A5062133249- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Graphite, nuclear technology, radiation studies
- Nuclear and radioactivity studies
- Radioactive contamination and transfer
- Luminescence Properties of Advanced Materials
- Robotics and Sensor-Based Localization
- Distributed Sensor Networks and Detection Algorithms
- Atomic and Subatomic Physics Research
- 3D Surveying and Cultural Heritage
- Risk and Safety Analysis
- Particle Detector Development and Performance
- Fault Detection and Control Systems
- Quantum optics and atomic interactions
- Mechanical and Optical Resonators
- Analytical Chemistry and Sensors
- Radioactivity and Radon Measurements
- Probabilistic and Robust Engineering Design
- Indoor and Outdoor Localization Technologies
- Risk Perception and Management
- bioluminescence and chemiluminescence research
- Advanced Semiconductor Detectors and Materials
- Air Quality Monitoring and Forecasting
- Geological Modeling and Analysis
Université Paris-Saclay
2020-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2009-2024
CEA LIST
2009-2024
Integra (United States)
2010
Simultaneous localization and mapping (SLAM) techniques are widely researched, since they allow the simultaneous creation of a map sensors’ pose estimation in an unknown environment. Visual-based SLAM play significant role this field, as based on low-cost small sensor system, which guarantees those advantages compared to other sensor-based techniques. The literature presents different approaches methods implement visual-based systems. Among variety publications, beginner domain may find...
This paper aims to give an overview of very recent European coordinate efforts implement technologies the “4.0 Industry” in nuclear deconstruction sector. objective benefit from lever efficiency and reliability represented by innovative on all value chain dismantling, early characterization dismantling operations themselves through engineering studies, waste management, project management coordination multiple stakeholders each project. The outcomes five projects (INNO4GRAPH, LD-SAFE,...
The Timepix3 hybrid-pixel readout chip consists of a matrix made 256 × square-shaped pixels with 55-μm pitch, which can be hybridized to several semiconductors, such as silicon (Si) or cadmium telluride (CdTe) thicknesses up 5 mm. Working an event-based chip, it simultaneously records the time-over-threshold (ToT) in each pixel, measuring deposited energy, well time-of-arrival (ToA), time resolution 1.5 ns. In this article, we present energy calibration two chips: first one was bump-bonded...
Establishing an accurate radiological mapping is essential step for the Dismantling & Decommissioning (D&D) processes since it allows localization of possible hotspots. Nowadays, this work usually done manually by operators who construct matrices and place each measured value in its respective position. However, method presents many drawbacks, leading literature to increasingly explore alternative solutions, such as combining measurements with Simultaneous Localization Mapping techniques...
Accurate detection of low-level radioactivity is critical for decommissioning projects in nuclear facilities, particularly the design radiation monitoring systems with a low false alarm rate. Utilizing non-parametric Bayesian continuous probability distribution enables reliable mapping potential contamination. Our method introduces statistical test based on Pólya tree prior, applied to detection. The efficiency this proposed quantified using receiver-operating characteristic (ROC) curves and...
Few data exist regarding the yields and time spectra of delayed neutrons from photofission reaction on actinides. In this paper, we report characteristics both six-group eight-group neutron models for 238 U induced by a Bremsstrahlung photon spectrum with an end-point energy at 9 MeV. This study was conducted using MeV linear electron accelerator housed SAPHIR platform located CEA Paris-Saclay, France. A reference sample depleted uranium positioned inside detection block, previously designed...
Human intervention is still required nowadays for most operations conducted during the Dismantling & Decommissioning (D&D) steps, which cover a wide range of radiological conditions: from harsh initial conditions, nearly identical to when operating, final decommissioning steps where radioactivity has been removed. The goal three years EU-funded CLEANDEM project, led by CEA List, deliver unique platform will support end-users’ operations, assessment characterization facility, while...
In this article, we aim at measuring a low-activity uranium contamination deposited on concrete surfaces of nuclear facility and presenting varying enrichment levels. Considering application field, CEA LIST, has developed an original approach, combining gamma-ray spectrometry based high-purity germanium (HPGe) measurements specific Bayesian algorithms. This methodology gives access to indirect surface activity estimation, assuming that the ratio between number alpha particles be quantified...
This work deals with the use of gamma spectrometry for fourth generation Sodium Fast Reactor (SFR) power monitoring and clad failure detection. Usually, spectrometers could not manage on-line applications in high count rate fast activity variations but recent improvements this research field may improve it. The ADONIS analyser met two needs SFR. ex-core neutron measurement gives instant estimation has some shift problems, mainly due to burn-up phenomenon. High security margins are then set...
Polymer-based scintillators present interesting features for the field of ionizing radiation detection, related to high sensitivity fluorescence techniques coupled manufacturing advantages such materials. Organic materials can indeed be manufactured into large sensing areas with different geometrical conformations through low-cost fabrication techniques. While results herein presented focus on liquids, same phenomena would occur in solid samples. Widely used applications because its...
It is shown that lasing can be achieved in commercial organic liquid scintillators. Using a dynamic grating induced by an interference pattern the scintillator volume, distributed feedback to occur four out of five scintillators have been investigated. Although these are not designed for application, their purpose being measure radioactivity, induction laser effect, furthermore with tuning range approximately 30 nm, has attained.
Reliability on simulation results is essential in nuclear physics. Although MCNP5 and MCNPX are the world widely used 3D Monte Carlo radiation transport codes, alternative tools exist to simulate neutral charged particles' interactions with matter. Therefore, bench- mark required order validate these codes. For instance, TRIPOLI-4.7, developed at French Alternative Energies Atomic Energy Commission for neutron photon transport, now also provides user a full feature electron-photon...
Polymer-based scintillators present interesting features for the field of ionizing radiation detection, related to high sensitivity fluorescence techniques coupled manufacturing advantages such materials. Organic materials can indeed be manufactured into large sensing areas with different geometrical conformations through low-cost fabrication techniques. While results herein presented focus on liquids, same phenomena would occur in solid samples. Widely used applications because its...
Amongst the various technical challenges in field of radiation detection is need to carry out accurate low-level radioactivity measurements presence large fluctuations natural background, while lowering false alarm rates. Several studies, using statistical inference, have been proposed overcome this challenge. This work presents an advanced approach for decision-making nuclear decommissioning. The results indicate that method allows adjust confidence degree stationarity background signal. It...