著者

定家 義人 井上 正 望月 肇 賀田 恒夫

出版者

Journal of Radiation Research 編集委員会

雑誌

Journal of Radiation Research (ISSN:04493060)

巻号頁・発行日

vol.22, no.4, pp.387-394, 1981

被引用文献数

2

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When spores of Bccillus subtilis were treated in a frozen state with tritiated glycerol of different concentrations (up to 160 &mu;Ci/ml), efficiencies of killing and mutation induction per absorption dose were higher in solutions of lower tritium concentrations where low dose-rate &beta;-irradiations were performed. Similarly when transforming DNA of Bacillus subtilis was kept with tritiated glycerol solution of concentrations ranging 0.05-500 &mu;Ci/ml at 4&deg;C, efficiency of inactivation of the arginine marker increased strikingly by lowering the tritium concentration. On the other hand, the RBE of DNA-strand scissions of colicin El plasmids exposed to tritiated glycerol of a relatively high concentration (680 &mu;Ci/ml) was found to be approximately 1, when compared at the same absorption dose of gamma-irradiation (36 kR/hr) from a <SUP>137</SUP>Cs source.