Volume 40, May 2005ECORAD 2004
|Page(s)||S61 - S65|
|Published online||17 June 2005|
A study of the bioavailability of 90Sr, 137Cs, and 239+240Pu in soils at two locations of Spain affected by different radionuclide contamination events
University of Extremadura, Department of Physics, Avda. de la Universidad s/n,
10071 Cáceres, Spain, e-mail: email@example.com
2 Centro de Investigaciones Energéticas Medioambientales y Tecnológicas, Madrid, Spain
It is well known that the bioavailability of artifical radionuclides such as 90Sr, 137Cs and 239+240Pu in contaminated soils depends on the source term origin of the contamination. Altough the behaviour of the mentioned radionuclides in the soil is also influenced by the time passed from the contamination event and the characteristics of the contamination receiving soils. The objective of the present work is to analyse the different bioavailability and possible chemical-physical associations of 90Sr, 137Cs, and 239+240Pu in soils located in different Spanish ecosystems (Almeria and Cáceres provinces) by application of a sequential extraction procedure based on the NIST standard sequential extraction protocol. The resulting fractions obtained are: a) water soluble and exchangeable, b) associated to organic matter, and c) residual fraction. They will be studied jointly with the polluting sources (deposit of nuclear fallout-50s and 60s, Palomares accident in 1966 and the cesium release by Acerinox in 1998) in each ecosystem to interpret the observed behaviour of radionuclides.
© EDP Sciences, 2005
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