1 Risø National Laboratory for Sustainable Energy, Technical University of Denmark2 Center for Nuclear Technologies, Technical University of Denmark3 unknown
Soil samples from areas in Belarus, Russia and Sweden contaminated by the Chernobyl accident were analysed for I-129 by radiochemical neutron activation analysis, as well as for Cs-137 by gamma-spectrometry. The atomic ratio of I-129/(CS)-C-137 in the upper layer of the examined soil cores ranged from 0.10 to 0.30, with an average of 0.18, and no correlation between I-129/Cs-137 ratio and the distance from Chernobyl reactor to sampling location was observed. It seems feasible to use the I-129/Cs-137 ratio to reconstruct the deposition pattern of I-131 in these areas. The association of I-129 and (CS)-C-137 in the Chernobyl soil and Irish Sea sediment was investigated by a sequential extraction method. Similar speciation of I-129 in the Chernobyl soil and Irish Sea sediment was found. Approximately 70% of I-129 is bound to oxides and organic matter, and 10-20% is in the readily available phase, while most of the (CS)-C-137 (73%) in Chernobyl soil remains in the extraction residue. (C) 2002 Elsevier Science B.V. All rights reserved.
Science of the Total Environment, 2003, Vol 308, Issue 1-3, p. 97-109