neutron time-of-flight (nTOF) were developed for pulsed neutron yield and waveform measurements of dense plasma focus (DPF) device. The neutron sensitivity of ST401 plastic scintillation detector was calibrated by current mode and modified by using nTOF method with 3.02 and 14.97 MeV pulsed neutrons produced from D(d,n)3He and T(d,n)4He reactions on the neutron generator at China Institute of Atomic Energy. It was also modified by using the neutron response function obtained with Monte-Carlo simulation. Using the scintillation detectors,the parameters of DPF such as D-T neutron yield and waveform were measured and discussed. Neutron yield ranges of DPF measured were 1×109–2×109 n/shot,with an FWHM of about 9 ns.  
        关键词：DPF device;Neutron time-of-flight;Plastic scintillation detector;Neutron yield;Sensitivity   
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        发布时间：2021-03-05
      • DOU Haifeng TANG Bin WU Yang
        Vol. 33, Issue 10, (2010)
        摘要：A key point of fast neutron radiography (FNR) is to decrease the effect of scattered neutrons on the imaging. This gives a preferable design of a shielding collimator system for FNR with a D-T neutron source. M-C simulation results showed that the neutrons scattered from the walls could be decreased to about one tenth,and the effect of contrast distortion induced by scattered neutrons was greatly reduced. And intensity of the fast neutron source increased by 20%.  
        关键词：Fast neutron radiography (FNR);Scattered neutrons;D-T neutron source;Shielding collimator system   
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        发布时间：2021-03-05
      • WANG Liyan LI Min WU Zhangwen GOU Chengjun HOU Qing
        Vol. 33, Issue 10, (2010)
        摘要：In intensity modulated radiation therapy (IMRT),an approach to generate uniform photon beams is to use electron pencil beams to bombard a set of points that are discretely arranged on the target. It was considered that the E-beam energy in this technique should be greatly higher than that those from accelerators commonly available for radiation therapy. In this study,Monte Carlo simulation was used to explore the possibility of generating the needed photon fluence distribution by using a common medical accelerator. The fluence distributions produced by electrons pencil beam in different energies were compared. Optimal target materials,and the geometry,were determined. The photon fluence distributions of wide fields at various target point intervals were simulated for suitable density of the target points. Two fluence distributions in common request by conventional IMRT were taken as examples to show that the desired fluence distributions could be achieved by optimizing the intensity of electron beam on target points.  
        关键词：Electromagnetic scanning;IMRT;Optimization;Fluence   
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        发布时间：2021-03-05
      • YIN Lei TAO Jie SU Xinqing LIU Hongbing XU Jiang
        Vol. 33, Issue 10, (2010)
        摘要：Al-Cr-Si oxide coatings were prepared on 316L stainless steel by double glow plasma surface alloying technique in order to promote the capability against tritium permeation. Microstructures and compositions of the coatings were studied by scanning electron microscope,transmission electron microscope and X-ray diffraction. Adhesion strength of the oxide coatings was tested by scratch adhesion test and thermal shock test. The results showed that dense and continuous Al2O3 films were formed on the substrate owing to the addition of elements Cr and Si. Besides,the spinel-type composite metal oxide Fe(AlCr)2O4 was formed of Al2O3 and iron/chromic oxide in the outer layer. The coatings prepared at oxygen flow rate of 10 standard cubic centimeter per minute exhibited the best microstructure and mechanical properties with a bonding force of 68 N. No cracks were found in the coatings after thermal shock testing.  
        关键词：Tritium penetration resistance;Double glow plasma surface alloying technique;316L stainless steel;Al-Cr-Si oxide coatings   
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        发布时间：2021-03-05
      • LIU Haikuan WU Jinhai GU Naigu GAO Yiming WANG Li HUANG Weiqin WANG Fengxian
        Vol. 33, Issue 10, (2010)
        摘要：In this paper,we calculate and evaluate the room shielding thickness of a Hi-Art tomotherapy system,which is a new type of radiotherapy facility. Due to the self-shielding of the accelerator,only scattered beam and beam leakage were considered in calculating the room shielding thickness. The radiation field of the tomotherapy system was used as the basic data to calculate the shielding thickness of every 15o solid angle. The maximum shielding thickness required of each shielding wall was at the position with the angle of 15o,and the calculated shielding thickness were 1023,975,917,1460,1147 and 1189 mm for the east wall,south wall,west wall,north wall,the roof and the floor,respectively. According to the calculation results,all shielding walls,ceiling and floor could meet the requirement of the radiation protection,but the north wall thickness of 1200 mm was a little thinner.  
        关键词：Hi-Art tomotherapy system;Shielding calculation;Radiation protection   
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        发布时间：2021-03-05
      • LIU Xiaoyan1,2 CHEN Jiansheng 1 TAN Hongbing1 SUN Xiaoxu3 SU Zhiguo1 1
        Vol. 33, Issue 10, (2010)
        摘要：Based on stable isotopic mass balance and water balance,a stable isotopic model is built. According to the measured stable isotopic data and relevant hydro meteorological data of the Yamzho Lake,the mean leakage is calculated by the stable isotopic model. Factors affecting the lake water leakage are discussed,too. If the factors do not change,the δ18O depletes more with the water leakage. The result shows that leakage is 30.6% of the recharge rate. The model has some guidance significance to study stable isotope variation of inland lake.  
