最新刊期
      卷 0 ， 期 0 ， 2020
      • ZHANG Tonghe MA Furong WU Yuguang WANG Xiaoyan LIANG Hong
        Issue 3, (2001)
        摘要：The influence of conditions of C3W3C3-implanted H13 steel on corrosion resistance was studied using multi-sweep cyclic voltammetry. The structure and formation conditions of phases in corrosion resistance and effects on corrosion resistance were researched. A super-saturated solid solution of W and C atoms was formed in C3W3C3-implanted steel; the phases of Fe 2W, WC and FeW 3C were obtained in the implanted surface of steel. A passivation layer was formed. Because the multi-implantation possessed both advantage of W and C single implantation in corrosion resistance, so that the implantation is better than single and dual-implantation. The corrosion resistance of the multi-implantation was enhanced following increase of ion dose. After corrosion for 50 voltage sweeps, the J p of C3W3C3 and C3W3 decreased 60% and 47% comparing to H13 steel respectively. The J p of C3W3C3 decreased 34% comparing to C3W3. It is found from SEM observation that after corrosion the passivation layer still existed.  
        关键词：Tungsten plus carbon multi-implantation;Steel;Corrosion resistance;Electrochemical measurement   
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        发布时间：2021-03-12
      • YUAN Shuanggui YANG Weifan XU Yanbing HE Jianjun MA Taotao LI Zongwei XIONG Bing
        Issue 3, (2001)
        摘要：Th has been produced via a multinucleon transfer reaction by 60MeV/u 18 O ions bombardment of natural uranium. Thorium was radiochemically separated from the irradiated targets, 237 Pa as a daughter nucleus of 237 Th has been identified according to the growth and decay of 237 Pa γ rays observed. The half-life of 237 Th was determined to be 4.69±0.60min.  
        关键词：Half-life;Multinucleon transfer reaction;Radiochemical separation;Growth and decay   
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        发布时间：2021-03-12
      • ZHAO Ziqiang LI Xuenan HAN Zhaohui DU Qingli
        Issue 3, (2001)
        摘要：In the case of 0.6MeV/C carbon clusters C n +( n =1—5) implantation into NaCl crystal, a cluster zone about 321nm calculated by TRIM program was observed. The optical absorption indicated that the defect concentration of NaCl caused by carbon cluster implantatoin varied with the size of cluster. The bigger cluster induced V 2 and V 3 color centers and higher defect concentration.  
        关键词：Cluster zone;Color center absorption   
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        发布时间：2021-03-12
      • HE Ming CHEN Quan QIN Jiuchang JIANG Shan WU Shaoyong GUO Gang XU Jincheng
        Issue 3, (2001)
        摘要：The production of the 64 Cu radioactive nucleus beam and the new particle identification techniques used in the accelerator mass spectrometry for measurement the component of the 64 Cu radioactive nucleus beam have been introduced.  
        关键词：Cu radioactive nucleus beam;Accelerator mass spectrometry;Measurement   
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        发布时间：2021-03-12
      • LI Yongliang 1 ZHANG Tonghe 2 ZHOU Gu 1 WANG Guangfu 1 WANG Xiaoyan 2 1
        Issue 3, (2001)
        摘要：Titanium films were deposited with magnetically filtered vacuum-arc plasma source on H13 steel substrates. The deposited film was studied by TEM. The crystalline beard of microstructure was observed in the deposited layer. The electrochemical measurements indicated that the corrosion current density of the deposited samples decreased by 1—2 orders compared with that of the H13 steels, and hence the corrosion resistance properties of H13 steel were be improved with the Ti deposition. Ion implantation could further improve corrosion resistance properties of deposited samples. The morphology of corroded samples was observed by SEM, and the mechanism of corrosion resistance of deposited samples was also discussed.  
