最新刊期
      卷 0 ， 期 0 ， 2020
      • ZHU Jie CUI Mingqi ZHAO Yidong ZHENG Lei
        Issue 4, (2004)
        摘要：Theory etical analysis of bending magnet, wiggler and undulator was introduced, and physical mechanism of polarized light generation was also described. We calculated the polarization state of insert device (3W1 wiggler) of Beijing Synchrotron Radiation Facility (BSRF), which was installed in the ring of Beijing Electron Positron Collider (BEPC). The calculated results were given, which is very important for applying polarized light of 3W1B beamline at BSRF in the future.  
        关键词：Synchrotron radiation;Insertion devices;Polarization   
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        发布时间：2021-03-12
      • LUO Jinlong YING Xuantong CHEN Liangyao
        Issue 4, (2004)
        摘要：The multiple beam interference of the laser reflectance is a conventional method used to monitor the growth of thin films. In this paper we present the application of this method for the fabrication of diamond X-ray windows. The growth process and optical properties were studied in real time by in-situ reflectivity measurement and curve fitting. The research results are in good agreement with the measurement results of the SEM, XRD and α-step surface outline. Using the research results, we fabricate a type of Φ4-8 mm backing-free X-ray windows with high transmission successfully. The transmission was measured at Beijing Synchrotron Radiation Facility (BSRF)of the Chinese Academy of Sciences. The samples remained undamaged after the transmission measurement, therefore, the windows showed the distinct advantages of low absorption and strong radiation resistance.  
        关键词：CVD diamond;In-situ;Reflectivity;Soft X-ray;Transmission   
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        发布时间：2021-03-12
      • SHANG Lei LIU Gongfa CHEN Liping LU Yeming HONG Jun ZHANG Yi ZHAO Feng
        Issue 4, (2004)
        摘要：Upgrade project of the 50 MW klystron modulators of Hefei Light Source (HLS) was firstly introduced. PLC control system of modulators was employed to replace the old control and monitor system, which was based on relay logic circuit and manual operation method. The PLC system becomes a sub system of the new EPICS control system of HLS. Constant-current, switch-mode and high voltage power supplies were adopted to replace the old 50 Hz power supplies. The technology of modulators was improved and operation was more reliable. The design method, hardware and software of PLC control of modulators were described and the performance was presented.  
        关键词：Modulator;PLC control;EPICS;Protection   
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        发布时间：2021-03-12
      • HUANG Hongbo1 ZHENG Wenjun2 WU Liyan2 DAI Yaodong1 HE Yun1 LIN Jun1 XIAYuanfu1 1
        Issue 4, (2004)
        摘要：The electronic configuration of antimony in Ba(Sb0.5In0.5)O3 prepared by hydrothermal synthesis method has been studied by XRD and M?ssbauer spectroscopy. Based on the evaluation of M?ssbauer spectroscopy and considering also the XRD result, the single-phase perovskite crystals are obtained, the covalent bonding of Sb(V) to the neighbouring oxygen reflects on some hybridized orbital behaviour.  
        关键词：Perovskite compound;M?ssbauer spectroscopy;Hydrothermal synthesis   
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        发布时间：2021-03-12
      • JIANG Haifeng ZHU Xikai HUANG Jianming YE Bainian HUANG Manli
        Issue 4, (2004)
        摘要：A test system for measuring the transverse beam of a high power electron gun is introduced. This system adopts Matlab to realize the output of 3-D figure and AT89C55, which controls a step motor to drive wires scanning rapidly across the electron beam and collect data at the same time. With the system one can judge the operation conditions of the electron gun. By means of this system, 5 mA beam was measured, and the beam diameter (13—14 mm) and the profile current matrix were obtained.  
        关键词：Microcontroller;Step motor;Electron gun;MATLAB   
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        发布时间：2021-03-12
      • YU Long1 YU Zengliang2 1
        Issue 4, (2004)
        摘要：The biological effect of 2-keto-L-gulonic acid strains and their DNA implanted by low energy ions have been studied. Through low energy ion beam-mediated transferring foreign DNA into 2-KLG strain, two gene recombination strains were obtained. From this, a new research system—delivery of foreign DNA into microorganism via ion beam— was established, offering a new way to construct genetically engineered microorganism.  
