最新刊期
      卷 0 ， 期 0 ， 2020
      • LI Jitang1,2 ZHENG Lifang1 LU Chengmeng1 LIU Songqiang1 1
        Issue 10, (2005)
        摘要：This paper describes a magnet power supply control system which is based on EPICS software environment. The fieldbus DeviceNet is used for communication between Remote I/O modules and Input/Output Controller. The system has been applied in the 100 MeV Linac magnet power supply control.  
        关键词：Power supply;Control;DeviceNet;EPICS   
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        发布时间：2021-03-12
      • GU Yuehua ZHAO Yinsheng ZHAO Ling
        Issue 10, (2005)
        摘要：After wheat seeds were irradiated with different doses (0—288 J/cm2) of synchrotron radiation (SR) soft X-rays, we investigated the apoptosis phenomenon of wheat root tip cells by DAPI and TUNEL. The results show that the correlation between the apoptosis rate and the irradiation dose is positive.  
        关键词：Synchrotron radiation;Soft X-ray;Wheat root tip cells;Apoptosis;DAPI;TUNEL   
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        发布时间：2021-03-12
      • XUE Song SHAO Jinghong LU Qipeng XU Zhong WANG Zhaolan ZHAO Zhenwu WANG Liqiu TANG Yuguo
        Issue 10, (2005)
        摘要：The magnetic circular dichroism beam-line in the NSRL Phase II Project is introduced. This beam-line consists of chopper, pre-focusing mirror, monochromator, post focusing mirror, vacuum system, software and electronics system. The design goal of the beam-line is: photon flux of 108 photons/s, working energy range of 100—1000 eV, circular polarization of 0.6—0.8 (varying with wavelengh), spectral resolving power of 1000 at 1000 eV, focused spot size at the sample of 3 mm horizontally and 1 mm vertically.  
        关键词：Synchrotron radiation;Soft X-ray;Magnetic circular dichroism;Beam-line   
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        发布时间：2021-03-12
      • ZHANG Liangping YE Bangjiao CHEN Xianglei KONG Wei CHENG Mingfu WENG Huimin YANG Baozhong
        Issue 10, (2005)
        摘要：The distribution of electron momentum (DEM) in carbon allotropes was measured by Compton scattering method. Different Compton profiles in carbon allotropes were obtained. The difference of momentum distributions of the valence electrons is attributed to different crystal structures and bonding modes, and the surface effect of nanocrystalline material is distinct.  
        关键词：Compton profile;Electron momentum;Surface effect   
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        发布时间：2021-03-12
      • DU Baihe1,2 LI Lincun1 MA Qiang1 CHEN Quan1 ZHAO Yuhan1 XIA Weidong1 1
        Issue 10, (2005)
        摘要：There are many interesting physics phenomena in producing diffusing arc plasma by magnetically driven rotating arc. The large-scale arc hollow electrode plasma generator with an outer magnetic filed is designed and a photogrammetry is built to investigate the arc structure and arc movements in the argon under the atmospheric pressure with the aid of a high-speed digital camera. Typical arc structure, under arc currents and external magnetic field, is a developing and increasing spiral one, which breaks and new arc column is re-constructed as plasma jets towards the anode appearing nearby the cathode. The rotating frequency of anode spot of the arc is analyzed with statistics mean. The arc voltage fluctuation frequency resulting from arc movement is obtained by using the Fast Fourier Transform (FFT) method. The analysis results show that large voltage drop is attributed to the breaking and reconstruction of multiple layer spiral structure of the arc, and small voltage fluctuations are probably caused by arc lengthening and shortening during the arc root jumping on the anode.  
          
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        发布时间：2021-03-12
      • MOU Yanyan1 YUAN Shoujun1 CUI Lei2 YU Xin1 ZHENG Zheng1 ZHAO Yongfu3 1
        Issue 10, (2005)
        摘要：A comparative study was made about main anaerobic digestive characteristics of sludge which was subjected to a 60Co gamma-irradiation pretreatment. The results showed the gamma-irradiation pretreatment can clearly improve anaerobic digestibility of sludge and pick up the anaerobic digestion speed of sludge.  
        关键词：Gamma-irradiation;Pretreatment;Anaerobic digestion;Sludge   
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        发布时间：2021-03-12
      • LU Wu REN Diyuan GUO Qi YU Xuefeng AI Erkin
        Issue 10, (2005)
        摘要：Radiation effects and annealing characteristics have been investigated for different types of bipolar operational amplifier with JFET differential pair input at five dose rates ranging from 1 to 6.4×10-5 Gy (Si)/s for the same total doses. The results show that the effects vary with the type of devices in the given dose rates, one of which only has the time dependent effects (TDE), two of which not only have the TDE, but also the enhanced low dose rate sensitivity (ELDRS), and the last one shows that there is no difference when the IC was irradiated at different dose rates, but there exists the effect of “post-radiation damage” as annealing at room temperture. Possible mechanisms for these effects are discussed.  
