DESCRIPTION :
The position to be filled is in the Radiochemical and Chemical Analysis Laboratory (LARC).
The laboratory carries out analyses on radioactive samples in support of French nuclear reactors (power generation and Naval Propulsion), but also in support of Cadarache facilities and in the fields of decontamination and dismantling.
Work will mainly take place in the part of LARC located in building 152, nuclear ICPE (classified installations for environmental protection). Depending on their activity, some of the samples may be prepared in the other part of LARC, laboratory C5, located within an INB (basic nuclear installation)., At CEA, you'll put your skills and enthusiasm to work on major societal projects.
As a post-doc, you will join the IRESNE team: the Institute for Research on Nuclear Systems for Low-Carbon Energy Production at CEA Cadarache.
The characterization of nuclear waste represents a major challenge for nuclear sites, which must accurately measure a diverse range of fission products, activation products and naturally occurring radionuclides in various matrices.
Long-lived radionuclides (LLRN) are present in both spent nuclear fuel and reprocessed waste. Accurate assessment of the inventory of LLRNs is therefore a key issue in guaranteeing the long-term safety of deep geological waste disposal. Quantifying long-lived radionuclides generally involves chemical separation steps to remove interferents, separate the radionuclide of interest from the matrix and pre-concentrate it prior to measurement by radiometry or mass spectrometry.
ICP-MS has expanded the number of radionuclides that can be measured compared with radiometric techniques. Nevertheless, the measurement of RNVL remains complex, due to the generally very low concentrations in samples and to spectral interferences during ICP-MS measurements.
Selenium 79 (79Se) is one of the seven main long-lived fission products, but very few actual quantifications of 79Se in real samples are reported in the literature (less than 20 publications). For direct quantification in fuel cladding dissolutions, a detection limit of less than ng/L is required.
The main goal of this post-doctoral project is to develop a method for quantifying 79Se in nuclear waste, and more specifically in zircaloy cladding from spent fuel.
You will be responsible for :
- Preparing samples.
- Setting up protocols for the separation of selenium by ion exchange chromatography.
- Development of an ICP-MS/MS measurement method (choice of reaction/collision gas, optimization of measurement parameters, correction of mass bias, etc.) to eliminate interferents and achieve the best possible detection limit.
- Interpretation of the results obtained.
- Presentation of results at scientific conferences and publication in peer-reviewed journals.
Depending on the progress of the project, the missions may be extended for a further year to include the quantification of 107Pd and 126Sn.
Code d'emploi : Ingénieur Nucléaire (h/f)
Domaine professionnel actuel : Ingénieurs, Projeteurs et Techniciens de l'Industrie Chimique
Niveau de formation : Bac+8
Temps partiel / Temps plein : Plein temps
Type de contrat : Contrat à durée indéterminée (CDI)
Compétences : Selenium, Français, Enthousiasme, Esprit d'Équipe, Motivation Personnelle, Innovation, Chromatographie, Propulsion, Chimie Analytique, Décontamination, Protection de l'Environnement, Gestion des Déchets, Isotopes, Techniques de Laboratoire, Spectrométrie de Masse, Industrie Nucléaire, Génie Nucléaire, Réacteur Nucléaire, Recherche Post-Doctorale, Quantification, Capacités de Démonstration, Production d'Énergie
Courriel :
internet.saclay@cea.fr
Téléphone :
0160833031
Type d'annonceur : Employeur direct
