Implementation of an imaging spectrometer for localization and identification of radioactive sources - IN2P3 - Institut national de physique nucléaire et de physique des particules
Conference Papers Year : 2013

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

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

Domains

Nuclear Experiment [nucl-ex] Instrumentation and Detectors [physics.ins-det] Signal and Image Processing Computational Physics [physics.comp-ph]
Fichier principal
Vignette du fichier
article_Hermine_Lemaire_GAMPIX_revised.pdf (681.87 Ko) Télécharger le fichier
Origin Files produced by the author(s)

Sandrine Guesnon  : Connect in order to contact the contributor

https://in2p3.hal.science/in2p3-00840026

Submitted on : Friday, May 3, 2019-8:35:05 AM

Last modification on : Wednesday, September 4, 2024-3:05:13 AM

Long-term archiving on : Wednesday, October 9, 2019-12:26:19 PM

Download

Dates and versions

in2p3-00840026 , version 1 (03-05-2019)

Identifiers

Cite

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⟩

Export

BibTeX XML-TEI Dublin Core DC Terms EndNote DataCite

Collections

IN2P3 CEA LPC-CAEN CNRS GRIFON COMUE-NORMANDIE DRT LIST ENSICAEN UNICAEN DM2I GS-SPORT-HUMAN-MOVEMENT DIN LPCC-MPBE
45 View
1 Download

Altmetric

Share

More