        关键词：Bi-JFET op-amps;60Co γ irradiation;Dose rate effect;Annealing   
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        发布时间：2021-03-12
      • LUO Yinhong GONG Jiancheng YAO Zhibin GUO Hongxia ZHANG Fengqi LI Yonghong GUO Ning
        Issue 10, (2005)
        摘要：A pulsed total dose effect in-circuit test system based on PCI card virtual instrument was developed. Working principle and technical specifications were introduced in detail. Pulsed total dose damage and time-dependent annealing response on CMOS devices were studied by utilizing this system, including influence of different gate bias voltage on total damage and annealing behavior, as well as threshold voltage shift due to oxide trap charge and interface trap charge versus annealing time. Physical mechanism was discussed in detail.  
        关键词：Pulsed total dose;Test system;CMOS   
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        发布时间：2021-03-12
      • JIANG Quanfu WU Chunying LU Chunxiong CHEN Zhengping WANG Songpei ZHANG Tongxing LI Xiaomin ZHU Junqing
        Issue 10, (2005)
        摘要：Synthsis of a new ligand: 2-((2-((Dimethylamino)methyl)phenyl)thio)-5–iodophenylamine(125I-ADAM) as a serotonin imaging agent is reported. The radioiodinated ligand was prepared by iododestannylation reaction using hydrogen peroxide. The chemical structure of the labeling precursor (5-(tributylstannyl)-2-((2-((dimethylamino) methyl)phenyl)thio)phenylamine) and all intermediates were verified by IR, HNMR and MS. The radiochemical purity of 125I-ADAM was above 95% determined by TLC. Biodistribution studies in rats showed that the initial uptake of 125I-ADAM in the brain was high, and consistently the highest binding appeared in hypothalamus, a region with the highest density of SERT. The specific binding ((T/CB)-1) of 125I-ADAM in hypothalamus were 3.38, 3.62 and 4.36 at 60 min, 120 min and 240 min postinjection, respectively. These data suggest that 125I-ADAM may be useful for SPECT imaging of SERT binding sites in the brain.  
        关键词：Serotonin transporter;[125I] ADAM;Synthesis;Biodistribution   
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        发布时间：2021-03-12
      • ZHANG Zhengwei1 HUA Fengchun1 GUAN Yihui1 XIE Mingxuan2 CUI Bing2 KONG Lingshan2 JIANG Xufeng3 LI Biao3 XUE Fangping1 ZUO Chuantao1 ZHAO Jun1 WANG Hongbing1 1
        Issue 10, (2005)
        摘要：To systematically evaluate the efficacy and safety of radiopharmaceutical 18F-FDG provided by Shanghai Kexing Pharmaceutical Corporation, a multicenter study of FDG-PET imaging was conducted at 3 hospitals in 2003. The sterile aqueous solution of 18F-FDG was injected to patients before five items of determination including specific activity, pH, radiochemical purity, bacterial endotoxins were completed. The quality control of 18F-FDG aqueous solution is found to be efficient and so the agent is safe. Average radiochemical purity is 95.7% and is still no less than 90% after 9 hours. Moreover, FDG-PET imaging is very clear and none of 65 patients showed any bad reaction. Diagnostic conclusions accorded with the last clinical diagnosis for most patients (89.23%), though there are still a few false positive cases (4.61%) and false negative cases (6.15%). It is feasible that 18F-FDG produced by PET Center equipped with cyclotron and hot cell could be used in the nearby hospitals.  
        关键词：18F-FDG;Positron emission tomography;Deoxyglucose;Cancer   
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        发布时间：2021-03-12
      • CHENG Xu1 HUANG Gang2 LI Dianfu3 TAO Ruqi4 FENG Jianlin1 LI Jianhua1 LIU Jianjun2 LIU Jianping4 1
        Issue 10, (2005)
        摘要：To investigate the diagnostic value of 99Tcm-MIBI ECG-gated myocardial perfusion imaging (G-MPI) in left bundle branch block (LBBB), twenty-one patients with LBBB underwent stress/rest G-MPI, ETT and echocardiography. Accuracy of all non-invasive methods was assessed. The specificity and accuracy of G-MPI were significantly higher than NG-MPI (P=0.020). The sensitivity and accuracy of G-MPI were significantly higher than ETT (P=0.030 and P=0.006, respectively). G-MPI had high accuracy in diagnosing CAD in patients with LBBB.  
        关键词：Left bundle branch block;99Tcm-MIBI;ECG-gated;SPECT;Coronary artery disease   
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        发布时间：2021-03-12
      • TAN Hongbin1,2 LI Yuxiang1 1
        Issue 10, (2005)
        摘要：Simulation of radioactive waste of U(VI) by uranyl nitrate and the effects of different additive quantities (12%, 20%, 30%, 35%, 40%) of silica fume on the products of U(VI) with Portland cement were studied at a hydrothermal condition of 180℃ for a duration of one week. The X-ray powder diffraction examination results showed that the calcium uranate would be transformed into uranophane when the cement contained 30% silica fume.  
