Apparent diffusion coefficients and chemical species of neptunium (V) in compacted Na-montmorillonite

摘要

Diffusion of neptunium (V) in compacted Na-montmorillonite was studied through the non-steady state diffusion method. In this study, two experimental attempts were carried out to understand the diffusion mechanism of neptunium. One was to establish the diffusion activation energy, which was then used to determine the diffusion process in the montmorillonite The other was the measurement of the distribution of neptunium in the montmorillonite by a sequential batch extraction.