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Study of radiogenic helium diffusion in the β-thorium phosphate diphosphate ceramic
Ozgümüs A., Gilabert E., Dacheux N., Tamain C., Lavielle B.
Journal of Nuclear Materials 373 (2008) 112-118 - http://hal.in2p3.fr/in2p3-00273035
Physique/Physique/Chimie-Physique
Study of radiogenic helium diffusion in the β-thorium phosphate diphosphate ceramic
A. Ozgümüs1, E. Gilabert2, N. Dacheux1, C. Tamain1, B. Lavielle2
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
http://ipnweb.in2p3.fr
CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX
France
2 :  CNAB - Chimie Nucléaire Analytique et Bio-environnementale
http://www.u-bordeaux1.fr/cnab
CNRS : UMR5084 – Université Sciences et Technologies - Bordeaux I
BP 120 33175 GRADIGNAN CEDEX
France
$\beta$-Thorium phosphate diphosphate polycrystalline ceramic is considered as a promising candidate for the immobilization of actinides in the field of a long-term storage. In order to study the behavior of the ceramic in relation with the evacuation of helium produced by actinides and daughters disintegrations, the release of radiogenic helium from a sintered pellet aged over an about six year period was studied by thermal desorption and high resolution mass spectrometry. The apparent diffusion coefficients are determined for different annealing sequences and are approximately the same for zircon and britholite at low temperature and uranium dioxide ceramic at high temperature. The apparent diffusion coefficients are found to be (7 ± 3) x 10^-22 m^2 s^-1 and (1.5 ± 0.5) · 10^-20 m^2 s^-1 at 20 °C and 120°C, respectively. The activation energy for the apparent diffusion process encompassing both volume and inter-granular diffusion is estimated at 45 ± 15 kJ mol^-1 in the studied temperature range (20–1020° C).

Articles dans des revues avec comité de lecture
2008
Journal of Nuclear Materials (J. Nucl. Mater.)
Publisher Elsevier
ISSN 0022-3115 (eISSN : 0022-3115)
373
112-118

07.75; 23.60; 66.30