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Jorge Eduardo Fernandez

Associate Professor

Department of Industrial Engineering

Academic discipline: ING-IND/18 Nuclear Reactor Physics

Head of Alma Mater Studiorum Università di Bologna Representación en la Republica Argentina — Centro de Altos Estudios de la Universidad de Bologna


Keywords: radiation transport inverse problem x-ray spectrometry detector response function radiation detectors non-destructive techniques x and gamma ray dosimetry

Radiation transport modelling (using deterministic and Monte Carlo methods) of polarised and non-polarised photons, and charged and neutral particles Problems of multiple scattering. Coupled transport of photons and particles. Detailed representation of the detector influence and the pulse pile-up. Inverse problem. Applications to x- and gamma-ray spectroscopy (EDXRS, XANES, electron microprobe, tomography), to medical physics, to environmental physics, to industrial diagnostics, and to cultural heritage (non-destructive techniques).

The study of multiple scattering is important in x- and gamma-ray spectrometry. The contribute of only few scattering orders, computed deterministically by using the transport theory, allows the build-up of a theoretical spectrum which looks very close to the experimental one, favouring its interpretation. The Montecuccolino's research group has performed systematic studies of the multiple scattering contributions to the x-ray spectrum, which have lead to the development of a computer code to analyse experimental spectra (the code SHAPE) which includes all the deterministic solutions calculated with the scalar model. Recently, the transport model has been enriched with an analytical formulation which describes the polarisation state of the photons at every point of the phase space during the diffusion. This addition has permitted to study the influence of a source having an arbitrary polarisation state, and how this state will evolve as a consequence of the interactions undergone into the mean. Recent results have been the excellent agreement with spectra produced by linearly polarised sources like the synchrotron light. It has been developed a Monte Carlo code inspired on the vector transport model. It has been developed a 3-D version of the Monte Carlo code which has given its first results, recently. The validity of the transport model developed has been widely verified in the different application frameworks of x-ray spectrometry, specially in relation to the non destructive techniques using x-rays for the determination of some properties of the materials and in X-ray imaging and dosimetry.

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