最新刊期
      卷 0 ， 期 0 ， 2020
      • CHENG Weixing CHEN Yongzhong ZHOU Weimin YE Kairong LIU Dekang
        Issue 12, (2002)
        摘要：EPICS is the most popular developing platform to build control system and beam diagnostic system in modern physics experiment facilities. An EPICS based data acquisition system was built in Redhat 6.2 operation system. The system is successfully used in the beam position monitor mapping, it improves the mapping process a lot.  
        关键词：EPICS;BPM Mapping;DAQ   
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        发布时间：2021-03-12
      • YUAN Shibin WEI Zengquan LI Qiang
        Issue 12, (2002)
        摘要：Researchers have used heavy ion beams to implant small biomolecules, followed by advanced instrumental analysis to make preliminary studies on mass deposition induced by ion implantation. But research reports on the biological effects, i.e. mass deposition effects induced by mass deposition in living tissues, cells and macro-biomolecules haven’ t been delivered hitherto. In the near future radioactive heavy ion beams will be possible to implant living cells and biomoleules, and autoradiography, radioactive measurements and molecular biological techniques will be employed to further studies on the effects.  
        关键词：Heavy ion implantation;Biological effects;Mass deposition effects   
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        发布时间：2021-03-12
      • TONG Yongpeng JIANG Da NI Xinbo LU Rongrong ZHANG Guilin
        Issue 12, (2002)
        摘要：PM 10 was collected by a stacked filter air sampler. The elemental contents were analyzed by proton induced X-ray emission (PIXE). The PM 10 solution was instilled every other day to SD mouse’ s lung for one month. The sterile physiological saline was used as the control. One month later, histopathology of the lung tissue was studied and the elemental distributions were analyzed by Scanning Proton Microprobe (SPM). The particle instilled mouse’ s lungs showed measurable inflammation, and the contents of metal binding protein (albumin etc.) in BALF were significantly higher than those of controls. The Ca and Zn contents in tissues were significantly lower than those of controls, while Fe content of PM 10 instilled mice were significantly higher than that of controls. The increased Fe content in pneumonic tissue was duo to the unsoluble Fe compounds (from PM 10 ) remaining in lung tissue which were observed by SPM. The decreased Zn and Ca contents in pneumonic tissue were duo to the progress of pneumonia. The unsoluble Zn and Ca in lung tissue may be extracted by some enzymes and then changed to soluble in the progress of pneumonia. It is suggested that the Zn and Ca efflux from lung tissue may be a way of damaging lung.  
        关键词：PM 10;Scanning proton microprobe;Elemental distributions   
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        发布时间：2021-03-12
      • QIN Guangming ZHANG Yongxue AN Rui
        Issue 12, (2002)
        摘要：Chloronictinic acid reacts with hydrazine hydrate to give 6-hydrazinopiridine-3-carboxylic acid, and the latter then reacts with di-tert-buty dicarbonate to produce 6-BOC-hydrazinopiridin-3-carboxylic acid, which has the hydrazino group protected by BOC. After the NHS is conjugated with 6-BOC-hydrazinopiridin-3-carboxylic acid, the BOC group is eliminated by adding the HCl/dioxane solution to give the final product.  
        关键词：Chelator;NHS-SHNH;Chemical synthesis   
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        发布时间：2021-03-12
      • WU Yuguang ZHANG Tonghe ZHANG Xu LIU Andong
        Issue 12, (2002)
        摘要：Polyethylene terephthalane (PET) has been modified with Si ions from a metal vapor arc source (MEVVA). After implantation, the surface structure has been greatly changed. The experimental results of infrared absorption indicated that the particles are referred to rich carbon and SiC particles. The PET has been strengthened by these dispersed particles. The measurement results using nanometer hardness tester reveal that both surface hardness and modulus increase obviously. Therefore the surface wear resistance improved extremely. Finally the modification mechanism of Si implanted PET was discussed.  
        关键词：Si ion implantation;Tribological properties;Surface strengthening mechanism;Polymer   
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        发布时间：2021-03-12
      • XIE Zhi 1 SUN Weidong 1 CHAI Zhifang 2 CHEN Jiangfeng 1 DU Andao 3 LI Chunsheng 2 MAO Xueying 2 1
        Issue 12, (2002)
        摘要：Two molybdenite samples from the Middle-Low Reaches of the Yangtze River were dated by both Os-Os and Re-Os methods. Os-Os and Re-Os dating give identical age results for the two samples. An experiment of step distillation of Os-Os method suggests that no isotopic fractionation is observed between fractions obtained by the experiment. The results prove that the Os-Os method can avoid the problems in the Re-Os method, simplify the experimental procedure, give creditable age data, and have unique advantage that no quantitative extracting of Os is required.  
        关键词：Os-Os dating method;Re-Os dating method;Molybdenite   
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        发布时间：2021-03-12
      • ZHANG Lan 1 TANG Ganghua 1,2 ZHOU Wei 1 LI Junling 1 YIN Duanzhi 1 TANG Xiaolan 2 WANG Yongxian 1 HUANG Zuhan 2 1
        Issue 12, (2002)
        摘要：Trimethylammonium veratraldehyde triflate was synthesized and used as a precurser for the synthesis of 6-Fluoro-L-DOPA by using the chiral phase-transfer catalyst, O-Allyl-N-(9)-anthracenylcinchonidinium bromide which was also synthesized in this study. Based on these, 6-Fluoro-L-DOPA was prepared with acceptable radiochemical yield (10±3)% in short synthesis time (80min), with high radiochemical purity, specific activity and chemical purity.  
