Publications

New fluoride target matrix preparation procedure for determination of <sup>236</sup>U with accelerator mass spectrometry

Author(s)
T. Prášek, M. Němec, P. Steier, M. Kern, M. Honda, K. Hain, X. Zhang
Abstract

In recent years, radionuclide 236U has become a valuable analytical tool covering a wide area of applications, including overall monitoring of environmental radioactive contamination for nuclear safeguards purposes, forensic analyses, tracing of various natural processes, e.g. ocean currents, soil erosion and others. Due to low concentrations of 236U in environmental samples, highly sensitive mass spectrometric methods as ICP-MS and AMS require to be applied in related analyses. AMS measurements usually utilize target samples with uranium converted to a form of oxide incorporated in iron(III) oxide (Fe2O3) carrier matrix. Alternatively, fluoride target matrices, uranium tetrafluoride (UF4) in particular, have been studied as a promising alternative, providing significantly higher ion currents at a simultaneous reduction of occurring interferences by replacement of oxygen with monoisotopic fluorine 19F. Despite these advantages, application of fluoride target matrices in routine analytical process still faces several major problems regarding the preparation of pure, anhydrous uranium tetrafluoride as well as the continuity of preparation procedures with preceding sample treatment, which demand further modifications. In this respect, a new fluoride target matrix preparation method has been proposed, more suitable for determination of 236U in natural samples. Applicability of the procedure has been demonstrated on a series of target samples analysed at VERA AMS laboratory, University of Vienna.

Organisation(s)
Isotope Physics
External organisation(s)
Czech Technical University in Prague (CTU), Universität Wien
Journal
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume
472
Pages
64-71
No. of pages
8
ISSN
0168-583X
DOI
https://doi.org/10.1016/j.nimb.2020.03.029
Publication date
06-2020
Peer reviewed
Yes
Austrian Fields of Science 2012
103014 Nuclear physics, 105904 Environmental research
Keywords
ASJC Scopus subject areas
Nuclear and High Energy Physics, Instrumentation
Portal url
https://ucris.univie.ac.at/portal/en/publications/new-fluoride-target-matrix-preparation-procedure-for-determination-of-236u-with-accelerator-mass-spectrometry(707c00b7-f290-447c-b5cc-652ea09743e3).html