Abstract
A descriptive account is given of our most recent research on the actinide dioxides with the Advanced Light Source Molecular Environmental Science (ALS-MES) Beamline 11.0.2 soft X-ray scanning transmission X-ray microscope (STXM) at the Lawrence Berkeley National Laboratory (LBNL). The ALS-MES STXM permits near-edge X-ray absorption fine structure (NEXAFS) and imaging with 30-nm spatial resolution. The first STXM spectromicroscopy NEXAFS spectra at the actinide 4d5/2 edges of the imaged transuranic particles, NpO2 and PuO2, have been obtained. Radiation damage induced by the STXM was observed in the investigation of a mixed oxidation state particle (Np(V,VI)) and was minimized during collection of the actual spectra at the 4d5/2 edge of the Np(V,VI) solid. A plutonium elemental map was obtained from an irregular PuO2 particle with the dimensions of 650 × 650 nm. The Pu 4d5/2 NEXAFS spectra were collected at several different locations from the PuO2 particle and were identical. A representative oxygen K-edge spectrum from UO2 was collected and resembles the oxygen K-edge from the bulk material. The unique and current performance of the ALS-MES STXM at extremely low energies (ca. 100 eV) that may permit the successful measurement of the actinide 5d edge is documented. Finally, the potential of STXM as a tool for actinide investigations is briefly discussed.
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Acknowledgements
This research, the ALS, and ALS-MES BL-11.0.2 are supported by the Director, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences and Materials Sciences Division of the US Department of Energy at the Lawrence Berkeley National Laboratory under Contract No. DE-AC03-76SF00098. The work was also partially supported by the Swedish Nuclear Fuel and Waste Management Company, SKB AB. REW was supported in part by the Office of Civilian Radioactive Waste Management Fellowship Program administered by Oak Ridge Institute for Science and Education under a contract with the US Department of Energy and the Oak Ridge Associated Universities. The authors are grateful to Brian S. Fairchild of LBNL EH&S for his assistance in the performance of the actinide STXM experiments.
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Nilsson, H.J., Tyliszczak, T., Wilson, R.E. et al. Soft X-ray scanning transmission X-ray microscopy (STXM) of actinide particles. Anal Bioanal Chem 383, 41–47 (2005). https://doi.org/10.1007/s00216-005-3355-5
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DOI: https://doi.org/10.1007/s00216-005-3355-5