        关键词：PET;6-Fluoro-L-DOPA;Nucleophilic substitution;Enantioselectivity;Chiral phase-transfer catalysis   
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        发布时间：2021-03-12
      • XIN Renxuan CHEN Jiyang LIANG Junfu SONG Chongli
        Issue 12, (2002)
        摘要：The trialkylphosphine oxide (TRPO) presents excellent extraction abilities for the actinides elements and it has a high radiation stability. The 30% TRPO-kerosene was used as extractant for high level active liquid waste (HAW) treatment. Large percentage of Fe(Ⅲ) is of ten included in HAW. In this paper, the effects of iron on extraction and back-extraction have been studied. A number of experimental solutions containing 30% TRPO-kerosene were prepared. The total absorptive dose of organic phase was in the range of 0.1×10 5-10.0×10 5Gy. The results show that the γ radiation had no effect on the distribution ratio when absorptive dose was in the range of 0.1×10 5-1.0×10 5Gy. However, when total dose reached more than 3.0×10 5Gy, the distribution ratio of Fe(Ⅲ) increased remarkably. The study also suggests, that radioactive effect may be eliminated by back-extraction with 0.6mol/L oxalic acid solution.  
        关键词：irradiation;Trialkylphosphine oxide;Extraction   
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        发布时间：2021-03-12
      • WU Minghong BAO Borong CHEN Jie SHI Xin
        Issue 12, (2002)
        摘要：A review is given for some aspects of research work in thermosensitive hydrogel, including the study on mechanism of phase change, the preparation of thermosensitive hydrogel and its practical application in many fields such as chemistry, biotechnology and medicine. However, mechanical strength of the hydrogel is weak. To improve its mechanical strength, copolymerization and the interpenetrating polymer network have been tried. A new thermosensitve material, with higher mechanical strength and more sensitive to temperature, has been prepared by preirradiation grafting.  
        关键词：Thermosensitive;Hydrogel;Radiation grafting;Phase change;Low critical solution temperature (LCST)   
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        发布时间：2021-03-12
      • ZHOU Wei HU Weiqing ZOU Hao CHEN Minfeng WANG Yongxian
        Issue 12, (2002)
        摘要：Fluoride was adsorbed from 18 O enriched water by QMA-SepPak Cartridge and eluted by K 2CO 3 solution. The experimental results showed that the recovery of the 18 O enriched water was greater than 95% and the recovery of -Fluoride was also greater than 95%. It is proved that the method can satisfy the demands of routine production of 2- 18 FDG.  
        关键词：O enriched water;-Fluoride;QMA-SepPak Cartridge   
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        发布时间：2021-03-12
      • XIAO Detao 1 PAN Ziqiang 2 LING Qiu 1 DONG Liucan 3 J.K.C.Leung 4 1
        Issue 12, (2002)
        摘要：The sensitivity of thoron monitoring method can be improved largely by applying an electrostatic field in the sampling chamber of thoron dosimeter because more than 90% of the thoron progenies are positively charged at the moment when they generate. The paper introduces a sensitive thoron monitoring method by both using electret to produce electrostatic field in the sampling chamber and using CR-39SSNTD to record α particles emitted from thoron and its progenies. Compared to normal Simultaneous and absorber methods, the new method presents 8 and 33 times sensitivity for thoron monitoring, respectively.  
        关键词：Electret;Thoron;Dosimeter;Sensitivity   
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        发布时间：2021-03-12
      • LI Buqing 1,2 CHEN Wenming 1 YAN Lifeng 1 1
        Issue 12, (2002)
        摘要：A functional comonomer, sodium polyglycol dimaleate monoester (PEGMA ) made from polyglycol(PEG), was synthesized by PEG ester reaction with maleic anhydride (MA) catalyzed by p-toluene sulfonic acid. Its structure was dentified with FT-IR. Then the PEGMA macromonomer was mixed with acrylic acid (AA) and neutralized by sodium hydroxide. The mixture solution was irradiated with a 60 Co γ-source and there formed P(AA-b-PEGMA) superabsorbent. Effects of monomer ratio, irradiation dose and total concentration of monomer on absorbency of the superabsorbent were also studied. Its optimum absorbency obtained is 3.786×10 3 for salt-free water and 0.176×10 3 for 0.15 mol/L NaCl solution, respectively. Structure characteristics of the superabsorbent were determined by FT-IR and SEM  
        关键词：Superabsorbent;Block co-polymerization;Irradiation induced polymerization   
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        发布时间：2021-03-12
      • SHAO Hua 1 BAO Borong 1 HAN Jingtian 2 YANG Yonghui 3 SUN Sixiu 3 1
        Issue 12, (2002)
        摘要：The extraction kinetics of uranium(Ⅵ) from nitric acid solution with N-octanoylpiperidine (OP) in toluene was investigated by means of stationary interface stirring cell. The experimental results show that the extraction process may be controlled by the following interface reaction: UO 2(NO 3) ++OP·HNO 3(i) =UO 2(NO 3) 2·OP (i) +H +. The effects of temperature, acidity and extractant concentration on the extraction rate were also discussed.  
        关键词：N-Octanoylpiperidine;Uranium(Ⅵ);Extraction;Kinetics   
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        发布时间：2021-03-12
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