最新刊期
      期 2 ， 1985
      • Zhang Wanxi,Sun Jiazhen
        Vol. 3, Issue 2, Pages: 1-5(1985)
        摘要：The nucleation model for radiation-induced emulsion polymerization of styrene has been studied by measurement of diameter distribution of latex particles during primary stage of polymerization reaction and by the relationship between polymerization rate and emulsifier concentration, and the molecular weight distribution below the critical micelle concentration.It is shown that the nucleation model is both aqueous nucleation and micellar nucleation from the experiment.  
        关键词：Radiation-induced emulsion polymerization;Styrene;Micellar nucleation;Aqueous nucleation   
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        发布时间：2023-04-23
      • Ma Xiang Rui,Wang Tao,Wang Hong yun
        Vol. 3, Issue 2, Pages: 6-9(1985)
        摘要：The determination of the colony formation in agar culture is a good method for studying the proliferation of T lymphocytes inducted by PHA. The suspension of lymphocytes separated from the blood of ten healthy volunteers was used in our experiments, PHA (100 µg/ml) was chosen as a mitogen. The kinetics and radiosensitivity of T lymphocytes in human peripheral blood were studied comparatively using the techniques of agar culture (0.3% agar) and liquid culture. The data obtained from the study on the kinetics of T lymphocytes suggested that the number of T lymphocyte colonies increased with culture time within 12 days, the peak of 3H-TdR incorporation into lymphocytes in liquid culture occured at 5 th day after seeding. These data also demonstrated that the kinetics of T lymphocytes cultured in two kinds of environment were differnt. The study of the radiosensitivity of T lymphocytes in agar culture and in liquid culture showed that the decrease in the number of colonies and rate of 3H-TdR incopration were different in the dose ranges of 0~100 rads and 100~600 rads. i. e, the declining tendency in colonies formation or in 3H-TdR incorporation ratio was characterized by a biphasic change. In the range of 0~100 rads, the D0 values were 171.0 rads for colony-forming cells in agar culture and 434.0 rads for the proliferating T lymphocytes in liquid culture. In the range of 100~600 rads the D0 values were 588.0 and 736.0 rads respectively. The foregoing results demonstrated that T lymphocytes in human peripheral blood were not homogeneous in radiosensitivity and that the colouy technique was a more sensitive method to test the proliferating capability of cells in culture.  
        关键词：T-lymphocyte;Proliferation;Radiosensitivity;Colny   
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        发布时间：2023-04-23
      • Huang Guanglin,Chen Zefang,Han Yinxian
        Vol. 3, Issue 2, Pages: 10-15(1985)
        摘要：The water-swollen films of poly(vinyl alcohol) were crosslinked via electron-beam irradiation to form transparent hydrogel films, The material we obtained was weak and easily shattered. After slow dehydrating at room temperature then heating at 120~160℃ for 1~2 hours, it was reinforced due to induction of partial crystallization. The degree of crystallinity varies from 25% to 43%. The measurement of the mechanical properties of the crystallized hydrogel films showed that modulus and ultimate strength were improved.  
        关键词：PVA;Radiation crosslinking;Hydrogel;Heat treatment   
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        发布时间：2023-04-23
      • Hu Tianxi
        Vol. 3, Issue 2, Pages: 16-21(1985)
        摘要：When human erythrocytes were irradiated in vitro with lower energy soft x-ray, their EPM dropped markedly, This is of similar effect as treated with hard x-ray. Within the range of 43.9-1754.0 rad, the drop of erythrocyte EPM varied in proportion to irradiation dosages, When erythrocytes underwent irradiation of 43.9 and 1052.4 rad, its EPM changed with the lapse of time, At 4 hrs after irradiation, the erythrocyte EPM dropped to its minimum, then gradually recovered. For samples irradiated with 43.9 rad, their EPM recovered to its original level 24 hrs later, but not for samples with 1052,4 rad irradiation.When the erythrocytes were suspended in their own plasma, their EPM was lower than in normal saline, but when irradiated plasma was added (1:1) into saline suspension of normal erythrocytes, no EPM change was induced. However, when irradiated erythrocytes were suspended in normal saline, their EPM dropped Markedly. Furthermore, the dropped EPM might be recovered if CDP-choline was added into irradiated erythrocyte suspension.  
        关键词：Soft x-ray;Irradiated erythrocyte;Cell membrane charge;Electrophoretic mobility (EPM);Plasma   
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        发布时间：2023-04-23
      • Zhang Yuhua,Zhi Huapeng,Wu Jilan
        Vol. 3, Issue 2, Pages: 22-26(1985)
        摘要：A drop in the sulfonic acid group was inhibited effectivly by pyridine when the polystyrene sulfonic acid resin was soaked in water under γ irradiation, its protective efficiency was better than potassium nitrate about ten times. In the presence of Na2SO3, TEA had a similar protection action on resin.According to kinetic analysis at the interface of ion exchange resin has happened possible charge transfer between H2O+ and pyridine, TEA.  
