615. 通気層における放射性核種の移動,(I)

If it is desired to evaluate the potential hazard caused by radioactive wastes buried in the ground, it is necessary to know how radionuclides would migrate through soil especially through aerated zones. However, the rate of underground migration of nuclides has so far been studied far less extensively in aerated zones than in saturated zones, on account of many difficulties underlying such studies.The present paper covers an experimental study based on a model stratum, aimed at obtaining information on phenomena occurring in an aerated zone. Some significant results have been obtained, such as that: (1) The concept of time-transformation factor (Kf-factor) is useful in the present circumstances for evaluating the migration of nuclides in aerated zones, (2) radionuclides would be retained in an aerated zone at least as effectively as in a saturated zone, and (3) the movement of 90Sr in an aerated zone could be predicted from the observed behavior of 90Y, which is a daughter of 90Sr, because 90Y migrates faster than 90Sr.