最新刊期
      期 4 ， 1985
      • Zhang Wanxi,Sun Jiazhen
        Vol. 3, Issue 4, Pages: 1-10(1985)
        摘要：The kinetic model equations of radiation-induced emulsion polymerization of styrene have been established, according to the nucleation model suggested in above paper. The monomer conversion in stage of region Ⅱ for the polymerization reaction is given as follows:Where A——fraction of micellar nucleation;B——fraction of aqueous nucleation.The curve of monomer conversion against polymerrization time, number of polymer particles and degree of polymerization calculated by these model equations are in agreement with the experimental results.  
        关键词：Styrene;Radiation-induced emulsion polymerization;Kinetics of polymerization reaction   
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        发布时间：2023-04-23
      • Zhou Yiqin,Wu Hancheng,Chang Jixiang
        Vol. 3, Issue 4, Pages: 11-15(1985)
        摘要：Thermally Stimulated Current (TSC) spectra above room temperature from polyethylene terephthalate irradiated by 60Co γ-rays have been investigated. TSC peak values related to the space charge are all through over maximum and finally are reduced to the same current range, independing on the dose rates in the dose range of megarad. There are, probably, two processes during irradiation: one produces new charge carriers, while the other reduces electrons by oxygen diffusion into the polymer specimens.  
        关键词：Thermally Stimulated Curtent;Themo-relaxation of frozen-in dipoles;Space charge;Trapping;Poling;Initial density of charge carriers   
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        发布时间：2023-04-23
      • Zhou Xun,Fang Yunzhong,Xhong Weiqiang
        Vol. 3, Issue 4, Pages: 16-23(1985)
        摘要：On the 3 rd day after the irradiation of 500—2000 rad, the lipid peroxides(LPO) level in liver, brain, heart and bone marrow of mice were elevated with the increase of irradiation dose, but markedly depressed by the intraperitoneal injection of WR-2721 as well. The contents of LPO in liver, brain, kidney, testis and bone marrow in mice were varied with different days following the exposure of 850 rad, but on the same condition, the inhibitory effect exerted by the administration of WR-2721 was progressively increased.  
        关键词：LPO(lipid peroxide);WR-2721[S-2-(3-aminopropylamino) ethylphosphorothioic acid];TBA(Thiobarbituric acid);Mice;tissue   
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        发布时间：2023-04-23
      • Zhou Xun,Fang Yunzhong
        Vol. 3, Issue 4, Pages: 24-28(1985)
        摘要：There was a variety of increasing rates of lipid peroxidation in subcellular fractions of liver and brain in mice on the 1st, 3rd, 5th, 7th and 10th day after the irradiation of 850 rad, as shown in the following sequence microsome>mitochondria>nucleus. The peak values appeared on the 3rd or 5th day. Intraperitoneal injection of WR-2721 gave an inhibitory effect on the LPO formation in subcellular fraction of liver and brain.  
        关键词：Subcellular fraction;Mitochondria;Microsome;Polyunsaturated acid;LPO(lipid peroxide)   
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        发布时间：2023-04-23
      • Ma Yizhen,Yang Guoying,Zhang Luya
        Vol. 3, Issue 4, Pages: 29-34(1985)
        摘要：A Kinetic study has been made on the pre-irradition grafting of aqueous acylic acid onto polypropylene nonwoven.The effects of grafting condition, such as pre-irradiation dose, environment atmosphere, grafting temperature and monomer concentration were investigated.The dependence of the grafting rate on pre-irradiation dose was found to be 0.445 order. It can be concluded that the grafting copolymerization proceeds via a radical mechanism. The apparent activation energy for the grafting polymerization was calculated to be 25.52 kcal/mol.The products obtained from this experiment showed that hydrophilicity, gas penetrability and dying ability were improved. But mechanical strengh of products decreased with pre-irradiation dose over 2×106 rad compared with origonal sample.  
