NAMTAR: a new computer program for the transport of radionuclides in groundwater flow

The radionuclide migration program NAMTAR is based on methods which differ from conventional finite element or difference schemes and seem more appropriate in cases where diffusion and dispersion effects are small. It tracks points of known concentration as they move in a two-dimensional flow but also allows their concentration values to change under various chemical and physical processes. The basic ideas of the program are described and its use illustrated by a simple example. (author)