|Radioisotopes||137Cs, 134Cs, 103Ru, 106Ru, 60Co, 124Sb, 125Sb|
The method presented here specifies the minimum requirements and laboratory methods for preconcentration before gamma-spectrometry measurement of dissolved cesium, antimony, cobalt and ruthenium in large volume water sample.
It is based on the co-precipitation of MnO2 + KCFC. MnO2 co-precipitates the hydrolysed forms of cobalt, ruthenium and antimony. Cesium is co-precipitated by addition of fine particles of KCFC (<100 μm, 8 to 10 g). This precipitate, brought to pH 3 – 3.5, makes it possible to obtain the best extraction yields, in particular for antimony. In order to obtain good extraction yields, the precipitate is also kept in suspension for a minimum of 3 hours (stirring by air bubbling) before decanting (Gandon and Guéguéniat, 1992; Bailly-du-Bois et al., 1999)
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