最新刊期
      期 4 ， 2006
      • GUO Jinxue,LI Wenxin
        Vol. 24, Issue 4, Pages: 193-197(2006)
        摘要：Water-soluble multi-walled carbon nanotubes (MWNTs) were obtained by functionalizing MWNTs with glucosamine after γ-ray irradiation. Products after each chemical treatment were characterized by FTIR and RAMAN spectroscopy. Elemental and TGA analyses of the modified MWNTs indicated that the concentration of functional groups bound on MWNTs increased with irradiation dose, due to increased defects of the MWNTs induced by γ-irradiation. Water solubility of MWNTs modified with glucosamine after irradiation enhanced considerably. The results provide a novel access for functionalizations and applications of carbon nanotubes.  
        关键词：MWNTs;γ-ray irradiation;Water solubility;Chemical modification   
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        发布时间：2023-03-30
      • HE Yong,SUN Mengzhou,OU Xiaowei,WU Feipeng,NIE Jun
        Vol. 24, Issue 4, Pages: 197-200(2006)
        摘要：Cationic UV curing of bis-phenol A epoxy resin was studied. Effects of the component combinations on photocuring kinetics were investigated with the lowest photocuring rate method and Real-Time FTIR. The results demonstrated that epoxide dilute decreased the photocuring rate obviously and hydroxyl compound (HC) showed slight influence. But in a combination system, the HC exhibited unique dominative function on photocuring rate.  
        关键词：UV photocuring;Cationic;Bis-phenol A epoxy resin;Kinetic   
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        发布时间：2023-03-30
      • LIU Gang,YU Xuefeng,REN Diyuan,NIU Zhenhong,GAO Song
        Vol. 24, Issue 4, Pages: 201-204(2006)
        摘要：Two kinds of power MOSFET were irradiated by 60Co γ-rays in order to investigate their resistance to cosmic rays. The total dose radiation responses and voltage-current characteristics after 70℃ annealing were studied based on the changes of oxide charges and interface states induced by the irradiation. The results show that the P channel devices are more radiation resistant than the N channel devices.  
        关键词：Power MOSFET;Irradiation response;Annealing characteristics   
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        发布时间：2023-03-30
      • ZHA Yuanzi,LUO Wenyun,WANG Chaozhuang,XU Jiaqiang,WANG Chuanshan
        Vol. 24, Issue 4, Pages: 205-208(2006)
        摘要：The radiation environment of space accounts much for spacecrafts’ invalidation. Anti-Radiation shielding methods depend on the environment of space radiation and spacecrafts’ orbital altitudes as well as their life expectancy. Energy spectra of the geosynchronous orbit and Monte-Carlo simulation calculation are used in simulating simple satellite model’s shielding effects. Our calculation results are supported by experiments. A new view on anti-radiation shield design is then presented.  
        关键词：Electron beam;Spacecraft;Anti-Radiation shield;Monte-Carlo simulation   
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        发布时间：2023-03-30
      • SONG Weiqiang,TI Yongzhou,DENG Gang,LV Xiaohua,WU Chengxun
        Vol. 24, Issue 4, Pages: 209-213(2006)
        摘要：Hyperbranched polymers from maleic anhydride, diethanolamine and ethylene glycol were syntheized by a two-step method, and radiation effects on intrinsic viscosity of the polymers were studied. The results showed that intrinsic viscosity of all the hyperbranched polymers irradiated in their bulk phase, unlike the irradiated polymers in their solution, decreased obviously, Discussions were made on mechanisms of viscosity decrease.  
        关键词：Hyperbranched unsaturated polyesteramide;Intrinsic viscosity;Ionizing radiation   
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        发布时间：2023-03-30
      • WANG Dehai,LUO Yan,CAI Yanqing
        Vol. 24, Issue 4, Pages: 214-218(2006)
        摘要：Stereolithography (SL) is a process in which the 3D object is finished by the layer-by-layer curing, so the surface properties of the cured materials have notable effects on the bonding power between the layers. In order to investigate the properties and influence factors of the UV cured surface formed by the epoxy acrylate, probe components were used, and the surface properties of the cured films were characterized by means of contact angle measurement and ATR-FTIR analysis. The results showed that the probe components migrated during the curing process, which causes the inhomogeneity distribution of their contents from surface to inner of the layer, and in turn influences the surface energy of the cured layers. Notwithstanding their very low concentrations (0.01%) , the probe components caused a drastic change in the surface energy of the layers (Deuchem 467 made the surface energy decrease from 51.32 mJ m-2 to 35.05 mJ m-2 ). Besides, the diversity of the surface energy of the surface and interface was also observed. In conclusion, both chemical nature of the probe components and the curing process (curing atmosphere and substrates, etc) can affect the migration extent of the probe components.  