        关键词：Polypropylene nonwoven;Acrylic acid;Pre-irradiation;Graft copolymerization   
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        发布时间：2023-04-23
      • Zhou Xiangyan,Dong Jinchan,Peng Xiaoping
        Vol. 3, Issue 4, Pages: 35-38(1985)
        摘要：It is reported that when the accumulative doses of tritium in testis in 10 days after injection HTO were 0.19~1.01 GY the spermatogonium survival decreased 14~33%, when the accnmulative doses received to 60Co—ray in 10 days were 0.74~2.87 Gy, the spermatogonium survival decreased 13~24%. The preliminary results showed that in both cases a linear dose-effect relationship was observed and estimated RBE value for tritium is 3.31.  
        关键词：Tritiated Water;Spermatogonium;The RBE of tritium   
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        发布时间：2023-04-23
      • Zhang Yangpei,Fan Guocai,Xia Shouxuan
        Vol. 3, Issue 4, Pages: 39-42(1985)
        摘要：It is reported that Irisquinone, an active component from Chinese herb Iris pallasii Fischer, could modify the radiosensitivity of the tumor cells in cancer radiotherapy. By means of alkaline elution method modified in our laboratory, the effect of Irisquinone on γ-ray induced DNA single strand breaks and their rejoining in S-180V cells was studied. The results showed that this compound could inhibit both the processes of normal DNA synthesis and the rejoining of DNA single strand breaks. There was no significant difference between the effects under aerobic and hypoxic conditions.  
        关键词：DNA damage;DNA repair;DNA strand break;radiosensitizer   
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        发布时间：2023-04-23
      • Che Jitai,Yan Meilan,Sun Jiazhen
        Vol. 3, Issue 4, Pages: 43-48(1985)
        摘要：Solution graft polymerization of ethyl acrylate on preirradiated low density polyethylene powder has been studied. It is found that the rate of graft polymerization increased with the increase of radiation dose, dose rate and monomer concentration. The highest rate of graft polymerization is obtained at the temperature range of 25~40℃. Methanol is the most effective solvent for graft polymerization. The structure and physical mechanical properties of graft copolymer depend on the rate of graft.  
        关键词：Radiation graft copolymerization;Preirradiation;Low density polyethylene;Ethylacrylate;Trapped free radical   
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        发布时间：2023-04-23
      • Weng Chenlian,Zhu Younan
        Vol. 3, Issue 4, Pages: 49-52(1985)
        摘要：The Radiosensitization of nitroheterocyclic compounds on nucleic acid constituent is discussed in this paper. In aqueous solution of 5'-GMP (1×10-3M). studies suggest that both nitroheterocyclic compounds N-6 and N-8 are demonstrated as radioseneitizers by raising the release of the inorganic phosphate (Pi) in the absence of oxygen. The degree of radiosensitization find expression in C. E. R. It is defined as the ratio of the yields of inorganic phosphate in the presence and absence of sensitizer, i. e. C. E. R.=G(Pi) sensitized/G(Pi) unsensitized. Studies suggest that the degree of radiosensitization of both compounds N-6 and N-8 decrease with increasing irradiation dose for same sensitizer concentration, and increase with increasing sensitizer concentration for same irradiation dose. The sensitization effect of compound N-8 is superior to compound N-6. The major mechanism of sensitization may be due to the electron transfer from the OH adduct to nitroheterocyclics (N-6 and N-8). The hydrolysis of unstable carbonium ion (GMP-OH) lead to the release of Pi.  
        关键词：Radiosensitization;Guanosine-5'-mono-phosphate (5'-GMP);Nitroheterocyclic compound;Chemical enhancement ratio   
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        发布时间：2023-04-23
      • Shen Guowei,Xu Meiyu,Chen Duisong,Fang Ruyi,Ma Xinsheng,Bao Fugen
        Vol. 3, Issue 4, Pages: 53-56(1985)
        摘要：The electron beam form electron accelerator is used to irradiate the germinated seeds of wheat. The results show that the high dose of irradiation could check the seedling growth of wheat in M1 generation and as the dose increase the effect is more remarkable, when the dose is increased to more than 1600 rads, the rate of seedling survival decreases obviously. Besides all these, the effects could induce mutation in M2 generation of wheat.  
        关键词：Electron beam radiation;Germinated seeds of wheat;Induced mutation   
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        发布时间：2023-04-23
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