A5057202635- Radioactive element chemistry and processing
- Radioactive contamination and transfer
- Nuclear Materials and Properties
- Nuclear Physics and Applications
- Radioactivity and Radon Measurements
- Nuclear reactor physics and engineering
- Extraction and Separation Processes
- Nuclear materials and radiation effects
- Atmospheric Ozone and Climate
- Nuclear and radioactivity studies
- Radiation Detection and Scintillator Technologies
- Metal Extraction and Bioleaching
- Chemical Synthesis and Analysis
- Geochemistry and Geologic Mapping
- Mining Techniques and Economics
- Geological and Geochemical Analysis
- Astro and Planetary Science
- Lanthanide and Transition Metal Complexes
- Analytical chemistry methods development
- Chemical and Physical Properties in Aqueous Solutions
- Atomic and Molecular Physics
- Isotope Analysis in Ecology
- Biochemical and Structural Characterization
- Environmental Toxicology and Ecotoxicology
- Surfactants and Colloidal Systems
CEA DAM Île-de-France
2011-2025
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2025
CEA Paris-Saclay
1985-1986
Direction des énergies
1986
Laboratoire Structure et Dynamique par Résonance Magnétique
1985
South African Nuclear Energy Corporation (South Africa)
1971
Since the end of nuclear weapon testing, anthropogenic metallic radionuclides have originated from accidents such as Chernobyl and Fukushima controlled releases industry. 60Co is an activation product found in effluents power plants, mobile reactors, fuel reprocessing facilities. In this paper, we are addressing question (radio)cobalt speciation upon bioaccumulation sentinel organism Mytilus galloprovincialis after vivo contamination a pseudo-natural system. For study, inductively coupled...
This study investigates the chemical durability of uranium oxide microparticles (UO2+x and U3O8), as potential reference materials for nuclear safeguards. To optimize long-term preservation, particles were exposed to three different storage media: dilute nitric acid (10–2 mol L–1 HNO3), deionized water, ethanol. Dissolution rates in (∼5 × 10–4 g.m–2.d–1) similar those bulk oxides, but UO2+x experienced greater absolute leaching due their higher specific surface area, resulting noticeable...
The determination of very low concentrations plutonium, in the femtogram per millilitre range, environmental samples using ICP-MS can be interfered by polyatomic species containing heavy elements, from hafnium to bismuth. Mass-to-charge ratios these are close ones plutonium isotopes and cannot separated them resolution mode currently used for trace analysis. In this paper, we present an evaluation extent impact interferences on background at masses 239Pu 240Pu, based measurement three years...
The isotopic analysis of micrometer sized uranium bearing particles, released from nuclear facilities, has been proven to be an efficient tool for safeguarding purposes. However these analyses are not always sufficient identifying specifically some crucial operations, like conversion, which most the time carried out with natural uranium. A secondary ion mass spectrometry (SIMS) methodology detect and analyze particles that contain both fluorine is described. Following particle detection,...
A direct and simultaneous analysis of the age isotopic composition nuclear material at particle scale is described in this study. By comparison with other conventional techniques such as inductively-coupled plasma mass spectrometry or thermal-ionization spectrometry, secondary ion enables one to determine ages individual particles a mixture materials. Having access purification date can give precious information on history facility for safeguarding purposes. The high sensitivity technique...
Abstract The analysis of individual micrometre- and submicrometre-sized particles collected by IAEA’s safeguards inspectors on swipe samples during in-field verification activities requires the implementation a sustainable quality control system such as suitable microparticulate reference materials. To this end, pure neodymium-doped uranium oxide-based microparticles utilising an aerosol-based particle production process were prepared. SEM/EDX measurements confirmed monodispersity produced...
Le diagramme de phase a été établi pour des mélanges H2O/NaDEHP en toutes proportions dans l'intervalle température — 80 à + 270 °C par analyse calorimétrique différentielle et résonance magnétique nucléaire. Aux faibles concentrations NaDEHP, vésicules ont mises évidence micrographie. Lorsque la concentration augmente, phases lyotropes lamellaire, cubique centrée inverse hexagonale inverse, séparées domaines démixtion, caractérisées ambiante diffraction rayons X microscopie optique lumière...
Numerous applications require the precise analysis of U isotope relative enrichment in sample amounts subnanogram to picogram range; among those are nuclear forensics, safeguards, environmental survey, and geosciences. However, conventional thermal ionization mass spectrometry (TIMS) yields combined transmission efficiencies (i.e., ratio ions detected atoms loaded) less than 0.1% or 2% depending on loading protocol, motivating development sources capable enhancing ionization. The new...