最新刊期
      期 4 ， 1988
      • Zou Shuai
        Vol. 6, Issue 4, Pages: 1-7(1988)
        摘要：This paper is a recent review on biological effects of tritium on mammals, which covers the lethal effect on organisms and cells, tumour induction and malignant transformation of cells, the mean lifespan, changes in haemopoiesis, damage in germ cells, chromosome aberrations and sister chromatid exchanges.  
        关键词：Tritium;Tritiated Water;Biological effect;Relative biological effect   
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        发布时间：2023-04-23
      • Wang Zongyang,Yu Xingying,Liang Yinchun,Song Aibao
        Vol. 6, Issue 4, Pages: 8-11,7(1988)
        摘要：A research of radiation effects on polyvinyl fluoride by means of measuring intrinsic viscosity, analysing infrared spectra and determining its loss of weight was discribed in this paper. A decrease of intrinsic viscosity and molecular weight of polyvinyl fluoride with the increase of irradiation doses was observed.It was found that there were some new absorption peaks occuring in the IR spectra at 1640 cm-1, 1750 cm-1, 1845 cm-1, and 3440 cm-1 when the irradiation doses reached more than 1×104Gy, and intensity of the peaks corresponding to 1750 cm-1 and 1845 cm-1 was decreased by heating treatment and that of the another peak(1640 cm-1) was increased at the same time. The relationship between the intensites of carbonyl and carboxyl peaks and the irradiation doseswas determined.At the beginning the weight of irradiated polyvinyl fluoride increased, then it decreased and at last reached constant level. It was concluded that the loss of weight was related to irradiation doses and temperature.  
        关键词：Polyvinyl fluoride;Radiation effcts;Infrred spectra;Intrinsic viscosity;Loss of weight   
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        发布时间：2023-04-23
      • Lü Yingtao,Zhang Wanxi,Sun Jiazhen
        Vol. 6, Issue 4, Pages: 12-17(1988)
        摘要：In this paper, two different methods were used to prepare the blend of LDPE and EVA. One of them was mechanical blending, and the other was solution blending. The relationship between sol fraction and radiation dose of different weight ratio polymer blends has been studied. The experiment results show that the relationship,is also suitable to this polymer blend system. The method to calculate the β value of polymer blend system (EVA/LDPE) has been established.  
        关键词：Mechanical blending;Solution blending;Low density polyethylene;Copolymer of ethylene-vinylacetate (EVA);Radiation crosslinking   
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        发布时间：2023-04-23
      • He Shaoqin,Sang Hie Kim ph. D,Jae Ho Kim, M. D., ph. D
        Vol. 6, Issue 4, Pages: 18-24(1988)
        摘要：Controversy exists about the validity of hyperfractionated radiation inverse of conventional fractionated radiation from clinical trials. It is necessary to design a real advantage of hyperfractionated radiation, compared with the conventional fractionation schedule of radiation treatment. To investigate the basic radiobiological response of hyperfractionated radiation, the 200µm HeLa S-3 spheroid were used in this study. The quantitative changes in growth rate, surviving fraction and cell kinetics of spheroids after various dose fraction schedules were compared. The data of growth rate and surviving fraction assays showed that repair and redistribution of cells during the radiation periods are important. Cell kinetics study showed a quite constant pattern of G2 + M block in the conventional radiaiton group, but a fluctuated pattern was seen in the hyperfractionated radiation groups. For further mimicking the clinical trail, a larger size of spheroid which have certain hyporic cells was necessary to being used in experiment.  
        关键词：Multicellular Tumor Spheroid;Hyperfractionated Radiation;Cell Kinetics   
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        发布时间：2023-04-23
      • Cheng Longsheng,Li Xiang,Wang Jiazhen,Qin Jingfen
        Vol. 6, Issue 4, Pages: 25-31(1988)
        摘要：When intact red blood cells were irradiated with γ- ray and subsequently incubated for 4 and 6 h at 37℃, an increase in radiation haemolysis was observed with increasing dose. Irradiation, especially at 2×103 Gy, resulted in a 94.1%haemolysis. When 2.5×10-3mol/L PABGA was added to the irradiated samples, haemolysis was inhibited. It indicated that haemolysis was mainly due to the effect of OH. radicals on erythrocyte membrane. The γ-irradiation effect of intact blood cells and erythrocyte membrane was different. γ-irradiation can induce formation of protein cross-linking of erythrocyte membrane, but not the cross-linking of the red blood cell membranes. Formation of lipofuscin after irradiation was observed in the erythrocyte membrane and red blood cells.In the case of erythrocyte membrane there was a greater change in protein SH groups and lipid peroxdiation than in the case of intact red blood cells.  
        关键词：γ-irradiation;Erythrocyte membrane;Haemolysis;Lipofuscin   
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        发布时间：2023-04-23
      • Hu fuming,Peng peili,Cheng jiongming
        Vol. 6, Issue 4, Pages: 32-36(1988)
        摘要：The radiation crosslinking of polybutylene glycol terephthalate(PBT) was studied under various condition. It obeys Charlesby-Pinner equation. The dose for incipient gel formation are 62.5×104Gy and 3.57×104Gy at room temperature and fusion temperature respectively.The structures and properties of croosslinked PBT were studied by DSC and MS methods. The results indicate that PBT is a radiation resistant polymer material, and some of the mechanical properties of PBT may be improved by radiation crosslinking.  
