583. 放射性廃棄物地中処分場の立地選定,(IV)

多核種が共存する場合の放射性核種地中移動

抄録

The migration of single radionuclides disposed of underground have been studied extensively, and many results have been reported. The migration of multiple radionuclides under similar conditions, has, on the other hand, scarcely been studied, and yet it is very important for evaluating the safety of the ground disposal of radioactive wastes.
This paper bases its discussion on two theories (that of frontal analysis proposed by Sillen & Inoue's theory) on the behavior of multiple nuclides. It is shown that frontal analysis is applicable theoretically to the estimation of the migration of multiple radionuclides, but that some difficulties are encountered in its practical use in the field. The difficulties are, for instance, the estimation of the quantities of soil in contact with underground water, and the effect of the diffusion of the nuclides in the underground water. Inoue's theory, on the other hand, well depicts the migration of multiple radionuclides under the ground, but the theory requires field observation of the ground water movement.