最新刊期
      期 3 ， 1984
      • Zhang Manwei,Zhang Zhicheng
        Vol. 2, Issue 3, Pages: 1-7(1984)
        摘要：Under examination of the probability of ortho-positronium formation (I3) in some binary systems containing CS2 or C6F6, it is found that the competitive reaction mechanism in spur may be changed as a result of additives. The additive CS2 can increase the relative rate of recombination reaction of active cation-electron in competitive process, and the reaction rate constant of Ps formation in C6F6 is much larger than that in C6H5Cl (by a factor of 60). A "resonant recombination reaction" mechanism possibly occured in the spur is advanced, and a potential relativity schematic drawing deciding whether the resonant recombination reaction can occur or not is proposed. Consequently, an eloquent and direct proof of "resonant recombination reaction" mechanism is given.  
        关键词：Ortho-positronium;Probability of positronium formation;Competitive reactions in the spur;Resonant recombination reaction;Weak electron seavenger   
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        发布时间：2023-04-23
      • Qi Shengchu,Yuan Shaohua,Wu Jilan
        Vol. 2, Issue 3, Pages: 8-13(1984)
        摘要：Under γ irradiation of aqueous solution of cyanide ion the effect of sulphite on the formation of glycine and other main products has been investigated.The experimental results show that the formation of cyanate and formamide arises from OH radical. The yield of glycine increases with the increaseing of the Na2 SO3 concentration, which reveals the fact that the formation of glycine is related to the recombination of H2 CN or HCN- free radicals. The value, ΔG(glycine)≈0.93.The kinetic calculation has been performed. The results not only demonstrate that the following reactions take place in the system saturated with nitrogenbut also show that glycine can be formed by recombination of the diffused H2CN (or HCN-) radicals. The value of has been evaluated. is equal to (8.3± 0.3)×109 M-1S-1.Alanine has been proved to be one of the radiolytic products under γ irradiation of KCN aqueous solution. The yield of alanine is almost independent of the presence of the scavenger, therefore it may be produced in spur.  
        关键词：Radiolysis of KCN aqueous solution;Effect of sulphite;Formation of glycine;Paper chromatography of alanine   
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        发布时间：2023-04-23
      • Liu Renzhong,Ni Minghau,Lin Nianyun
        Vol. 2, Issue 3, Pages: 14-20(1984)
        摘要：Molecular orbital energies for about 30 nitroaromatic and nitroheterocyclic compounds have been calculated by CNDO/2 method, Calculated results of benzene, imidazole, furan and their nitro compounds have demonstrated that the lowest empty orbital energies of nitro substituted compounds are lower than that of their parent compounds, e. g, electron affinities of these nitro compounds are higher than that of the parent compounds. The positive charge is concentrated on nitrogen atom of these nitro compounds. Thus, in these electrophilic nitro compounds, the presence of nitro group is important for forming their electron-adduct.We have calculated 11 substituted nitroimidazoles, 13 substituted nitrobenzenes and 7 substituted nitrofurans. Good linear relationships have been found between the calculated energies of the lowest empty molecular orbits(ELEMO, eV)and one-electron reduction potentials() measured by pulse radiolysis technique. In the case of the substituted nitroimidazoles, a good linear relationship has been obtained between the calculated lowest empty orbital energies(ELEMO, eV) and concentrations of sensitizers C1.6. The calculated results have indicated that the electrophilic sensitizer is a substance with higher EA and IP than that of target molecule, that is to say, both its lowest empty orbital energies and highest occupied orbital energies are lower than that of the target molecule.  
        关键词：nitroaromatic compounds;nitroheterocyclic compounds;MO CNDO/2. calculations;electrophilic sensitizers;Radiation sensitization   
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        发布时间：2023-04-23
      • Tang Zhongxiong,Liu Fu,Zhang Qingxi
        Vol. 2, Issue 3, Pages: 21-24(1984)
        摘要：Dog erythrocyte menbrane specimens were irradiated by 60Co γ-ray at the doses of 1000~4000 rads. The radiation effect and the influence of oxygen on it were studied by means of ANS fluorescence probe. It was revealed that the menbrane associated ANS fluorescence decreased with the increase of radiation doses, and this effect could be enhanced by oxygenation of the suspension medium either before or after irradiation. The possible causes of oxygen enhancement of radiation damage are discussed briefly.  
