Radionuclides Quality Reference Values in Basalt derived Soils of Forest Conservation Areas Juliane Maria Bergamin Bocardi, Adelmo Lowe Pletsch, Rodrigo Oliveira Bastos, Duvan Gil Rodríguez, Sueli Pércio Quinaia Revista Brasileira De Geografia Fisica, 2025 To explore radiochemical differences and similarities between contaminated, intact, and disturbed soils, specially for decision making and regulating norms, it is important to establish Quality Reference Values (QRV) related to natural radionuclides. In this work the 232Th, 238U, and 40K contents and their respective QRV were determined for soils originated from basaltic lithology in an area of approximately 22,851 km² located in the State of Paraná, Brazil. Sampling comprised seventy-two soil samples collected from horizon A in Environmental Conservation Areas, and all of them were analyzed by laboratory gamma ray spectrometry. The results showed total QRV (including all sampled soils) for 232Th, 238U, and 40K, at the 75th percentile, of 57.34 Bq.kg-1 (14.1 ppm of eTh), 36.63 Bq.kg-1 (3.0 ppm of eU) and 56.28 Bq.kg-1 (0.18% K). It was observed a tendency to higher values of 232Th and 238U, and lower values of 40K, according to the soil maturation (Entisol, Ultisol, Oxisol). The same tendency is observed with the increasing of clay content. These appointments were particularly cleared by Principal Component Analysis (PCA). The QRV were also obtained by soil classes, which helps verify their differences in concentrations to avoid erroneous conclusions related to possible contamination of disturbed soils and to provide subsidies for the comparative study of soils with similar characteristics.
Teaching physics remotely: determining the speed of sound in the air using a pan flute Luiz Artur Cordeiro Filho, Rodrigo Oliveira Bastos Physics Education, 2024 The COVID-19 pandemic led to the closure of schools and the transition to online teaching, making it necessary to find solutions for lab-based subjects such as experimental physics. In scenarios like this, a good alternative is for students to conduct experiments at home. In this study, we evaluated the potential of a pan flute for teaching acoustics at a distance. We explored the simplicity of assembly, the need for only common materials, and the ability to collect data at home with audio software support. To explore the feasibility of the project, a model of the flute was built. Data were collected, and the average value obtained for the speed of sound in the air was 338 m s−1, with a relative error of 1.4% to the expected value. During the pandemic, this experiment was integrated into two undergraduate courses and the students successfully completed the construction of the instrument, collected data, and estimated the speed of sound, demonstrating positive results in distance learning.
Thorium and uranium rapid quantification in soil with portable X-ray fluorescence Fábio L. Melquiades, Rodrigo O. Bastos, Leandro Rampim, Israel Isaías Sandrino, Duvan Gil Rodriguez, et al. Soil Science Society of America Journal, 2024 This study aims to evaluate the thorium (Th) and uranium (U) quantification in soil employing a commercial routine in a portable X‐ray fluorescence (pXRF) spectrometer. Certified reference materials (CRMs), as well as a soil sample set, were measured by pXRF and gamma‐ray spectrometry. The pXRF results showed that the thorium average detection and quantification limits (in mg kg −1 ) were 3.3 ± 0.5 and 11.0 ± 1.7, respectively. The uranium values were 3.0 ± 0.4 and 9.9 ± 1.3. Quantitative pXRF results for Th were in accordance with the reference reported for most CRMs analyzed, and the same accordance was obtained in the comparison with gamma‐ray spectrometry results for the soil sample set. However, U results were overestimated by pXRF when compared both with the CRM‐reported values and the gamma‐ray spectrometry results. In conclusion, the tested pXRF commercial routine may be a viable technique to identify variations in natural Th levels in soil but needs to be used with caution to identify and quantify U.
Newton's law of cooling with a low-cost thermoscope: Physics in the time of covid-19 Rodrigo Oliveira Bastos, Luiz Artur Cordeiro Filho, Renato Akio Ikeoka Physics Education, 2022 The necessity to teach experimental physics in the pandemic period motivated the development of practices in which students may take measurements with instruments constructed by themselves. In this article, we present an experimental practice to approach Newton’s law of cooling with a thermoscope (the earliest device for detecting changes in temperature, forerunner of the thermometer) constructed with household materials. Although the use of a non-calibrated thermoscope, the instrument presented several advantages, visual appeal, ease of handling, ease of data acquisition and good reproducibility. The students can take data, plot graphs, and verify if the Newton’s law of cooling holds on the tested circumstances.
