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4 results on '"CEA LIST"'

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

Author

Olivier Giarmana, Audrey Patoz, Daniel De Toro, Stephane Normand, Yves Menesguen, Philippe Talent, N. Menaa, Jean-Claude Angelique, Hermine Lemaire, Mehdi Gmar, Tebug Timi, Roger Abou Khalil, Florent Bonnet, Frederick Carrel, K. Amgarou, Vincent Schoepff, Laboratoire Capteurs et Architectures Electroniques (LCAE), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Université Paris-Saclay-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CANBERRA France, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire National Henri Becquerel (LNHB), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département d'instrumentation Numérique (DIN (CEA-LIST))

Subjects
Time over Threshold, energy resolution, Imaging spectrometer, readout electronics, nuclear industry, homeland security applications, impact size, detection matrix, 01 natural sciences, 7. Clean energy, nuclear electronics, 030218 nuclear medicine & medical imaging, law.invention, Sensitivity, pixel size tests, 0302 clinical medicine, [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, law, GAMPIX technology, energy sensitivity, Instrumentation, Gamma camera, CALIBRATION, Physics, preamplifiers, spectrometers, radioactive sources, Detector, imaging spectrometer development, PIXEL DETECTOR, Detectors, Dispersion, Cameras, Chip, GAMPIX gamma camera, TIME, pulse time spent, GAMMA-CAMERA, user-specified threshold, imaging spectrometer implementation, national security, Computer hardware, system design, Nuclear and High Energy Physics, Medipix3 readout chip, GAMPIX, spectrometric information limitation, Preamplifier, energy calibration, Gamma imaging, radioactive materials identification, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.PHYS.PHYS-COMP-PH]Physics [physics]/Physics [physics]/Computational Physics [physics.comp-ph], 03 medical and health sciences, Software portability, Timepix, Nuclear electronics, 0103 physical sciences, radioactive source localization, Calibration, ToT approach superiority, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, gamma-ray energy deposition, pixelated Timepix readout chip, Spectrometer, Pixel, 010308 nuclear & particles physics, business.industry, ToT mode, experimental tests, time over threshold mode, radioactive source identification, radioactive sources spatial localization, spectrometric methods, charge preamplifiers, RESOLUTION, newly implemented imaging spectrometer improve performances, CEA LIST, business, Energy (signal processing)
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 of this system is the lack of spectrometric information, preventing the identification of radioactive materials. 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 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 demonstrated the superiority of the ToT approach which will consequently be further explored. Energy calibration, tests of different pixel sizes for the Timepix chip and use of the Medipix3 chip are future milestones to improve performances of the newly implemented imaging spectrometer.

Published
2014

2. Implementation of gadolinium for neutron measurement systems based on plastic scintillators and semiconductors

Author

G.H.V. Bertrand, Karim Boudergui, R. Coulon, Matthieu Hamel, Jonathan Dumazert, Frederick Carrel, V. Kondrasovs, Laboratoire Capteurs et Architectures Electroniques (LCAE), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))

Subjects
semiconductor counters, medicine.medical_specialty, gadolinium converters, Materials science, Physics::Instrumentation and Detectors, Gadolinium, Astrophysics::High Energy Astrophysical Phenomena, chemistry.chemical_element, semiconductors, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, neutron detection, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, 0103 physical sciences, medicine, Neutron detection, Medical physics, gamma-ray detection, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], plastic scintillators, Neutron measurement, Diode, 010308 nuclear & particles physics, business.industry, Gamma ray, prompt gamma ray signature, Signature (logic), Gd-doped plastic scintillator, solid scintillation detectors, neutron measurement systems, Semiconductor, chemistry, large spherical scintillators, CEA LIST, Optoelectronics, business, compensated CdZnTe diodes
Abstract

International audience; CEA LIST has investigated different schemes enabling neutron detection thanks to the implementation of gadolinium converters. The fine analysis of the prompt gamma ray signature has permitted us to propose and test dedicated designs such as Gd-doped plastic scintillator, large spherical scintillators or compensated CdZnTe diodes.

Published
2016

3. Qualitative and quantitative validation of the SINBAD code on complex HPGe gamma-ray spectra

Author

Eric Barat, C. Jammes, Frederick Carrel, Thomas Dautremer, Stéphane Normand, R. Coulon, T. Montagu, Emmanuel Rohee, Laboratoire Capteurs et Architectures Electroniques (LCAE), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Modélisation et Simulation de Systèmes (LM2S), Département Etude des Réacteurs (DER), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))

Subjects
innovative approach SINBAD code, Computer science, peak centroid estimation, Deconvolution, 7. Clean energy, 01 natural sciences, user-friendly SINBAD operation, high resolution gamma-ray spectrometry, fitting method, 010104 statistics & probability, nonparametric Bayesian inference, [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, Gamma spectroscopy, identification step, full energy peaks, radionuclide quantification, Detector, HPGe detectors, Gamma ray, Detectors, conventional analysis method, Bayes methods, Compton background, Semiconductor detector, nuclear power plant security, complex HPGe gamma-ray spectra, radionuclide identification, gamma spectra analysis software benchmark, Gamma-rays, Algorithm, fitting procedures, [STAT.ME]Statistics [stat]/Methodology [stat.ME], gamma spectra analysis, [MATH.MATH-NA]Mathematics [math]/Numerical Analysis [math.NA], nuclide detection, germanium radiation detectors, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], quantification step, Nuclear physics, single peak signal, spectrum data, Nuclide, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 0101 mathematics, expert parameter cost, qualitative validation, nonparametric SINBAD approach, radioisotopes, waste measurements, International Atomic Energy Agency, CBRN risk identification, Genie 2000, Centroid, fuel cycle facility, nuclear power plant safety, quantitative validation, gamma-ray spectroscopy, 13. Climate action, gamma-ray energies, unfolding complex spectra, CEA LIST, Fitting, high full energy peak intensity differences, hard deconvolutions, Estimation, environmental radioprotection, Energy (signal processing), fission reactor safety, Software
Abstract

