最新刊期
      期 4 ， 1993
      • Fang Ruoying,Cheng Jiwu,Hu Tianxi,Tu Tiechen,Dong Jirong,Wang Wenfeng,Lin Nianyun
        Vol. 11, Issue 4, Pages: 193-197(1993)
        摘要：The abilities of scavenging active oxygen species, and OH·, by tea polyphenols and quercetin have been studied by chemiluminescene, ESR and pulse radiolysis. Tea polyphenols and quercetin are all phenolic antioxidants. The synergetic studies show that both tea polyphenols and quercetin are strong free radical scavengers. Tea polyphenols are better than quercetin. The results from CL studies are in good accord with those from ESR and PR studies.  
        关键词：Tea polyphenols;Quercetin;Free radical scavenger;Chemiluminescene(CL);Electron spin resonance(ESR);Pulse radiolysis(PR)   
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        发布时间：2023-04-23
      • Zhong Xiaoguang,Yu Li,Zhao Wenwei,Zhang Yuefang,Sun Jiazhen
        Vol. 11, Issue 4, Pages: 198-202(1993)
        摘要：In this work by using XPS, infrared spectrometer, the measurement of gel content and radiation induced weight loss, the radiation effects and its temperature dependence of polyvinylidene fluoride (PVDF) were studied. The obtained results show that in low dose range the increase in radiation temperature favors radiation crosslinking reaction of the polymer. Under high temperature, the unsaturated structure in PVDF are mainly formed through the further dehygrofluorination of crosslinking and/or branching structures, whereas under the low temperature the dehygrofluorination of fluoro-carbon radicals to form more stable polyene radicals is responsible for the observed CF structure in C-ls spectra and double bonds shown in IR spectra.  
        关键词：Polyvinylidene fluoride;XPS;Radiation crosslinking;Weight loss;Temperature effect   
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        发布时间：2023-04-23
      • Che Jitai,Yan Meilan,Sun Wenxia,Zhang Wanxi
        Vol. 11, Issue 4, Pages: 203-206(1993)
        摘要：The preparation and characterization of functional polymeric active materials for ion selective electrodes by radiation graft of acrylic acid onto polystyrene were studied. The SO4- ion selective electrode using functional polymer materials containing SO4- active group obtained from radiation graft copolymerization as active materials were prepared. Its functional curve is linear in 10-1—10-3 mol/L in Na2SO4 solution with the slope 52 mV/. The response time is <70 s. The chloride electrode was made with functional polymer as active materials. This electrode exhibited Nernstion response in 10-1—2×10-4mol/L Cl- solution with 8× 10-5 mol/L minimum measurement concentration. Its response time is<5 s, whose resistance is <60 kΩ. The properties of the rare earth ion selective electrodes prepared by these polymeric active materials were reported. It has better linear relationship between E and PC, better stability, faster response and selectivity than that of ones obtained by chemical method and irradiation method.  
        关键词：Radiation graft copolymerization;Functional polymer;Ion selective electrode;Chloride selective electrode; selective electrode;Rare earth ion selective electrode   
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        发布时间：2023-04-23
      • Yu Shui,Chen Wenxiu
        Vol. 11, Issue 4, Pages: 207-212(1993)
        摘要：The relation of density of polypropylene without and with various additive(carbon black, titanium dioxide, phthalocyanine blue and helindon orange)versus its isothermal crystallization temperature, annealing period and irradiation was examined in this paper. The change of density was affected by the crystalline degree and the spherulite diameter of polypropylene samples.The increasing value of irradiated polypropylene density depended on its crystallization temperature and annealing period, which increased up to a maximum value for each given crystallization temperature, due to the crystallization of smaller molecules, which were formed by radiation chian scission. The densities were change very less after irradiation without annealing.  
