Mes compétences :
Spectrométrie de masse
Géochimie
Géologie
Analyse par faisceau d'ions
Entreprises
Universität Bern
- Postdoctoral researcher
2012 - maintenant
CEA Saclay
- Postdoctoral researcher
Gif-sur-Yvette 2011 - 2012
Université Bordeaux 1
- PhD student
Talence2007 - 2010Noble gases diffusion in the Callovo-Oxfordian pore water of the Andra Underground Research Laboratory transposition zone
The French Radioactive Waste Management National Agency (ANDRA) is studying the
possibility of a high level and long lived radioactive waste repository in geological formation.
Since 1994, Andra is studying the properties of the Callovo-Oxfordian (COx) argillaceous
rock, located in the eastern part of the Paris Basin. In the designated zone, COx is a 130
meters thick clay rich sequence, found at a depth of about 500 meters and encompassed
between two aquifers, the Oxfordian limestone above and the Dogger limestone below.
Callovo-Oxfordian permeabilities are very low, which is suitable with radioactive waste
disposal.
Noble gases (He, Ne, Ar, Kr and Xe) are considered as natural tracers, useful in
hydrogeology, for several reasons. First, noble gases are nearly chemically inert, and then no
reaction occurs between them and other species. Secondly, noble gases have several isotopes
and many of them have different origins, so it is possible to distinguish sources terms.
To have more information on the COx properties, Andra has selected four drilling sites in a
250 km2 area. From November 2007 to June 2008, on each site, Callovo-Oxfordian clay and both overlaying and underlying limestones were investigated.
On each drilling sites, pore water noble gases concentrations were performed by mass spectrometry.
Calculations using a 1-D model were done.
