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Np M₅-edge HR-XANES and L₃-edge EXAFS spectroscopy on illite samples with 20 - 140 ppm Np

Schacherl, B. ORCID iD icon; Joseph, C.; Lavrova, P.; Beck, A.; Schnurr, A.; Rieder, F.; Dardenne, K. ORCID iD icon; Fellhauer, D.; Kupcik, T.; Rothe, J. ORCID iD icon; Geckeis, H.; Vitova, T. ORCID iD icon

Abstract (englisch):

A deep geological disposal with a multi-barrier system is proposed, to safely isolate the
high-level radioactive waste from the biosphere. Clays are considered as potential host rock
and as potential backfill material. This study is focused on understanding the interaction
between illite, a clay mineral present in several clay host rocks, and Np-237, a radionuclide
presenting a considerable fraction in high-level waste. Np is a redox-sensitive element with
pentavalent Np being stable in oxidizing to redox-neutral environment and tetravalent Np
prevailing under reducing conditions. To understand the mechanism of Np retention, it is
necessary to understand the sorption but also the migration behaviour.
This investigation probes the redox-species and the atomic environment of Np sorbed onto
illite for samples from batch sorption and diffusion experiments applying different
spectroscopic and microscopic techniques (Np M5-edge high-energy resolution X-ray
absorption near edge structure (HR-XANES) [1], Np L3-edge extended X-ray absorption fine
structure (EXAFS), Fe K-edge XANES, and Mössbauer spectroscopy as well as scanning
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Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Poster
Publikationsjahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000104845
HGF-Programm 32.01.04 (POF III, LK 01) Entw.u.Anpassung v.Speziationsmethoden
Weitere HGF-Programme 54.01.01 (POF III, LK 01) ps- und fs-Strahlen
Veranstaltung EBS workshop on X-ray Emission Spectroscopy (2019), Grenoble, Frankreich, 03.12.2019 – 05.12.2019
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