        关键词：Layers;Surface energy;Probe components;Migration;Attenuated total reflectance–Fourier transform infrared   
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        发布时间：2023-03-30
      • TONG Long,ZU Jianhua,LIU Xinwen,SUN Guisheng,YU Chunhui
        Vol. 24, Issue 4, Pages: 219-223(2006)
        摘要：Glycidyl methacrylate (GMA) was grafted onto HDPE membranes by pre-irradiation method with 1.8 MeV E-beams, and a kind of membranes having reactive epoxy groups was successfully synthesized. Effects of monomer concentration, reaction temperature and time and irradiation dose on the grafting yield were studied. Composition, thermo-property and surface morphology of the grafted membranes were studied by FTIR, DSC and Tapping-mode AFM, respectively. The FTIR measurements proved the synthesized copolymer is HDPE-g-GMA. The DSC results indicated the grafted HDPE’s melting temperature (Tm) and the heat of fusion (ΔHf (HDPE)) which was reduced with increasing grafting yield. The AFM images indicated that surface of the HDPE-g-GMA membranes was rougher than the virgin HDPE.  
        关键词：High density polyethylene membranes;Pre-irradiation graft copolymerization;Glycidyl methacrylate   
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        发布时间：2023-03-30
      • REN Jie,WU Lijun,WANG Rongfu,YANG Gen,WANG Jiabao,WU Yuejin,BIAN Po,YU Zengliang
        Vol. 24, Issue 4, Pages: 224-228(2006)
        摘要：Arabidopsis embryos were irradiated by 241Am α-particles to 1, 10 or 100Gy to study the irradiation effects. The results indicated that germination percentages of embryos were not affected by the irradiation in the dose range. Germination speed of the 1Gy group was 11.4% higher than that of control, whereas germination speed of the higher dose groups decreased, with germination speed of the 100Gy group being about 29.3%. The irradiation effect on root length was similar to the germination speed. Moreover, root gravitropism of the 100Gy group became S-shaped curves. In a mechanism study, the root gravitropism recovered while cultured in an MS medium containing 0.2mmol/L Vc, which indicated that H2O2 might joined the process of gravitropism. Furthermore, during shooting period of the Arabidopsis, the content of MDA was detected and the activities of SOD and CAT were observed. and the CAT activity and MDA content increased with the dose, while SOD activity of the 100Gy group decreased by 12.6% compared with the control. The results indicate that the induced increase of H2O2 signal molecules after the α-particle irradiation may be the mechanism of radiation physiological effects.  
        关键词：α particle irradiation;Arabidopsis embryo;Physiological effects;Root gravitropism   
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        发布时间：2023-03-30
      • WANG Feng,YU Zhengping,ZHANG Guangbing
        Vol. 24, Issue 4, Pages: 229-232(2006)
        摘要：The work is to observe retinal histopathology in rabbits at different hours after exposure to high peak power microwaves (HPPM), and to determine acute retina injury induced by microwaves. Twenty-eight Chinchilla rabbits were randomized into sham group and exposure groups of 0h, 3h, 6h, 12h, 24h and 72h after the exposure, and received sham exposure or 90W/cm2 microwave exposure for 15min. The acute effects of retinal histopathology after HPPM exposure were investigated by measuring the retinal layer thickness and cell counts of INL and GCL. The retina of all exposure groups have histopathological changes. The key time point was 6h after exposure. Thickness of the retina layer decreased significantly and the cell counts of INL and GCL increased significantly at 72h after exposure. Effects of the retinal histopathology have regular relation with the time after exposure. HPPM may bring about obviously early retina injure, as is evidenced by the histopathological effects that show the time-dependent feature.  
        关键词：High peak power microwave;Retina;Histopathology;Rabbit   
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        发布时间：2023-03-30
      • LI Hua,LIU Wen,LI Jinyan,ZUO Ji
        Vol. 24, Issue 4, Pages: 233-240(2006)
        摘要：To explore the effect of low dose radiation on chromosome non-disjunction, human lymphocyte were cultured and treated with 137Cs γ-ray (≤5Gy) and the metaphase chromosomes were counted. The results showed that the rate of aneuploid and hyperdiploid increased markedly after irradiation, and was dose-dependent and time-dependent. RT-PCR and Western blot were used to study changes of TOPOⅡα expression in the irradiated HeLa cells. A transient and significant decrease of TOPOⅡα after 5 Gy irradiation was detected: the decrease began at 4h after irradiation, reached to the lowest level at 12h, and began to return at 16h. The decreasing rate increased with the irrdiation dose, and decreasing rate was higher with multiple irradiations than a single irradiation of the same dose. The decrease of TOPOⅡα after irradiation was also time- and dose-dependent. The rate of aneuploid and hyperdiploid increased more significantly in Hela cells under the co-effect of TOPOⅡα inhibitor (VP-16) and irradiation. The results suggest that low dose irradiation may causes chromosome non-disjunction, and its mechanism is related with the change of TOPOⅡα expression.  
