最新刊期
      期 3 ， 1993
      • He Yongke,Liu Tianwei,Yuan Rongyao,Wu Jilan
        Vol. 11, Issue 3, Pages: 129-134,150(1993)
        摘要：A study was made on radiolysis of glycyrrhizic acid in dilute aqueous alkaline solution. Radiolysis of glycyrrhizic acid would be divided into two processes: (1) Chromophore (unsaturated ketones) was destroyed; (2) Structure of glycyrrhizic acid was destroyed due to hydrogen abstraction reaction, but chromophore was not destroyed. The G values of radiolysis of glycyrrhizic acid under different atmospheres have been determined. Four radiolytic products were separated by HPLC. Using scavenger method, it showed that glycyrrhetinic acid and unknown products are formed by OH attack. OH attack leads to glucosidic bond rupture. Unknown product is formed by OH and HO2. Unknown Ⅲ may be secondary product. Using competition kinetics kOH-GAH~1010dm3mol-1s-1 was got.  
        关键词：Glycyrrhizic acid;Glycyrrhetinic acid;Glycyrrhiza;Sodium formate;Radiolysis   
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        发布时间：2023-04-23
      • Zhang Zhonglun,Su Zhen,Zheng Yanzhen,Liu Xiaomei
        Vol. 11, Issue 3, Pages: 135-138(1993)
        摘要：Glow curve of LiF thermoluminescence dosimeter consists of several peaks. Dose response of the main dosimetry peak in LiF present saturation at high dose.The response of various peaks can be analysed using computerised glow curve deconvolution. Ratio of peak 8 to peak 5 glow peak areas is proportional to log(dose) in 103—105 Gy dose range. The relationship can be used for high dose measurements.  
        关键词：LiF;Thermoluminescence;Radiation dosimeter   
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        发布时间：2023-04-23
      • Zhou Ruimin,Yuan Hongyu
        Vol. 11, Issue 3, Pages: 139-142(1993)
        摘要：Grafting polymerization of hydroxyethyl methacrylate on low density polyethylene film has been studied using direct method. An effect of radiation dose, dose rate, concentration of cupric ion and polar monomer on grafting rate of polyethylene has been discussed. The grafted product was characterized by infrared spectrum. It was found that the electric capacity of grafting copolymer increase with increasing of grafting rate.  
        关键词：Low density polyethylene;Hydroxyethyl methacrylate;Radiation grafting   
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        发布时间：2023-04-23
      • Yu Li,Zhong Xiaoguang,Zhao Wenwei,Zhang Yuefang,Sun Jiazhen
        Vol. 11, Issue 3, Pages: 143-146(1993)
        摘要：In this work the radiation effects of CPE/LDPE blends with different composition were studied. The obtained results prove the suitability of equation describing the relation between irradiation dose and sol fraction given in reference. The enhance effect of CPE on radiation crosslinking of blends was observed.  
        关键词：Radiation crosslinking;Blend;Heat of fusion;Melting point;Chlorinated polyethylene;Low density polyethylene   
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        发布时间：2023-04-23
      • Zhang Wanxi,He Zhongda,Li Shuzhong
        Vol. 11, Issue 3, Pages: 147-150(1993)
        摘要：In this paper, the relationship between sol fraction (S) and irradiation dose (R) in the radiation crosslinking of LLDPE/EVA blend and LLDPE/EPDM blend was studied. It was found that the Charlesby′s and Chen-liu-Tang′s expression, which are only in good agreement with radiation crosslinking of some polymers, do not fit to the radiation crosslinking of LLDPE/EVA and LLDPE/EPDM blends. A expression characterizing S-R relationship for polymer blends was established as follows: and βb=∑Wiβi. The results calculated from the above expression are in good agreement with ones obtained from the experiments.  
