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Highly resolved synchrotron-based investigations related to nuclear waste disposal

  • Melissa A. Denecke (a1), Manuela Borchert (a2), Robert G. Denning (a3), Wout de Nolf (a4), Gerald Falkenberg (a2), Susanne Hönig (a5), Martina Klinkenberg (a6), Kristina Kvashnina (a7), Stefan Neumeier (a6), Jens Patommel (a5), Tobias Petersmann (a8), Tim Pruessmann (a1), Stephan Ritter (a5), Christian G. Schroer (a5), Sandra Stephan (a5), Julie Villanova (a7), Tonya Vitova (a1) and Gerd Wellenreuther (a2)...

Abstract

Synchrotron-based X-ray techniques are used increasingly to characterize actinide element speciation in heterogeneous media related to nuclear waste disposal safety. Especially techniques offering added temporal, spatial and energy resolved information are advancing our understanding of f-element physics and chemistry in general and of actinide element waste disposal in particular. Examples of investigations of uranium containing systems using both highly (energy) resolved X-ray emission spectroscopy (HRXES) techniques and spatially resolved techniques with focused X-ray beams are presented in this paper: polarization dependent partial fluorescence yield X-ray absorption near edge structure (PD-PFY-XANES) spectroscopic studies of a single Cs2UO2Cl4 crystal, which experimentally reveal a splitting of the σ, π, and δ components of the 6d valence states [1], and characterization of UO2/Mo thin films prepared on different substrates using a combination of techniques (2D and 3D micro- and nano-X-ray fluorescence, XANES and both holographic and ptychographic tomography).

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