        关键词：Radiation effect;erythrocyte menbranes;Oxygen effect;Postradiation oxygen effect   
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        发布时间：2023-04-23
      • Meng Xiangshun,Zheng Xiulong
        Vol. 2, Issue 3, Pages: 25-31(1984)
        摘要：In this paper we describe an improved alkaline filter elution-fluorometric method for detection cell DNA radiation damage and its repair. We used screw clamp in place of peristaltic pump to adjust elution rate acquired the same results. The influence of some factors on this method was also studied.Immediately after r-ray irradiation (5~30 Gy) of L7712 cells, it was shown a significant nagative linear relationship between doses and the percentage of DNA remaining on the filter. The repair of damaged DNA could also be measured by our method. This improved method had good reproducibility, sensitivity and could proceed in batch analysis of samples.  
        关键词：Millipore filter alkaline elution;Fluorometric assay;3,5-Diaminobenzoic acid dihydrochloride;L7712 cells;DNA single strand breaks and repair   
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        发布时间：2023-04-23
      • Zhang Lihua,Li Shuhua,Li Shuzhong,He Zhongda,Su Wei,Zhang Zicheng
        Vol. 2, Issue 3, Pages: 32-38(1984)
        摘要：The radiation crosslinking of polyamide 1010 (PA 10l0)were studied. In irradiating PA 1010 at room temperature under vacuum and air with 60Coγ-rays, crosslinking takes place mainly and degradation occurs simultaneously. The radiation obeys Charlesby-Pinner eqation. The dose for incipient gel formation are 25 Mrads and 29 Mrads in vacuum and air respectively. The influence of oxygen is observed. The crosslinking of PA 1010 can be accelerated by MI. Heat treatments of postirradiated PA 1010 cause increasing the gel contents of PA 1010. ESR study indicates the increase of gel content is closely related to the recombination of the radicals trapped in PA 1010. Heat of fusion and crystallization temperature of PA 1010 determined by DSC are changed with radiation dose. The crosslinking of PA 1010 can be characterized by crystallization temperature. Electrical property and thermal resistence of PA 1010 are improved by radiation crosslinking.  
        关键词：Radiation crosslinking;Acceleration crosslinking;Polyamide 1010;Nylon 1010   
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        发布时间：2023-04-23
      • Che Jitai,Yan Meilan,Sun Jiazhen
        Vol. 2, Issue 3, Pages: 39-43(1984)
        摘要：The radiation grafting of styrene or methyl methacrylate onto MgO has been investigated. The graft products were characterized by IR spectrum, X-ray diffraction and pyrolysis gas chromatography. It is shown that MgO-g-MMA graft copolymer and PMMA mixed with MgO have absorption peaks at 1380 cm-1 and 1430~1480 cm-1 in IR spectra respectively. For MgO-g-MMA graft copolymer, the fourth peak is obviously observed in pyrolysis gas chromatography, On the X-diffraction pattern there are another five crystal peaks except the original five crystal peaks of MgO, their spacing of lattice are 4.7702 Å, 2.3618 Å, 1.7926 Å, 1.5703 Å and 1.3084 Å respectively. It is evident that the crystal lattice of MgO affects the regularity of PMMA polymer. It is believed that the radiation product is the graft copolymer onto inorganic compound with chemical bonds rather than the mixture of polymer and inorganic compoumd. The molecular weight of graft copolymer is higher than that of homo-polymer, but the molecular weight distribution is broader in the graft copolymer. The adheson between MgO and polyethylene is enhanced after radiation grafting of Vinyl monomer.  
        关键词：Radiation grafting of MgO;Vinyl monomer;Chemical bond;Graft copolymer;Styrene;Methyl methacrylate   
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        发布时间：2023-04-23
      • Zhow Liangyi,Ma Ruide
        Vol. 2, Issue 3, Pages: 44-49(1984)
        摘要：Using the concepe of life cycle of technology and cost of life cycle to analyse the state of radiation processing at home and abroad, the radiation processing technology abroad is in the stage of growth, while in our country it is just entering the stage of growth.In the mid-80's, we should grasp some items which have ripe technology and high economic effectiveness to put into production and it is vital to engage in basic research of techno-economics, market demand and form a complete set to lay a foundation for more fast development of radiation processing in the end-80's.In the near future, The suitable expanding form is to install some regional radiation processing service center and some multiple center of research and production for radiation processing. The items for expansion and transfer should be strictly selected according to the model.  