        关键词：Polypropylene;Density;Annealing;Additives;Morphology   
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        发布时间：2023-04-23
      • Chen Lishu,Ma Xingmin
        Vol. 11, Issue 4, Pages: 213-216(1993)
        摘要：There are several factors affecting the response of radiochromic dye dosimeters to ionizing radiation. Some of them are avoidable or controllable, but can not be corrected in practice such as effect of light. Others are not avoidable or controllable, but can be corrected, such as effect of temperature. Spectral characteristics of incandescent light, daylight, UV-light and sunlight have been determined in this paper. This is helpful for the explanation of the effect. The changes in illumination of different light sources with distances are shown. The relationships between the change in optical density per unit thickness and time of exposure to incandescent light, daylight, UV-light, and sunlight have been measured. It comes to a conclusion that radiochromic dye dosimeters are not so sensitive as photoplate film to visible and incandescent light but the background and post-irradiation optical densities will be rapidly increased when they are exposed to daylight, sunlight, or UV-light for a while. Therefore, they should be kept or stored in dark places.  
        关键词：Radiation dosimetry;Solid-state dosimeter;Radiochromic dye dosimeter   
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        发布时间：2023-04-23
      • Zhu Yan,Qi Shengchu
        Vol. 11, Issue 4, Pages: 217-221(1993)
        摘要：In this paper, the effect of the concentrate of liquor made from dried sweet potato on the proliferation of tetrahymena pyriformis has been studied.The toxicity of d-2,3-butanediol and ethanol have also been investigated by the tetrahymena pyriformis and it has been found that they didn′t produce the effect on the propagation of the cell up to 250 and 1000 ppm, separately. The unirradiated concentrate of the different batch liquors all appear more or less the inhibition on the proliferation of tetrahymena pyriformis. The effect is more remarkable for the concentrate of the irradiated liquors and is strengthened as increase of absorbed dose. It shows that the toxicity of the concentrate of the irradiated liquor to tetrahymena pyriformis may be related to the quality of the dried sweet potato used and the formation of radiolytic products with higher boiling point.  
        关键词：Tetrahymena pyriformis;d-2;3-Butanediol;Ethanol;Irradiation;Concentrate of liquor   
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        发布时间：2023-04-23
      • Shen Mei,Wang Cailian,Xu Gang,Zhao Kongnan,Chen Qiufang
        Vol. 11, Issue 4, Pages: 222-226(1993)
        摘要：After seed radiated by γ-rays, diagrams of peroxidase isozymes in barley seedlings were changed, and chromosomal aberration in root tip cell were produced. The dose-effects on peroxidase isozymes number and cell rate with chromosomal aberration were fitted by linear regression equations Y=Ax+B. The results showed that the radiosensitivity of naked barley was higher than that of hulled barley, and two row-lower than four- and six- row.  
        关键词：γ-rays;Barley;Gel electrophoresis;Peroxidase isozymes;Chromosomal aberration   
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        发布时间：2023-04-23
      • Du Zeji,Sun Guoqi,Su Liaoyuan
        Vol. 11, Issue 4, Pages: 227-230(1993)
        摘要：The fluorospectrophotometric measurement was used to determine changes of malondialdehyde (MDA) level in mice tissues and serum after irradiation, and to assess the protective effect of Vitamin E on damage induced by free radicals. The results indicated: 1. The highest MDA level took place at 24 h after 3.0 Gy irradiation; 2. MDA level in tissues and serum was better elevated with the increase of irradiation dose; 3. Vit E had a effect on reducing MDA level, the most suitable dose of Vit E is 250 µg/g body weight of mice.  
        关键词：Irradiation;tissue;Malondialdehyde;Vitamin E   
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        发布时间：2023-04-23
      • Yi Min,Zhong Qun,Chen Yiqing,Ha Hongfei
        Vol. 11, Issue 4, Pages: 231-236(1993)
        摘要：In order to check the fact if the radiation induced post deactivation are possessed by all the enzymes, in this work the radiation effects of horse radish peroxidase (HRP) and glucose oxidase (GOD) were investigated. It was found that in dilute aqueous solution the irradiated HRP has the post deactivation also. The effects of absorbed dose, initial HRP concentration in solution, atmosphere, temperature and additives (three kinds of complex agents: EDTA, CDTA and D)on the post deactivation of HRP were investigated. The regularity of post deactivation of HRP is similar with the catalase. Oxygen in enzyme samples is necessary for the post deactivation. 5×10-3mol/l of the three additives could control the phenomenon efficiently. Of course, the radiation deactivation of HRP was given as well. In the case of GOD the post decativation was not found, although it′s radiation deactivation is also serious. It means that the radiation induced post deactivation is not common phenomenon for all enzymes.  
