低剂量γ辐射对青海弧菌Q67的毒性研究

Abstract

Abstract: The effects of low dose and ultra-low dose γ radiation on luminous intensity and optical density (OD₆₀₀) of Qinghai Vibrio Q67 were studied using biological irradiator and simulated uranium irradiation chamber as γ radiation source. The results showed that the luminous intensity inhibition rates of Qinghai Vibrio Q67 were no significant difference when the cumulative radiation dose varied within a certain range at a dose rate of 5.5 cGy/min. Once over the dose threshold value in this range, there was a positive correlation between the luminous intensity inhibition rate and the cumulative radiation dose. Moreover, Qinhai Vibrio Q67 irradiating with 320 mGy cumulative radiation dose at three different irradiated dose of 5.5, 14 and 51 cGy/min, it was found that its luminous intensity inhibition rate increased on the condition of low dose rate and long time γ ray radiation. Qinhai Vibrio Q67 irradiated with γ rays at ultra low dose rate for long time the inhibition rate of the OD₆₀₀ value reached the maximum at 24 h, and then reduced gradually. The hormesis of Qinghai Vibrio Q67 occurred with γ dose rates both at 30 and at 120 μGy/h. It was feasible to establish biological early warning method by calculating the inhibition rate of luminous intensity and OD₆₀₀ values of Qinghai Vibrio Q67 in low dose and ultra-low dose γ irradiation.

Key words: Qinghai Vibrio Q67, low dose rate exposure, simulated uranium irradiation chamber, biological warning

CLC Number:

X826

Zhao Weichao, Hu Nan, Ding Dexin, Long Dingxin, He Shuya, Li Le, Hu Miao, Feng Yongfu. Study on toxicity of low dose γ radiation to Qinghai Vibrio Q67[J].RADIATION PROTECTION, 2017, 37(2): 138-144.

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Study on toxicity of low dose γ radiation to Qinghai Vibrio Q67

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