Ionic Composition of Hot Particles Containing U,Cs, and Sr,Evaluated from the Parameters of X-ray Photoelectron Spectra of Outer U5f and Inner U4f,Cs3d, 4d,and Sr 3d Electrons |
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| Authors: | Teterin Yu. A. Nefedov V. I. Nikitin A. S. Ronneau C. Vanbegin J. Cara J. Dement'ev A. P. Utkin I. O. Teterin A. Yu. Ivanov K. E. Yarzhemskii V. G. |
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| Affiliation: | (1) Russian Research Centre Kurchatov Institute, Moscow, Russia;(2) Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russia;(3) Université Catholique de Louvain-la-Nueve, Louvain-la-Nueve, Belgium |
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| Abstract: | The elemental and ionic composition of pellets produced from reactor fuel (UO2) containing 0.1 wt % Cs and 0.5 wt % Sr relative to U and also of hot particles generated by heating of the fuel to 2000°C and then subjected to additional heating to 900°C in air or argon and condensed on aluminum support was analyzed by the X-ray photoelectron spectroscopy. It was shown that within the first 20 s of heating U and Cs sublime predominantly. In the subsequent 300 s of heating U, Cs, and Sr sublime. For example, it was found that hot particles collected in the first 20 s of heating and subjected to additional heating at 900°C in air flow contain 68% U and 32% Cs, whereas particles collected in the subsequent 360 s and subjected to the same additional heating contain 51% U, 13% Cs, and 36% Sr. It is assumed that these hot particles incorporate uranyl compounds of the following types: UO2CO3, Cs2UO4, Cs4UO2(CO3)3, CsUO2(OH)3, SrUO4, Sr3UO6, and SrUO2CO3(OH)2. Treatment of the surface of hot particles with Ar+ ions produces changes in their composition. |
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