Modelling of U, Th, Ra and 137Cs radionuclides behaviour in rivers. Comparison with field observations

Characterization of local geochemical anomalies in soils and stream sediments for improving land-use planning: A case study from Nisa, Portugal

“…For an initial analysis of this, it is advisable to evaluate metal/semi-metal dispersion and bioavailability according to the environmental factors that influence the transport and dynamics of elements within different mediums and between different mediums (for example, water-soil-plant systems). Physical and reactive transport capacity in mediums depends on various environmental factors (Zheleznyaket al, 1997;Rodriguez-Alvarez et al, 2000;IAEA, 2001;Neiva et al, 2016). For these reasons, there is a high probability that proportions of metals and semi-metals in an area are not "geo-available" or "bio-available", and therefore only a proportion of each measured concentration is available in a contamination sense.…”