        关键词：Uranium(Ⅵ);Portland cement;Silica fume   
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        发布时间：2021-03-12
      • LIU Shixing1,2 ZHANG Yongming1 YIN Zejie1 WU Xiaoyi1 1
        Issue 10, (2005)
        摘要：A particle track system was constructed in BEPC to trace the particle’s flight path. The multi-wire proportional chambers (MWPC) were used as detectors of particle flight path. The signal of MWPC was amplified by charge sensitive amplifier, converted to digital by charge integrating ADC. This article discusses the principle and linearity of charge sensitive amplifier. The result of simulation and the property of both charge integrating ADC and data acquisition system were described.  
        关键词：Charge sensitive amplifier;Charge integrating ADC;Linearity;Simulation   
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        发布时间：2021-03-12
      • XIAO Wuyun WEI Yixiang AI Xianyun AO Qi
        Issue 10, (2005)
        摘要：Multi-channel pulse height analysis techniques are developing in the direction of digitalization. Based on digital signal processing techniques, digital multi-channel analyzers are characterized by powerful pulse processing ability, high throughput, improved stability and flexibility. This paper analyzes key techniques of digital nuclear pulse processing. With MATLAB software,main algorithms are simulated, such as trapezoidal shaping, digital baseline estimation, digital pole-zero / zero-pole compensation, poles and zeros identification. The preliminary general scheme of digital MCA is discussed, as well as some other important techniques about its engineering design. All these lay the foundation of developing homemade digital nuclear spectrometers.  
        关键词：Multi-channel analyzer (MCA);Digital signal processing;Trapezoidal shaping;Baseline estimation;Pole/zero cancellation   
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        发布时间：2021-03-12
      • XU Huichao ZHANG Jinzhou SHEN Haoyuan ZHANG Guangming
        Issue 10, (2005)
        摘要：Cadmium zinc telluride (CZT) is one of the preferred material for the fabrication of X-ray and gamma-ray detector. Thanks to the relatively high atomic number, high density and wide band-gap, CZT detector possesses sharp energy resolution and high detection efficiency without cryogenic cooling. A prototype planar CZT detector with sensitive volume of Φ 8mm×1.7 mm has been fabricated and the gamma-ray spectra of 241Am were obtained. At room temperature (22℃) and for the 59.54 keV peak, the FWHM can achieve 2.06 keV, while no polarization is observed and stability is very satisfactory.  
        关键词：CZT (CdZnTe);Room temperature detector;Technological process;Performance   
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        发布时间：2021-03-12
      • WANG Hua LUO Jiarong Li Zhiyong HUANG Qinchao Li Guiming
        Issue 10, (2005)
        摘要：In the experiments of HT-7 superconducting tokamak, the instability of the magneto-hydrodynamics (MHD ) is an important factor influencing HT-7 long pulse discharge. Usually, we can suppress MHD through the method of modulating lower hybrid current drive (LHCD). However, experiments found that the LHCD modulation of the whole journey will reduce the drive efficiency of the lower hybrid wave (LHW). Adopting the method of initiative feedback modulating LHCD, we have designed and realized an MHD real-time measuring and processing system. Experimental result has indicated that the system can not only suppress MHD real-timely, but also is unlikely to reduce the drive efficiency of LHW.  
        关键词：MHD;Tokamak;Real-time measuring;FFT   
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        发布时间：2021-03-12
      • LI Chen1,2 ZHAN Wenlong1 XIAO Guoqing1 GUO Zhongyan1 SUN Zhiyu1 LI Jiaxing1 WANG Meng1 MAO Ruishi1,2 CHEN Lixin1,2 HU Zhengguo1,2 1
        Issue 10, (2005)
        摘要：The construction of a large area scintillator fiber ion detector array was described. Time resolution of the detector is experimentally determined by two different methods. The best time resolution of the fiber we have got is 520 ps (FWHM). The angle resolution of the scintillator fiber detector array is 0.39° (?φ), 0.79° (?θ). The transmission efficiency of photo-transmitter was also determined by experiment.  
        关键词：Time resolution;Scintillator fiber;RIBLL;Light guide   
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        发布时间：2021-03-12
      • XIONG Zhengye ZHANG Chunxiang TANG Qiang
        Issue 10, (2005)
        摘要：Polycrystal Li2B4O7 doped with Cu and In was prepared and then sintered at different temperatures. X ray diffraction (XRD), thermoluminescence (TL) and optical stimulated luminescence (OSL) were applied to investigate the bleach of the samples. It was found that the sintering temperature strongly affects the bleach of TL traps in the samples, and the 750℃ is the optimum sintering temperature, which results in the minimum bleach. An explanation was given for the sintering temperature effects on bleach.  
        关键词：Thermoluminescence;Optical stimulated luminescence;Bleach   
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        发布时间：2021-03-12
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