" Factors Controlling Radionuclides Migration Within Different Media"

Abstract

This study aims to examine the mobility and its isotopes and daughters during the acid leaching. In the same context the study of the daughter / parent ratios in three phases, original samples, leach liquor and residue will gave a complete picture about the behavior during weathering and alterations of these rocks. Five samples of different rock types were collected and prepared for various analyses. Wet chemical analyses were carried out for major oxides and trace elements. Natural radionuclides were measured by HPGe detector in original samples, pregnant solutions and residuals. The results showed that the relation between the sum of activities of 238U in both pregnant solutions and residuals with originals have two modes. The first mode is represented by the sum of 238U activities in leachate and residual is nearly equal the activity in the original sample. In the second mode the sum is higher than the original, sometimes twice or more. The well noticed thing the samples of the second mode show high content of Pb (2060-4343 ppm). The behavior of 226Ra in the acidic leaching is completely different from 238U and its isotopes. Selective leaching studies have shown that uranium isotopes are leached to the same extent but that is not absorbed in 234U. The lowest leachability in all the samples is present in 226Ra, 214Pb and 214Bi.