MOISY , Philippe

Les éléments actinides forment une famille chimique distincte dans le bas du tableau périodique. Leur numéro atomique élevé ainsi que leur radioactivité sont deux des caractéristiques majeures de ces quatorze éléments. La chimie des actinides, dont l'essor au XXe siècle est en lien direct avec les évènements qui ont parsemé l'histoire...

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Abstract [H 7 O 3 ] 4 [Tc 20 O 68 ] ⋅ 4H 2 O [ 1 ] was prepared from an aqueous Tc 2 O 7 solution concentrated over anhydrous H 2 SO 4 . [Tc 20 O 68 ] 4− is the first polyanionic species to be reported for Tc. The unit cell contains one centrosymmetric [Tc 20 O 68 ] 4− polyanion as well as hydronium ions and water molecules. The core of the...

20 kHz sonication of amorphous and crystalline UO 3 powder in pure water under Ar/(10%)CO atmosphere yields intrinsic uranium( vi ) colloids exhibiting a schoepite-like crystallographic structure.

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Uranium is widespread in the environment, resulting both from natural occurrences and anthropogenic activities. Its toxicity is mainly chemical rather than radiological. In the blood it is transported as uranyl UO22+ cation and forms complexes with small ligands like carbonates and with some proteins. From there it reaches the skeleton, its...

Solubility, migration, and bioavailability of plutonium is lacunar because experimental evidences are missing. We report here on X-ray Absorption Spectroscopy of plutonium in natural seawater. The observed valence state is +IV and its speciation corresponds to PuO2 type colloids. Furthermore, aging of the solution shows a gradient of ordering...

The MARS beamline at the SOLEIL synchrotron is dedicated to the characterization of radioactive material samples. One great advantage of the beamline is the possibility to characterize about 380 radionuclides by different X-ray techniques in the same place. This facility is unique in Europe. A wide energy range from around 3.5 keV to 36 keV...

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