最新刊期
      期 3 ， 1987
      • Zhang Wanxi,Sun Jiazhen
        Vol. 5, Issue 3, Pages: 1-5(1987)
        摘要：The preparation of monodisperse polymer latices by means of the radiation-induced emulsion polymerization of styrene below C. M. C. of emulsifier have been studied. It has been found that polymerization condition (monomer concentration, dose rate, emulsifier concentration, temperature) influences the polymer latex size. The diameter of polymer latex particles is within the range of 600×10-10m~400 ×10-10m. The diameter of polymer latex particles can be controlled by polymerization condition. A relationship between the diameter of polymer latex particles and polymerization condition in our experiment is obtained as follows:  
        关键词：Radiation-induced emulsion polymerization;Styrene;Monodisperse polymer latices;Diameter of particles   
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        发布时间：2023-04-23
      • Zhang Wanxi,Zhang Yuefang,Sun Jiazhen
        Vol. 5, Issue 3, Pages: 6-9(1987)
        摘要：Fluoropolyimide (FPI) is a new type of polyimide with good resistance to high temperature and hydrolysis. However, until now, no research work on the radiation induced crosslinking of FPI has been done. We have found that it crosslinks only at high temperature and the mechanical properties at high temperature and glass transition temperature(Tg) of radiation crosslinked FPI are improved remarkably. In this paper, the characterization of crosslinking density of FPI has first been studied with XPS. The gelation dose of FPI obtained by XPS method is 50 Mrad.  
        关键词：Radiation crosslinking;Fluoropolyimide;X-ray photoelectron spectroscopy (XPS)   
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        发布时间：2023-04-23
      • Meng Xiangshun,Zheng Xiulong,Zhu Yuao,Zhao Fang,Gao Jianguo
        Vol. 5, Issue 3, Pages: 10-14(1987)
        摘要：This study has compared radiosensitization effects of metronidazole derivative (CM) after 8, 24 and 32 Gy r-ray irradiation in S180 bearing mice as a model of tumor. After comparing the ratio of Vt/Vo, the inhibition rate of tumor volume, the tumor grwth delay, the treatment efficiency, ratio of the area of growth curve and the average survival time, the results showed that CM has more effective radiosensitization effects at lower does level (8 Gy)than at higher dose levels (24, 32 Gy). In the latter case, there was no obvious statistical difference.  
        关键词：radiosensitizer;sarcoma180;metronidazole derivative   
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        发布时间：2023-04-23
      • Chen Wenxiu,Chen Xiaomao,Jia Haishun
        Vol. 5, Issue 3, Pages: 15-19(1987)
        摘要：The period of conversion from alkyl radicals to polyengl radicals in gamma-irradiated isotactic polypropylene (i.e. PP) is ≲ 6 days; while in 6.8%APP and 7.6% EPP (APP and EPP are PP containig hexadecane and hexadecene-1, respectively). It was found to be more than 10 days. It was also measured that the initial gelation dose of PP, 6.8% APP, 4.0% EPP and 7.6%EPP are 12.6, 20.7, 30.5 and > 108 Mrad, respectively. This indicates that both of the additives inhibit the radiation crosslinking of PP, and hexadecene-1 shows a stronger effect than hexadecane. It was assumed that hexadecene-1 offers its active allyl H atoms to reduce the radical yield of PP, and then inhibit the radiation crosslinking of PP more strongly than hexadecane. However, the whole mechanism related to the effect of the additives on PP radical connversion needs further research.  
        关键词：Isotactic polypropylene;additives;hexadecane;hexadecene-1;Radiation effect;radical conversion;Radiation crosslinking   
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        发布时间：2023-04-23
      • Chen Deging,Li Lin,Zhang Chaoyang,Jiang Tao,Yan Ruiling
        Vol. 5, Issue 3, Pages: 20-23(1987)
        摘要：This paper studied the frequencies of chromosome aberrations in the lymphocytes of workers who had worked in the γ -radiation field at 80-110 µR/hr, for 18-26 years. The results indicated the frequencies of chromosome aberrations of those workers seemed lightly higher than that in control, but had not statistical significance, and furthermore they did not reveal any enhanced repair capacity for chromosome damage caused by another insnlt. In addifion, based on data from M-1 cells the dose-response for centric and acentric aberration may be described by the linearquadratic model.  
        关键词：Occupational Radiation Exposure;Chromosome aberration;Damage Repair   
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        发布时间：2023-04-23
      • Chan Qiming,Guo Ruo,Shen Yu
        Vol. 5, Issue 3, Pages: 24-28(1987)
        摘要：This paper has reported that the alveolous surfactant levels in mice after X-irradiation are shown to be increased durin early time, which is dose dependent between 8-17 Gy. Chinese traditional medicine 764-1 can reduce the increased surfactant levels with no effect on type Ⅱ penumocytes as control. This suggests 764-1 might improve this kind of radiation injury of type Ⅱ penumocytes.  
