A5046789396- Fusion materials and technologies
- Nuclear Materials and Properties
- Magnetic confinement fusion research
- Fuel Cells and Related Materials
- Nuclear reactor physics and engineering
- Semiconductor materials and devices
- Advanced Battery Technologies Research
- Nuclear materials and radiation effects
- Superconducting Materials and Applications
- Radiopharmaceutical Chemistry and Applications
- Diamond and Carbon-based Materials Research
- Metal and Thin Film Mechanics
- Ion-surface interactions and analysis
- Chemical Synthesis and Characterization
- Nuclear Physics and Applications
- Hydrogen Storage and Materials
- Membrane-based Ion Separation Techniques
- Advanced ceramic materials synthesis
- Radiation Therapy and Dosimetry
- Membrane Separation Technologies
- Ammonia Synthesis and Nitrogen Reduction
- Silicon Nanostructures and Photoluminescence
- Advanced Materials Characterization Techniques
- Advanced Radiotherapy Techniques
- GDF15 and Related Biomarkers
University of Latvia
2015-2024
Riga Stradiņš University
2023
Riga Technical University
2023
Liga Contra el Cancer
2022
Royal Military Academy
2020
University of Bucharest
2017
Proton exchange membranes (PEM), which have been commonly used in fuel cells raised interest for the application harsh environments involving ionizing radiation. Therefore, radiation stability and ability to sustain their functionality under environment are of great interest. Within this study, electron beam irradiation dose range from 50 500kGy was evaluate effects on physico-chemical mechanical properties two types PEM: commercial Nafion®117 sulfonated poly(ether-ether-ketone) (SPEEK) with...
The radionuclides 43Sc, 44g/mSc, and 47Sc can be produced cost-effectively in sufficient yield for medical research applications by irradiating natTi natV target materials with protons. Maximizing the production of therapeutic highest cross section energy range 24–70 MeV results co-production long-lived, high-γ-ray-energy 46Sc 48Sc contaminants if one does not use enriched materials. Mass separation used to obtain high molar activity isotopically pure Sc from natural materials; however,...
Tritium depth profile and its temperature programmed desorption rate were determined for selected samples cut out of beryllium tiles removed from the Joint European Torus vacuum vessel during 2012 shut down. A dissolution method under controlled conditions was used to determine tritium in samples, whereas experiments performed assess release pattern. Released measured using a proportional gas flow detector. Prior experiments, plasma-facing surfaces studied by scanning electron microscopy...
Abstract In this study, a tritium enrichment system in the water phase has been developed based on combination of proton exchange membrane (PEM) electrolysis cell and fuel cell. As PEM, Nafion TM laboratory-synthesized sulfonated poly(ether ether ketone) membranes modified with an additional graphene layer order to enhance separation factor were used. Both differences kinetics hydrogen evolution reaction transport through different isotopes are driving factors expected affect isotopes. The...
The ITER-Like-Wall project has been carried out at the Joint European Torus (JET) to test plasma facing materials relevant ITER. Materials being tested include both bulk metals (Be and W) coatings. Tritium accumulation mechanisms release properties depend on wall components, their location in vacuum vessel, conditions of exposure material itself. In this study, beryllium limiter tiles, plasma-facing coated Inconel components from main chamber, tungsten carbon fibre composite divertor tiles...
ITER-Like-Wall (ILW) project has been carried out at Joint European Torus (JET) to test plasma facing materials relevant International Thermonuclear Experimental Reactor – ITER [1]. Limiters and an upper dump plate of the vacuum vessel are made bulk beryllium tiles, whereas for divertor tungsten tungsten-coated carbon fibre (CFC) composite tiles used. During shutdowns in ILW1 (2012), ILW2 (2014) ILW3 (2016), selected were removed from vessel. In this study, three positions analysed, analysis...
