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Incorporation of REE into Secondary Phase Studtite.

Published online by Cambridge University Press:  30 June 2014

C. Palomo ,
N. Rodríguez ,
E. Iglesias ,
J. Nieto ,
J. Cobos  and
J. Quiñones
C. Palomo*
Affiliation:
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Av. Complutense 40 28040 Madrid, Spain
N. Rodríguez
Affiliation:
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Av. Complutense 40 28040 Madrid, Spain
E. Iglesias
Affiliation:
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Av. Complutense 40 28040 Madrid, Spain
J. Nieto
Affiliation:
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Av. Complutense 40 28040 Madrid, Spain
J. Cobos
Affiliation:
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Av. Complutense 40 28040 Madrid, Spain
J. Quiñones*
Affiliation:
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Av. Complutense 40 28040 Madrid, Spain
*
*javier.quinones@ciemat.es, carmen.pm22@gmail.com
*javier.quinones@ciemat.es, carmen.pm22@gmail.com
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Abstract

The formation of uranyl peroxide phases was identified as a corrosion product of spent fuel by Hanson et al [1]. The subsequent analysis of this phase showed that metastudtite retained 241Am, 237Np and 239Pu [2]. In this study, the retention of radionuclide Pu4+ and An3+, released from the spent fuel matrix into studtite structure, has been evaluated by the precipitation of studtite from uranyl dissolution with variable concentrations of REE (Th, Nd, Sm and Eu). Three different precipitation conditions parameters were studied: media of synthesis, time of synthesis and REE concentration. Synthesized phases were characterized by XRD and the cell parameter was calculated. The REE incorporation was determined by ICP-MS analysis. The results showed that studtite could incorporate 63% of Th in solution during its precipitation. Changes in the “a” cell parameter were identified. The results suggest that studtite coprecipitated with REE could play a role as a limiting for the REE mobility.

Keywords

second phaseslanthanidesU
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1665: Symposium NW – Scientific Basis for Nuclear Waste Management XXXVII , 2014 , pp. 71 - 77
Copyright
Copyright © Materials Research Society 2014 

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References

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