Papers by Antonio Brunetti
... Recent developments Tom Schoonjans, Antonio Brunetti, Bruno Golosio, Manuel Sanchez delRio, V... more ... Recent developments Tom Schoonjans, Antonio Brunetti, Bruno Golosio, Manuel Sanchez delRio, Vicente Armando Sol·e, Claudio Ferrero, Laszlo Vincze PII: S0584-8547(11)00198-4 DOI: doi: 10.1016/j.sab.2011.09.011 Reference: SAB 4316 To appear in: Spectrochimica ...
Journal of Applied Physics, 2003
Conventional x-ray transmission tomography provides the spatial distribution of the absorption co... more Conventional x-ray transmission tomography provides the spatial distribution of the absorption coefficient inside a sample. Other tomographic techniques, based on the detection of photons coming from fluorescent emission, Compton and Rayleigh scattering, are used for obtaining information on the internal elemental composition of the sample. However, the reconstruction problem for these techniques is generally much more difficult than that of transmission tomography, mainly due to self-absorption effects in the sample. In this article an approach to the reconstruction problem is presented, which integrates the information from the three types of signals. This method provides the quantitative spatial distribution of all elements that emit detectable fluorescent lines (Zу15 in usual experimental conditions͒, even when the absorption effects are strong, and the spatial distribution of the global density of the lighter elements. The use of this technique is demonstrated on the reconstruction of a grain of the martian meteorite NWA817, mainly composed of low Z elements not measured in fluorescence and for which this method provides a unique insight. The measurement was done at the ID22 beamline of the European Synchrotron Radiation Facility.
This work is part of a broader research line that aims to develop and implement a nondestructive ... more This work is part of a broader research line that aims to develop and implement a nondestructive methodology for the chemical characterization of archaeological metals based on a protocol that combines energy dispersive X-ray fluorescence spectrometry (ED-XRF) with a Monte Carlo (MC) simulation algorithm. In this paper, the ED-XRF/MC protocol has been applied to estimate the chemical composition of a selected group of 26 copper-based artifacts and fragments recovered at Perdigões, one of the larger Chalcolithic sites of Southwest Iberia. All the analyzed artifacts have a multilayered structure composed by the alloy substrate and by a superficial layer common in each metal buried for hundreds of years and consisting of the patina mixed with soil. Due to the difficulty in determining the quantitative composition of these alloys in the presence of this complex patina/encrustation layer, the spectrometric
Spectrochimica Acta Part B-atomic Spectroscopy, 2004
Synchrotron XRF imaging by Antonio Brunetti
JOURNAL OF APPLIED PHYSICS, 2003
Conventional x-ray transmission tomography provides the spatial distribution of the absorption co... more Conventional x-ray transmission tomography provides the spatial distribution of the absorption coefficient inside a sample. Other tomographic techniques, based on the detection of photons coming from fluorescent emission, Compton and Rayleigh scattering, are used for obtaining information on the internal elemental composition of the sample. However, the reconstruction problem for these techniques is generally much more difficult than that of transmission tomography, mainly due to self-absorption effects in the sample. In this article an approach to the reconstruction problem is presented, which integrates the information from the three types of signals. This method provides the quantitative spatial distribution of all elements that emit detectable fluorescent lines (Zу15 in usual experimental conditions͒, even when the absorption effects are strong, and the spatial distribution of the global density of the lighter elements. The use of this technique is demonstrated on the reconstruction of a grain of the martian meteorite NWA817, mainly composed of low Z elements not measured in fluorescence and for which this method provides a unique insight. The measurement was done at the ID22 beamline of the European Synchrotron Radiation Facility.
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Papers by Antonio Brunetti
Synchrotron XRF imaging by Antonio Brunetti