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Two fundamental concerns must be addressed when attempting to isolate  low-level waste in a disposal facility on land. The first concern is  isolating the waste from water, or hydrologic isolation. The second is  preventing movement of the radionuclides out of the disposal facility, or  radionuclide migration. Particularly, we have investigated the latter  modified scenario. To assess the safety for disposal of radioactive  waste-concrete composition, the leakage of 60Co from a waste composite into a  surrounding fluid has been studied. Leakage tests were carried out by  original method, developed in Vinca Institute. Transport phenomena involved  in the leaching of a radioactive material from a cement composite matrix are  investigated using three methods based on theoretical equations. These are:  the diffusion equation for a plane source an equation for diffusion coupled  to a first-order equation, and an empirical method employing a polynomial  equation. The results presented in this paper are from a 25-year mortar and  concrete testing project that will influence the design choices for  radioactive waste packaging for a future Serbian radioactive waste disposal  center

Mathematical modelling of transport phenomena in concrete matrix