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Effects of Ionizing Radiation on Plants and the Radiological Protection of the Environment
Stanislav A.,Geras'kin,Kim, Jin Kyu 한국환경생물학회 2003 환경생물 : 환경생물학회지 Vol.21 No.4
Differences between the principles for the radiological protection of man and the environment are compared. The derived levels of exposure for man and biota recommended by the international agencies with dose rates for chronic radiation producing effects at different levels of biological organization were given in terms of the biological effects. Cytogenetic effects on plants after an exposure to ionizing radiation at low doses alone and in combination with other factors are discussed. A wide range of experimental data were analysed and the general conclusions were extracted to cover the topics such as non-linearity of dose response, synergistic and antagonistic effects of the combined exposure of different factors, radiation-induced genomic instability, and the phenomena of radioadaptation.
Non-linear Responses of Hordeum vulgare Germs to Low Doses of Ionizing Radiation
( Jin Kyu Kim ),( Stanislav A. Geraskin ),( Alla A. Oudalova ),( Vladimir G. Dikarev ) 한국환경생물학회 2003 환경생물 : 환경생물학회지 Vol.21 No.4
N/A Abstract - The induction of chromosome aberrations in Hordeum uulgare germs afterirradiation is studied for the dose range of 10 to 1,000 mGy. The relationship between the frequency of aberrant cells and the absorbed dose is shown to be non-linear and has a dose-independent plateau within the range of 56-467 mGy where the level of cytogenetic damage is statistically significantly distinguished from the spontaneous level. The comparison of the goodness of the experimental data fitting with mathematical models of different complexities, using the most common quantitative criteria, demonstrates the benefit of the piecewise linear model over the linear and polynomial ones in approximating the cytogenetical disturbance frequency. The results of our study support the conclusion about indirect mechanism of chromosome aberrations induced by low doses or dose rates mutagenesis.