Comparative evaluation of environmental effects between ionizing radiation and chemicals using an experimental ecosystem model

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Acute γ-irradiation experiment was carried out in an experimental ecosystem model consisting of eight taxa of aquatic microorganisms. Various indirect effects due to interspecies interactions, some of which had not been known in aquatic microbial community, were detected. It was also demonstrated that radiosensitivity was different with cultural stage. These results will contribute to improvement of current frameworks for radiation protection of the environments. Effect doses of γ-rays and various chemicals were evaluated for the entire system. This result will contribute to a better understanding of environmental risks of ionizing radiation compared with chemicals.