最新刊期
      卷 0 ， 期 0 ， 2020
      • WANG Naxiu ZHANG Yinji
        Issue 6, (2002)
        摘要：The FEA result of the first crystal of double crystal monochromator (DCM) at SSRF, which is exposed to Wiggler source and cooled by liquid nitrogen was reported. The slope error of the surface exposed to high thermal load is 2.33μrad. We also try to calculate the full width at half maximum (FWHM)of the crystal rocking curve by SHADOW software. The result indicates that design of cooling system and method are quite enough to meet with the requirement of DCM. And it is an efficient way of predicting optical parameter of DCM by calculating the FWHM of rocking curve of crystal with thermal distortion by SHADOW.  
        关键词：Synchrotron radiation;Rocking curve;Liquid nitrogen cooling;Finite element analysis;Optics trace   
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        发布时间：2021-03-12
      • ZHOU Xinwen 1 ZHU Guonian 2 SUN Jinhe 3 Jilisa Mwalilino 2 1
        Issue 6, (2002)
        摘要：The breaks and repair of the carassius auratus’s cellur DNA induced by the metal mixture were studied by using the agrose gel elecrophrosis technique and 3H-TdR incorporation experiment. The results demonstrated that DNA breaks were detected after treated by zine, lead and metal mixture, and the RNSB order was the metal mixture>Pb>Zn. The DNA repair was found among the zinc treatment, cadmium treatment, lead treatment as well as metal mixture treatment, and the order of the repair ability was the metal mixture>Pb>Zn>Cd. The mixture of the metals increased the damage to the DNA. The results also showed that the result of the DNA breaks was not conformed completely to that of the DNA repair.  
        关键词：Mixture-Metals;Carassius auratus;Liver cellur DNA;Breaks;Repair   
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        发布时间：2021-03-12
      • GUO Liping SUN Kai CHEN Dongfeng ZHANG Baisheng CHENG Zhixu ZHAO Zhixiang
        Issue 6, (2002)
        摘要：Vertically focused monochromator technique is an effective tool of increasing neutron intensity at sample position. Monte Carlo simulation is applied in choice of vertically focused monochromator of the high resolution neutron powder diffractometer (HRPD) at China Advanced Research Reactor (CARR). The height,curvature radii and tilting angles of the monochromator are obtained. The intensity gains of the vertically focused monochromator comparing to flat monochromator and the effective neutron beam size at sample position are given by simulation.  
        关键词：Vertically focused monochromator;Intensity gain;Monte Carlo simulation;High resolution neutron powder diffractometer;Neutron diffraction   
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        发布时间：2021-03-12
      • DANG Bingrong WEI Zengquan DUAN Limin ZHANG Baoguo LI Songlin YIN Xu ZHU Yongtai LI Wenjian LI Qiang YUAN Shibin
        Issue 6, (2002)
        摘要：By using a 55MeV/u 40 Ar 17+ beam produced by HIRFL, the distribution of fragments in 1.5mm lucite on three different directions were meaured at the radiobiology terminal. Feasibilities of the phoswich detector composed of fast plastic scintillator and CsI(Tl) detectors for determination of angular distribution of fragments in tissue-equivalent materials were investigated. The results obtained were satisfactory.  
        关键词：Detector of Phoswitch;Fragmentation of heavy ion;Tissue-equivalent material   
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        发布时间：2021-03-12
      • CHEN Ming
        Issue 6, (2002)
        摘要：The principle, structure, adjustment of the gap voltage, beam dynamic, RF system and the bunchers of the post-accelerator with Interdigital-H type structure, which was developed by the author and Technical University Munich in four years, is described. The energy of ions with mass of three was increased from 340keV to 1.74MeV, when resonant frequency of 84.2MHz and input RF power of 3kW. The effective shunt impedance reached to 408MΩ/m. The commissioning was succeeded with H + 3 ion beams. The output energy of H + 3 ion beams reached the design value. The two harmonic double drift buncher used by the IH structure bunches the beam to the bunches with the width of 360ps. Then the acceptance of the IH structure is increased to 240°. Its shunt impedance is three times higher than former single gap bunchers used by TUM and the length of the buncher system is one fifth of former one only because the use of λ/4 coaxial cavities with double gaps.  