        关键词：Ion implantation;2-KLG;Transformation   
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        发布时间：2021-03-12
      • LIU Xiaoyang1 BAI Xinde2 WAN Qian1 CHEN Baoshan3 WU Zhiming3 1
        Issue 4, (2004)
        摘要：In order to investigate the ion irradiation effect on the corrosion resistance of zircaloy 4, specimens were irradiated by Ar+ ions using an accelerator of 150 keV at a dose range from 3×1013 to 1×1017 /cm2 and at liquid nitrogen temperature. Post-irradiation corrosion tests were conducted by potentiodynamic polarization measurement in a 0.5 mol/L H2SO4 water solution at room temperature. Transmission electron microscopy (TEM) was employed to examine the change of microstructures in the irradiated surface. The potentiodynamic tests showed that with the irradiation dose increasing, the surface passive current density underwent three stages: increased, decreased and increased once again. The mechanism of the corrosion resistance transformation was attributed to defect accumulation, amorphous phase formation and recrystallinization in the irradiated surface.  
        关键词：Zircaloy 4;Ar~+ ion irradiation;Irradiation damage;Corrosion resistance   
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        发布时间：2021-03-12
      • GE Liangquan LAI Wanchang LING Ling LIN Yanchang
        Issue 4, (2004)
        摘要：This paper describes the influence of water content in natural sediments on in-situ EDXRF measurement. Based on the coherent and incoherent scattered X-ray intensities of the primary X-ray emitted from the excited source on sediments, a new correction method has been proposed, which can effectively overcome the influence of water content on the characteristic X-rays of target elements. Tests on powder soil samples from a copper mineral prospecting area show that the intensity changes of the characteristic X-rays from iron (10.9%), copper (300mg/kg) and zinc (124mg/kg) are less than 5% when the changes of water content in the sample are about 20%.  
        关键词：Seabed sediment;X-ray fluorescence analysis;Water content;Scattering correction   
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        发布时间：2021-03-12
      • Erkin GUO Qi REN Diyuan YU Xuefeng LU Wu YAN Rongliang
        Issue 4, (2004)
        摘要：The radiation characteristics and spectral response of home-made thin back field and textured thin back field silicon solar cells irradiated by 1-MeV electrons have been studied. The results indicate that thin back field and textured thin back field silicon solar cells not only have more radiation resistance but also show better electrical characteristics compared with regular back field silicon solar cells.  
        关键词：Solar cell;Electron irradiation;Radiation damage;Spectral response   
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        发布时间：2021-03-12
      • CHENG Guowang HUANG Qunce YU Zengliang
        Issue 4, (2004)
        摘要：The biological effects of nitrogen ion implantation (25 keV; 3.2×1016; 3.9×1016 and 4.6×1016 ions/cm2) on rape M1 generation were studied. The results showed that the germination percent of seeds treated at N+ doses between 3.2×1016 and 4.6×1016 ions/cm2 was not significantly different from control. It was observed that the emergent seedling and survival seedling percent of treated seeds at the dose of 3.9×1016 ions/cm2 was increased. Some agronomic and yield characters, such as plant height, number of leaves, fresh weight per plant at seedling stage, number of leaves, perimeter of stem, length and width of the biggest leaf at flower stage, number of primary branches, number of silique per plant and seed yield per plant at mature stage, were improved and increased at N+ treatment zone. According to the statistical result, the mutation frequency was about 3.2% in the field.  
        关键词：Rape;Nitrogen ion implantation;Biological effects   
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        发布时间：2021-03-12
      • MAO Peihong1,3 LI Xiaoguo2 ZENG Xianxian1,3 JIN Xiang1,3 WANG Guizhong2 1
        Issue 4, (2004)
        摘要：The seed of processing tomato “87-5” (Lycopersicon esculentum Mill) were implanted by the low energy nitrogen ion (N+) with 6 different doses. The rate of emergence was little reduced in M1 generation, but the fruiting number per plant was increased and its maturing earlier 20 days than the control. The precocity, disease resistance and stronger growth vigor were shown in M2 generation. Experimental results of two years showed that, according to synthetic analysis in factors such as precocity, disease resistance, high yield and quality, the N+ dose of 6×1016cm-2 (60 times of pulse) for tomato seed “87-5” had been proved to have notable biological effects on M1 and M2 generation. The seed of eggplant “Wuyeqie” (Solanum melongena L.) was also implanted by the low energy nitrogen ion (N+) with 2 different doses. Multi-vertical channel fruits were obtained in variable M1 generation, which liked the pomelo without peel. The seed of these variable eggplants was taken and planted in the next year. The meaningful variable fruits, the characters of disease-resistance, purple-peel, small-navel, lantern-form, large-scale, etc. were obtained in beneficial M2 generation. The biggest single-fruit weight reached 1.53kg, providing valuable germplasm resource for breeding.  