        关键词：Polymer blends;Radiation crosslinking;Sol fraction;Irradiation dose;Low density polyethlene;Ethylene-vinyl acetate copolymer;EPDM   
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        发布时间：2023-04-23
      • Lin Xiao,Chen Jie,Xu Jiping
        Vol. 11, Issue 3, Pages: 151-155(1993)
        摘要：The structures of membranes plasma-polymerized trimethylvinylsilane (VTMS), dimethylvinylethoxysilane (DMVEOS) and vinyltriethoxysilane(VTEOS) were investigated by IR and XPS. The substituent effects of ethoxy groups were studied on the chemical composition and properties of plasma polymers. Such differences in chemical compositions reflected on surface energy and gas permeability of the plasma films.  
        关键词：Organic silicons;Plasma polymerization;IR;Composite membrane;Gas permeability   
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        发布时间：2023-04-23
      • Ding Lianzhong,Wu Zhengdong,Jiang Ping,Chen Zulin,Fu Jianxin,Shi Jianqing
        Vol. 11, Issue 3, Pages: 156-159(1993)
        摘要：Technical feasibility about the preservation of Antheraea pernyi′s eggs, which are used as middle hosts of Trichogramma dendrolimi Matsumura, irradiated by electron beam is studied in this paper. The effects of radiation dose, storage temperature on preservative time of eggs are discussed. The results reveal that the preservative time of Antheraea pernyi's eggs irradiated by electron beam, combining with storage in a refrigerator, is notably prolonged in contrast with the control. When the irradiated eggs stored in a refrigerator for 89 days are serviced as hosts, the parasitic percentage for Trichogramma dendrolimi Matsumura is about 80%. Besides, the emergence percentage, average numbers of parasitoids reproduced out of one egg, as well as body size, growing stage periods, and the sexual rate of descendant are all normal. Irradiated eggs have not any adverse effects on the abilities of Trichogramma species and their offspring in both bearing and controlling insect pests.  
        关键词：Host eggs;Antheraea pernyi;Trichogramma dendrolimi Matsumura;Electron beam;Irradiation;Preservation   
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        发布时间：2023-04-23
      • Deng Qiaobing,Liu Shaode
        Vol. 11, Issue 3, Pages: 160-163,155(1993)
        摘要：Zhi Hua mango (Mangifera indica L.) was treated using calcium infiltration and radiation. Biochemical and physiological aspects during mango storage were researched. The results that the treatment of CaCl2 with radiation (dose of 0.25 kGy) can retard Malic enzyme activity, and rediation can also cause effects on the transparation of Ca++ and release of CO2 and ethylene. The mango treated using above way is the best from view of sense organ. However it does not delay maturity of mango to use Ca++ treatment alone.  
        关键词：Mango;Calcium infiltration;Irrradiation;Borwning;Malic enzyme activity   
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        发布时间：2023-04-23
      • Wu Jilan
        Vol. 11, Issue 3, Pages: 164-166(1993)
        摘要：A short summary of the programmes of "ADMIT" (FAO/IAEA)and the developments in analytical detection methods for radiation processed foods has been given. It is suggested that for promoting the commercialization of radiation processed foods and controling its quality, we must pay more attention on the study of analytical detection methods of irradiated food.  
        关键词：Irradiated food;Analytical detection method;Radiation   
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        发布时间：2023-04-23
      • Zhu Shoupeng,Yang Zhunshan,Xia Fen
        Vol. 11, Issue 3, Pages: 172-175,171(1993)
        摘要：In this article the dynamic retention of fission products 134Cs and 147Pm as well as the proliferation ability on cells of bone marrow and thymus of rats were investigated. The retention equation of 134Cs was well described by a two-exponential function, that is: R(t)=18.04 e-9.3175t+45.13 e-0.0423t. There are two retention components, fast and slow. The effective biological T1/2 were 0.07 and 16.14 days respectively. While the retention equation of 147Pm is: R(t)= 0.199e-0.1452t +0.812 e-0.0008t. Where the fast component T1 was 4.77 d; and the slow compoment T2 was 866.3 d. Results show that the proliferation of bone marrow cells and thymus cells were excited with a low dose internal irradiation of 134Cs from 0.37 to 1.85 kBq/g and of 147Pm from 0.185 to 0.74 kBq/g. It showed that a stimulatory resporse of cell proliferation induced by low doses of 134Cs and 147Pm has been obser ved.  
