最新刊期
      期 2 ， 1993
      • Zhang Xingyuan,Zhou Yiqin
        Vol. 11, Issue 2, Pages: 65-69(1993)
        摘要：γ-irradiation of a large dose (0.5—4 MGy) leads to the breaking of macromolecular chain and the rising of group density of phenyl with oxygen in(polyethylene terephthalate) (PET) films. The detrapping current of trapped charge carriers and the depth of trapping level of irradiated PET electrets increase with increasing irradiation dose. Due to the change of molecular structure, the kinds of structural defect rise resulting in increase of the number of discrete trapping levels(from two of amorphous to four of R-5).  
        关键词：γ-irradiation;Polyethylene terephthalate;Detrapping current;Discrete trapping level   
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        发布时间：2023-04-23
      • Ha Hongfei,Chen Yiqing
        Vol. 11, Issue 2, Pages: 70-74(1993)
        摘要：In this work, the post-deactivation of irradiated catalase in dilute aqueous solution was found and investigated. Post-deactivation of irradiated catalase means that the catalase in dilute aqueous solution could not only be deactivated during γ-irradiation, but it has also been deactivated continously for some time after the irradiated samples were taken out of the radiation field. No reports about this phenmenon in literatures were searched up to now. The effects of absorbed dose,initial catalase concentration in solutions, atmosphere, temperature and additive on post-deactivation of catalase were investigated. H2O2 produced by water radiolysis may attend the post-deactivation reaction in some way. Oxygen in ensyme samples is necessitous for the post-deactivation. 1×10-4 to 5×10-3 mol/L of CH3CH2OH, HCOONa and EDTA could control the post-deactivation efficiently.  
        关键词：Catalase;Alcohol;HCOONa;EDTA;Radiation induced post-deactivation   
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        发布时间：2023-04-23
      • Wang Deheng,Tian Wuxun,Zhang Hongyuan,Wen Quanfa,Hu Yuexin,Zhao Shanyin
        Vol. 11, Issue 2, Pages: 75-79(1993)
        摘要：After gastric intubation, the whole body 59Fe-retentions in rats were fit to two compartment exponential equations. The biological half lifes for 59Fe in the slow compartment are 95 and 109 days for young and adult rats respectively, not statistically significantly different. The main 59Fe-acculative organs are liver and bone marrow. The biological eliminations of 59Fe from most organs in young rats are faster than in adult rats. The young rats get more total accumulative dose in organs except liver and total body and have a faster dose accumulative speed than the adult rats. Equal quantities of 59Fe P. O. may probably give young rats more intensive biological effects than adult rats.  
        关键词：59Fe;Retention;Distribution;Internal dose;Rat   
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        发布时间：2023-04-23
      • Long Fu,Tang Liming,Zhao Jin,Gao Zhenyong
        Vol. 11, Issue 2, Pages: 80-83(1993)
        摘要：Grafting of water soluble mixed monomers of acrylic acid (AA) /acryamide (Am) and acrylic acid/methacrylic acid (MA) onto polyethylene film by the pre-irradiation grafting method was investigated. The results showed that the grafting proceeded successfully with the adding of ferric salt in the solution. In the case of AA/Am system, a synergistic effect was noticed. In the case of AA/MA system, the graft percent increased with the increase in the concentration of MA in the feed ratio. Furthermore, the effects of monomer concentration, radiation dose and temperature on the grafting were also studied.  
        关键词：Polyethylene;Pre-irradiation;Radiation grafting;Acrylic acid,Acryamide;Methacrylic acid   
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        发布时间：2023-04-23
      • Yang Weizhi,Shen Yu,Li Zheng,Wang Jinghong
        Vol. 11, Issue 2, Pages: 84-86(1993)
        摘要：The damage of pulmonary capillaries is closely related with the formation of pulmonary radiation fibrosis. The effect of drug 764-3 on capillary radiation damage by measuing capiliarial forming rate (CFR) was studied. The lung tissue cubes of mouse were radiated in vitro by graded doses of 8 Mev X-ray, ranging from 10—25 Gy. After irradiation the tissue cubes were incubated in 37℃5 % CO2 incubator, with or without drug. Cultured medium with 5 mmlo/L drug 764-3 was used for of each dose point to the treated group. Six days later, the CFR was measured. The CFR decreased with the increase of radiation dose, while in the group treated with radiation and drug CFR was higher than radiation alone. It suggested that drug 764-3 showeda protective effect on the pulmonary capillaries against radiation.  
