Geosciences Journal

The Association of Korean Geoscience Societies (한국지질과학협의회)
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Sorption properties of 152Eu and 241Am in geological materials: Eu as an analogue for monitoring the Am behaviour in heterogeneous geological environments

Lee, Seung-Gu;Lee, Kil-Yong;Cho, Soo-Young;Yoon, Yoon-Yeol;Kim, Yong-Je

  • Published : 20060000
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Abstract

In order to confirm the similar behavior of Eu andAm in heterogeneous geological materials, we carried out thebatch experiments for determining the sorption property of radi-onuclides, 152Eu and 241Am. We used four different types of coreand andestic tuff, and selected two samples per each lithology, oneof which is fracture-bearing and another is fracture-free. Except formetabasites, rock samples of each type are similar in their compo-sitions. We calculated sorption ratios of two radionuclides from theexperimental results. Biotite gneiss and tuff had similar sorptiontrends for 152Eu and 241Am regardless of the existence of fractures,whereas two metabasite samples showed very different sorptionproperties. Such difference in the sorption trends revealed a closerelationship with chemical compositions of the host rocks. Never-theless, 152Eu and 241samples with variable contact times regardless of petrography andpH variations, and particularly, the sorption trends of 152Eu and241Am in the metabasites were similar. This observation sugeststhat Eu and Am have similar sorption properties on geologicalmaterials. Therefore, Eu can be used as a useful analogue of Amin all kinds of geological environments regardless of variations inlithology and pH of groundwater. In addition, sorption ratios of152Eu and 241Am are correlated with the contents of P2O5 and TiO2,suggesting that the chemical components such as P2O5 and TiO2might be important for deciphering the interaction betwen theradionuclide and groundwater.

Keywords

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