Abstract
This study aims at evaluating the capabilities of synchrotron radiation micro X-ray fluorescence spectrometry (SR micro-XRF) for qualitative and semi-quantitative elemental mapping of the distribution of actinides in human tissues originating from individuals with documented occupational exposure. The investigated lymph node tissues were provided by the United States Transuranium and Uranium Registries (USTUR) and were analyzed following appropriate sample pre-treatment. Semi-quantitative results were obtained via calibration by external standards and demonstrated that the uranium concentration level in the detected actinide hot spots reaches more than 100 μg/g. For the plutonium hot spots, concentration levels up to 31 μg/g were found. As illustrated by this case study on these unique samples, SR micro-XRF has a high potential for this type of elemental bio-imaging owing to its high sensitivity, high spatial resolution, and non-destructive character.
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Acknowledgments
The authors wish to thank the USTUR for providing the samples that were investigated in this study. The USTUR is funded by US Department of Energy, Office of Domestic and International Studies (AU-13), under grant award no. DE-HS0000073. Part of this research were carried out at the light source DORIS at DESY, a member of the Helmholtz Association (HGF) and the authors wish to thank DESY-Photon Science for granting this beamlime. Eva Vergucht acknowledges the Flemish Institute for the Promotion of Scientific and Technological Research in Industry (IWT, Flanders, Belgium) for her doctoral grant. Dr. Andrei Izmer and Dr. Björn De Samber acknowledge the Research Foundation Flanders (FWO, Flanders, Belgium) for their postdoctoral grants. The SR micro-XRF measurements were partially supported by the European Community’s Seventh Framework Programme (FP7/2007–2013) under grant agreement no. 312284. The authors also thank Leen Pieters for taking care of the sample preparation and Fanny Claverie (National Institute of Standards and Technology, NIST) for providing the standard reference material.
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Vergucht, E., De Samber, B., Izmer, A. et al. Study of the distribution of actinides in human tissues using synchrotron radiation micro X-ray fluorescence spectrometry. Anal Bioanal Chem 407, 1559–1566 (2015). https://doi.org/10.1007/s00216-014-8421-4
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DOI: https://doi.org/10.1007/s00216-014-8421-4