        关键词：Pulmonary radiation damage;surfactant;type two penumocytes   
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        发布时间：2023-04-23
      • Tang Chengkui,Zhang Yun,Xu Huimin,Xu Jinju,Wang Haijiao,Deng Qu,Xu Peida,Xu Kunny
        Vol. 5, Issue 3, Pages: 29-34(1987)
        摘要：We seperated 30 strains of mould belonging to 7 genera from leaf tobacco of Yunnan province, also studied radiation killing effect for different strains of mould. Results of the tests indicated that after radiation treatment of 9 kGy 60Co-γ rays, cigarettes and tobacco leaves would not suffer from moulds for more than one year at 30℃ temperature and 90% relative humidity and, no significant changes of the main chemical composition of tobacco (the total carbohydrate, total nicotine, total nitrogen, protein, total volatile alkali, ash content) were found.  
        关键词：Mould;Ephestid;elutella Lasioderma serricorne;Cigarette;Radiation   
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        发布时间：2023-04-23
      • Luo Zhengming
        Vol. 5, Issue 3, Pages: 35-41(1987)
        摘要：Using the spherical harmonic approximation to solve electron transport equation, a set of hyperbolic differential equations that governs spherical harmonic moments has been obtained. Correspondingly, a set of initial and boundary conditions has also been given. Utilizing the Lax-Wendroff numerical scheme, the stable numerical solutions which include electron energy deposition in the cavity and its energy deposition coefficients have been obtained.  
        关键词：Electron;Energy deposition;Cavity;Pn Approximation   
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        发布时间：2023-04-23
      • Su Zaozhong,Luo Zuyu
        Vol. 5, Issue 3, Pages: 42-48(1987)
        摘要：DNA strand breaks are the main biological effect of ionizing radiation. Single strand break is induced by a single hit of irradiation and thus has linear dose response curve. Double strand break can be formed not only by a single hit, but also by the overlap of two close single strand breaks located in the complemental strands. The dose response curve of double strand breaks is linear -quadratic. DNA strand breaks can be detected quantatively by various physicochemical methods. Cells are able to repair both single and double strand breaks. The mechanisms of repair, however, are not so clear as those of other repair models, excision repair, for example. The unrepaired strand breaks are lethal. Single strand repair is error-free. The biological effects of repaied double strand kreaks remain unclear thus far. Dose rate has plays important role on the biological effects of ionizing radiations.  
        关键词：Single strand break;Double strand break;Effect of dose rate;Error-free repair;Error-prone repair   
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        发布时间：2023-04-23
      • Wang Haning,Xu Zhili
        Vol. 5, Issue 3, Pages: 49-53(1987)
        摘要：Radiation induced grafting of styrene/divinylbenzene onto radiation crosslinked F 46 films in the gaseous phase was carried out to develop the radiation induced grafting technique and improve the quality of obtained F 46 ion exchange membranes. The radiation crosslinking process was conducted under following conditions: Dose 3×106 rad to 7.5×109 rad; temperature, 200~230℃; and the pressure 4 pa. and 10-3~10-5 pa. Thus obtained crosslinked F 46 films have a tensile strength of 180~240 kg/cm2. After annealing the radiation crosslinked F 46 films were irradiated again with dose about an order of magnitude less than, that for crossinking Results indicated that the crosslinked F 46 films brought about the increase of melting point, and after which a high elastic region was observed. Furthermore, grafting in gaseous phase caused less homopolymer in the system, and the quality of obtained F 46 ion exchange membranes might be improved. At the same time, the consumption of monomer was much decreased.  
        关键词：Radiation crosslinking;Grafting in the gaseous phase;F 46 ion exchange membranes   
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        发布时间：2023-04-23
      • Zhang Wenlong,Zhang Jiashan,Qin Guoliang
        Vol. 5, Issue 3, Pages: 54-57,63(1987)
        摘要：In this paper the mecharism for radiation cleavage of thymine dimer in aqueous solution at room temperature has been studied. The results indicate that thymine dimer splitting by radiation is due to the reactions of hydroxyl radicals and hydrated electrons with the dimer and 0.5 thymine molecule is given for each hydroxyl radical and 1.5 thymine molecules for each reacted hydrated electron their rate constants are 2.3×109 dm3mol-1s-1 and ≃1.0×1010dm3mol-1S-1 respectively.  
        关键词：Thymine dimer;Splitting by radiation;Kinetics of reaction   
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        发布时间：2023-04-23
      • Lin Wanmin,Ma Chengwu,Luo Zuyu,Fan Wenlin,Chen Yixin,Liang Jie
        Vol. 5, Issue 3, Pages: 58-62(1987)
        摘要：Bimolane (AT1727), a new antitumour drug, was synthesized in China. Of late years, attention has been paid to the radiosensitizing activity of AT1727. In present study, this effect has been studied with hypoxic human lung adeno-carcinoma SPC-A-1 using colony formation assay in vitro. The restlt obtained showed that the SER(Sensitivity Enhancement Ratio) was 1.33 when the concentration of AT1727 was 0.15 m mol/L.Basing on the analysis of some results including those of solid tumour of mice, it is reasonable that AT1727 has radiosensitizing effect on hypoxic tumour cells.  
        关键词：Bimolane (AT1727);SPC-A-1 cell line;Cytotoxicity;Hypoxic cell radiosensitizer;SER   
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        发布时间：2023-04-23
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