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PhD Thesis Student (m/f) Subject: New generation of crystalline film scintillators for X-ray imaging applications
The ESRF is a multinational research institute, situated in Grenoble, France and financed by 19 countries mostly European. It operates a powerful synchrotron X-ray source with some 30 beamlines (instruments) covering a wide range of scientific research in fields such as biology and medicine, chemistry, earth and environmental sciences, materials and surface science, and physics. The ESRF employs about 600 staff and is organized as a French société civile.
High-resolution X-ray imaging detectors based on thin converter screens suffer from low stopping power. The aim of the PhD position is to develop strategies to overcome the compromise between two antagonist parameters: high stopping power and high spatial resolution. A real breakthrough is expected from this work. Several approaches are proposed depending on the application. The first one is to propose new compositions having intrinsically higher stopping powers. The second one, based on an innovative concept, is to develop original multilayer structures able to increase the detection efficiency with energy-resolving capability of spectroscopy quality and without any decrease of the spatial resolution. For sub-micrometer resolution, 1mm to 50mm thin film are required and Single Crystal Film (SCF) scintillators can be obtained via Liquid Phase Epitaxy (LPE) in the LPE laboratory created at the ESRF.
The overall scope of this thesis is the development of new perovskite thin layer scintillators for high-resolution X-ray imaging. The project is subdivided in 4 tasks: Simulation, Material preparation, Characterization and imaging performances analysis. Modulation Transfer Function (MTF) simulations will be performed in order to select the best material/structure providing the best couple absorption-imaging contrast. Then a growth strategy will be set to optimise the scintillating films properties. Especially different material compositions will be engineered based on the K-edges of elements, to boost the efficiency of SCFs at particular X-ray energies. Finally a colour device will be developed by stacking layers based on different doping ions via the LPE method. The luminescence and optical properties of the scintillating films, as well as their X-ray imaging performances will be evaluated. To achieve this last task, optical spectroscopy under ionizing radiation will be achieve at the University Lyon1 and imaging tests will be done on the ESRF beamlines in real condition of X-ray imaging for high level research.
Place of Work: ESRF in Grenoble (France) as well University of Lyon (France)
Contract of two years renewable (subject to satisfactory progress) for one year.
The working language of the ESRF is English. You should hold a degree in Physics, materials science or Chemistry allowing enrolment for a PhD, such as an MSc, Master 2 de Recherche, Laurea or equivalent. For further information on employment terms and conditions, please refer to http://www.esrf.fr/Jobs/Conditions. The ESRF is an equal opportunity employer and encourages applications from disabled persons.