Be-7 measurement in an urban area using a low-resolution gamma spectrometer AZ Neto, RO Bastos, BW Borsoi, RA Ikeoka, FL Melquiades, JMF Lopes, ... Applied Radiation and Isotopes, 112529 , 2026 2026
Calibration transfer from HPGe to NaI (Tl) detectors for radionuclides quantification JMF Lopes, FL Melquiades, RO Bastos, AZ Neto, AC Andrello Journal of Environmental Radioactivity 293, 107885 , 2026 2026 Citations: 1
7Be measurements in agricultural soil using a low resolution NaI (Tl) detector BW Borsoi, RO Bastos, AZ Neto, DG Rodríguez, JMF Lopes, AC Andrello, ... Radiation Measurements, 107591 , 2025 2025 Citations: 1
XRF and gamma-ray data fusion for predicting key soil fertility attributes JV Ribeiro, JMF Lopes, AC Andrello, JF de Oliveira, GMC Barbosa, ... Radiation Physics and Chemistry 234, 112750 , 2025 2025 Citations: 3
Spectral deconvolution approach for beryllium-7 detection: Evaluating soil redistribution with nai (tl) detectors JMF Lopes, FL Melquiades, RO Bastos, JF de Oliveira, GMC Barbosa, ... Radiation Physics and Chemistry 225, 112153 , 2024 2024 Citations: 6
Teaching physics remotely: determining the speed of sound in the air using a pan flute LAC Filho, RO Bastos Physics Education 59 (3), 035012 , 2024 2024 Citations: 1
Characterization of fossils from the museum of natural sciences of Guarapuava by gamma-ray spectrometry DG Rodríguez, RA Ikeoka, RO Bastos Journal of Radioanalytical and Nuclear Chemistry 333 (4), 1745-1757 , 2024 2024 Citations: 2
Thorium and uranium rapid quantification in soil with portable X‐ray fluorescence FL Melquiades, RO Bastos, L Rampim, II Sandrino, DG Rodriguez, ... Soil Science Society of America Journal 88 (2), 557-564 , 2024 2024 Citations: 7
VALIDATION OF THE SYSMEX XN-10 AUTOMATED HEMATOLOGY COUNTER FOR CELL COUNTING IN BONE MARROW SAMPLES R Bastos, R Penteado, A Villarinho, C Ito, C Monteiro, F Sousa, ... INTERNATIONAL JOURNAL OF LABORATORY HEMATOLOGY 45, 12-12 , 2023 2023
PROTÓTIPO DETECTOR DE FAÍSCAS PARA PARTÍCULAS ALFA: UMA PROPOSTA EDUCACIONAL SEM USO DE FONTES RADIOATIVAS AG Maquera, FL Melquiades, OHM da Silva, RM Toginho, PRC Silva, ... Revista Ciências & Ideias ISSN: 2176-1477, 225-241 , 2022 2022
Newton’s law of cooling with a low-cost thermoscope: physics in the time of covid-19 RO Bastos, LA Cordeiro Filho, R Akio Ikeoka Physics Education 57 (4), 045001 , 2022 2022 Citations: 6
Determination of the activity concentration of 226Ra, 232Th, 40K and the concentration of 222Rn in soil samples of the Campos Gerais region (Paraná) G Rosa, A de Oliveira Ferreira, DG Rodriguez, RO Bastos Brazilian Journal of Radiation Sciences 9 (1A) , 2021 2021 Citations: 1
Gamma‐ray spectrometry in the characterization of diverse‐geometry archaeological ceramics DG Rodriguez, RO Bastos, RA Ikeoka, CR Appoloni, AM Bandeira Archaeometry 63 (2), 284-295 , 2021 2021 Citations: 9
Obtaining the Bragg curve using a low-cost detector A Klosowski, RO Bastos European Journal of Physics 42 (2), 024001 , 2021 2021 Citations: 1
Activity concentration of 226Ra, 232Th, 40K and 222Rn in soil samples of the Campos Gerais region (Paraná, Brazil) G Rosa, AO Ferreira, DG Rodriguez, RO Bastos 2021
Inverse problems in geomagnetism: the magnetic anomaly exploration game RO Bastos Physics Education 55 (6), 063007 , 2020 2020 Citations: 1
Practical measurements in radioactivity with the electroscope and the Tracker software RO Bastos Physics Education 55 (5), 055007 , 2020 2020 Citations: 6
Coupling soil transfer from hillslope to riparian zone through natural fingerprint in a catchment with tobacco crop FL Melquiades, RO Bastos, LS Andreoni, EL Thomaz, V Antoneli Journal of Soils and Sediments 19 (4), 1928-1936 , 2019 2019 Citations: 5
Modern projection of the old electroscope for nuclear radiation quantitative work and demonstrations RO Bastos, LB Boch Physics Education 52 (6), 064001 , 2017 2017 Citations: 3