In this study, beryllium tiles from Joint European Torus (JET) vacuum vessel wall were analysed and compared regarding their position in the differences exploitation conditions during two campaigns of ITER-Like-Wall (ILW) 2011–2012 (ILW1) 2013–2014 (ILW2) Tritium content samples assessed. Two methods used to measure tritium – dissolution under controlled thermal desorption. Prior desorption experiments, scanning electron microscopy energy dispersive x-ray spectroscopy study structure...
This study focuses on neutron-irradiated beryllium interactions with air of differing humidity, simulating water cooled fusion reactor malfunction. Beryllium in the form ∼ 1 mm ∅ pebbles has been used study. Both non-irradiated and were thermally treated studied using thermogravimetric/differential thermal analysis dry airflow relative humidity (RH) < 5 % humid > 90% RH. Surface structure composition was investigated scanning electron microscopy (SEM) energy dispersion X-ray spectrometry...
Abstract This work was carried out to identify sources of errors, uncertainties and discrepancies in studies fuel retention wall components from the JET tokamak using methods based on thermal desorption. Parallel aims were establish good practices measurements unify procedures data handling. A comprehensive program designed for deuterium quantification comprised definition preparation two types materials (samples limiter Be tiles deuterium-containing targets produced laboratory by...
Silicon nitride (Si 3 N 4 ) due to its good mechanical and electrical properties is a promising material for wide range of applications, including exploitation under action ionizing radiation. For estimating the changes chemical bonds in silicon nanolayers radiation single multi-layer nanolayered coatings on prepared Si subtrate were investigated by means Fourier transform infrared spectrometry. Three main groups signals identified both types nanolayers, at 510 820 cm -1 group broad...
Silicon nitride (Si3N4) in a form of single and multi-layer nanofilms is proposed to be used as dielectric layer nanocapacitors for operation harsh environmental conditions. Characterization surface morphology, roughness chemical bonds the Si3N4 coatings has an important role production process morphology affects contact with other components produced device. was synthesized by using low pressure vapour deposition method depositing (3 – 5 layers) on SiO2 polycrystalline silicon (PolySi). The...
In this paper, we present results on tritium release from the beryllium pebbles irradiated for 294 full power days 17 April 2003 to November 2004 neutron fluence of 1.5-2 × 1025 m-2 (E>1 MeV) at temperature 523-773 K in pebble-bed assemblies (PBA) experiment high flux reactor (HFR) Petten, Netherlands. Stages gradual and burst are evident PBA Be a ramp 2.3-4.8 K/min room 1310-1520 K. These two stages may be related by atomic diffusion bubble venting respectively. The main maximum rate was...
Scandium (Sc) has gained significant interest in nuclear medicine due to its 43Sc, 44g/mSc, and 47Sc radioactive isotopes being suitable for cancer diagnostics therapy, offering a promising avenue theranostics. Various production methods, including irradiation of enriched or naturally abundant calcium (Ca), titanium (Ti), vanadium (V) materials with different particle beams, have been investigated produce 47Sc. However, challenges persist achieving high molar activity radiochemical purity...
The aim of this study is to compare different methods used for determination the DS sulfonated membranes before and after high dose irradiation. Commercial PEEK was homogenously up 60-90% were prepared using solvent casting method. Part samples irradiated with 10 MeV electron beam 500 kGy assess ionising radiation induced effects. Both non-irradiated characterized by Fourier Transformation infrared (FT-IR) spectrometry, thermogravimetric analysis (TGA), proton nuclear magnetic resonance...
Sulfonated poly(ether ether ketone) (SPEEK) materials are promising candidates for replacing Nafion™ in applications such as proton exchange membrane (PEM) and direct methanol fuel cells. SPEEK membranes have several advantages low cost, thermal radiation stability controllable physicochemical mechanical properties, which depend on the degree of sulfonation (DS). Commercial PEEK was homogenously sulfonated up to a DS 60–90% were prepared using solvent casting method. Part samples irradiated...