A5028676759- Radioactivity and Radon Measurements
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Radioactive contamination and transfer
- Radioactive Decay and Measurement Techniques
- Nuclear reactor physics and engineering
- Graphite, nuclear technology, radiation studies
- Nuclear and radioactivity studies
- Scientific Measurement and Uncertainty Evaluation
- Advanced Semiconductor Detectors and Materials
- Radioactive element chemistry and processing
- Fault Detection and Control Systems
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Issues and Defense
- Groundwater and Isotope Geochemistry
- SARS-CoV-2 detection and testing
- Atmospheric chemistry and aerosols
- Advanced X-ray and CT Imaging
- Municipal Solid Waste Management
- Radiation Shielding Materials Analysis
- Integrated Circuits and Semiconductor Failure Analysis
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Edcuational Technology Systems
- Molecular Biology Techniques and Applications
Belgian Nuclear Research Centre
2015-2024
Significance A massive atmospheric release of radioactive 106 Ru occurred in Eurasia 2017, which must have been caused by a sizeable, yet undeclared nuclear accident. This work presents the most compelling monitoring dataset this release, comprising 1,100 and 200 deposition data points from Eurasian region. The suggest reprocessing facility located Southern Urals, possibly Mayak complex. crashed satellite as well on Romanian territory (despite high activity concentrations) can be excluded....
The hypothesis that proximity to the Sun causes variation of decay constants at permille level has been tested and disproved. Repeated activity measurements mono-radionuclide sources were performed over periods from 200 days up four decades 14 laboratories across globe. Residuals exponential nuclear curves inspected for annual oscillations. Systematic deviations a purely curve differ one data set another are attributable instabilities in instrumentation measurement conditions. most stable...
Claims that proximity to the Sun causes variation of decay constants at permille level have been investigated for alpha decaying nuclides. Repeated rate measurements 209Po, 226Ra, 228Th, 230U, and 241Am sources were performed over periods 200 d up two decades various nuclear metrology institutes around globe. Residuals from exponential curves inspected annual oscillations. Systematic deviations a purely curve differ in amplitude phase one data set another appear attributable instabilities...
The hypothesis that seasonal changes in proximity to the Sun cause variation of decay constants at permille level has been tested for radionuclides disintegrating through electron capture and beta plus decay. Activity measurements 22Na, 54Mn, 55Fe, 57Co, 65Zn, 82+85Sr, 90Sr, 109Cd, 124Sb, 133Ba, 152Eu, 207Bi sources were repeated over periods from 200 d up more than four decades 14 laboratories across globe. Residuals exponential nuclear curves inspected annual oscillations. Systematic...
Claims that proximity to the Sun causes variations of decay constants at permille level have been investigated for beta-minus decaying nuclides. Repeated activity measurements 3H, 14C, 60Co, 85Kr, 90Sr, 124Sb, 134Cs, 137Cs, and 154Eu sources were performed over periods 259 d up 5 decades various nuclear metrology institutes. Residuals from exponential curves inspected annual oscillations. Systematic deviations a purely curve differ in amplitude phase one data set another appear attributable...
Some authors have raised doubt about the invariability of decay constants, which would invalidate exponential-decay law and foundation on common measurement system for radioactivity is based. Claims were made a new interaction - fifth force by neutrinos could affect thus predicting changes in rates correlation with variations solar neutrino flux. Their argument based observation permille-sized annual modulations particular rate measurements, as well transient oscillations at frequencies near...
The ISO/IEC 17025 standard requires that all significant contributions have to be propagated the measurement uncertainty, including also sampling uncertainties. We evaluated soil uncertainties for gamma-ray spectrometry by using in-house and split-sample methods. By method, uncertainty was determined comparing deviations of results average analytical uncertainty. With it calculated between-sample between-analysis variances. If is reliably determined, method recommended because fewer...
A collimated source of 241Am was scanned over the endcap a 21 year old coaxial HPGe-detector that had spent about 75% its life at room temperature (and remaining time 77 K). The detector response recorded and used as measure relative thickness top deadlayer. This not homogeneous thicker near to outer surface crystal compared centre, which could be result increased diffusion Li atoms during times kept temperature. results were with two newer HPGe-detectors proved have deadlayers.
In April 2020, several wildfires took place in and around the Chernobyl exclusion zone. These fires reintroduced radioactive particles deposited during 1986 disaster into atmosphere, causing concern about a possible radiation hazard. Several countries stations of International Monitoring System measured increased Cs137 levels. This study presents analyses made by RIVM SCK CEN/RMI 2020 wildfires. Furthermore, more in-depth research was performed after A statistical analysis detections is...