最新刊期
      期 4 ， 2008
      • XING Zhe,WU Guozhong,HUANG Shirong,ZENG hongyan
        Vol. 26, Issue 4, Pages: 193-198(2008)
        摘要：The radiation cross-linked low-density polyethylene (LDPE) foams have been formed by use of supercritical carbon dioxide (scCO2) as a blowing agent at a batch scale. The effect of irradiation with different radiation doses on melt temperature and crystallization of LDPE has been characterized by a differential scanning calorimeter (DSC). The morphology of resulting microcellular structures has been investigated by scanning electron microscopy (SEM). The effects of radiation dose, treated temperature and pressure on morphology of the radiation cross-linked LDPE foams are studied in detail. The optimum radiation dose for the foaming of LDPE is found to be 50 kGy. Higher foaming temperature results in larger cell size and lower cell density, while higher saturation pressure leads to smaller cell size and higher cell density. Furthermore, the radiation cross-linked LDPE shows an improved thermal stability and foamability in comparison with the original LDPE.  
        关键词：Low-density polyethylene;Supercritical carbon dioxide;Radiation;Microcellular foam   
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        发布时间：2023-03-30
      • WANG Hong,DENG Zhangqiong,SUN Jiazhen
        Vol. 26, Issue 4, Pages: 199-203(2008)
        摘要：Al2O3/SiO2 /PAN composite membrane was prepared as the separator for Li-ion batteries in order to replace the traditional microporous polyolefin membrane. PAN was polymerized by irradiation of 60Co γ-ray. The composite membrane has high porosity, and can be well wetted by liquid electrolyte. The amphoteric character of Al2O3/SiO2 can scavenge acidic hydrogen fluoride, which is inevitably present in the LiPF6-based electrolytes used currently in the Li-ion batteries. With the composite membrane as a separator, the graphite/cathode cell exhibited good capacity retention. It is also found that the Li-ion cell fabricated in this manner not only has stable capacity retention, high temperature safety, but also shows good high-rate performance and overcharge proof performance.  
        关键词：Radiation;Separator;Li-ion battery;Ion conductivity;Cycle life   
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        发布时间：2023-03-30
      • CHEN Jian,JIANG Pingkai,HUANG Xingyi,WANG Genlin
        Vol. 26, Issue 4, Pages: 204-209(2008)
        摘要：The effects of high doses (0~2.0 MGy) of gamma irradiation, at room temperature and in the presence of air, on the mechanical, electrical and thermal behavior of styrene-ethylene-butadiene-styrene/polystyrene (SEBS/PS) blends (100/0~50/50) has been studied. From the obtained results, it has been indicated that the gamma irradiation stability of SEBS was enhanced by blending with PS. After the irradiation treatment, the tensile strength, volume resistivity of blends decreased and the dielectric dissipation factor of blends increased as the absorbed dose increased. Thermal analysis data show that the introduction of PS improved the thermal property of the blends. The decrease of polyolefin content with addition of PS in the blends made the elongation at break of blends decrease intensively with the increasing of absorbed dose, especially at high doses.  
        关键词：Styrene-ethylene-butadiene-styrene (SEBS);Polystyrene (PS);Gamma irradiation;Mechanical prop- erty;Electrical property;Thermal stability   
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        发布时间：2023-03-30
      • YANG Qiang,SUN Chaoming,BI Yamin
        Vol. 26, Issue 4, Pages: 215-223(2008)
        摘要：The structure and properties of polysulfone under irradiation by gamma rays were investigated by mechanical testing, fourier transform infrared spectroscopy, scanning electronic micrograph, differential scanning calorimeter, gel permeation chromatography and X-ray photoelectron spectroscopy respectively. The results show that tensile strength, flexural strength, impact strength, number averaged molecular weight, peak molecular weight, glass transition temperatures and number averaged polymerization degree of polysulfone decrease with the absorbed dose. The chemical structure of polysulfone keeps unchanged. The embrittlement of material and the smoothness of the fracture surface increase with the absorbed dose. The ascending part of the aging curves of flexural strength, impact strength and weight averaged molecular weight of polysulfone reveale that the cross-linking mechanism dominates at lower absorbed doses, and descending part of the curves shows that degradation mechanism dominates at higher doses. Radiation degradation kinetics of polysulfone under gamma irradiation can be described as random event. It may be indirectly proved that cross-linking mechanism dominates at low absorbed doses, and degradation mechanism dominates at higher absorbed doses.  
