Implementation of an imaging spectrometer for localization and identification of radioactive sources

Hermine Lemaire 1 Khalil Amgarou 2 Roger Abou Khalil 2 Jean-Claude Angélique 3 Florent Bonnet 2 Daniel de Toro 2 Frédérick Carrel 1 Olivier Giarmana 2 Mehdi Gmar 4 Nabil Menaa 2 Yves Ménesguen 5 Stéphane Normand 1 Audrey Patoz 2 Vincent Schoepff 1 Philippe Talent 2 Tebug Timi 2
1 LCAE - Laboratoire Capteurs et Architectures Electroniques
DM2I - Département Métrologie Instrumentation & Information : DRT/LIST/DM2I
2 CANBERRA France
3 LPCC - Laboratoire de physique corpusculaire de Caen
4 DM2I - Département Métrologie Instrumentation & Information
5 LNHB - Laboratoire National Henri Becquerel
DM2I - Département Métrologie Instrumentation & Information : DRT/LIST/DM2I
Abstract : Spatial localization of radioactive sources is currently a main issue interesting nuclear industry as well as homeland security applications, and can be achieved using gamma cameras. For several years, CEA LIST has been designing a new system, called GAMPIX, with improved sensitivity, portability and ease of use. The main remaining limitation is the lack of spectrometric information, preventing radioactive materials identification. This article describes the development of an imaging spectrometer based on the GAMPIX technology. Experimental tests have been carried out according to both spectrometric methods enabled by the pixelated Timepix readout chip used in the GAMPIX gamma camera. The first method is based on the size of the impacts produced by a gamma-ray energy deposition in the detection matrix. The second one uses the Time over Threshold (ToT) mode of the Timepix chip and deals with time spent by pulses generated by charge preamplifiers over a user-specified threshold. Both energy resolution and sensitivity studies proved the superiority of the ToT approach that will consequently be further explored. Energy calibration, tests of several pixel sizes and use of the Medipix3 readout chip are tracks to improve performances of the newly implemented imaging spectrometer.
Keywords : Calibration imaging spectrometer Sensitivity Cameras Time over Threshold Timepix GAMPIX Gamma imaging Detectors Dispersion national security nuclear electronics preamplifiers radioactive sources readout electronics spectrometers imaging spectrometer implementation radioactive source localization radioactive source identification radioactive sources spatial localization nuclear industry homeland security applications CEA LIST system design spectrometric information limitation radioactive materials identification imaging spectrometer development GAMPIX technology experimental tests spectrometric methods pixelated Timepix readout chip GAMPIX gamma camera impact size gamma-ray energy deposition detection matrix time over threshold mode ToT mode pulse time spent charge preamplifiers user-specified threshold energy resolution energy sensitivity ToT approach superiority energy calibration pixel size tests Medipix3 readout chip newly implemented imaging spectrometer improve performances
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Hermine Lemaire, Khalil Amgarou, Roger Abou Khalil, Jean-Claude Angélique, Florent Bonnet, et al.. Implementation of an imaging spectrometer for localization and identification of radioactive sources. ANIMMA 2013 - Avancements in Nuclear Instrumentation Measurement Methods and their applications, Jun 2013, Marseille, France. pp.6727912, ⟨10.1109/ANIMMA.2013.6727912⟩. ⟨in2p3-00840026⟩

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