最新刊期
      期 2 ， 1987
      • Zhong Xiaoguang,Sun Jiazhen
        Vol. 5, Issue 2, Pages: 1-7(1987)
        摘要：This paper described the basic principle of pulsed NMR and its application in the radiation chemistry of polymer. To take polydimethylsiloxane and polyisobutylene as examples, we illustrated how to use this method to study the behaviour of radiation induced crosslinking and fracture of polymer. Moreover, the condition of application of this method to polyethylene, poly (ethylene oxide) and other systems has been briefly described.  
        关键词：Pulsed NMR;Polydimethysiloxane;Polyisobutylene;Radiation induced crosslinking;Fracture;Spin-spin relaxation   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36363211 false
        发布时间：2023-04-23
      • Guo Furong,Zhou Shunyuan,Zhou Xiangyan,Dong Jinchan
        Vol. 5, Issue 2, Pages: 8-12(1987)
        摘要：The tritiation results in body fluid of mice after HTO-toxication by intraperitionally single injection, continuous intake of drink and their combining pattern are studied comparitively. In the combining pattern, if HTO concentration in drink water is selected properly, either the 3H-concentration in body fluid or the dose rate of 3H-irradiation keeps constant in a required level, and Accumulative process of 3H in body fluid is shown in continuous intake of drink.  
        关键词：Tritium;internal exPosure;mouse metabolism.   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36363212 false
        发布时间：2023-04-23
      • Lin Wanmin,Wang Zaolin,Ma Chengwu,Luo Zuyu
        Vol. 5, Issue 2, Pages: 13-18(1987)
        摘要：It is essential in radiobiology to fit a survival-radiation dose curve from experimental data, which was usually done on a computer by the least square method. However, using different objective functions, the curve parameters from the same data may be different. The statistics inference in this paper shows that the objective function is more suitable for survival curve fitting than those used by previous authors.Three Survival models are used to verify the theoretical inference and a good fitting is achieved. Moreover, this objective function will be applicable to other kinds of fitting work for treating experimental data ranging over several orders.  
        关键词：Survival-radiation dose curve;Curve fitting;Least squares method;Objective function   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36363214 false
        发布时间：2023-04-23
      • Yang Jiakuan,Cheng Wenying,Ding Zhisheng,Cai Rongmei,Xu Ping,Luo Weihua,Zhu Bingchai,Zhang Hongyuan,Jia Fuxing,Lu Jiaben
        Vol. 5, Issue 2, Pages: 19-22(1987)
        摘要：In this paper, the change of lymphocytes micronuclear frequency in rabbits IN VIVO and IN VITRO irradiated by 100, 200, 300 and 400 rads is reported. The results indicate that micronuclear frequency was increased with the dose of radiation in both conditions mentioned above, but there was no marked difference. Again, these results show that the lymphocytes micronuclear frequency used as a biodosimeter was completely possible.The lymphocytes micronulear frequency increased immediately 2 hours later after radiation and the frequency increase maintained for 2 weeks, starting from 4 th week the micronuclear frequency was reduced. All these results were discussed.  
        关键词：Micronuclei;Radiafion Biological dosimeter;Radiation effect   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36363242 false
        发布时间：2023-04-23
      • Su Liaoyuan,Geng Yongzhi,Liu Fenju,Li Jianhua,Liu Li
        Vol. 5, Issue 2, Pages: 23-27(1987)
        摘要：Human whole blood were incubated in vitro. Lymphocytes were induced by mitogen PWM and LPS respectively. After exposure to 60Coγ-rays at various doses, the cells were incubated together in different combination. Lymphocyte induced by one kind of mitogen was incubated as control. The rate of lymphocyte proliferation and transformation was determinated by 3H-TdR incorporation. This study demonstrated that PWM-induced lymphocyte was able to enhance the stimulating effect of LPS on B lymphocyte. Lymphocytes induced by one kind of mitogen were exposed to 1-40 Gy r-rays, and the cells were incubated alone or with the lymphocyte induced by another mitogen, thus, the 3H-TdR incorporation became much lower than that in control. The result showed that the decrease in incorporation of 3H-TdR was dose dependent and it had a negative correlation. The relationship between the logarithm of radiation dosage and the radioactivity counts for 3H-TdR incorporation was expressed by the linear regression equations. By T-test, it was shown that PWM-induced lymphocyte was damaged more markedly than LPS-induced lymphocyte by irradiation. The stimulating effect of the PWM-induced lymphocyte disappeared after 1 Gy irradiation, but the LPS-induced lymphocyte after 1-2 Gy irradiation was still stimulated by the PWM lymphocyte. It demonstrated ionizing radiation caused defect of immunity in organism, the damage of the PWM-induced T helper lymphocyte was more important in maintaining the function of immunity.  