        关键词：Radiation processing;Life cycle of technology;Cost of life cycle;Developmental strategy;Project selection   
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        发布时间：2023-04-23
      • Wei Kang,Liu Xueying,Zhu Xuefen
        Vol. 2, Issue 3, Pages: 50-54(1984)
        摘要：The soluble chromatin in mouse thymus after irradiation with differnt doses has been studied in detail. The amount of soluble chromatin increases at 2 hrs after a dose of 800 rads, reaches maximum at 15 hrs, and after 24 hrs goes down gradually. These changes are consistent well with the dying and scavenging process of cells in thymus.At 2, 4 and 6 hrs after irradiation, a linear relationship between the amount of soluble chromatin and the doses has been found within the range of 50~800 rads.The electrophoretic pattern of the polydeoxyribonucleotide(PDN)of soluble chromatin shows typical bands of internucleosome degradation when the irradiation dose reaches a definite level, but further increase of the dose does not cause further degradation of PDN. It seems that the increment of soluble chromatin at higher doses may be related to the higher mortality of cells.  
        关键词：Soluble Chromatin;Polydeoxynucleotides;mouse thymus;dose relationship;DNA electrophoresis   
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        发布时间：2023-04-23
      • Wang Deren
        Vol. 2, Issue 3, Pages: 55-59(1984)
        摘要：The electron beam irradiation produces recombined centers in semiconductor, which may control some parameters of the device. In this paper the irradiation technique, defect character and radiation effect in the devices, irradiation ability and cost were described. Compared with diffused gold, the electron beam irradiation possesses larger productivity, lower cost and controllability of device parameter  
        关键词：Electron beam irratiation;Defect;Device parameter;Irradiation ability;Cost.   
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        发布时间：2023-04-23
      • Li Ying,Wang Nan,Deng Yungzhen,Zhou Deezhong
        Vol. 2, Issue 3, Pages: 60-63(1984)
        摘要：Radiation-Induced graft Copolymerization is one of the important methods in modifaction of the natural polymer materials. This paper reports the radiationinduced graft Copolymerization of n-butyl acrylate onto Chrome-tanned skin by 60Co γ-ray and its filling effect.The produced samples and its residue of acid hydrolysis were measured to determine the content of nitrogen element, the IR spectra and the Ninhydrin colour test. The results indicate that the real graft copolymeriazation of hide collagen with n-butyl acrylate takes place during the radiation.It is shown from our experiment results that the percentage of grafting increases with increasing dose and the concentration of monomer. Good filling effect can also be achived in the radiation-induced graft copolymerization of n-butyl acrylate onto chrome-tanned skin  
        关键词：Radiation processing;Radiatiom-Induced Graft copolymerization;Chrome-tanned skin;n-butyl acrylate;Hide collagen   
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        发布时间：2023-04-23
      • Jiao Xinzhi,Qui Hongbin,Li Lin,Wang Weijun,Ni Jinshan,Xu Zhicheng,Liu Renzhong
        Vol. 2, Issue 3, Pages: 64-68(1984)
        摘要：5~50 Krad γ-irradiation obviously inhibits the sprouting of pototo tubers, a dosage above 10 Krad can protect potato tubers from sprouting for more than 210 days at room temperature.In 2.5 hours after radiating potato tubers the induced release of the ethylene can be detected. The released ethylene enhances with the increase of the dosage and in 7 hours of radiation reaches the maximum value,then reduces, and ceases in 48 hours. The experiment with the precursors of ethylene Met. ACC and the inhibitor AOA proves that the generation of ethylene in potato tubers is done by the Methionine-Path which is activated by γ-ray.1000 ppm ethylene stimulates the respiration and inhibites the sprouting of potato tubers in the way similar to the γ-ray activation. A deduction is made that the ethylene induced by γ-ray is the primary reaction of the γ-ray inhibition on the sproution in potato tubers.  
        关键词：Methionine-Path;Precursor;Radiation;Sprout   
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        发布时间：2023-04-23
      • Vol. 2, Issue 3, Pages: 69-71(1984)
          
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        发布时间：2023-04-23
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