        关键词：Low dose;Interna Iradiation;147Pm;134Cs;Bone marrow cells;Thymus cells;Stimulatory effect   
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        发布时间：2023-04-23
      • Luo Liming,Jin Yizun,Lin Nianyun,Zheng Rongliang
        Vol. 11, Issue 3, Pages: 176-179(1993)
        摘要：SCE was studied in human lymphocytes exposed to 60Co-γ ray and superoxide radical. Both γ-ray and superoxide radical produced a statistically significant increase in SCE over baseline. Dose-response relationships were observed. But a 2-fold increment of SCE wasn′t reached in both agents. SOD and mannitol have preventive effect on the damage caused by active oxygen species.  
        关键词：Sister chromatid exchange;Ionizing irradiation;Superoxide anions;Free radical scavenger;Lymphocytes   
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        发布时间：2023-04-23
      • Zhang Hongyuan,Cai Ping,Wang Lanjin
        Vol. 11, Issue 3, Pages: 180-183(1993)
        摘要：The paper reports on the changes of combined chromosome aberrations induced γ-rays irradiation and benzene in human blood lymphocytes. The results were summarized as follows: The chromosome and chromatid type aberrations can be induced by benzene. Neither dicentics nor rings were observed. When the cells were treaded with benzene, the yieald of chromosome aberration induced by radiation can be enhanced. In the definite dose range, the chromosome aberrations induced by radiation combined with benzene were increased as benzene concentation increasing for gave radiation dose. Benzene concentration and total aberration cells give a good fit to the linear regression equation. There were good relations between doses of radiation combined with tree variant benzene concentration and chromosome aberration rate. All of them give a good fit to the power regression equation.  
        关键词：γ-radiation;Benzene;Combined effect;Chromosome aberration   
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        发布时间：2023-04-23
      • Wang Bing,Zhou Xiangyan
        Vol. 11, Issue 3, Pages: 184-188,192(1993)
        摘要：Pregnant adult C 57 BL/6 J strain mice, randomly assigned to 1 of 4 experimental groups, were irradiated with exponentially decreasing doses of tritium beta-rays but group 1 (used as a control) by single injection of tritiated water(HTO) at their 12.5 th day of gestation. Offsprings of male, received accumulative doses of 0, 0.5, 0.10 or 0.30 Gy in uterus were trained or examined on learning and memory ability or with behavioral tests. Significant dose-response relationships for alternations in those tests were found due to exposure to 0.10 Gy or above. These results indicate that exposure to HTO during the fetal period in mice results in dose-dependent alteration in postnatal behavior, learning and memory ability. 0.05—0.10 Gy exposure may represent a threshold for the experimental conditions of this research using these parameters.  
        关键词：Tritiated Water;Internal irradiation;Threshold brain develepment;Beshavior test;Learning and memory ability;Animal experiment;Mouse   
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        发布时间：2023-04-23
      • Cao Xia,Wang Tao,Li Yanyi
        Vol. 11, Issue 3, Pages: 189-192(1993)
        摘要：The kinetics, metabolism and radiosensitivity of T-lymphocytes in peripheral blood and colony forming unit-T lymphocyte (CFU-TL) were studied with technique of tissue culture with methycellulose and 3H-TdR incorporation. The linear relationship was observed between the number of CFU-TL and the planted mononucleus cells at a certain concentration of cells. The number of colonies increased with planted cells in the range of (0.5—1.5)×105. It was found that in the cells cultured for 12 days, 3H—TdR incorporation still can be achieved but incorporation was lower than that in fresh separated mononucleus cells, which suggests decreased in the exposed cells. After γ-irradiation, both the number of colonies and CPM of 3H-TdR incorporation decreased rapidly. The result indicates that CFU-TL is more sensitive, D0=2.3 Gy.  
        关键词：T-lymphocyte colony forming unit (CFU-TL);Proliferation characteristic;Radiosensitivity;Biological radiation effects   
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        发布时间：2023-04-23
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