JRP CALL information
Supported By

European Commission

Short description of the work
X-ray fluorescence (XRF), X-ray diffraction (XRD) and X-ray absorption spectroscopic (XAS) measurements have been performed on single and agglomerates of micrometer sized uranium particles at the MicroXAS beamline (PSI, Villigen, Switzerland) in order to determine the physio chemical properties.
Monodisperse microspheres were produced at Forschungszentrum Juelich GmbH by spray pyrolysis with sintering temperatures ranging from 400 °C to 593 °C using uranyl nitrate and uranyl acetate precursor solutions. These microspheres are intended to be used as (certified) reference materials with respect to the isotopic composition and uranium content. As the stability of these property values is of high importance, structural information about the microspheres is required. The different microspheres have been investigated to determine the optimal production route to obtain stable microspheres.
XRF measurements confirmed the presence of uranium and provided auxiliary assurance that the particles do not contain significant impurities. XRD measurements showed for all these microspheres an orthorhombic phase similar to U3O8 and XANES measurements confirmed the presence of U3O8. It can be derived that the microsphere production using an uranyl nitrate precursor solution and sintered at 500 °C yielded in results with consistent and desired quality, although an unexpected behavior compared to literature data for bulk materials was observed.

Main visitor contact data
Name: Alexander Knott
Organisation: Forschungszentrum Juelich GmbH and International Atomic Energy Agency

JRP Identification
JRP nr: TALI-C06-08
JRP title: Investigations of the physio chemical and structural properties of monodisperse uranium particles for Nuclear Safeguards Applications
JRP scope: Scope 3: Actinide materials

Visited Associated Pooled Facility
Visited APF during the stay: PSI - MicroXAS Beamline
Name of the APF Contact Person: Dr. Daniel Grolimund

Other APF and organisation involved in the JRP
Other organisations involved: Forschungszentrum Juelich GmbH (Ronald Middendorp); Forschungszentrum Juelich GmbH (Martin Duerr); International Atomic Energy Agency (Ernesto Chinea-Cano); International Atomic Energy Agency (Darek Wegrzynek)
Other APF involved in the project:

Description of the work done at the associated pooled facility
Start date of the stay: 10/9/2015
End date of the stay: 10/12/2015
Quantity of access: 3
Access Unit: Days
Misc.: Work during week-ends

Other APF visitors of the JRP during the stay
Visitor 2: Ronald Middendorp (FZJ)