        关键词：PWM-induced lymphocyte;LPS-induced lymphocyte;3H-TdR incorporation;Radiosensitivity   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36363216 false
        发布时间：2023-04-23
      • Ba Weizhen,Zhang Mingjian,Zhou Guangwen
        Vol. 5, Issue 2, Pages: 28-35(1987)
        摘要：The energy dissipation distribution of electron beams with the energy from 0.5 to 8 MeV in Silicon has been calculated theoretically by the moment method The distributions of corresponding bremsstrahlung energy losses have also been calculated approximately. The depth distributions of absorbed dose in Silicon have been obtained.  
        关键词：Electron beams;0.5 to 8 MeV;Transport equation;Moment method;Energy dissipation distribution;Depth dose distribution   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36363257 false
        发布时间：2023-04-23
      • Zhang Wanxi,Zhang Yuefang,Sun Jiazhen,Chen Chunzheng,Sun Ying
        Vol. 5, Issue 2, Pages: 36-38(1987)
        摘要：In this paper, radiation-induced crosslinking mechanism of F-40(copolymer of tetrafluoroethylene and ethylene) and characterization of the crosslinking density by X-ray photoelectron spectroscopy (XPS) have been first studied. The dose of gelation of F-40 calculated with a plot of F/C(ratio of fluorine to carbon) obtained from XPS against R(radiation dose) is 4.1 Mrad. It is found that the crosslinking density is the largest at a range of certain dose and it becomes smaller at other doses. The radiation dose to reach the maximum crosslinking density is approximately 12.1 Mrad.  
        关键词：Radiation crosslinking;XPS;The dose of gelation;F-40   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36363305 false
        发布时间：2023-04-23
      • Tang Chengkui,Zhang Yun,Xiong Youliang,Liu Aihua,Huo Weishun,Xu Huimin,Li Xueming
        Vol. 5, Issue 2, Pages: 39-42(1987)
        摘要：The paper described the influence of radiation processing on tobacco biological toxicity. We used the cigarette smoke condensate in Ames test, human embryo cells(KMB-17) genetics toxicity test and mice reproduction ability test. All the results showed that 10 kGy 60Co-γ rays radiation processing of tobacco did not increase the biological toxicity of tobacco.  
        关键词：Radiated cigarettes;Biological toxicity;Cigarette tar   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36363302 false
        发布时间：2023-04-23
      • Zhang Jixiang,Shi Chenyang,Liu Longji,Yang Jengtsong,Guo Renrong,Jiang Shuyun,Zhang Xinren
        Vol. 5, Issue 2, Pages: 43-48(1987)
        摘要：Fuliji Roast Chicken is a kind of special product of Anhui, China. But the chickens can not remain fresh for more than 2 or 3 days even in the winter. To solve the problem, the γ-ray irradiation preservation method has been developed.Fresh chickens were packaged in vacuum with PP/PE or PET/PE plastic film and then irradiated with appropriate dose. TVB-N, amino-acid contents and the amount of bacteria were analyzed for the irradiated and nonirradiated chicken. In order to gain further knowledge of the radiation effects on protein, peptide and amino-acids, the model systems using Serium Albumin Bovine and complex amino-acids were set up. The effects of γ-radiation on the two systems under various circurmustances have been observed and discussed.A vast amout of data has proved that the irradiation method for preservation has fulfilled the norms expected. The irradiated chickens are safe and hygienic.  