        关键词：Pulmonary capillary;Radiation protection;Fibrosis;Chinese drugs for activating blood circulation and removing stasis   
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        发布时间：2023-04-23
      • Lin Xiao,Chen Jie,Xu Jiping
        Vol. 11, Issue 2, Pages: 87-89,86(1993)
        摘要：Plasma Polymerization of three organosilicon compounds, hexamethyldisiloxane (M2), hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane(D1), were carried out in a capacitively coupled tuber reactor with external electrodes. Polymers were deposited on the porous polypropylene substrase. Gas permeability of these composite membranes were studied. These composite membranes showed high oxygen permeabitity of 3.7—15×10-9 cm3 (STP)/cm2•s• Pa. The composite membrane prepared from M2 showed the highest oxygen/nitrogen separation factor of 3.1. The deposited films were investigated by IR, XPS and SEM.  
        关键词：Organosilicon;Plasma polymerization;Composite membrane;Gas permeability   
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        发布时间：2023-04-23
      • Wei Zengquan,Liu Yuyan,Wang Guiling,Ma Shouwu,Yang Hanmin,Gao Qingxiang,Han Rong,Wang Yafu
        Vol. 11, Issue 2, Pages: 90-94(1993)
        摘要：According to LSS theory the depth of low energy heavy ions implanting into wheat seeds was calculated in the paper. On the other hand, the depth was also measured and analysed by RBS method. Both of the results were consistent with each other. The average range was about 115 nm. Possible effect ranges induced by thermal spike effect of the ions, subexcitation electron amplitude and thermalization tail of the secondry electrons were discussed in view of nuclear physics and radiation chemistry were respectively valued.  
        关键词：Heavy ion with low energy;Wheat;LSS theory;Rutherford back scattering;Thermal spike effect;Subexcitation electron;Thermalization tail   
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        发布时间：2023-04-23
      • Lü Huimin,Zhou Xiangyan,Li Li,Zhang Zhixing
        Vol. 11, Issue 2, Pages: 95-98(1993)
        摘要：Tritium water with three kind of different dose was single injected intraperitoneally to pregnant mice in the various time. The tritium concentration in the tissues from mother mice were measured on the 3.5 days after mother mice parturition. Dose rates in baby mice were estimated, as well as the transfer coefficient of tritium from mother mice to baby mice calculated based on the tritium concentrations. The results of the experiment showed that tritium was almost uniformly distributed among the tissues after exposure to tritiated water at three experimental groups. However, it was found that relative concentrations of tritium in the baby mice tissues were consistently higher than that in mother mice tissues for three experimental groups. The relative concentration of tritium in the tissues was not affected by the different dose but developing on the exposure time. The results of radiation dose rates from baby mice estimation at the end of exposure showed that the higher radiation dose rates was found in the mice exposed to tritiated water during 7.5 days.The transfer coefficient of tritium from mother mice into baby mice was almost no different among the three radiation dose groups. The highest transfer coefficient was observed in mother mice exposed to tritiated water during 16.5 days, however it was not found that transfer coefficient were higher in the mother mice exposed to tritiated water during 11.5 days than that of 7.5 days.  
        关键词：Tritiated Water;Metabolism;Transfer coefficients;Pregnant mice;Radionuclide migration   
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        发布时间：2023-04-23
      • Li Shuzhong,Zhang Wanxi,He Zhongda,Xu Jun
        Vol. 11, Issue 2, Pages: 99-103(1993)
        摘要：In this paper, the dielectric behavior of γ-irradiated polyether ketone with cardo group (PKK-C) was studied. It was found that the obvious change of dielectric behavior exists after irradiated at the certain dose (2.02 MGy). The temperature spectra of dielectric loss factor ε" within the range of 20—200℃ and the frequency spectra of dielectric coefficient ε′ in the range of 30 Hz—1 MHz have shown that ε′ increases from 3 to 5 and ε" increases from 5.4×10-3 to 4.6×10-1 for the irradiated PEK-C.  
        关键词：Polyether ketone (PEK-C);γ-irradiation;Irradiation dose;Dieleetric behavior;Temperature spectra;Frequency spectra   
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        发布时间：2023-04-23
      • Jiang Jiagui,Sun Guoqi
        Vol. 11, Issue 2, Pages: 104-106(1993)
        摘要：It was found that the content of lipoperoxide (LPO) for the adolescent mice exposed to fractionated γ-irradiation at a dose of 1 Gy into 25 sub-dosesduring irradiation was much higher than that for the mice at an age of 5 weeks exposed to 1 Gy without fractionation. This demonstrates that radiation sensitivityfor adolescent mice is higher than that for adult mice. It also demonstrates that there is a correlation between the variation in content of LPO and the activity of SOD.  
