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De Pasquale, D.

Paper Title Page
THPMN022 Going Towards the Dual Energy X-Ray Radiographic System for Material Recognition Purposes 2754
  • U. Emanuele, U. Emanuele, A. Italiano
    INFN - Gruppo Messina, S. Agata, Messina
  • L. Auditore, R. C. Barna, D. De Pasquale, D. Loria, A. Trifiro, M. Trimarchi
    Universita di Messina, Messina
  Non Destructive Testing (NDT) has become the most used technique to inspect objects in order to find manufacturing defects (quality control), investigate contents (custom control), detect damages (structural control). However, the mono-energetic NDT can only discover a density variation in the analyzed sample but in most cases no hypothesis can be done on its composition; a complete inspection of an object would require the recognition of the material composing the analyzed sample and this can be achieved by means of the dual energy x-ray radiography. In this context, the INFN Gruppo Collegato di Messina is implementing the radio-tomographic system of the Universita di Messina, based on a 5 MeV electron linac, to the aim to provide dual energy x-ray beams for material recognition purposes. A wide study has been performed to provide different electron energies acting on the linac parameters. According to a theoretical study on the x-ray transmission for two properly chosen x-ray energies, preliminary tests have been performed to evaluate the complementarity of the images obtained with the dual energy technique. Work is still in progress to improve the dual energy system.  
THPMN023 Study of an Electron Linac Driven X-Ray Radio-Tomographic System Response as a Function of the Electron Beam Current 2757
  • L. Auditore, L. Auditore, R. C. Barna, D. De Pasquale, D. Loria, A. Trifiro, M. Trimarchi
    Universita di Messina, Messina
  • U. Emanuele, A. Italiano
    INFN - Gruppo Messina, S. Agata, Messina
  At the Dipartimento di Fisica, Universita di Messina, a high energy x-ray radio-tomography system driven by a 5 MeV electron linac, has been recently assembled. It has been tested and has already provided good results in inspecting heavy materials. In order to achieve good radiographic results, especially when inspecting heavy or thick materials, an enhancement of the x-ray dose at the sample position can be required and most of times this is associated to an enhancement of the grey level in the acquired image according to a linear function. Nevertheless, in the hypothesis to work at the maximum magnetron power, a variation of the x-ray dose, obtained changing the electron beam current, is associated to a variation of the electron beam energy. As a consequence, the x-ray energy spectrum varies thus influencing the response of the radio-tomographic system. This does not allow a linear correspondence between the x-ray fluence (or the electron beam current) and the image grey level. By means of MCNP-4C2 simulations, the influence of electron beam energy variations on the produced bremsstrahlung spectrum has been studied and the theoretical results have been experimentally confirmed.