The effects of different doses of r-ray on cochlea are reported in this paper. Significant hearing loss and severe cochlea hair cells injury were found while radiation dose was more than 80 Gy. With 40 Gy to 60 Gy, slight hearing loss, but cochlea hair cells and support cells impairment were observed. With 20 Gy, no hearing loss and no hair cell damage were found. The results indicated that the damage increases with a dose of radiation and there is a delay effect of radiation on cochles.
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