        关键词：Lipoperoxide;Superoxide dismutase;Radiosensitivity;Fractionated irradiation   
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        发布时间：2023-04-23
      • Zhang Hongyuan,Wang Lanjin,Fan Zhengping,Cai Ping,Wen Quanfa,Zhang Guibo
        Vol. 11, Issue 2, Pages: 107-112(1993)
        摘要：The paper reports on the changes of combined cytogenectic effects induced by low dose γ rays irradiation and benzene in rabbit lymphocytes and bone marrow cells. The results were summariyed as fotlows: benzene and γ-rays can induce chromosome aberration and SCE in rabbits. The main aberrant type was chromosome type acentric fragment. Chromosome aberrations in blood lymphocytes were higher than in bone marrow cells. As changes of dose, chromosome aberrations by γ-rays were significatly higher than SCE, but linear relationships of dose and effect were not significantly, contradictorily, SCE induced by benzene were more obvious than chromosome aberrations, moreover, linear dose effect relationships of acentric aberration rate and SCE frequency of lymphocytes were observed. The aberration yield induced by γ-rays can significantly be enhanced by treatment benzene. The combined cytogenetic effect of benzene with radiation could be synergetic mainly in dicentrics plus ring, bing mainly additive in acentrics.  
        关键词：Chromosome aberration;SCE;Low dose γ-rays irradiation;Benzene;combined effect;Rabbit   
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        发布时间：2023-04-23
      • He Junqi,Wang Xiaoli,Wang Zhongwun,Zhao Suse,Liu Hechen,Sun Shiquan
        Vol. 11, Issue 2, Pages: 113-117(1993)
        摘要：The results of chemical analysis and scanning electron microscopic observation show that large dose of 60Co gamma radiation decreases substantially the chemical and biological stability of porcie dermal collagen after hydrolysis with hot alkali and collagenase, But pretreatment with 0.01%—0.1% glutaraldehyde is beneficial for the improvement of its stablity; radiation in the wet state is better than in dry.  
        关键词：Porcine dermal;Glutaraldehyde;Cosslinking;Collagen;Radition   
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        发布时间：2023-04-23
      • Niu Huisheng,Zhang Gueixiang,Ye Wenzhong,Zhang Boling
        Vol. 11, Issue 2, Pages: 118-120(1993)
        摘要：This paper reports the changes on activity of amylase and content of deoxycytidine in serum of 615 mice after 137Cs γ-radiation.The results show that activities of amylase in all of radiation groups at 2 h after radiation are remarkable lower than that in normal group (p<0.001); but in groups of 15 Gy and 30 Gy dosage continue high; in groups of 5 Gy and 7.5 Gy dosage at 1 d after radiation recover normal level and then reduce. Content of deoxycytidine, in groups of 5 Gy and 7.5 Gy dosage at 2 h after radiation is rather higher than normal value and is lower at ninth day; in groups of 15 Gy and 30 Gy dosage is lower than normal level and then is higher continuously.  
        关键词：γ-radiation;Amylase;Deoxycytidine   
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        发布时间：2023-04-23
      • Sun Shiquan,Liu Hechen,Shi Zhancheng,Liu Shengen,Meng Xianyu,Zhao Suse,Wang Chenling,You Zhanyun,Xiong Jinlian,He Junqi
        Vol. 11, Issue 2, Pages: 121-125(1993)
        摘要：Radiation sterilization will induce degradation of col lagen and proteoglycans in the skin and bone grafts. Dose choice of radiation steril ization is decided by the balace of the reliable sterilization to the microorganisms the and tolerable destruction to the graft. The present research supports that 15 kGy is optimal dose to fulfill both the above requirements, provided that skin and bone grafts are prepared under sterile working condition with feasible caution to diminish the initial bioburden as far as possible. Glutaraldehyde pretreatment of skin and bone grafts was proposed for overcoming radiation induced degradation of dermal collagen and bone matrix and it is hopeful for restraining the exaggerated resorption of radiation sterilized AAA bones.  
        关键词：Radiation sterillization;Bone transplantation;Collagen;Skin;Glutaraldehyde;Biological radiation effect   
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        发布时间：2023-04-23
      • Li Quanfen,Wang Jiaxu
        Vol. 11, Issue 2, Pages: 126-128(1993)
        摘要：This paper describes the different electron irradiation effects in different structures of diodes and the different results produced by different irradiation ways. From this work, we can know how to choose proper manufacture arts and comprehensive factors according to the structures of diodes and the irradiation conditions.  
        关键词：Reverse Recovery time;Radiation damage coefficient;Forward voltage drop;Maximu reverse operating voltage   
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        发布时间：2023-04-23
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