        关键词：Ion implantation;Processing tomato seed;Eggplant seed;Biological effect   
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        发布时间：2021-03-12
      • ZHANG Yingnan1 GU Weiwang2 LI Tiyuan1 ZHENG Xiangpeng1 GUO Yiling1 LIN Jihong2 HUANG Ruifang1 1
        Issue 4, (2004)
        摘要：To investigate the radiotoxicity to bone marrow in mice after Sr therapy sensitized by nicotinamide and 89 carbogen in mice, the mice were divided into 5 groups: negative control (saline), positive control (89Sr), 89Sr+nicotinamide, 89Sr+Carbogen and 89Sr+nicotinamide+carbogen. 89SrCl was intravenously injected as a bolus containing activities of 7400kBq / 200μL and saline was administrated in equal volume in the negative control group. 1, 2, 3, 4, 6, 8, 15, 20, 30, 60 and 90 days after injection the mice were killed for micronuclei assay in femoral marrow polychromatic erythrocytes (PCE). The average frequency of polychromatic erythrocytes micronuclei (MnPCEs) showed a dual peak. The first maximum MnPCEs frequency occurred between the 2nd and the 4th day, and the second between the 10th and the 14th day. A significant statistic difference on the MnPCEs frequency was found between the negative and the positive control group (P<0.01, F=15.517), while no difference among 89Sr+N+C, Sr, Sr+N and 89 89 89Sr+C was found (P>0.05). There is also no significant difference on MnPCEs frequency between Chinese Kunming Mice, NIH mice, BALB/c and F1 mice (P>0.05). Although the intervention of radio sensitizer accelerated the occurrence of micronulei in PCE, there was no significant statistical difference between the groups with or without radio-sensitizer. The administration of radio-sensitizer did not aggravate the toxicity on marrow.  
        关键词：Bone metastasis;Radiotoxicity;Mouse;89Sr;Nicotinamide;Carbogen   
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        发布时间：2021-03-12
      • WAN Danjing ZHONG Gaoren XU Peikang ZHU Jianhua
        Issue 4, (2004)
        摘要：The purpose of this article is to study the preparation and biodistribution of Tcm-DTPA-folate in nude 99 mice with a human tumor cell implant. DTPA-folate was synthesized by conjugating folic acid to diethylenetriaminepentaacetic(DTPA), then radiolabeled with 99Tcm. The radio-chemical purity and stability were evaluated. The biodistribution of Tcm-DTPA-folate in nude mice with a human tumor cell implant was studied. The 99 result showed that the radiolabelling yield of Tcm-DTPA-folate was as high as 98%. After 4 h at room temperature, 99 the radiochemical purity of Tcm-DTPA-folate was still over 90%. Tcm-DTPA-folate conjugation showed marked 99 99 tumor-specific deposition in vivo. The tumor-to-muscle ratio at 8 h post intraperitoneal injection was 7.5. 99Tcm-DTPA-folate appears to be a potential radiopharmaceutical for targeting tumor-associated folate receptor.  
        关键词：Folate receptor;99Tcm-DTPA-Folate;Biodistribution   
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        发布时间：2021-03-12
      • SUN Qixiang HU Yaer GUAN Hong XIA Zongqin
        Issue 4, (2004)
        摘要：A dementia model was produced in adult Sprague-Dawley rats by bilateral injection of ibotenic acid, 2μg in 0.5μL per side, into basal ganlion. ZDY101, 3.6, 18, 90 mg·kg? ·d? , was given through gastric tube to 3 groups 1 1 of the model rats for 90 days. The learning and memory ability of model rats without treatment declined compared with sham-operated controls, the composite index (number of wrong reponse in 5 min divided by latent period) being 0.71±0.30 vs 0.10±0.13 respectively. The brain M receptor density also decreased as compared with sham-operated controls, being 891±150 vs 1039±214 fmol·mg? protein respectively. ZDY101 simultaneously up-regulated the 1 brain M receptor density and improved the memory and learning ability of model rats. For the middle dose group, the M receptor density was 1028±145 fmol·mg? protein (P<0.05) and the composite index of step-through test was 1 0.20±0.18 (P<0.01). Since there was a significant correlation between M-receptor density and result of step-through test, it is apparent that the mechanism of action of ZDY101 is quite different from that of cholinesterase inhibitor. It is highly probable that the improvement of memory was due to the up-regulation of brain M receptor density  
        关键词：ZDY101;Brain M receptor;Senile dementia   
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        发布时间：2021-03-12
      • WANG Jinhua1 BAO Borong1 WU Minghong1 SUN Xilian1 ZHANG Xianye2 HU Jingxin2 YE Guoan2 1
        Issue 4, (2004)
        摘要：This paper reports the qualitative and quantitative analysis of light hydrocarbons produced by radiation degradation of N, N-dimethyl hydroxylamine. These analyses were performed on the gas chromatograph, in which porous layer open tubular column coated with aluminum oxide and flame-ionization detector are used. For the doses between 10 and 1000kGy, the light hydrocarbons produced by radiation degradation of N, N-dimethyl hydroxylamine are methane, ethane, ethene, propane, propene and n-butane. When the concentration of N, N-dimethyl hydroxylamine is 0.2mol/L, the volume fraction of methane is (9.996— 247.5)×10-6, the volume fraction of ethane, propane and n-butane is lower and that of ethene and propene is much lower. With the increase of dose the volume fraction of methane is increased but the volume fraction of ethane, ethene, propane, propene and n-butane is not obviously changed.  
