Leaching kinetics of Mn-54 and Sr-89 radionuclides fixed in cement-vermiculite composition

Leach characteristics of Mn-54 and Sr-85 radionuclides from ordinary Portland cement have been studied using International Atomic Energys (IAEA) standard leach method. The retardation factors, K-F, and coefficients of distribution, k(d), have been determined using a simplified mathematical model for analyzing the migration of radionuclides. The lowest leaching values after 60 days were achieved in samples with 5% of vermiculite. Results presented in this paper are the examples of results obtained in a 10 year mortar and concrete testing project, which will influence the design of the engineered trench system for a future central Serbian radioactive waste storage center