        关键词：Accelerating structure of Interdigital-H type;Two harmonic double drift buncher;Coaxial cavity with double gaps   
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        发布时间：2021-03-12
      • AN Jigang ZHOU Liye LIU Yisi WU Haifeng WU Zhifang XIANG Xincheng WANG Liqiang ZHANG Yanmin LIU Ximing TAN Chunming
        Issue 6, (2002)
        摘要：This paper presents a container inspection method and apparatus using cobalt-60 γ digital radiography technology, which was proposed and realized by the Institute of Nuclear Energy Technology (INET) of Tsinghua University. In this kind of inspection system, the radiation source is a conventional radiography 60Co projector of 3-11TBq. This projector is reliable, save and cheap, but its radiation output is several hundred times weaker than accelerator’s. With the special sensitive array detector invented by INET and the advanced signal and image processing technology, the characteristics of this inspection system are equivalent to those of expansive accelerator type inspection system, but much cheaper, safer, more reliable and easier to operate and maintain. This paper illustrates the main project idea, construction, principle and characteristics of 60Co container inspection system. The situation of its production, serialization and application are mentioned too.  
        关键词：Cobalt-60;Container inspection;Digital radiography   
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        发布时间：2021-03-12
      • GAO Wenhuan LIN Yuzheng KANG Kejun
        Issue 6, (2002)
        摘要：Concerning the container inspection systems with an accelerator as its radiation source, this paper introduces the technical development and the new systematic targets of THSCAN Mobile System and THSCAN Relocatable System in the fields of accelerator, detectors, image processing and radioprotection.  
        关键词：Container inspection system;Accelerator;Radiation source   
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        发布时间：2021-03-12
      • ZHAO Zhenjie RUAN Jianzhong JIANG Keyu ZENG Lang YANG Xielong
        Issue 6, (2002)
        摘要：Amorphous Fe 73.5Cu 1Nb 3Si 13.5B 9 alloy was annealed under stress by DC Joule-heating to induce magnetic anisotropy. The magnetic properties of the treated samples were examined by dynamic hystersis loops, longitudinally driven giant magneto-impedance effect and Mssbauer spectra. The experimental results show that nanocrystallization occurs in the amorphous alloys when the current density is above 4.11×10 7A/m 2, and the annealed samples will be induced transverse magnetic anisotropy under suitable current and stress. The magnetic anisotropy increases with the increasing of annealing current density, which is closely related to the amount of α-FeSi nanocrstalline in the alloy.  
        关键词：Mssbauer spectra;Nanocrystalline alloy;Giant Magneto-impedance;Transversal magnetic anisotropy   
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        发布时间：2021-03-12
      • JI Xinming ZHU Jieqing XU Hongjie
        Issue 6, (2002)
        摘要：Lead contents in some PVC ware samples were measured by XRF. The high lead levels above 1% in all samples remind us that it is necessary to develop new stabilizers to replace the harmful organo-lead in the plastic ware production.  
          
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        发布时间：2021-03-12
      • YUAN Wanming 1 WANG Shicheng 1 YANG Zhiqiang 2 WANG Lanfen 1 1
        Issue 6, (2002)
        摘要：Fission track ages (FTA) of 4 apatite samples collected from Langkazi to Yarlung Zangbo thrust zone range between 13.6 and 17.2 Ma, reflecting the time of continent-continent collision and differing from previous data. The negative correlation between the FTA and sample elevations shows there was rapid uplifting during the continent-continent collision with uplifting rate of 176m/Ma. Denudation degree, denudation rate and cooling rate were ~2.9km, 213m/Ma and 7℃/Ma respectively since 13.6Ma. FTA of 3 zircon samples are different significantly and have χ 2 test value of <0.1%, confirming the orogeny within continent went under low temperature.  
