Modelling was also carried out on tracer experiments designed to examine the effects of changing the length of the dipole flow field on tracer breakthrough curves.

The graphs below show a good agreement between the results of the tracer tests (left) and the results of modelling (right)

This has allowed an understanding of the effects of scale on transport properties to be achieved.

Model analysis was then carried out where matrix diffusion and sorption were included over varying transport distances. The graphs below demonstrate that as transport distances increase (from 1 m to 10 m to 100 m) the effect of matrix diffusion and sorption in the rock has a large effect on radiotracer breakthrough.