          
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        发布时间：2021-03-12
      • ZHU Jun ZHU Ruisen
        Issue 4, (2004)
        摘要：To establish the theoretical and practical base for implementing radioactive stents after PTCA in order to prevent restenosis, in virto observation was taken over the effects of 125I-seeds and 103Pd-implanted stents on the vascular smooth muscle cell (VSMC) proliferation. In virto VSMC model from guinea-pig aortic arteries was established using adherent cell culture methods. The effects of 125 I-seeds and 103 Pd-implanted stents on the VSMC proliferation, with or without fetal bovine serum (FCS), were investigated through cell counting methods and H-TDR 3 implementation tests. It was shown that (1) 10% FCS significantly promoted the DNA syntheses of VSMC (P<0.05). (2) Both 125I-seeds and 103Pd-implanted stents inhibited the VSMC DNA syntheses in dose-dependent manner, regardless of 10% FCS inducement. At lower radioactive doses, neither 125I-seeds (18.5—74 kBq) nor 103Pd-implanted stents (1.48—2.96 MBq) exhibited distinctive effects on the VSMC DNA syntheses (P>0.05); and (3) 48 hour exposure from 125I-seeds at 128 kBq or 103 Pd-implanted stents at 7.4MBq did not result in VSMC morphological alteration, but 125I-seeds at 370 kBq caused cells’ morphological changes. Therefore both 125I-seeds and 103 Pd-implanted stents inhibit the in vitro VSMC DNA syntheses, and the inhibition effects are significantly related to their exposure duration and doses.  
        关键词：125I-seeds;103Pd-implanted stents;Vascular smooth muscle cell (VSMC)   
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        发布时间：2021-03-12
      • ZHANG Huabei LI Bo DAI Mei YE Haihong LIU Chunping
        Issue 4, (2004)
        摘要：mTc (CO)3-EC] was prepared and its biodistribution in mice was studied. Biodistribution study revealed that it had pretty high initial kidney uptake and fast renal clearance. It would be helpful for further study of carbonyl technetium core used in the field of kidney imaging agents.  
        关键词：Kidney dynamics imaging agent;Carbonyl technetium core;Biodistribution;Renal tubular excretion   
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        发布时间：2021-03-12
      • HU Mengchun1 YE Wenying2 ZHOU Dianzhong1 WANG Zhentong 1 ZHANG Jianhua1 HU Qingyuan1 PENG Taiping1 YANG Hongqiong1 LI Zhongbao1 1
        Issue 4, (2004)
        摘要：The current output for the detector, which is composed of PMT CHφT3 and ST401 plastic scintillator and exposured to a light source with a pulse width of 2400ns, was measured. Also present was the current output for the CHφT3-CeF3 crystal detector which is relatively insensitive to neutrons. The results show that CHφT3 is a kind of large current photomultiplier tube, its linear output current may be larger than 1.5A with a microsencond pulse mode, its saturated output current is larger than 3.5A, and dark current smaller than 10nA. It is one of the choices to reduce the uncertainty of joining the ranges of detectors in the measurement of pulse with large dynamic range.  
        关键词：Scintillator;Photomultiplier;Gamma rays detection;Sensitivity;Pulse signa   
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        发布时间：2021-03-12
      • WU Jun1 ZHANG Benai1 SHEN Yaosong1 HU Side2 1
        Issue 4, (2004)
        摘要：In this paper, the time character of delayed neutrons is considered. The method of computing transportation of delayed neutrons is studied. Technology and method of detecting nuclear warheads by counting delayed neutrons are discussed. The results show that a nuclear warhead could be detected by counting delayed neutrons. But, this method could not discriminate the real warhead from the fake one that contains only natural uranium if the design information of the warhead is unknown beforehand. So the joint use of this method with others will be necessary.  
        关键词：Delayed neutron;Active detection;Nuclear warhead   
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        发布时间：2021-03-12
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