A5035832845- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Radiation Effects in Electronics
- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- Photorefractive and Nonlinear Optics
- Graphite, nuclear technology, radiation studies
- Nuclear Physics and Applications
- Radiation Effects and Dosimetry
- Nuclear Materials and Properties
- Nuclear reactor physics and engineering
- Fusion materials and technologies
- Laser Design and Applications
- Electron and X-Ray Spectroscopy Techniques
- Advanced Radiotherapy Techniques
- Metallurgical Processes and Thermodynamics
- Quantum optics and atomic interactions
- X-ray Diffraction in Crystallography
- Advanced Frequency and Time Standards
- Advancements in Battery Materials
- Atomic and Subatomic Physics Research
- Laser-Matter Interactions and Applications
- Nuclear Engineering Thermal-Hydraulics
- Radiation Therapy and Dosimetry
- Silicon and Solar Cell Technologies
Instituto de Pesquisas Energéticas e Nucleares
2004-2022
National Nuclear Energy Commission
2004-2022
Laboratoire Charles Fabry
2014
This work investigates the influence of doping type on dose responses and accumulated stability n- p-type silicon MCz diodes. The operating principle diode-based dosimeters relies measuring radiation-induced currents delivered by non-polarized diodes throughout exposure time. An electrometer promptly reads current signal, linearly rate dependent. offline integration signal provides charge generated in sensitive volume diode, expected to be proportional absorbed dose. experimental approach...
The dosimetric response of silicon diodes produced with distinct engineering technologies, Magnetic Czochralski (MCz), and standard Float Zone (Fz), has been investigated, aiming at their use for online dosimeters in gamma radiation processing applications. p + -n-n junction diodes, 300 µm thick an active area 25 mm 2 , are operated as the short-circuit current mode. In this case, key quantity is dose rate, which correlated output from diode subjected to radiation. Thus, obtained offline by...
This study investigates the high temperature oxidation behaviour of a Ni–20Cr-1.2Si (wt.%) alloy in steam from 1200 °C to 1350 by Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS) and Diffraction (XRD). The results demonstrate that exposed Ni-based developed thin oxide scale, consisted mainly Cr2O3. kinetics obtained experimental was applied evaluate hydrogen generation considering simplified reactor core model with different...
In this work we describe the results obtained with S3590-06 and ion-implanted diodes for alpha particle spectrometry. Satellite peaks were also investigated in order to identify not only origin of these phenomena, but importance guard ring region on their relative intensities. The preliminary indicate that true cause spurious satellite might be associated weak electric fields around rings changes entrance window absorption near edge diodes. Further steps are needed clear up problem.
Using a temperature-tuned ppKTP crystal, record 1.3W single-frequency red laser at 661nm is achieved from intra-cavity second-harmonic generation of Nd:YLiF4 ring oscillating on the π-polarized transition (λ~1321nm).
This work presents the preliminary results obtained with a rad-hard MCz silicon diode as high-dose gamma dosimeter. device is p <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">+</sup> /n/n junction diode, made on Si wafer manufactured by Okmetic Oyj., Vantaa, Finland and processed Microelectronics Center of Helsink University Technology. The about photocurrent registered total charge accumulated function dose are presented. dosimetric response...
In this work, we report on the results obtained with rad-hard Standard Float Zone (STFZ) and Diffused Oxygenated (DOFZ) silicon diodes in radiation processing dosimetry. The dosimetric probes were designed to operate direct current mode, as on-line dosimeter. irradiation of samples was performed using a 60Co source dose rate almost 2.4 kGy/h. response each diode measured function exposure time steps from 5 kGy up 50 achieve total absorbed 275 kGy. range it is observed significant decrease...
Using a type-I critically phase-matched bismuth borate crystal, record 620 mW single-frequency red laser at 671 nm is achieved from intra-cavity SHG of π-polarized single-end pumped Nd:YVO4 ring oscillating on the λ~1342nm transition.
In this paper we describe the performance of an ion-implanted diode (Al/p <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">+</sup> /n/n /Al), developed in framework R&D programs for future CMS experiment at LHC, detection and spectrometry X- gamma-rays envisaging its use characterization porous microstructures by X-ray microtomography. The effects reverse bias on both electronic noise energy resolution were studied using...
Maraging steels are martensitic hardened by precipitation of intermetallic compounds in thermal aging, with good machining properties and high strength, fracture toughness corrosion resistance, being used aircraft parts rocket motor-case, tooling applications nuclear plants. During aging steam atmosphere a protective resistant oxide layer is formed over the bulk. In this work, conventional Bragg-Brentano geometry was to identify phases four specimens maraging steel grade 300 different...
Maraging steels are martensitic hardened by precipitation during thermal aging, with good machining properties and high strength corrosion resistance. It is well suited for applications which require strength-to-weight material, being used in aerospace, aeronautics nuclear industries. A protective resistant oxide layer can be formed age hardening if treated steam atmosphere. This work aims to use grazing incidence X-ray diffraction (GIXRD) evaluate qualitatively the thickness of layers this...
Coherent population trapping (CPT) of metal-alkali atoms is an interesting technique for the development compact atomic frequency references; it relies on excitation by two phase-coherent laser fields. We describe design and operation innovating dual-frequency source dedicated to Cs CPT clocks, based direct dual-polarization optically-pumped semiconductor at 852 nm. The phase noise beatnote generated maximum −90 dBrad2/Hz with active stabilization, relative intensity (RIN) has been measured...
In this work, we demonstrate indeed that complex cascaded second-order nonlinear processes occurring inside the ppKTP crystal are responsible of KLM operation a sigma-polarized (lambda=1321nm) Nd:YLF/ppKTP ring laser, over full range temperature tuning. The preliminary analysis laser emission versus or intra-cavity power demonstrates unambiguously tendency to Kerr-lens mode locking (KLM) effects, which threshold occurs at about 5 W diode pump power. Mid-IR spectra recorded with an optical...
In this Paper we describe the performance of a rad-hard diode (Al/p <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">+</sup> /n/n /Al), developed in framework research and development programs for future CMS experiment at LHC, detection spectrometry X-and gamma-rays envisaging its use characterization porous structures by X-ray tomography. The diode's response was studied using xmlns:xlink="http://www.w3.org/1999/xlink">57</sup> Co,...
In this work, we report on results obtained with two rad-hard Diffusion Oxygenated Float Zone (DOFZ) silicon diodes as on-line gamma dosimeter in radiation processing. One device was not irradiated before using a dosimeter, while the other received pre-dose of 700 kGy. The samples irradiation performed 60Co source at dose rate 2.50 kGy/h from 5 kGy up 275 It investigated dosimetric response these devices, operating short-circuit current mode, respect to sensitivity dependence and charge-dose...
Single-frequency operation of diode-pumped Nd:YLiF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> and Nd:YVO continuous-wave (cw) ring lasers are investigated in the 1.31-1.34 mum range, together with their intracavity second-harmonic generation to red spectral range (0.65-0.67 mum) using either BiB xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> (BiBO), LiB...