Abstract

Disposal of radioactive solids or solidified wastes in the ground is at present forbidden in Japan, mainly because of the difficulties in the evaluation of the migration of leaked radionuclides and of the radiation dose to which the public would be exposed by the disposed wastes. First of all, the behavior and the migration of radionuclides in the environment is quantitatively expressed. Then, the internal dose rate received by the public is estimated under suitable assumptions.Ten radionuclides contained in radioactive wastes and three ecological paths of the nuclides in the environment are discussed (i.e. the paths through drinking water, sea foods qnd vegetables). It is concluded that the critical nuclides in this disposal scheme are 90Sr and 110mAg, and that the internal dose is mainly governed by the intake through vegetables. The safety of the ground disposal of radioactive wastes is also evaluated.

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