        关键词：Glucose oxidase;Complex agent;Horse radish peroxidase;Radiation deactivation   
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        发布时间：2023-04-23
      • Zhou Pingkun,Sun Wenzhong,Liu Xueying,Zhang Yangpei,Wei Kang
        Vol. 11, Issue 4, Pages: 237-239,247(1993)
        摘要：The effect of low dose γ-ray pre-exposure on the induction of hprt locus mutations by subsequent high dose challenge in mouse mammary carcinoma SR-1 cells was studied. Pre-exposure of SR-1 cells with 0.01 Gy low dose at 18 h or 24 h before high dose challenging, could significantly decrease the frequency of hprt mutation induced by 3 Gy irradiation. Pre-exposure of cells with 0.01 Gy per day, could result in the above effect at as early as 6 h after the accumulating dose attained 0.1 Gy, the effect lasted at least for 48 h, and the yield of mutations induced by 3 Gy was reduced by 30% to 40%.  
        关键词：Low dose ionizing radiation;Adaptive response;HPRT gene;Mutagenesis   
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        发布时间：2023-04-23
      • Yang Zhiyuan,Guo Yuefeng,Wang Mingming
        Vol. 11, Issue 4, Pages: 240-243(1993)
        摘要：The developmental ratardation of brain in rats induced by prental exposure to HTO had observed by measuring the contents of cerebral amino acids. The HTO was injected intraperitoneally at the 11 th day of gestation with concentration of 7.4×103—3.7×106 Bq/ml (body water). At 18-day-old the young rats were killed and their brains were saparated from skulls. The brains were used to make biochemical speciments for measuring the contents of amino acids.The results showed that the contents of amino acids increases with the dose increased and the relationship between the precentage of the increased contents of amino acids in brain and logarithm of absorbed doses (D, Gy) give a good fit to liner regression equation in range of the absorbed doses from 0.0038—1.9 Gy.  
        关键词：Tritiated water (HTO);Amino acids;Prenatal irradiation;Doseresponse relationship;Rat   
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        发布时间：2023-04-23
      • Yao Suyan,Yukio Takizawa,Junsuke Yamashita,Noriyuki Hachiya,Taihao Quan
        Vol. 11, Issue 4, Pages: 244-247(1993)
        摘要：This paper studied the frequencies of chromosome aberrations in the lymphocytes of roentgenologists who had worked in this hospital at X-ray department for 5—20 years. They had accepted accumulative absorbed doses of 0.02—0.22 mSv/month, from Mar. 1971 to Feb 1991.The dose was not included before Feb. 1971. The results showed that frequencies of chromosome-type aberrations in lymphocytes of roentgenologists exposed to 1.5 Gy γ-rays (dose rate 0.30 Gy/min) were markedly lower than that in the cells of control group irradiated with 1.5 Gy alone (P< 0.001). According to dose levels the roentgenologists were divided into 3 groups, it did not find that the smaller the dose, the stronger the adaptive response.  
        关键词：Abaptive response;Chromosome aberration;Occupational radiation exposure   
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        发布时间：2023-04-23
      • Guo Fengli,Zhang Yizhi,Liu Hechen,Wang Yajun
        Vol. 11, Issue 4, Pages: 248-249(1993)
        摘要：Four types of micro-organisms (B. pumilus E601, S. aureus, B. pyocyaneus and B. coli) exposed to 60Co γ-radition, D10 values were determined. Results indicat that for D10 values were 2.1、0.17、0.07、0.08 kGy respectively. At 10 kGy levels of treatment Bezoar detoxification powder, the number of micro-organisms is zero.  
        关键词：Radiation sterilization;D10 values;Bezoar detoxification powder   
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        发布时间：2023-04-23
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