XPS study of external α-radiolytic oxidation of UO2 in the presence of argon or hydrogen
Artikel i vetenskaplig tidskrift, 2021

UO2 pellets exposed to 1.85 MBq and 3.30 MBq Am-241 sources with a 30 μm separation in solution were studied under Ar and H2 atmospheres. The 1.85 MBq Am-241 source was shown to have a too low radiolytic production to cause any measurable change in UO2 surface oxidation state. However, a significant oxidation was observed after exposure to the 3.30 MBq source under Ar atmosphere through the production of U(V), as seen from the U4f7/2-peak deconvolution and valence band peak analysis. The H2 atmosphere was shown to suppress the oxidation of the UO2 pellet surface as well as the dissolution in both Milli-Q and NaHCO3 solutions. The dissolved uranium concentration was reduced by a factor 10 under H2 atmosphere as compared to the Ar atmosphere experiments.

oxidation

UO2

radiolysis

x-ray photoelectron spectroscopy

hydrogen effect

dissolution

Författare

Niklas Hansson

Chalmers, Kemi och kemiteknik, Energi och material, Kärnkemi

Eric Tam

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Christian Ekberg

Chalmers, Kemi och kemiteknik, Energi och material

Kastriot Spahiu

Svensk Kärnbränslehantering (SKB)

Chalmers, Kemi och kemiteknik, Energi och material, Kärnkemi

Journal of Nuclear Materials

0022-3115 (ISSN)

Vol. 543 152604

Ämneskategorier

Oorganisk kemi

Atom- och molekylfysik och optik

Metallurgi och metalliska material

Fundament

Grundläggande vetenskaper

Styrkeområden

Materialvetenskap

DOI

10.1016/j.jnucmat.2020.152604

Mer information

Senast uppdaterat

2021-01-14