A5043229112- Radioactivity and Radon Measurements
- Geochemistry and Geologic Mapping
- Building materials and conservation
- Graphite, nuclear technology, radiation studies
- Radioactive contamination and transfer
- Geological and Geochemical Analysis
- Radiation Dose and Imaging
- Nuclear and radioactivity studies
- Nuclear Physics and Applications
- Image Processing and 3D Reconstruction
- Archaeology and ancient environmental studies
- Cultural Heritage Materials Analysis
- Hydrocarbon exploration and reservoir analysis
- Radioactive element chemistry and processing
- Archaeological Research and Protection
Universidade Estadual do Centro-Oeste
2020-2024
To explore radiochemical differences and similarities between contaminated, intact, disturbed soils, specially for decision making regulating norms, it is important to establish Quality Reference Values (QRV) related natural radionuclides. In this work the 232Th, 238U, 40K contents their respective QRV were determined soils originated from basaltic lithology in an area of approximately 22,851 km² located State Paraná, Brazil. Sampling comprised seventy-two soil samples collected horizon A...
Abstract This study aims to evaluate the thorium (Th) and uranium (U) quantification in soil employing a commercial routine portable X‐ray fluorescence (pXRF) spectrometer. Certified reference materials (CRMs), as well sample set, were measured by pXRF gamma‐ray spectrometry. The results showed that average detection limits (in mg kg −1 ) 3.3 ± 0.5 11.0 1.7, respectively. values 3.0 0.4 9.9 1.3. Quantitative for Th accordance with reported most CRMs analyzed, same was obtained comparison...
This study contributes to the insertion of gamma‐ray spectrometry technique in archaeometry by presenting spectral analysis methods determine ratios between absolute concentrations radioelements eTh (ppm), eU (ppm) and K (%) archaeological ceramics without strict control geometry. The ratio results for samples diverse geometry are consistent with obtained geometric at a 95% level statistical significance. In order show real case, were applied 14 ceramic pieces three sites Maranhão state (Brazil).
Non-destructive analytical techniques are essential tools for the study of objects with historical and cultural value. Restrictions difficulties imposed on characterization, since cannot be damaged in sample preparation process. Gamma-ray spectrometry (GRS), without strict control measurement geometry, can serve as a complementary, low-cost non-destructive technique these research areas. Unlike most other nuclear techniques, gamma detects photons from all points volume, bringing results...
In the Campos Gerais region of Paraná there are few literature that evaluate concentrations natural radioactivity. Thus, aim present work was to determine activity 226Ra, 232Th, 40K and 222Rn concentration in soil samples from Telêmaco Borba, Tibagi, Curiúva, Ventania, Lageado Bonito Ortigueira. The samples, with about 2 kg, were collected on surface at points near river bed, making sure is not under agriculture influence. Gamma-ray spectrometry analyzes performed a NaI(Tl) scintillation...