        关键词：Polysulfone(PSU);radiolysis;γ-ray irradiation   
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        发布时间：2023-03-30
      • RAO Yalan,DONG Bo,CONG Yue,CHEN Xiaohua,ZHANG Junquan,LI Fengsheng,GAO Lin,MAO Bingzhi
        Vol. 26, Issue 4, Pages: 224-227(2008)
        摘要：The study explores the expression of calcium-binding protein S100A8 and the relationship between S100A8 and cell cycle or apoptosis in bone marrow cells of mice with radiation injury. The protein/DNA bi-parameter flow cytometry method has been used to analyze the change of S100A8 protein expression and the difference in cell cycle or apoptosis between S100A8 positive and S100A8 negative cells in bone marrow of mice at 6h after irradiation with 3.5 or 7 Gy 60Co γ-ray in vivo. In the normal bone marrow of mice, S100A8 positive cells are mainly granulocytes, and they are inactive in cell proliferation compared to S100A8 negative cells. At the early phase of radiation injury, the proportion of S100A8 positive cells and the expression level of S100A8 protein have no significant change in bone marrow of mice; G2/M arrest and apoptosis occur in S100A8 negative cells, but no change of cell cycle and apoptosis occur in S100A8 positive cells. These phenomena suggest that S100A8 positive cells in bone marrow of mice are radiation resistant compared to S100A8 negative cells.  
        关键词：S100A8;Radiation injury;Bone marrow;Mouse   
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        发布时间：2023-03-30
      • LIU Qingfang,LI Wenjian,ZHOU Libin,QU Ying,DONG Xicun,LU Dong,YU Lixia,HE Jinyu,XIE Hongmei
        Vol. 26, Issue 4, Pages: 228-232(2008)
        摘要：The hypocotyls and cotyledons of Medicago sativa were irradiated with original energy 100 MeV/u heavy ion beam 12C6+. The effects of irradiation on the growth state and the callus induction rate, the callus relative growth rate, the somatic embryogenesis rate and plantlet regeneration were studied. The results show that heavy ion beam irradiation can inhibit the callus induction of the hypocotyls and cotyledons, and the frequency of callus declines gradually with the increment of irradiation doses. In the course of subculture, their callus relative growth rates are higher than that of the controls, and the hurt caused by irradiation has been restored. The heavy ion beam irradiation has an influence on the somatic embryogenesis rate. The somatic embryo induced by the hypocotyls irradiated up to 30 Gy formed earlier and the number is larger while irradiated at 50 Gy there is no plant obtained. The results of RAPD (Random amplified polymorphic DNA) analysis on the control and the plants induced by the hypocotyls irradiated within 10~40 Gy suggest that eleven among twenty random primers have been amplified with different DNA polymorphism bands. Consequently, heavy ion beam irradiation could cause mutation of alfalfa genome DNA.  
        关键词：Heavy ion beam;Medicago sativa;Hypocotyl;Cotyledon;In vitro culture;RAPD (Random ampli- fied polymorphic DNA)   
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        发布时间：2023-03-30
      • PENG Xiaomei,CAO Jianping,ZHU Wei,FAN Saijun,WANG Xiaoqiang,HUANG Xiaofei,LIU Yang,CHEN Xialin,GONG Xiaomei,ZENG Jing
        Vol. 26, Issue 4, Pages: 233-236(2008)
        摘要：To detect the rate of lymphocyte Chromosome aberration by conventional chromosome production and ultraviolet plus Giemsa technology (UpG), after the human peripheral blood irradiated by 60Co γ-ray, and the dose-response relationship of the rate of chromosome aberration was discussed. The feasibility of UpG applied in dose estimation was discussed. The results show that the rate of chromosome aberration is closely related to dose (P<0.05).Compared the conventional method to UpG, the result of UpG is higher, and a extremely statistically difference was observed between two methods (P < 0.05). These results show that a well relationship of dose-response can be established by UpG, and accurate and sensitive.  
        关键词：Chromosome aberration;Ultraviolet plus Giemsa technology;Dose-effect   
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        发布时间：2023-03-30
      • QIN Guoxiu,LIU Qingcheng,LIU Yi,ZHANG Chengyong
        Vol. 26, Issue 4, Pages: 237-241(2008)
        摘要：In this paper the estimation of method and application of individual radon and its daughters radiation, which is based on the data collection in uranium mine, has been carried out. By use of the method combined with the collected data, the individual dose method of radon and its potential α concentrations is suitable to estimate the personal radiation dose. However, there are more errors with the individual dose method of balancing radon concentration, which can be used to identify key sub-areas and key sub-groups in the large-scale environmental radiation assessment.  
