Degradation of Thymine in Aqueous Solution Containing ^3HHO. Comparison with ^<60>Co Gamma-Radiolysis
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概要
- 論文の詳細を見る
Thymine aqueous solutions were prepared at a concentration of 5 × 10^<-4> M (contained ^<14>C-thymine and buffered at pH 7.0) and were irradiated with 60Co gamma-rays and ^3H beta-rays from ^3HHO, in the presence of N_2, O_2, N_2O or t-BuOH-N_2. Thin-layer chromatography was carried out bidimensionally and autoradiography was performed. Considerable difference in the dose-yield curves was observed between beta-irradiation and gamma-irradiation. Oxygen enhancement ratio, 1.35 and 1.06 at a dose of 1.5 × 10^3 Gy, were obtained by gamma-rays and by beta-rays, respectively, for thymine degradation. Oxygen effect on product formation was very low in beta-irradiation. The yield of 5-hydroxy-5-methylbarbituric acid + 5-hydroxy-5-methylhydantoin was much higher in beta-irradiation than in gamma-irradiation under N_2 and N_2O. These results lead to the conclusion that in beta-irradiation there could be a progression of oxidation of materials with some species differed from OH radicals.
- 日本放射線影響学会の論文
著者
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YAMAMOTO Osamu
Department of Applied Chemistry, Kanagawa Institute of Technology
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Yamamoto O
Hiroshima Univ.
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FUJI IZUMI
Department of Radiation Biology, Research Institute for Nuclear Medicine and Biology, Hiroshima Univ
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Fuji I
Hiroshima Univ.
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Fuji Izumi
Department Of Radiation Biology Research Institute For Nuclear Medicine And Biology Hiroshima Univer
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Yamamoto Osamu
Department Of Applied Chemistry Kanagawa Institute Of Technology
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