Impact of alpha-damage and helium production on the heat capacity of actinides oxides
The heat capacity of alpha-damaged uranium, plutonium and americium mixed dioxides (Uu, Puv, Amw)O2±x samples was measured during thermal annealing. The excess of heat released was assessed and the recovery stages associated with various defects described by integrating results from Transmission Microscopy, helium desorption spectroscopy, thermal diffusivity, and XRD annealing studies. It is shown that different defect annealing stages could be single out. It could also be evidenced that the excess of energy stored in defects tends to saturate after rather low damage levels but that, with increasing radiogenic helium production, another contribution of stored energy appears and that can be attributed to the formation of helium-defect complexes that cannot annihilate until higher temperatures are reached.
WISS Thierry;
KONINGS Rudy;
STAICU Dragos;
BENEDETTI Alessandro;
COLLE Jean-Yves;
RONDINELLA Vincenzo;
MAUGERI E.;
TALIP Z.;
JANSSEN Arne;
DIESTE Oliver;
COGNINI Luana;
DE BONA Emanuele;
BALDINOZZI Gianguido;
GUENEAU Christine;
2025-05-15
FRONTIERS MEDIA S.A.
JRC139296
2813-3412 (online),
https://publications.jrc.ec.europa.eu/repository/handle/JRC139296,
10.3389/fnuen.2025.1495360 (online),
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