Abstract
It hasn't been clear known how an individual biological response affects the risk of radiation at a dose of low dose/low dose-rate radiation. We think the response would be elucidated, because the effects of the low level radiation on tissues and whole body might be important rolls. We would use model mice about the carcinogenesis regarded as the main factor of the radiation risk. We would evaluate dose/dose-rate dependence of the onset diseases in the intestine, and here shall present its preliminary results.