        关键词：Radiolysis of polystyrene sulfonic acid resin;Protection;Pyridine;TEA;Charge transfer;Spur reaction   
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        发布时间：2023-04-23
      • Yang Fengtong,Lu Shaoping,Peng Wenzhen,Xu Chengxiong
        Vol. 3, Issue 2, Pages: 27-32(1985)
        摘要：The effects of dose fractionation on the survival rate, the numbers of bone marrow cells (BMC) and hemopoietic stem cells (CFU-S) per femur, and the self-renewal capacity of the CFU-S in ICR/JCL and LACA mice were investigated. It was found that dose fractionation affected the mouse survival rate significantly. At 2 months after 18 Gy irradiation, the survival rates of mice received 6 doses of 3.0 Gy and 4 doses of 4.5 Gy were about 40% and 15% respectively, but all mice died after 3 doses of 6.0 Gy. When the total dose of 12 Gy was split into 2-4 fractions, most mice survived more than 5 months. Although the number of BMC per femur recovered to normal or near normal level after 2 months of irradiation, the number of CFU-S per femur was only about 40% and the self-renewal capacity of the CFU-S was only about 25% of the age-paired controls. This kind of hemopoietic residual damage remained unchanged up to 11 months after irradiation and no significant differences were found among the various dose fractionation groups.  
        关键词：Residual radiation injury;Hemopoietic stem cell;Dose fractionation   
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        发布时间：2023-04-23
      • Chen yuan,Zhou Mei
        Vol. 3, Issue 2, Pages: 33-37(1985)
        摘要：According to data in literature and the author's work, we discussed following topics:1) Changes of VE content in cells after irradiation; 2) Effects of VE deficiency on radiation-induced lipid peroxidation; 3) VE protection against radiation-induced lipid peroxidation; 4) Application of VE to the prophylaxis and treatmemt of radiation damage. The results of experiments showed that VE content in cells decreased after irradiation; VE deficiency increased cell sensitivity to radiation-induced lipid peroxidation; and VE Could efficiently protect cells against radiation-induced lipid peroxidation. But, the effects of its experimental clinical application to radiation damage were inconsistent, there were possitive as well as negative effects. The authors analysed the possible causes which produced the different effects.  
        关键词：Radiation effect;Vitamine E;Lipid peroxidatilon;Radiation-induced lipid peroxidation   
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        发布时间：2023-04-23
      • Wu Zhili,Xie Leidog,Lin Weizhen,Li Naining,Chen Xinwei
        Vol. 3, Issue 2, Pages: 38-43(1985)
        摘要：In this work We have investigated the question with relation to dose rate measurement before commissioning of 4.44×1015 Bq 60Co γ irradiation plant. Under the experiment conditions we made the ferrous sulphate and the ceric sulphate dosimeter standardization, and the precision of measured values are studied, and statistical methed of data processing is applied in the work. Then, the dustribution curves of dose rate are given.  
        关键词：Ferrous sulphate dosimeter;Ceric sulphate dosimeter;Statistical method of data processing;Dose rate measurement;Dose rate distribution curves   
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        发布时间：2023-04-23
      • Zhang Wanxi,Sun Jiazhen
        Vol. 3, Issue 2, Pages: 44-50(1985)
        摘要：The effects of various factors on the radiation -induced emulsion polymerization of styrene in soap-free system and the kinetics of growth of latex particles have been studied. It has been found that the monomer-water ratio influence on the rate of polymerization (RP) and the stability of latices, and rate of polymerization is proportional to dose rate (I) to the 0.5 power, i. e., RP∝I0.5. The activation of this polymerization system is 7.5 kcal/mole. The molecular weight of polymers are with in the range of 104~105. The molecular weight distibution of polymer latices is narrower than that of polymer latices obtained in chemical-initiated emulsion systems.On some specified condition, monodisperse particle size, "clean" latices can be obtained. The mechanism of emulsion polymerization in soap-free system have been suggested.  
        关键词：Styrene;Radiation-induced emulsion polymerization;Polymer latex;Mechanism of emulsion polymerization;Latex particles;Growth kinetics of latex particles   
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        发布时间：2023-04-23
      • Yang Xiuhuan,Zhu Yongliang,Zhu Xian,Liu Liqun,Zhang Zhanxia,Tang Paoying,Zheng Xianyang
        Vol. 3, Issue 2, Pages: 51-54(1985)
        摘要：Tests on phenols have been performed to investigate their destruction behavior after treatment with gamma radiation under static system. The irradiation was carried out in a 60Co gamma source. A notable destruction of phenols was found ralated to the PH, dose rate. oxygen and composition of the medium.When the water sample (contained 100 ppm of phenol) was adjusted to PH 5, saturated with oxygen and irradiated with a dose rate of 1235 rad/min the phenol destruction percentage was 99.5%.  
        关键词：Radiation destruction;Phenols;60Co-gamma source;Irradiation dose rate   
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        发布时间：2023-04-23
      • Lang Shuyu,Zhang Zhonglun,Meng Xiangqin
        Vol. 3, Issue 2, Pages: 55-60(1985)
        摘要：The characteristics of the model BPT thimble TE-TE and Mg-Ar ionization chambers have been studied. The correc tion factors of the ionization chambers in mixed field produced by T(d,n) 4He reaction were measured and calculated. The saturation correction factors is 1.007 and 1.017 for TE-TE(500V) and Mg-Ar (200V) chambers respectively in the mixed field. The absorbed doses in the samples of glucose and FBX(Ferrous Sulphate-Benzoic acid-Xylenol orange) in 15 MeV neutron field were measured by the twin chamber method. The rations of absorbed doses of neutrons and γ-rays in the samples were presented. The uncertainty of absorbed dose measurement was ±6.3% for the mixed field.  
        关键词：Twin chamber mathod;Neutron absorbed dose;Tissue equivalent ionization chamber;Neutron -γ ray mixed field   
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        发布时间：2023-04-23
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