Transfer of natural radionuclides from soils to plants in a wet marshland

Soils and two wild plant species (Spartina densiflora and Spartina maritima) have been collected from the Odiel river marsh and analysed for 210Po and 238U. The radioactivity concentrations in plants and soils reflect the impact of the operation of two phosphoric acid production factories located close to the marsh. Concentrations ratios (CR) of these radionuclides, between plant and underlying soil, have been studied. First results show that the concentration ratios (CR) seem to be dependent on radionuclide soil concentration.