        关键词：Fission track;Dating;Tectonization;Apatite;Zircon;Uplifting and cooling;Northern Himalaya block   
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        发布时间：2021-03-12
      • BAO Borong 1 SHAO Hua 2 HAN Jingtian 2 YANG Yonghui 3 SUN Sixiu 3 1
        Issue 6, (2002)
        摘要：The extraction thermodynamics of uranium(Ⅵ) from nitric acid solution by N-octanoylpiperidine in toluene was investigated. The results showed that two extracted species of UO 2(NO 3) 2(OP) and UO 2(NO 3) 2(OP) 2 were formed, and the equilibrium constants were K ex1=0.538 and K ex2=4.230 respectively. Through considering the sub-reaction of extraction, the equilibrium constant of extracting nitric acid with N-octanoylpiperidine were obtained to be K HNO 3=0.097.  
        关键词：N-Octanoylpiperidine;Uranium (Ⅵ);Extraction;Thermodynamics   
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        发布时间：2021-03-12
      • ZHAO Weijuan 1 XIE Jianzhong 1 LI Guoxia 1 GAO Zhengyao 1 LI Rongwu 2 ZHANG Bin 3 FENG Songlin 4 HUANG Zhongxiang 4 JIA Xiuqin 4 HAN Song 4 1
        Issue 6, (2002)
        摘要：The 46 samples of glazes and bodies of the ancient Chinese Ru porcelain, Jun Porcelain and imitative porcelain were analyzed by neutron activation analysis (NAA). The contents of 36 elements for each sample were measured, the eight elements were chosen as the fingerprint elements to complete scatter analysis. The result showed that the ancient Chinese Ru porcelain and Jun porcelain had almost identical and stable sources of raw materials. The close provenance relation between ancient Chinese Ru porcelain and Jun porcelain was preliminarily verified. It is found that most modern Jun porcelain samples were similar to the ancient Chinese Jun porcelain, three modern Ru porcelain samples were similar to the ancient Chinese Ru porcelain. Jingdezhen porcelain has no relation to Ru porcelain and Jun porcelain.  
        关键词：Neutron activation analysis;Fingerprint element;Scatter analysis;Provenance relation   
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        发布时间：2021-03-12
      • WANG Chao LU Ting WANG Xinfu ZHOU Hongyu ZHU Guanghua
        Issue 6, (2002)
        摘要：An implanter with a metal vapor vacuum arc ion source (MEVVA) was employed to implant Au + ions into peanut embryo. The methods of Rutherford Backscattering Spectroscopy and X-ray Energy Dispersive Analysis were adopted to measure depth distribution of Au in peanut embryo. The results show that the method of RBS is not capable for measuring the depth distribution because of uneven sample surface; on the contrary, the method of EDAX gives a penetration depth of 15μm. By comparing to the unimplanted sample, obvious changes in morphologies were observed in implanted peanut embryo. The mechanism of mutagenic effects induced by ion implantation was briefly discussed.  
        关键词：Ion implantation;Depth distribution;Peanut embryo;Morphology   
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        发布时间：2021-03-12
      • CHEN Zhenping 1 ZHANG Jincang 2 LI Xigui 3 1
        Issue 6, (2002)
        摘要：The effects of sintering time on the orthorhombic structure and positron lifetime parameter in YBa 2Cu 3O 7-δ have been studied by XRD?SEM and the positron experiments. It is found that on the condition of 950℃/12-72h, the positron experiment has good stability and reliability. This experiment indicates that the longer sintering time is needed to prepare Y-123 samples.  
        关键词：YBa 2Cu 3O 7-δ superconductor;Positron lifetime parameter;Crystal structure;Defect concentration   
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        发布时间：2021-03-12
      • LI Junling ZHANG Lan ZHANG Xiuli WANG Yongxian
        Issue 6, (2002)
        摘要：The nuclear properties and commonly labeling methods of fluorine-18 are described. The synthesis, application and potential promise of many fluorine-18 labeling of amino acids are discussed in detail.  
        关键词：F;PET;Amino acids   
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        发布时间：2021-03-12
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