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This experiment was carried out to identify and to compare the radiosensitivities of bacteria isolated from the sources of different radiation exposure histories. Among 10 strains isolated in this investigation, 4 strains of bacteria, Bacillus firmus, Bacillus brevis, Baciilus subtilis and Bacillus sphaericus were isolated from high and low radioactive sites simultaneously. Bacterial strains isolated from radioactive sources such as reactor and isotope production rooms were more resistant to irradiation than the micro organisms from medical products and laboratories, however, there was no significance in radiosensitivity in the same species of bacteria, even if they were isolated from different radiation exposure histories.
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