Conference of 4th International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications, ANIMMA 2015 ; Conference Code:121554; International audience; Radionuclide identification and quantification is a serious concern for many applications as safety or security of nuclear power plant or fuel cycle facility, CBRN risk identification, environmental radioprotection and waste measurements. High resolution gamma-ray spectrometry based on HPGe detectors is a performing solution for all these topics. During last decades, a great number of software has been developed to improve gamma spectra analysis. However, some difficulties remain in the analysis when full energy peaks are folded together with a high ratio between their amplitudes, when the Compton background is much larger compared to the signal of a single peak and when spectra are composed of a great number of peaks. This study deals with the comparison between a conventional analysis method and an innovative approach, called SINBAD ("Spectrométrie par Inférence Non paramétrique BAyesienne Déconvolutive"), for radionuclide identification and quantification. For many years, SINBAD has been developed by the CEA LIST for unfolding complex spectra from HPGe detectors. Contrary to the conventional method using fitting procedures, SINBAD uses a probabilistic approach with nonparametric Bayesian inference to process spectrum data. The conventional fitting method founded for instance in Genie 2000 is compared with the nonparametric SINBAD approach regarding some key figures of merit as the peak centroid estimation (identification step) and net peak area determination (quantification step). Complex cases are studied for nuclide detection with closed gamma-rays energies and high full energy peak intensity differences. Tests are performed with spectra from the International Atomic Energy Agency (IAEA) for gamma spectra analysis software benchmark and with spectra acquired in our laboratory. It appears that SINBAD results are better than GENIE 2000 ones in most of the cases even if hard deconvolutions can be achieved thanks to GENIE 2000 at the cost of expert parameters fine tuning which has to be compared with the user-friendly SINBAD operating.

Published
2015

4. Intracavitary in vivo dosimetry based on multichannel fiber-coupled Radioluminescence and Optically Stimulated Luminescence of Al$_2$O$_3$ :C

Author

Spasic, Estelle, Magne, Sylvain, Aubineau-Lanièce, Isabelle, De Carlan, Loïc, Malet, C., Ginestet, C., Ferdinand, Pierre, Laboratoire Capteurs Fibres Optiques (LCFO), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire National Henri Becquerel (LNHB), Centre Léon Bérard [Lyon], The European MAESTRO Project (FP6-CE503564), IEEE, ANR-09-ETEC-0003,INTRADOSE,Dosimétrie OSL in vivo intracavitaire pour le suivi en ligne et en temps réel des traitements par Curiethérapie et Radiothérapie externe(2009), European Project: 26861,MAESTRO, Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département d'instrumentation Numérique (DIN (CEA-LIST)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
FODC Monte Carlo modeling, hexagonal PMMA fiber bundle, brachytherapy, Radiation effects, dual fiber subtraction method, Optical fiber cables, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Crystals, fiber optic dosimetric catheters, Cerenkov radiation, iridium sources, multichannel fiber coupled RL-OSL, Optical fibers, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], IMRT, carbon doped alumina, Al2O3:C, planned dose distribution, source-sensor distance, linear accelerators, spontaneously emitted radioluminescence, OSL signals, ANR-INTRADOSE Project, Optical fiber sensors, real time dose measurements, intracavitary in vivo dosimetry, intensity modulated radiation therapy, Photonics, stem effect influence, scintillation radiation, CEA LIST, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, [PHYS.PHYS.PHYS-MED-PH]Physics [physics]/Physics [physics]/Medical Physics [physics.med-ph], optically stimulated luminescence, alumina crystals
Abstract

International audience; Fiber Optic Dosimetric Catheters (FODCs) composed of chains of alumina crystals are investigated by the CEA LIST within the French ANR-INTRADOSE Project in the purpose of intracavitary in vivo dosimetry (IVD) during Brachytherapy (BT) with iridium sources and Intensity-Modulated Radiation Therapy (IMRT) with linear accelerators. A dedicated process involving PMMA fibers, casted altogether forming hexagonal bundle, is demonstrated. Optically Stimulated Luminescence (OSL) signals are recorded on-line after irradiation and absorbed doses are compared to planned dose distribution. Real-time dose measurements may also be performed by recording the RadioLuminescence (RL), spontaneously emitted by the crystals during irradiation. In this case, a correction method is implemented to correct for stem effect influence (Cerenkov and scintillation generated within the fibers). For BT, the dual-fiber subtraction method is used (using a reference fiber) whereas the time discrimination method is used for IMRT. The experimental dose distribution leads to an underestimation of the source-sensor distance presumably due to energy dependence of the alumina crystal at low photon energy. At the time being, Monte-Carlo modeling of the FODC is performed with the aim to estimate this energy dependence and finally correct for it. Finally, metrological and preclinical validations are still running at Centre Léon Bérard (Lyon, France) in the purpose of checking the compliance of the FODC prototypes with treatment specifications and medical constraints.

Published
2009

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