Abstract
Among the numerous uranium ore deposits and indications that have been discovered in Japan, the important uranium occurrences are found as strata-bound epigenetic ore deposits. These deposits occur in the basal part of Neogene sedimentary rocks unconformably overlying granitic basements. Major groundwater migration is observed at the unconformity between the Neogene sediments and the granitic intrusives. The function of groundwater at the unconformity is thought to be a migrating agent for uranium from source rock to the ore deposit and the function is the most important factor of the epigenetic concentration of uranium. The behaviour of uranium in the epigenetic ore deposits are suggesting that important factors to consider in the radionuclides migration accompanied with groundwater are the flow and velocity of groundwater migration, the relationship between nuclide and surrounding geologic media, and the physico-chemical environment. Furthermore, this behaviour is suggesting that the travelling time of radionuclide migration from repository to human living zone should be estimated by the integration of these important factors of individual part in geologic media distributed on the way of groundwater migration. The travelling time of isolated radionuclides is the key factor in the concept of radioactive waste isolation in geologic media.
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