        关键词：Radon and its daughters;Radiation;α concentration;Equilibrium equivalent radon concentration   
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        发布时间：2023-03-30
      • GUO xiongbin,LIU Yajian,FU Junjie,ZHANG Yuehong,JIN Zuoxian,TAN Yuanyuan,YUAN Jingqun
        Vol. 26, Issue 4, Pages: 242-245(2008)
        摘要：To rapidly detect whether the rice has been treated with irradiation to eliminate quarantine pests, the changes of starch viscosity profile of glutinous rice after irradiation were studied. The results show that the starch viscosity decreases dramatically with increasing the absorbed dose and under the regulation of detection auxiliary. The absorbed doses could be estimated with the relation between the peak viscosity, the hot paste viscosity, the cool paste viscosity and irradiation dose respectively. With the regulation of detection auxiliary we could rapidly detect whether the rice has been treated with irradiation.  
        关键词：Rice;Irradiation;Starch viscosity;RVA profile;Detect   
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        发布时间：2023-03-30
      • SONG Qinghuan,DENG Gang,MENG Chuang,ZHANG Hongna,TI Yongzhou,SONG Weiqiang
        Vol. 26, Issue 4, Pages: 246-248(2008)
        摘要：The effects of absorbed dose and a self-made compatibilizer on properties of the radiation vulcanized CR/PAANa water-swellable ruber has been studied. The results indicate that the mechanical performance and the equilibrium swelling ratio increase meanwhile the mass loss ratio decreases with increasing the amount of the compatibilizer. And the mass loss ratio decreases with increment of the absorbed dose.  
        关键词：Water-swellable rubber;γ-ray vulcanization;Compatibilizer   
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        发布时间：2023-03-30
      • LI Shangzhi,LIU Qingfang
        Vol. 26, Issue 4, Pages: 249-252(2008)
        摘要：On the basis of practical application combined with current domestic study, to provide evidences for the selection of appropriate dose setting method. In our test 148 samples collected were from 52 manufacturers all over China. After bioburden estimate, the dose setting was performed with ISO11137 method 1 along with other two method (Ig method and VDmax(-1) method). The bioburden on product ranges from 7.17 to 1.98×105cfu/unit. On the same level of bioburden, the sterilization dose from ISOl1137 method 1 is more than that from Ig method. Both of them are less than that from VDmax (-1). It is thought that the VDmax(-1) method is perfect for product with less contamination, ISO11137 method 1 is perfect for produced regularly. The dose safety of Ig method which used in china is suspicious.  
        关键词：Radiation sterilization;Bioburden;Dose setting;Medical healthcare products   
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        发布时间：2023-03-30
      • WANG Junling,WANG Weidong,ZHU Xiaorui,QIN Guangyong
        Vol. 26, Issue 4, Pages: 253-256(2008)
        摘要：In order to study the peroxidation reaction of erythrocyte and erythrocyte membrane and their protection with Vc involved in radiation from UV, alternate biological model has been used with erythrocyte and erythrocyte membrane, which is isolated from fresh pig blood. Hemolysis in erythrocyte and peroxidation in erythrocyte and erythrocyte membrane has been measured by the spectral photometer and the thiobarbituric acid (TBA) reaction. With the increment of UV radiation dose and deposited time, the hemolysis in erythrocyte increases, and the peroxidation of erythrocyte membrane also increases when radiation dose is up to some value. However, the peroxidation of erythrocyte hasn’t been observed while radiation dose is low. In our study, the bigger concentration of Vc, the more obvious protection to erythrocyte membrane. But the protection of Vc to the erythrocyte is not evidence.  
        关键词：UV-Radiation;Erythrocyte;Erythrocyte membrane;Vc   
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        发布时间：2023-03-30

        研究论文

      • MU Qing,DING Zhijia,FANG Yue’e
        Vol. 26, Issue 4, Pages: 210-214(2008)
        摘要：Poly (acrylic acid)-modified chitosan amphiphilic gels were prepared via O-maleoyl-N- phthaloyl- chitosan as an intermediate by grafting with poly (acrylic acid). The reaction was carried out in a homogeneous system by γ-ray irradiation. Evidence of grafting was obtained from FTIR spectroscopy. The effects for grafting reaction were investigated systematically. Results show that the grafting degree depends on monomer concentration and absorbed dose. The swelling behavior of chitosan samples with different grafting degree was studied in different buffers as a function of pH. It can be found that all the samples swollen slightly at low pH but very well at high pH. Moreover, the swelling behavior of chitosan samples in DMF has been evaluated.  
        关键词：Chitosan;Acrylic acid;Radiation induced grafting;pH sensitivity   
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        发布时间：2023-03-30
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