Journal of Radiation Research
Online ISSN : 1349-9157
Print ISSN : 0449-3060
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Volume 16, Issue 3
Displaying 1-4 of 4 articles from this issue
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  • Reactions of Hydroxyl Radicals with Nucleic Acid Bases and the Related Compounds in Gamma-irradiated Aqueous Solution
    T. MASUDA, H. SHINOHARA, M. KONDO
    1975 Volume 16 Issue 3 Pages 153-161
    Published: September 15, 1975
    Released on J-STAGE: July 14, 2006
    DOIhttps://doi.org/10.1269/jrr.16.153
    JOURNAL FREE ACCESS
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    Rate constants for reactions of hydroxyl radicals with nucleic acid bases and the related compounds were determined by the p-nitrosodimethylaniline method. For addition reaction of hydroxyl radical to the compounds, reactivity indices, namely free valence, localization energy, frontier-electron-density and superdelocalizability, were calculated by Hückel MO method. Among the examined reactivity indices, superdelocalizability was found to have a linear correlation with logarithms of relative rate constants of pyrimidine bases, while the correlation was not observed for purine bases.
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  • Analyses of Radioprotective Action and Cytotoxicity of Various Sulfhydryl Compounds in Cultured Mouse L Cells
    M. HIKITA, M. HORIKAWA, T. MORI
    1975 Volume 16 Issue 3 Pages 162-172
    Published: September 15, 1975
    Released on J-STAGE: July 14, 2006
    DOIhttps://doi.org/10.1269/jrr.16.162
    JOURNAL FREE ACCESS
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    The radioprotective action and cytotoxicity of various sulfhydryl compounds ; 2-mercaptopropionylglycine (MPG), 2-mercaptopropionylglycine-amide (MPG-amide), 2-mercaptopropionylphenylalanine (MPPA), 2-mercaptopropionylphenylglycine (MPPG), 3-mercaptopropionylglycine (3-MPG), AET, cysteine and cysteamine were compared in irradiated and unirradiated mouse L cells using colony forming ability as a criterion. It was indicated that the sulfhydryl compounds divided into three classes, according to their radioprotective action and toxicity. Most effective radioprotection was obtained by cysteamine and cysteine, followed by AET and MPGamide in that order. Toxicity of these sulfhydryl compounds were generally observed in concentrations in the range of 0.1-2 mM, while they are much less toxic and effectively radioprotective in higher concentration, especially in cysteamine and cysteine. On the other hand, MPG, MPPA, MPPG and 3-MPG were all non-toxic and generally ineffective in protecting irradiated cells, except that MPG in concentrations around 0.02 mM and 15 mM and MPPA and 3-MPG around 15 mM have a slight but significant protective action.
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  • Thermoluminescence Studies on Plant Seeds of Different Radiosensitivity
    H. YAMAGUCHI, H. EGUCHI, Y. KOIZUMI
    1975 Volume 16 Issue 3 Pages 173-183
    Published: September 15, 1975
    Released on J-STAGE: July 14, 2006
    DOIhttps://doi.org/10.1269/jrr.16.173
    JOURNAL FREE ACCESS
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    The thermoluminescence was found when the pulverized powders from the whole seeds of six plant species or the hypocotyls from the seeds of five soybean varieties were irradiated at a liquid nitrogen temperature with gamma-rays. The spectra of luminescence emitted, the light peak temperature, the decaying after irradiation and the dose relationship of luminescence were determined. A high yield of the rapidly-decaying luminescence occurred in the more radiosensitive variety when irradiated with relatively lower doses. The very drastic decrease of the thermoluminescence was observed in the samples irradiated at room temperature prior to the exposure at 77°K.
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  • Accumulation of Radionuclides in Coastal Sediment of Japan (II) Contents of Fission Products in Some Coastal Sediments Collected in 1966-1972
    K. NAKAMURA, Y. NAGAYA
    1975 Volume 16 Issue 3 Pages 184-192
    Published: September 15, 1975
    Released on J-STAGE: July 14, 2006
    DOIhttps://doi.org/10.1269/jrr.16.184
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    The concentrations of fission products 90Sr, 137Cs and 144Ce in the marine sediment of Tokyo Bay and of the coastal seas of Ibaraki, Fukushima and Fukui prefectures were determined during 1966 to 1972. The radioactivity ranged 0 to 23.3 pCi/kg-dry for 90Sr, 5.3 to 220 pCi/kg-dry for 137Cs and 0 to 12, 700 pCi/kg-dry for 144Ce.
    Generally speaking, the 90Sr level is one order of magnitude lower than that of 137Cs, and 144Ce concentration is higher than that of 90Sr by almost two orders of magnitude. The degree of the radionuclide enrichment in the sediment from sea water is tens for 90Sr, 102 for 137Cs and apparently 104 for 144Ce, respectively.
    The wide variation is observed in the horizontal distribution of 144Ce concentration in the sediment of the areas, but the 137Cs concentration shows fairly small horizontal fluctuation.
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