Noticias
02.06.2020Publicado el artículo: "Determination of Mass Attenuation Coefficients of Th, U, Np, and Pu for Oxygen Kα X-Rays Using an Electron Microprobe"
El Dr. Xavier Llovet, responsable de la Unidad de Microsonda Electrónica de los CCiTUB ha publicado el artículo que lleva por título "Determination of Mass Attenuation Coefficients of Th, U, Np, and Pu for Oxygen Kα X-Rays Using an Electron Microprobe" en la revista Microscopy and Microanalysis. El artículo, escrito en colaboración con el Dr. Philipp Pöml de la Comisión Europea (Joint Research Centre, Karlsruhe, Alemania) está disponible en formato open access. La publicación de este artículo ha sido seleccionada en la sección "Highlights from Microscopy and Microanalysis" por la revista Microscopy Today (número Mayo 2020).
El resumen del artículo es el siguiente:
Mass attenuation coefficients (MACs) of Th, U, Np, and Pu for oxygen X-rays have been experimentally determined using an electron microprobe. The MACs were obtained by measuring relative X-ray intensities emitted from ThO2, UO2, NpO2, and PuO2 targets, for incident electron energies from 5 to 30 keV, and processing them with the help of the computer program XMAC. The accuracy of the measured MACs is estimated to be better than 5%. Results are compared with MAC tabulations commonly used in electron probe microanalysis as well as with theoretical photoionization calculations. It is concluded that the MACs implemented in the Monte Carlo simulation program PENELOPE which are based on the photoionization cross-section calculations of Sabbatucci & Salvat [(2016). Theory and calculation of the atomic photoeffect. Rad Phys Chem121, 122–140], provide the best agreement with our measurements. The use of different MAC schemes for the analysis of mixed actinide oxide materials is discussed.
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