Notícies
02.06.2020Publicat article: "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 Unitat de Microsonda Electrònica dels CCiTUB ha publicat l'article que porta per títol "Determination of Mass Attenuation Coefficients of Th, U, Np, and Pu for Oxygen Kα X-Rays Using an Electron Microprobe" a la revista Microscopy and Microanalysis. L'article, escrit en col·laboració amb el Dr. Philipp Pöml de la Comissió Europea (Joint Research Centre, Karlsruhe, Alemanya) està disponible en format open access. La publicació d'aquest article ha estat seleccionada en la secció "Highlights from Microscopy and Microanalysis" per la revista Microscopy Today (número Maig 2020).
El resum de l'article és el següent:
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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