        关键词：γ Irradiation pceservation;Protein;Amino-acids;Fuliji roast chicken   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36363323 false
        发布时间：2023-04-23
      • Zhu Xinfang,Li Busen
        Vol. 5, Issue 2, Pages: 49-52(1987)
        摘要：A quantitative IR method for determining the composition of PTFE-ST graft copolymer having chromatographic separation function in micro-particle state has been described. The method was quantified by using the graft copolymer film as an external standard. The absorbances of bands at 1493 cm-1 and 2362 cm-1 of standard samples were measured and the regression equation of A1493/A2362 vs graft (%) was set up This method has shown its own advantages for accurate and convenient determination of monomer content in the PTFE-ST radiation graft copolymer  
        关键词：Polytetrafluoroethylene;Styrene;Graft copolymer;Quantitative method by infrared spectroscopy;Infrared spectroscopy   
        3
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36363322 false
        发布时间：2023-04-23
      • Hu Tianxi,Qian Ying,Xia Jiazhi
        Vol. 5, Issue 2, Pages: 53-57(1987)
        摘要：The change of cell membrane charge was induced by soft X-ray. This change was seen not only on the erythrocytes, but also on the lymphocytes and platelets. It was revealed by the drop of EPM (electrophoretic mobility). Within the low dose range, this change of the charge was temporary. At 4 hrs after irradiation, the EPM dropped to its miniumm; 24 hrs later, it returned to its original level. The extent of EPM depended on irradiation dosage.The lymphocytes are a group of complicate cells According to the cell EPM, they could be divided into two subgroups: T cell and B cell. The EPM of normal T cells was faster than that of B cells. After T and B lymphocytes were irradiated by soft X-ray, the EPM of both subgroups became slower, the peak of frequency distribution lowered down and the peak width extended. The platelets are homogeneous particle population and their EPMs appeared to be identical.When the concentrated samples of platelets after irradiation were suspended in unirradiated plasma, the drop of EPM was much faster than that of the unirradiated platelets suspended in the irradiated plasma. When the irradiated platelets were suspended in phosphate buffer, their EPM were much lower than that of the same platelets suspended in their own plasma. If the platelets were suspended in their own plasma and then irradiated with doses up to 2000 rads, their EPM drop could recover after irradiation; but the recovery was not seen in cases of irradiating the platelets suspended in phosphate buffer. Based on the above results, it can be considered that there are some factors in the plasma which protected the platelets from radiation damages and promoted the damaged platelets to recover, and besides, the drop of EPM can be prevented by SOD (superoxide dismutase) .  
        关键词：Soft x-ray;lymphocytes and platelets;cell membrane charge;electrophoretic mobility (EPM);Superoxide dismutase   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36363333 false
        发布时间：2023-04-23
      • Xu Honglin,Li Pingyu,Deng Longan,Liu Yinchun,Lin Housong,Huang Tingjun
        Vol. 5, Issue 2, Pages: 58-61(1987)
        摘要：Having been irradiated, the pinus got a deeper colour, with more beautiful chord plane, less moisture and more organic solvent. It was very easy to take the fat out of the pinus. However, no obvious changes could be found in its structure, fibre form and compression strength parallel to grain. This will bring us a new way for modification and utilization of the pinus.  
        关键词：Pinus massoniana;Radiation improving;Compression strength parallel to grain   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36363350 false
        发布时间：2023-04-23
      • Yan Wenyu,Xu Xun,Jing Weiqau,Yang Jiakuan,Xu Zicheng,Liu Renzhong
        Vol. 5, Issue 2, Pages: 62-63(1987)
        摘要：In our country, there had been accomplished many single types of animal experimentation or human dietary observation of irradiated food. All these tests we proved to be safe.If the irradiated food are commercialized, we will eat a variety of irradiated food, will they be safe too? For this purpose, we have done the animal experimentation with multiple kinds of irradited food. The food was irradiated with the dosage double the dose normally required for food preservation of 0.1-8.0 kGy. The irradiated food in the feed we prepared occupied 80% of dry weight. The feeding study lasted for 150 days. The indices including nutritional composition of food and its utilization, rate of growth and development blood examination, mutagenic test and pathological examination showed no significant difference between the experimental group and its references.This result gave us enough evidence for the further human dietary observation of multiple irradiated food or commercialization of irradiated food.  
          
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36363351 false
        发布时间：2023-04-23
      0