A5107003644- Diamond and Carbon-based Materials Research
- High-pressure geophysics and materials
- Radiation Detection and Scintillator Technologies
- Ion-surface interactions and analysis
- Nuclear Physics and Applications
- Electronic and Structural Properties of Oxides
- Advanced Radiotherapy Techniques
- Radiation Therapy and Dosimetry
- Advanced X-ray and CT Imaging
- Metal and Thin Film Mechanics
- Nuclear reactor physics and engineering
- Plasma Diagnostics and Applications
- Radiation Effects in Electronics
- Semiconductor materials and devices
- Laser-induced spectroscopy and plasma
- Particle Detector Development and Performance
- Nuclear Materials and Properties
- Advanced Semiconductor Detectors and Materials
- Graphite, nuclear technology, radiation studies
- Tunneling and Rock Mechanics
- Boron and Carbon Nanomaterials Research
- Integrated Circuits and Semiconductor Failure Analysis
- Analytical chemistry methods development
- Nuclear and radioactivity studies
- Rare-earth and actinide compounds
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013-2024
CEA LIST
2012-2024
CEA Paris-Saclay
2000-2022
Organisation de Coopération et de Développement Economiques
2006
Université Paris Cité
2002
Sorbonne Université
2002
Centre National de la Recherche Scientifique
2002
Direction des énergies
2001
CEA LETI
2000-2001
Direction de la Recherche Technologique
2000-2001
Electrical transport properties of thin boron doped nanocrystalline diamond films with thicknesses 60–500nm have been studied. The Raman spectra measured exhibit Fano resonances, characteristic for B concentrations close to the metal-to-insulator transition. Upon increasing concentration, sp2 carbon related resonances vanish. In such boron-doped films, a positive magnetoresistance could be observed at liquid helium temperatures. show conductivity similar that B-doped epitaxial without any...
Recent developments of new therapy techniques using small photon beams, such as stereotactic radiotherapy, require suitable detectors to determine the delivered dose with a high accuracy. The dosimeter has be close possible tissue equivalence and exhibit detection volume compared size irradiation field, because lack lateral electronic equilibrium in beam. Characteristics single crystal diamond (tissue equivalent material Z = 6, density) make it an ideal candidate fulfil most beam dosimetry...
Hadron therapy is an innovative mode of radiotherapy (RT) for cancer treatment which enables tumor cells to be more effectively destroyed than conventional RT using photons. The precise knowledge the lineal energy particles used in field microdosimetry (MKM model) as a fundamental parameter prediction relative biological efficiency (RBE) clinical beams. Based on single‐crystal CVD (scCVD) super‐thin diamond membranes obtained deep Ar/O 2 plasma etching, prototypes solid‐state microdosimeters...
Abstract In comparison with polycrystalline diamond, single crystal diamond (SC CVD) offers important advantages for applications to electronics and detection. This is because SC CVD exhibits improved charge transport characteristics, specifically a high drift mobility an increased carrier lifetime. So far, only limited studies have dealt the measurements of electrical parameters in majority these were based on industrial material only. our study we investigated properties PE grown using...
It is a common observation that diamond surface conductivity rises after exposure to hydrogen plasmas. Hydrogenation treatments are known induce p-type conductive layer, which not present on non-hydrogenated samples. However, the particular mechanisms predominant in plasma treatment process still controversial, and several antagonist conditions have been reported be of importance, such as sample temperature (500 °C 800 °C), duration (a few seconds 1 h), microwave (MW) power density, etc....
In a recent X–ray absorption study in boron doped diamond, Nakamura et al. have seen wellisolated narrow impurity band non-superconducting samples and an additional at the chemical potential superconducting sample. We interpret beautiful spectra as evidence forupper Hubbard of Mott insulating metallic 'mid–gap band' conducting 'self–doped' insulator. This supports basic framework theory present author strongly correlated superconductivity (impurity resonating valence bond, IBRVB theory)...
Recent use of very small photon beams (down to 4 mm) in stereotactic radiotherapy requires new detectors accurately determine the delivered dose. Diamond have been presented literature as an attractive candidate for this application, due their detection volume and diamond atomic number (Z = 6) which is close water effective (Zeff ∼ 7.42). However, exhibits a density 3.51 times greater than that recent studies using Monte Carlo simulations demonstrated drawback high-density detector on beam...
Single crystal (SC) diamond has since years demonstrated its interest for the fabrication of radiation detectors, especially where material properties are providing superior interests with respect to detection application. Among industrial suppliers able provide on a commercial basis high‐grade single diamond, IIa‐Tech recently appeared in market as new player. The aim this paper is assess quality one SC sample when characterized under α‐particles measurement carrier transport properties. We...
The intrinsic properties of diamond make this material theoretically very suitable for applications in medical physics. Until now ionization chambers have been fabricated from natural stones and are commercialized by PTW, but their fairly high costs long delivery times often limited use hospital. polycrystalline were investigated the past many groups. results not completely satisfactory due to nature itself. In contrast, recent progresses growth mobility single crystal synthetic diamonds...
The scope of this work was to develop a synthetic single crystal diamond dosimeter (SCDD-Pro) for accurate relative dose measurements clinical proton beams in water. Monte Carlo simulations were carried out based on the MCNPX code order investigate and reduce curve perturbation caused by SCDD-Pro. In particular, various thicknesses simulated evaluate influence active volume thickness (eAV) as well addition front silver resin (250 µm crystal) depth-dose curves. indicated that alone, with...
Abstract About 20 μm thick films were deposited in the same run by MPCVD at 900 °C on Si substrates and then hydrogenated situ during 30 min with a hydrogen plasma temperature. Their surfaces kept as prepared or more less strongly oxidized annealing 600 under ambient atmosphere sulphochromic acid aqua regia treatments. Raman spectra excited 325 632.8 nm. Spectra of as‐prepared sample exhibit structures around 2835 2895 cm –1 from monohydride carbon–hydrogen ascribed to atomically flat (111)...
Abstract Diamond exhibits a range of outstanding properties that make it material interest for radiation detection and particularly in the field dosimetry applications. In fact, its crystallographic structure makes chemically inert hard. Moreover, atomic number (carbon Z = 6) close to equivalent effective human soft tissues ( 7.4) water (reference radiotherapy) enables direct evaluation deposited dose without requiring corrections nature or energy. Finally, as bio‐compatible material, can be...
Abstract Based on a single crystal chemical vapour deposition (scCVD) diamond plate position sensitive detector [position detection (PSD)] has been fabricated. The ∼9 mm 2 sensing area of the consists diamond‐like carbon (DLC) thin film, in form plane‐pad resistive electrode layer deposited scCVD surface. 1D information is obtained from charge division between two collecting electrodes located at extremities DLC electrode. properties have tested using 241 Am α‐particles source. timing...