        关键词：Low dose irradiation;Chromosome non-disjunction;Topoisomerase Ⅱα   
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        发布时间：2023-03-30
      • CHEN Ying,LUO Yisheng,CAO Zhenshan,LIU Xiulin
        Vol. 24, Issue 4, Pages: 241-244(2006)
        摘要：To estimate accurately biological dose of the victims exposed to high dose, the dose-response curves of chromosome aberration induced by 6—22Gy 60Co γ-ray were established. Human peripheral blood in vitro was irradiated, then lymphocytes were concentrated, cultured 52h, 68h and 72h and harvested. The frequencies of dicentrics (multi-centrics) and rings were counted and compared between different culture times The dose-response curves and equations were established, as well as verified with high dose exposure accidents. The experiment showed that the culture time should be prolonged properly after high dose exposure, and no significant differences were observed between 52—72h culture. The dose-response curve of 6—22Gy fitted to linear-square model Y=-2.269+0.776D-7.868 ×10-3D2 and is reliable through verification of the accident dose estimations. In this study, the dose-response curve and equation of chromosome dic+r after 6—22Gy high dose irradiation were established firstly, and exact dose estimation can be achieved according to it.  
        关键词：Very high dose γ-ray;Chromosome aberration;Dose-response curve;Accident dose estimation   
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        发布时间：2023-03-30
      • SONG Jianyuan,CAO Jianping,LI Chong,ZHU Wei,SHENG Fangjun,FENG Shuang,HUANG Xiaofei,WANG Xiaoqiang,FAN Saijun,F. Eckardt-Schupp
        Vol. 24, Issue 4, Pages: 245-248(2006)
        摘要：High radiosensitivity of fibroblast cells (AT5BIVA cells) from skin of Ataxia-telangiectasia (A-T) patients were studied by comparing with GM0639 (GM cells) from the skin of healthy adult. Using SOD (superoxide dismutase) and MDA (malondialdehyde) kit, the activity of SOD and content of MDA in AT and GM cells irradiated to 0, 1, 2, 3, 4Gy by 60Co γ-rays were detected respectively. The dose-response curves of SOD and MDA in AT and GM cells were established. In the irradiated cells, the SOD activity of AT cells were significantly lower than that of GM cells (p<0.05), while the content of MDA of AT cells were significantly higher than that of GM cells (p<0.05). In the two cell types, the activity of SOD had a negative correlation with the irradiation dose (Y=a-bX), whereas the content of MDA had a positive correlation with irradiation dose (Y=a+bX). The results show that the faculty of AT cells to cope with radiation-induced oxidative damage is significantly weaker than that of GM cells.  
        关键词：Ataxia-telangiectasia;Radiation;Superoxide dismutase;Malondialdehyde   
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        发布时间：2023-03-30
      • GUO Chuanling,WANG Jufang,JIN Xiaodong,LI Wenjian
        Vol. 24, Issue 4, Pages: 249-252(2006)
        摘要：Five kinds of malignant human tumor cells, i.e. SMMC-7721, HeLa, A549, HT29 and PC3 cell lines, were irradiated by 60Co γ-rays to 1—6 Gy in a single irradiation or two irradiations of half dose. The radiosensitivity was compared with the dose-survival curves and D50 and D10 values. Differences in the D50 and D10 between the single and fractional irradiation groups showed the effect of fractional irradiation. Except for PC3 cells, all the cell lines showed obvious relationship between radiosensitivity and biologic effect of fractional irradiation and the α/β value . A cell line with bigger α/β was more radiation sensitive, with less obvious effect of fractional irradiation. The results indicate that there were obvious differences in radiosensitivity, repair ability and biologic effect of fractional irradiation between tumor cells from different tissues. To some tumor cell lines, the relationship between radiosensitivity, biologic effect of fractional irradiation and repair ability was attested. The α /β value of single irradiation can be regarded as a parameter to investigate the radiosensitivity and biologic effect of fractional irradiation of tumor cells.  
        关键词：Tumor cells;Radiosensitivity;Biologic effect of fractional irradiation;Dose-survival curve   
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        发布时间：2023-03-30
      • XING Kefei,WANG Yueke,PAN Huafeng
        Vol. 24, Issue 4, Pages: 253-256(2006)
        摘要：A test platform was constructed for 60Co γ-ray irradiation experiment of microelectronics, with the aid of computer and a FPGA module. The tested sample devices included analog-to-digital converter AD10465, digital-to-analog converter AD9857, high density flash memory MEF64M16 and anti-fused PROM XQR17V16, which are used in signal processing module in spaceborne systems. Evaluations were made on their ability of resisting the total dose based on the proper function criterion of the devices. The results showed that AD10465 and AD9857 ran properly after 1.59kGy(Si) irradiation, but errors were found when MEF64M16 and XQR17V16’s total ionizing doze is 0.13kGy(Si) and 0.99kGy(Si), respectively.  
        关键词：AD/DA converter;Memory device;60Co γ-ray;Total ionizing dose;Radiation effect   
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        发布时间：2023-03-30
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