MARS, a New facility for X-ray diffraction and X-ray absorption for radioactive matter studies
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MARS, a New facility for X-ray diffraction and X-ray absorption for radioactive matter studies Sandrine Schlutig1, Pier Lorenzo Solari1, Hervé Hermange1 and Bruno Sitaud1 1 Synchrotron Soleil, L’Orme des Merisiers, Saint-Aubin, BP48, 91192 Gif-sur-Yvette, France. ABSTRACT The MARS (Multi-Analyses on Radioactive Samples) beamline, at Synchrotron Soleil (France) is fully dedicated to advanced structural and chemical characterizations of radioactive matter (solid or liquid), coupling analytical tools such as X-ray absorption spectroscopy, X-ray diffraction, X-ray fluorescence and associated micro-beam techniques. This beamline is now partially operational and has completed its first year of working with samples below exemption limits. This paper describes the beamline design and its technical specifications as well as the standard equipment of the experimental stations and the first obtained results. INTRODUCTION A large range of current technological and environmental issues require systematic investigation of the properties of radioactive samples by synchrotron radiation. Many of these fields are already the subject of on-going research using current synchrotron radiation beamlines. These studies have demonstrated the potential of synchrotron radiation to solve some physicochemical problems, but they have also emphasized the current need to carry out some experiments on highly activated samples. The Multi-Analyses on Radioactive Samples beamline (MARS), a hard X-ray beamline especially dedicated to radioactive matter research at Synchrotron Soleil, located near Paris, has been built to address these scientific needs. This beamline has been built thanks to a close partnership with the Commissariat à l’Energie Atomique (CEA). The aim was to be able to study a large variety of radioactive samples with activities up to 18.5 GBq per sample for α- and βemitters and 2 GBq for γ- and neutron emitters. The infrastructure of the MARS beamline is divided into four main areas: the optics hutch, the experimental hutch and the preparation/storage room, the ventilator and filters hutches and the main control room. The experimental hutch and the preparation/storage room are in a controlled area in compliance with the French legal safety requirements (multi-barrier safety concept, separate ventilation with HEPA filters, radiation monitoring) (for more details see [1]). The photon source used at the MARS beamline is a synchrotron light emitted from a bending magnet (D03-1) of the synchrotron SOLEIL electron storage ring (2.75 GeV and 500 mA). The design of the MARS optics allows work in two complementary configurations: the standard configuration (monochromatic beam) and the dispersive configuration (polychromatic beam with energy bandwith of 1000 eV). For details of the optics section of the MARS beamline design see [2]. This design provides for the monochromatic branch an energy range from 3.5 keV to 35 keV, a high photon flux, with an adjustable beam size and also a multi-technique beamline. The characteristics of the
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