A5074720669- Nuclear Physics and Applications
- Radioactive contamination and transfer
- Radioactive element chemistry and processing
- Nuclear reactor physics and engineering
- Radioactivity and Radon Measurements
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Graphite, nuclear technology, radiation studies
- Nuclear and radioactivity studies
- Radiation Detection and Scintillator Technologies
- Nuclear Materials and Properties
- Advanced Differential Geometry Research
- Nonlinear Waves and Solitons
- Isotope Analysis in Ecology
- Quantum Electrodynamics and Casimir Effect
- X-ray Spectroscopy and Fluorescence Analysis
- Statistical and numerical algorithms
- Nuclear Issues and Defense
- Advanced X-ray and CT Imaging
- Algebraic and Geometric Analysis
- Radiation Shielding Materials Analysis
- Advanced Semiconductor Detectors and Materials
Joint Research Centre
2015-2019
Hungarian Academy of Sciences
2000-2013
HUN-REN Centre for Energy Research
2013
Institute of Materials and Environmental Chemistry
2003
Institute for Particle and Nuclear Physics
1996-1997
The Joint Research Centre (JRC) in Karlsruhe, partnership with the Directorate General for Energy (DG ENER), plays a critical role ensuring accurate analysis of nuclear materials, as mandated by EURATOM Treaty. Analytical Service at JRC Karlsruhe is dedicated to maintaining highest standards quality, accuracy, and traceability its analytical measurements, focus on uranium plutonium content isotopic composition. Our laboratory accredited according ISO/IEC 17025 has proven track record...
The present work describes a method for the preparation and validation of plutonium age dating reference materials. test samples prepared in this context could be used to validate experimental protocols determining production date via 234U/238Pu, 235U/239Pu, 236U/240Pu, 241Am/241Pu chronometers. starting material was using reactor-grade plutonium, which purified dedicated guarantee high Pu recovery, while maximizing U Am separation efficiencies. factors were determined by addition...
High-resolution gamma-spectrometry (HRGS) has been used for monitoring burn-up of VVER-440 spent fuel assemblies. The objective is to support calculations by an independent experimental method. Measurements were carried out using a collimator tube built into the concrete wall service pit in reactor block at Paks Nuclear Power Plant. Fuel assemblies sunk down pit, positioned front collimator, and moved up under water refueling machine. measured Cs-134/Cs-137 activity ratio good correlation...
Low enriched uranium samples of unknown origin were analyzed by 16 laboratories in the context a Collaborative Materials Exercise (CMX), organized Nuclear Forensics International Technical Working Group (ITWG). The purpose was to compare and prioritize nuclear forensic methods techniques, evaluate attribution capabilities among participants. This paper gives snapshot gamma spectrometric participating summarizes results achieved spectrometry.
The 232U content of various uranium-bearing items was measured using low-background gamma spectrometry. method is independent the measurement geometry, sample form and chemical composition. Since an artificially produced isotope, it carries information about previous irradiation material, which relevant for nuclear forensics, safeguards reactor operations. A correlation between 235U enrichment investigated samples has been established, consistent with theoretical predictions. It also shown...
A generalization of the notion ellipsoids to curved Riemannian spaces is given and possibility use it in describing shapes rotating bodies general relativity examined. As an illustrative example, stationary, axisymmetric perfect-fluid spacetimes with a so-called confocal inside ellipsoidal symmetry are investigated detail under assumption that 4-velocity fluid parallel time-like Killing vector field. class metrics representing interior NUT-spacetimes obtained along vacuum solution non-zero...
Passive high resolution gamma spectrometry was applied to determine the mass of nuclear material in inhomogeneous mixture broken spent fuel pieces repacked into 72 canisters, following an incident which 30 VVER-440 assemblies became damaged and unusable. The HPGe detector placed behind a collimator built concrete wall service pit reactor block. Calibration measurements were performed by intact assemblies, whose burn-up calculated declared operator power plant. Canisters reference scanned...
Stationary perfect-fluid configurations of Einstein's theory gravity are studied. It is assumed that the 4-velocity fluid parallel to stationary Killing field, and also norm twist potential field functionally independent. has been pointed out earlier by one us (I.R.) for these geometries some basic equations invariant under an $SL(2,R)$ transformation. Here it shown this transformation can be applied generate possibly new solutions from existing known ones only case barotropic equation state...
Using a 3-dimensional formulation of general relativity for non-empty spacetimes admitting non-null Killing field, transformation generating new non-vacuum solutions Einstein's equations and its specialization to perfect-fluid configurations is presented. Assuming that the twist field gradient, it shown can be applied generate possibly only when strong restriction on equation state imposed (i.e. ρ + 3P = 0 or P) or, alternatively, case static spacetimes. Furthermore, relation described...
Gamma-spectrometric methods suitable for the characterization of highly enriched uranium samples encountered in illicit trafficking nuclear materials are presented. In particular, procedures determining 234U, 235U, 238U, 232U and 236U contents age described. Consequently, total content isotopic composition can be calculated. For 238U a low background chamber was used. addition, dating also performed using low-background spectrometry.
The properties of a transformation previously considered for generating new perfect-fluid solutions from known ones are further investigated. It is assumed that the 4-velocity fluid parallel to stationary Killing field, and also norm twist potential field functionally related. This case complementary studied in our previous paper. can be applied generate possibly only barotropic equation state or, alternatively, static spacetime. For spacetimes method recovers Buchdahl transformation....