        关键词：Leakage;Oxygen isotope;The Yamzho Lake   
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        发布时间：2021-03-05
      • HU Zhiliang HE Chaohui
        Vol. 33, Issue 10, (2010)
        摘要：Total ionizing dose effect on 0.25 μm SOI NMOS is simulated in this paper. The simulated I-V characteristics curves for different total doses are in good agreement with experimental data. Total ionizing dose effects for various process parameters,such as doping concentration,silicon film thickness,buried oxide layer thickness and gate oxide layer thickness,are investigated under 104 Gy(Si) total ionizing dose for SOI NMOS. The results show that SOI NMOS with heavily doped thin gate oxide layer,appropriate thickness of buried oxide layer and thin silicon film is the best tolerant. The reasons are discussed. These are of help in device hardening design against total ionizing dose effects.  
        关键词：Total ionizing dose effect;SOI NMOS;Numerical simulation   
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        发布时间：2021-03-05
      • LUO Yinhong ZHANG Fengqi GUO Hongxia YAO Zhibin ZHANG Keying WANG Yuanming
        Vol. 33, Issue 10, (2010)
        摘要：Memory radiation effect studies in China have been mainly focused on functionality measurement. According to the present situation,threshold voltage testing method was presented on Floating Gate (FG) memory. FG EPROMs of different integration scales were pre-irradiation by UV lights,followed by irradiation of 60Co γ-rays,or pulsed γ-rays. The total dose effect similarities and differences were studied. The damage mechanism was analyzed. The results showed that unlike MOS and CMOS devices,FG memory threshold voltage shifted more due to pulsed irradiation than 60Co γ-ray irradiation. This is of important reference for choosing the device type for a certain system.  
        关键词：EPROM;Threshold voltage;Pulsed total dose   
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        发布时间：2021-03-05
      • LI Rusong1 HE Bin1 YUAN Yong2 1
        Vol. 33, Issue 10, (2010)
        摘要：In this paper,molecular dynamics (MD) simulation is performed for the self-radiation effects in δ phase Ga-stabilized Pu alloys. According to atomic and molecular reaction statics,ab initio calculations was implemented on the electronic states and potentials of PuGa molecule using relativistic effective core potential (RECP) for Pu atom,and 6-311g* all electron basis sets for Ga atom with Becke-3 hybrid functional (B3LYP). The calculation results show that PuGa molecule is the most stable when it is in multiplicity 10,with the Pu and Ga atoms being in their excited state. Finally,potential data were fitted with Murrell-Sorbie two-body potential.  
        关键词：Ab initio;Multiplicity;Electronic state;Atomic and molecular reaction statics   
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        发布时间：2021-03-05
      • HAO Kuihong1 FENG Xiangguo1 CAO Yongna1 MA Min1 WANG Huaxiang2 1
        Vol. 33, Issue 10, (2010)
        摘要：Based on the theory of Compton scattering array detection,simulations using MCNP were performed for improving the efficiency and quality of Compton scattering detection. The results show a good scattering detection angle and an effective range. In addition,considering features of discriminate grade CdZnTe detector array,optimized collimator structure of the detection device was designed for detecting the multi-angle scattering information,and the detection efficiency was improved with reduced interference of other scatterings.  
        关键词：Compton scattering;MCNP;Array detection;Collimator   
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        发布时间：2021-03-05
      • CAO Guoxian ZHOU Xingqin YAN Chenglong ZHANG Jiankang QIN Xiaofeng
        Vol. 33, Issue 10, (2010)
        摘要：To study the pharmacokinetics of 99mTc labeled N-[2-(N-(2-mercapotoethyl))aminoformylmethyl]-N-(2-mercapotoethyl)-3,5-dimethyladamantyl aminoacetamide (99mTc-NCAM),an N-methyl-D-aspartate (NMDA) receptor inhibitor,in brain tissues of mice,0.2 mL (7.4 MBq) 99mTc-NCAM was injected via tail vein into groups of KM mice. The mice were sacrificed by decapitation at 5,10,30,60,120 or 180 min postinjection. Pallium,striatum,hippocampus,cerebellum and thalamencephalon were collected and weighed,and radioactivities were counted. The mouse blood samples of 20 μL were taken and counted at the same time points. Pharmacokinetics of 99mTc-NCAM in blood was analyzed with a pharmacokinetics local model. 99mTc-NCAM accumulated quickly into the brain of mice after injection,and high uptake was observed in pallium and hippocampus with the maximum values of 1.51±0.13 %ID/g and 0.74±0.002 %ID/g,respectively. Theoretical calculation indicated that pharmacokinetics of 99mTc-NCAM in mice fit into a two-compartmental model,and pharmacokinetic equations and parameters of brain tissues and blood were obtained. 99mTc-NCAM can penetrate the blood-brain barrier into brain regions,and high uptakes were observed in high NMDA receptor expressing tissues such as pallium and hippocampus. 99mTc-NCAM may be a potential NMDA receptor imaging agent and could be used in diagnoses and prognosis monitoring for some neurodegenerative diseases.  
        关键词：NMDA receptor;99mTc-NCAM;Pharmacokinetics;Pharmacokinetics local model   
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        发布时间：2021-03-05
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