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The Use of Cerium Valence State for Evaluation of Accessory Minerals Durability to Radiation Damage

Published online by Cambridge University Press:  21 March 2011

Roman V. Bogdanov ,
Yuri M. Zaytsev  and
andrey S. Sergeev
Roman V. Bogdanov
Affiliation:
Department of Chemistry, Saint-Petersburg State University, 199034, St. Petersburg, Russia; e-mail: r.bogdanov@RB7584.spb.edu
Yuri M. Zaytsev
Affiliation:
Department of Chemistry, Saint-Petersburg State University, 199034, St. Petersburg, Russia; e-mail: r.bogdanov@RB7584.spb.edu
andrey S. Sergeev
Affiliation:
Department of Geology, Saint-Petersburg State University, 199034, St. Petersburg, Russia
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Abstract

Cerium-actinide bearing natural minerals which demonstrate their long-time physicochemical durability under the environment effect would be considered as analogues of actinide ceramic waste forms. Radiation damage of crystalline materials causes oxidation of cerium from initial Ce(III) to Ce(IV). Therefore, cerium valence state in actinide-cerium bearing natural minerals in some cases reflects the resistance of such minerals to radiation damage. Cerium valence state was determined in the following natural minerals of similar age and similar U-Th-contents: monazite (four samples), britholite (two samples), and aeschynite (one sample). The method of chemical shifts of X-ray emission (CeKá1 line) was used. The following contents of Ce(IV) were observed: more then 30 % in britholite, 11 % in aeschynite, 0 % in monazite. The results obtained suggest that durability of these actinide host phases with respect to radiation damage decreases in the monazite-aeschynite-britholite series.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 713: Symposium JJ – Scientific Basis for Nuclear Waste Management XXV , 2002 , JJ11.26
Copyright
Copyright © Materials Research Society 2002

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References

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