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Nondestructive Spectrometric Study on a Radioactive Particle Embedded in a Marine Sediment

Published online by Cambridge University Press:  04 July 2008

Marek Bielewski ,
Jerome Himbert ,
Nedialka Niagolova ,
Gerald Falkenberg ,
Mats Eriksson  and
Maria Betti
Marek Bielewski*
Affiliation:
European Commission—DG JRC, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
Jerome Himbert
Affiliation:
European Commission—DG JRC, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
Nedialka Niagolova
Affiliation:
European Commission—DG JRC, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
Gerald Falkenberg
Affiliation:
HASYLAB, DESY, Notkestrasse 85, D-22607 Hamburg, Germany
Mats Eriksson
Affiliation:
IAEA-MEL, 4 Quai Antoine 1er, MC 98000, Monaco
Maria Betti
Affiliation:
European Commission—DG JRC, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
*
Corresponding author. E-mail: marek.bielewski@ec.europa.eu
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Abstract

A radioactive particle embedded in a sediment collected from the Irish Sea was examined with spectrometric methods to understand the potential bioavailability of its constituents. Images of the particle surface were acquired in the backscattering mode by scanning electron microscopy. The elemental composition of the particle surface layer was measured using energy dispersive (SEM-EDX) and wavelength dispersive (SEM-WDX) X-ray spectrometers. The investigation showed that the sample consists of a calcite matrix in which uranium is present in the form of separate inclusions. The diameter of U inclusions was less than 10 μm. Synchrotron radiation based X-ray fluorescence in confocal geometry (confocal μ-XRF) was used to determine the spatial distribution of elements in the particle. Three-dimensional reconstructions of the Ca, Cr, Mn, Fe, Zn, Sr, Ba, Pb, and U distributions were performed. The oxidation state of uranium in the different inclusions was determined by synchrotron radiation based X-ray absorption in confocal geometry (confocal μ-XANES). The isotopic composition of uranium was measured by secondary ion mass spectrometry. The results revealed that uranium was depleted in 235U. Pu and other actinides were not detected.

Keywords

radioactivesedimentparticleXRFXANESSEMSIMSelemental analysissynchrotron radiationconfocal
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 14 , Issue 4 , August 2008 , pp. 321 - 327
Copyright
Copyright © Microscopy Society of America 2008

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