JRP CALL information
Supported By

European Commission

Short description of the work
Polished block sections of two different geological samples that had been exposed to Np(V) containing synthetic cement leachate (pH 10.5) at the KIT-INE-Laboratories were analysed using µ-XAS and µ-XRF techniques at the ANKA INE-Beamline to determine the Np speciation and preferential mineral associations with the heterogeneous geological materials. Each specimen was mounted within a Perspex block and sealed with two independent layers of kapton to provide x-ray transparent containment of the neptunium. A series of line scans were obtained at 18 keV (above the Np L(III)-edge) to build fluorescence maps at several points of interest, identified from prior autoradiography analysis of the samples. Processing of the total fluorescence intensity map allowed elemental identification and quantification thus enabling elemental distributions and associations in the mapped area to be deduced. At each point of interest, Np L(III)-edge µ-focus XANES or EXAFS were also collected to provide information on Np speciation and bonding environment.

Main visitor contact data
Name: Tim Marshall
Organisation: The University of Manchester

JRP Identification
JRP nr: TALI-C02-13
JRP title: Application of synchrotron μ‐focus techniques to Np(V) uptake by geological materials
JRP scope: Scope 2: Actinide in the geological environment

Visited Associated Pooled Facility
Visited APF during the stay: KIT-INE - Beamline
Name of the APF Contact Person: PD Dr. habil.Thorsten Schaefer

Other APF and organisation involved in the JRP
Other organisations involved: None
Other APF involved in the project: KIT-INE - Laboratories

Description of the work done at the associated pooled facility
Start date of the stay: 7/1/2014
End date of the stay: 7/5/2014
Quantity of access: 3
Access Unit: Days
Misc.: Work during week-ends

Other APF visitors of the JRP during the stay
Visitor 2: Dr Gareth Law (The University of Manchester)
Visitor 3: Josh Weatherill (The University of Manchester)
Visitor 4:
Visitor 5: