The sorption and migration of 137 Cs in two kinds of clay materials have been studied and the feasibility of clay as filling materials is discussed. The sorption ratio and equilibrium time for the two clay materials were measured with the intermittence method and the effects of clay grain size
materials property and water phase pH value on the sorption ratio was studied. And the sorption isothermal line was found to be a straight line. The results show that the two kinds of clay as filling materials of waste disposal can