U- and Th-isotopes in an estuarine system in southwest Spain: Tidal and seasonal variations

The presence of U- and Th-isotopes in suspended matter from an estuarine system which surrounds a phosphate fertilizer processing complex has been investigated. A clear radioactive impact from the complex has been confirmed since up to 86 and 116 μg/g of U and Th respectively have been detected. The effect of tides and seasonal conditions, temperature and salinity, on the results has also been investigated. Some distribution coefficients are given.