        关键词：Titanium deposited film;Microstructure;Corrosion resistance properties   
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        发布时间：2021-03-12
      • WANG Yinsong 1 ZHAO Huifang 2 ZHANG Tianxi 2 TAN Mingguang 1 ZHUANG Guisun 1 CHEN Baolin 3 TIAN Hengli 2 SUN Qingfang 2 1
        Issue 3, (2001)
        摘要：Cerebral ischemia is a serious cerebral vascular disease. In this work, the cerebral ischemia model of rabbit was established through operation. The elemental contents of Zn, Se, Mg, Mn, Na, K and Cl in rabbit brain tissues were determined by instrumental neutron activation analysis (INAA). The results show that some elemental contents change obviously after cerebral ischemia and change with time. The correlation of some elemental contents between left and right brain tissues was observed, and the correlation between Na and Cl contents in brain was also observed.Traditional chinese medicine is effective to cure cerebral ischemia. Two new Chinese medicines were applied to rabbits with cerebral ischemia, and their influence on elemental contents were observed.  
        关键词：Cerebral ischemia;Elemental contents;INAA;Rabbit brain tissues;Chinese medicine   
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        发布时间：2021-03-12
      • LIU Nianqing LIU Pingsheng
        Issue 3, (2001)
        摘要：The contents of K, Ca, Mn, Fe, Cr, Cu, Zn, Rb and Pb in the erythrocyte of 5 groups of rats, were measured by PIXE and XRF. Four groups of the cretinism rats were continuously fed the feed from epidemic cretinism area. Three groups among them drank the water with I and/or Se supplementation. Control group was normal rats fed normal feed. Five weeks later the blood samples were collected. The erythrocyte was separated for the determination of elemental concentrations, the serum for the radioimmunoassay of thyroid hormones T3, T4, FT3, FT4 and rT3 status. The comparison among five groups and the correlation between elements and thyroid hormones were performed by using SPSS/PC statistical package. The results showed that comparing with non-supplementation or control groups the concentrations of Zn, Mn, Cu, or Rb in the groups of I and/or Se supplementation were significantly fluctuating, while thyroid hormones T4, FT4 and rT3 significantly increased.  
        关键词：PIXE;Cretinism rats;Trace elements;Thyroid hormone   
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        发布时间：2021-03-12
      • ZHU Liming KUANG Hua CUI Liyan SUN Yonghui CAO Zhengbai
        Issue 3, (2001)
        摘要：The extraction of dioxouranium(Ⅵ) from nitric acid solution by PhSO(CH 2) nSOPh ( n =2,3,4,6)-trichloromethane was studied. When the disulfoxide was PhSO(CH 2) 2SOPh, the third phase formed. The extraction laws of dioxouranium(Ⅵ) by the disulfoxides ( n =3,4,6) were similar to that by tributyl-phosphate(TBP). Their extracting ability was slightly better than that of TBP.  
        关键词：Disulfoxides;Tributylphosphate;Dioxouranium;Extracting   
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        发布时间：2021-03-12
      • LI Zhenkun WANG Zhiguo HAO Jifang
        Issue 3, (2001)
        摘要：The feasibility of applying total reflection X-ray fluorescence spectroscopy to the routine analysis was briefly discussed, and results show that the concentrations for trance elements Zn and Pb are 0.1ng/μL and 3.5ng/μL in one Ni-electrolyte analyzed.  
        关键词：Total reflection X-ray fluorenscence spectroscopy;Ni-electrolyte;Quantitative analysis of trace element   
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        发布时间：2021-03-12
      • ZHANG Qiangji ZHANG Haitao KONG Lingzhu LU Ming
        Issue 3, (2001)
        摘要：The analyses of kinematic process of the ”helium blanketing effect (HBE)” were performed. With the simulation of the kinematic process the authors got a better understanding of the mechanism of HBE: HBE is a diffusion limited mass transfer process, the existence of line limitation is the main factor leading to the appearance of HBE. The ”bulk flow”(BF) model proposed by Ortman could predicate the blanketing pressure, however, It did not describe the kinematic process of Hydrogen absorption.  
