Bulg. J. Phys. vol.27 no.2 (2000), pp. 009-012


The Study of Ionic Composition of the "Hot" Particles Containing U and Sr Formed Due to the Nuclear Power Plant Accident Simulation on the Basis of the "Hot" Particles Containing U and Sr Formed Due to the Nuclear Power Plant Accident Simulation on the Basis of the U5f-,4f- , and Sr3p-,3d- XPS Parameters

Yu.A. Teterin1, V.I. Nefedov2, C. Ronneau3, J. Vanbergin3, J. Cara3, I.O. Utkin1, A.P. Dementiev1, A.Yu. Teterin1, A.S. Nikitin1, K.E. Ivanov1, L.J. Vukchevich4, Dj. Bek-Uzarov5
1RRC
2Kumakov Institute of General and Inorganic Chemystry of RAS, Lenisky prosp ., 31, Moscow, Russia
3University calholique de Louvain, Department INAN 2, 13413 Louvain-la-Neuve, Belgium
4Natural-mathematical department, Podgorica, Yugoslavia
5VINCA Institute of Nuclear Sciences, Belgrade, Yugoslavia
Abstract. The XPS elemental and ionic quantitative analysis of the reactor fuel (UO2) containing Sr before and after 6 minute heating in argon at 2300℃ as well as of the "hot" particles formed during this heating, was carried out. The heating was shown to cause Sr ions to diffuse toward the sample surface and then to sublime partially. Uranium ions of lesser than U(IV) oxidation state formally referred to as U(III) formed after such heating in reactor fuel. The condensed phase of the "hot" particles was found to consist of strontium (47 and 71 at.%) and uranium (53 and 29 at.%) ions respectively. Carbonates were formed on the surface during this process. After the Ar+ cleaning, the number of carbonate groups on the surface decreased significantly but the ratio U(IV)/U(Vl) changed. The formation of uranyl compounds like SrU)3, Sr3U)6 and SrUO2C03(OH)2 was suggested.

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