Développement de la méthode PIXE à haute énergie auprès du cyclotron ARRONAX

Abstract : Particle Induced X-ray Emission (PIXE) is a fast, nondestructive, multi-elemental analysis technique. It is based on the detection of characteristic X-rays due to the interaction of accelerated charged particles with matter. This method is successfully used in various application fields using low energy protons (energies around few MeV), reaching a limit of detection of the order the μg/g (ppm). At this low energy, the depth of analysis is limited. At the ARRONAX cyclotron, protons and alpha particles are delivered with energy up to 70 MeV, allowing the development of the High Energy PIXE technique. Thanks to these beams, we mainly produce KX-rays, more energetic than the LX-rays used with standard PIXE for the heavy elements analysis. Thus, in depth analysis in thick materials is achievable. For light element analysis, the PIGE technique, based on the detection of gamma rays emitted by excited nuclei, may be used in combination with PIXE. First of all, we will introduce the characteristics and principles of high energy PIXE analysis that we have developed at ARRONAX. Then we will detail the performance achieved, particularly in terms of detection limit in various experimental conditions. Finally, we present the results obtained for the analysis of multilayer samples and quantification of trace elements in thick samples.
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Diana El Hajjar Ragheb. Développement de la méthode PIXE à haute énergie auprès du cyclotron ARRONAX. Physique Nucléaire Théorique [nucl-th]. Ecole des Mines de Nantes, 2014. Français. ⟨NNT : 2014EMNA0137⟩. ⟨tel-01062444⟩

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