        关键词：Helium blanketing effect;Kinematic process;Computer simulation   
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        发布时间：2021-03-12
      • ZHENG Wenge NI Xiaojun
        Issue 3, (2001)
        摘要：The free uranium content (the ratio of free uranium which is not entirely coated with SiC layer in coated fuel particles to total uranium in coated fuel particles) and the uranium content were studied and determined by laser-induced fluorimetric method and titration with a potentiometer. The sample was burned in air first, then immersed and refluxed in nitric acid to separate the free uranium with coated fuel particles to the nitric acid solution. The uranium content in sample solution can be directly measured by laser-induced fluorimetric method, other elements had no interference on the determination of uranium. The method is simpler, faster and more accurate than traditional method in uranium analysis. The method has low measurement error of below 10%, and satisfies the needs of the specifications in the manufacture of coated fuel particles.  
        关键词：Laser-induced fluorimetric method;Free uranium content;Coated fuel particles   
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        发布时间：2021-03-12
      • JI Shuren WU Chunying LU Chunxiong
        Issue 3, (2001)
        摘要：A new 125 I radioiodination based on the Cu(Ⅰ) assisted isotopic exchange in an ethanol water mixture ofβ-methyl-ω-p-iodophenyl pentadecanoic acid was studied. It was compared with the solid-phase method and the direct labelling method (trifluoro acetic thallium). The yield of labelling based on the Cu(Ⅰ) is more than 95% confirmed by TLC and molecular imaging system.  
        关键词：Isotope/labelling;125 I -;125 I-BMIPP   
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        发布时间：2021-03-12
      • LIN Jian’an HE Wei
        Issue 3, (2001)
        摘要：According to the experimental result,a method of protecting Tokamak from high power,long pulse microwave was recommended in the article,the menace to LHCD system and Tokamak is exterminated with the protection system when plasma-current extinguishes.  
        关键词：Tokamak;Plasma-current;LHCD system   
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        发布时间：2021-03-12
      • HUANG Yongjian ZENG Ying ZHOU Rongsheng
        Issue 3, (2001)
        摘要：A chemical pretreatment flow chart for the enrichment of platinum and palladium in the copper-nickel sulfide was discussed in this paper, the combined method of solvent extraction and sulfonic-type cation exchange resin was used in the analysis. The whole analytical process of ion-exchange pretreatment NAA was enunciated. The related parameters showed that such method could be applied to the analysis of Pt and Pd in the copper-nickel sulfide.  
        关键词：Ion-exchange pretreatment;NAA;Platinum;Palladium;Copper-nickel sulphide   
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        发布时间：2021-03-12
      • FAN Hongmei WANG Tongqing GUO Bin GUO Yingxiang
        Issue 3, (2001)
        摘要：The design principle, structure and operation performance of the FEBIAD target ion source were described. The off-line overall efficiencies are 3.1% for Krypton and 4.5% for Xenon, the total ion current being less than 10μA. The on-line overall efficiencies are 1.5%—2.0% for 104 In and 1% for 104 Ag and 104 Gd.  
        关键词：On-line isotope separator(ISOL);Target ion source;On-line efficiency   
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        发布时间：2021-03-12
      • HUANG Guirong PEI Yuanji DONG Sai
        Issue 3, (2001)
        摘要：By using the computer image processing technology and RF phase auto-shifting system, the ESS (Energy Stabilization System) was applied to 200MeV Linac. The ESS adjusts beam energy automatically in a range of ±4MeV. After adjustment beam energy stability is improved to ±0.6%.  
        关键词：Linac;Energy stability;Computer image processing   
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        发布时间：2021-03-12
      • SONG Wenjie
        Issue 3, (2001)
        摘要：This paper presented the physics design of the irradiation box for a electron accelerator with maximum energy of 300keV and beam intensity of 60mA. The thickness of the box body is 1.5cm of lead.  
        关键词：Electron accelerator;Irradiation box;Design   
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        发布时间：2021-03-12
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