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Voxel-based Monte Carlo simulation of x-ray imaging and spectroscopy experiments

Bottigli, Ubaldo and Brunetti, Antonio and Golosio, Bruno and Oliva, Piernicola and Stumbo, Simone and Vincze, Laszlo and Randaccio, Paolo and Bleuet, Pierre and Simionovici, Alexandre and Somogyi, Andrea (2004) Voxel-based Monte Carlo simulation of x-ray imaging and spectroscopy experiments. Spectrochimica Acta. Part B: Atomic Spectroscopy, Vol. 59 (10-11), p. 1747-1754. ISSN 0584-8547. Article.

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DOI: 10.1016/j.sab.2004.03.016


A Monte Carlo code for the simulation of X-ray imaging and spectroscopy experiments in heterogeneous samples is presented. The energy spectrum, polarization and profile of the incident beam can be defined so that X-ray tube systems as well as synchrotron sources can be simulated. The sample is modeled as a 3D regular grid. The chemical composition and density is given at each point of the grid. Photoelectric absorption, fluorescent emission, elastic and inelastic scattering are included in the simulation. The core of the simulation is a fast routine for the calculation of the path lengths of the photon trajectory intersections with the grid voxels. The voxel representation is particularly useful for samples that cannot be well described by a small set of polyhedra. This is the case of most naturally occurring samples. In such cases, voxel-based simulations are much less expensive in terms of computational cost than simulations on a polygonal representation. The efficient scheme used for calculating the path lengths in the voxels and the use of variance reduction techniques make the code suitable for the detailed simulation of complex experiments on generic samples in a relatively short time. Examples of applications to X-ray imaging and spectroscopy experiments are discussed.

Item Type:Article
ID Code:1945
Uncontrolled Keywords:Monte Carlo simulation, x-ray imaging, spectroscopy experiment
Subjects:Area 02 - Scienze fisiche > FIS/07 Fisica applicata (a beni culturali, ambientali, biologia e medicina)
Divisions:001 Università di Sassari > 03 Istituti > Matematica e fisica
Additional Information:Paper presented at the International congress on X-ray optics and microanalysis (ICXOM XVII), Chamonix, France, 22-26 September 2003.
Deposited On:18 Aug 2009 10:06

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