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Dosimétrie électronique et métrologie neutrons par capteur CMOS a pixels actifs

Abstract : This work aims at demonstrating the possibility to use active pixel sensors as operational neutron dosemeters. To do so, the sensor that has been used has to be γ-transparent and to be able to detect neutrons on a wide energy range with a high detection efficiency. The response of the device, made of the CMOS sensor MIMOSA-5 and a converter in front of the sen-sor (polyethylen for fast neutron detection and 10B for thermal neutron detection), has been compared with Monte Carlo simulations carried out with MCNPX and GEANT4. These codes have been before-hand validated to check they can be used properly for our application. Experiments to characterize the sensor have been performed at IPHC and at IRSN/LMDN (Cadarache). The results of the sensor irradiation to photon sources and mixed field (241AmBe source) show the γ-transparency of the sensor by applying an appropriate threshold on the deposited energy (around 100 keV). The associated detection efficiency is satisfactory with a value of 10-3, in good agreement with MCNPX and GEANT4. Other features of the device have been tested with the same source, like the an-gular response. The last part of this work deals with the detection of thermal neutrons (eV-neutrons). Assays have been done in Cadarache (IRSN) with a 252Cf source moderated with heavy water (with and without cadmium shell). Results asserted a very high detection efficiency (up to 6×10-3 for a pure 10B converter) in good agreement with GEANT4.
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https://tel.archives-ouvertes.fr/tel-00630288
Contributor : Marie Vanstalle <>
Submitted on : Saturday, October 8, 2011 - 2:39:08 PM
Last modification on : Monday, August 31, 2020 - 10:58:02 AM
Long-term archiving on: : Sunday, December 4, 2016 - 7:10:43 PM

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  • HAL Id : tel-00630288, version 1

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Marie Vanstalle. Dosimétrie électronique et métrologie neutrons par capteur CMOS a pixels actifs. Physique Nucléaire Théorique [nucl-th]. Université de Strasbourg, 2011. Français. ⟨tel-00630288⟩

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