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Un nouveau système d’imagerie gamma portable dédié à la détection et à la visualisation des points chauds dans les centrales nucléaires

Abstract : A new portable gamma imaging system dedicated to the detection and the direct visualisation of hot spots in nuclear power plants. In a nuclear power plant (NPP), the localization of radioactive hot spots is a major issue, as they are responsible for a significant part of the doses received by the workers, especially during maintenance operations. Since 2010, EDF and CEA have been adapting a new generation caméra gamma, GAMPIX, to have a dedicated portable tool available for this use. This system enables to superimpose a gamma image with a visible image, in order to locate radioactive sources in a given area. Onsite measurements at the Tricastin EDF NPP, combined with specific developments at CEA, have been carried out in order to meet the particular environmental and radiological conditions experienced in such industrial facilities: the relatively high energy of cobalt-60 (1.17 and 1.33 MeV) and the existence of an ubiquitous background. This article will present the specifications required, the corresponding improvements and the main results obtained during the on-site measurements campaigns. Even if they were dedicated to the qualification of the camera, the tests carried out showed useful results like the leakage lines along a lead protection and the displacement of a hot spot in a pipe (compared to its identified position). At the end, further developments are presented.
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E. Gaillard-Lecanu, D. Hameau, H. Onillon, S. Jahan, Vincent Schoepff, et al.. Un nouveau système d’imagerie gamma portable dédié à la détection et à la visualisation des points chauds dans les centrales nucléaires. Radioprotection, EDP Sciences, 2013, 48 (4), pp.471 - 492. ⟨10.1051/radiopro/2013069⟩. ⟨cea-01792043⟩

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