        关键词：Radiation crosslinking;Irradiation in fusion state;Polybutylene glycol terephthalate   
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        发布时间：2023-04-23
      • Gao Yanyong,Zhang zhonglun,Chen Wenxiu
        Vol. 6, Issue 4, Pages: 37-41(1988)
        摘要：The results of the first intercomparison of several dose meters for radiation processing, held in Beijing is good enough. Intercomparison was carried out among five promising dose meter systems. They are D-alanine/ESR, Lactose/ESR, Glutamine/LL, Ceric-cerous sulphyte/SP, and Potassim dichromate/SP. They had been irradiated in two radiation fields. The mean ratio between estimated dose and nominal dose was 1.005 and 1.009, separetely. Overall deviation varied between -0.6% and +3.1%, or +0.6% and +2.4%, separetely. The estimated dose is agreed within 3% with reference dose given by alanine/ESR (GSF), which was provided by International Dose Assurance Service (IDAS). belong to International Atomic Energy Agency (IAEA) programme. This paper has been evaluated the results of the first intercomparison of several dose meters for radiation processing.  
        关键词：Intercomparison;Dose meter;Radiaton processing   
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        发布时间：2023-04-23
      • Lin Weizheng,Tu Tiecheng,Dong Jirong
        Vol. 6, Issue 4, Pages: 42-45(1988)
        摘要：Radiation induced primary radicals from dried pork myosin irradiated at 77 K, and the subsequent radicals appeared in the course of variable temperature elevation from 77 K to 313 K have been studied by ESR. The ESR spectram shows that the primary carbonyl anion radical in the peptide chain (g=2.0037) is the predominant transient product from the myosin irradiated at 77 K and somewhat higher temperature than 77 K. Then at 223 K, the secondary transient species, α-carbon radical on the peptide backon which was characterized by the ESR spectrum of the myosin just appeared via the variable elevation of temperature. Finally, this kind of radical decayed rapidly with elevating from 223 K to 313 K variably.  
        关键词：Myosin;Carbonyl Anion Radical;α-carbon Radical   
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        发布时间：2023-04-23
      • Ye Shuhua,Bi Hekai,Liu Qihua
        Vol. 6, Issue 4, Pages: 46-50(1988)
        摘要：In this paper the effects of Cellular immunity reaction after whole Body irradiation of dogs were examined by counting. T. B cells in peripheral blood and determining function of incorpration of 3H-TdR.1. Effects of Cellular immunity of dogs after 60Co whole body irradiation with lethal dose.The dogs after irradiation were sampled on the 1 st, 3 rd, 6 th, 10 th and 13 th day, respectively, and compared with the dogs without irradiation. The results showed that the number of T. B cells in irradiation group declined rapidly from the 1 st day after irradiation. It was decreased to 38.5% and 28.5%. The incorporation function of 3H-TdR was suppressed seriously. The stimulation index reached to zero value on the 6 th day after irradiation and began to recover from the 10 th day after irradiation.2.The effects of cellular immunity of dogs after treatment with 2 and 350 times the maximum permisible dose of thorium.The results showed that there was no significant difference of cellular immune function between the large dosage group and control group, but the cellular immune function in the small dosage group was three times as large as that in control group. This indicated that the small dosage of irradiation might stimulate the immune proliferation of animals.  
        关键词：Cellular immunity;suppress;stimulation;proliferation   
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        发布时间：2023-04-23
      • Tong Yongpeng,Lin Nianyun,Zhang Jiashan
        Vol. 6, Issue 4, Pages: 51-53(1988)
        摘要：We have studied 2, 4-dihydroxy cinnimic acid and 7-hydroxycoumarin (umbelliferon) radioprotection on dTMP solution in this paper. The results showed that both the protectors exhibited powerful radioprotection, and the former exhibited even more powerful than that of the latter.  
        关键词：2,4-Dihydroxy cinnimic acid;7-Hydroxycoumarin;Radioprotection   
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        发布时间：2023-04-23
      • Sha Renli,Du Andao,Dong Lianfang,Sun Xiufeng,Hou Shufeng,Gao Yueying
        Vol. 6, Issue 4, Pages: 54-58(1988)
        摘要：The colouring of pearl is described. The effects of dose, temperature and quantity of impurity in pearl on radiation-induced colouring were investigated.  
        关键词：Pearl;Radiation-induced colouring;Neutron activation analysis   
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        发布时间：2023-04-23
      • Sun Qun,Guan Bing,Lu Yuelie,Zhang Manwei
        Vol. 6, Issue 4, Pages: 59-61(1988)
        摘要：Under examination of the effect of oxygen on the lifetime (τ3) of ortho-positronium (O-Ps) in perfluorobenzene system, it is found that the effect of oxygen on τ3 in C6F6 is not marked when Po2 is less than 9.3×103 Pa, but the τ3 is decreased markedly as Po2 increases. The experimental results show that the effect of excited molecule 3(C6F6) * on the τ3 of O-Ps is small.The kinetic calculation has been performed. The results demonstrate that the following reactions take place in above system:The values of the original pick-off lifetime() of O-Ps, K(3O2+O-Ps), and K(3(C6F6)* + O-Ps)have been evaluated, 4.15ns, 1.8×1010(1•mol-1•s-1) and 1.7 ×1010 (1.mol-1·s-1), respectively.  
        关键词：Ortho-positronium;Excited molecule;Pick-off quench reaction;Paramagnetic quench reaction   
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        发布时间：2023-04-23
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