Practical-experimental activities in Physics Education CA Boff, RO Bastos, FL Melquiades 2017
MOST CITED SCHOLAR PUBLICATIONS
Correction for the effect of soil moisture on in situ XRF analysis using low‐energy background RO Bastos, FL Melquiades, GEV Biasi X‐Ray Spectrometry 41 (5), 304-307 , 2012 2012 Citations: 77
X-ray fluorescence and gamma-ray spectrometry combined with multivariate analysis for topographic studies in agricultural soil NDB de Castilhos, FL Melquiades, EL Thomaz, RO Bastos Applied Radiation and Isotopes 95, 63-71 , 2015 2015 Citations: 21
Radioactivity of rocks from the geological formations belonging to the Tibagi River hydrographic Basin RO Bastos Universidade Estadual de Londrina (UEL), PR (Brazil). Dept. de Fisica. Curso … , 2008 2008 Citations: 17
Granulometry and Moisture Influence for In Situ Soil Analysis by Portable EDXRF FL Melquiades, RO Bastos, GEV Biasi, PS Parreira, CR Appoloni AIP Conference Proceedings 1351 (1), 317-320 , 2011 2011 Citations: 13
Some geological characteristics in a regolith-limey shale rock profile through natural radionuclides distribution AO Ferreira, RO Bastos, CR Appoloni Applied Radiation and Isotopes 68 (9), 1774-1779 , 2010 2010 Citations: 11
Gamma-ray measurements in uppermost soil profile of a grazing area around Londrina City, Paraná State, Brazil RO Bastos, AC Andrello, CR Appoloni INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE , 2005 2005 Citations: 11
Gamma‐ray spectrometry in the characterization of diverse‐geometry archaeological ceramics DG Rodriguez, RO Bastos, RA Ikeoka, CR Appoloni, AM Bandeira Archaeometry 63 (2), 284-295 , 2021 2021 Citations: 9
Environmental gamma radiation in municipalities of Eastern of São Paulo State, Brazil RO Bastos, EM Pascholati Terrae 2 (1-2), 37-45 , 2005 2005 Citations: 9
Radiação Gama natural de distintos litotipos e a estimativa de dose a eles associada, em municípios do leste do estado de São Paulo RO Bastos Instituto de Geociências Universidade Estadual de Campinas, São Paulo … , 2002 2002 Citations: 9
Self-Attenuation Correction in Gamma-Ray Spectrometric Analyses of Geological Samples Using the Transmission Method RO Bastos, AO Ferreira, CR Appoloni Proceeding of International Nuclear Atlantic Conference/VIII ENAN, 1-8 , 2007 2007 Citations: 8
Thorium and uranium rapid quantification in soil with portable X‐ray fluorescence FL Melquiades, RO Bastos, L Rampim, II Sandrino, DG Rodriguez, ... Soil Science Society of America Journal 88 (2), 557-564 , 2024 2024 Citations: 7
Práticas experimentais no ensino de física nuclear utilizando material de baixo custo CA Boff, RO Bastos, FL Melquiades Caderno Brasileiro de Ensino de Física 34 (1), 236-247 , 2017 2017 Citations: 7
Radioatividade de rochas provenientes das formações geológicas pertencentes à bacia hidrográfica do rio Tibagi RO Bastos Tese (Doutorado), Departamento de Física, Universidade Estadual de Londrina … , 2008 2008 Citations: 7
Spectral deconvolution approach for beryllium-7 detection: Evaluating soil redistribution with nai (tl) detectors JMF Lopes, FL Melquiades, RO Bastos, JF de Oliveira, GMC Barbosa, ... Radiation Physics and Chemistry 225, 112153 , 2024 2024 Citations: 6
Newton’s law of cooling with a low-cost thermoscope: physics in the time of covid-19 RO Bastos, LA Cordeiro Filho, R Akio Ikeoka Physics Education 57 (4), 045001 , 2022 2022 Citations: 6
Practical measurements in radioactivity with the electroscope and the Tracker software RO Bastos Physics Education 55 (5), 055007 , 2020 2020 Citations: 6
Coupling soil transfer from hillslope to riparian zone through natural fingerprint in a catchment with tobacco crop FL Melquiades, RO Bastos, LS Andreoni, EL Thomaz, V Antoneli Journal of Soils and Sediments 19 (4), 1928-1936 , 2019 2019 Citations: 5
Gamma Radiation Dose Rate in Air due to Terrestrial Radionuclides in Southern Brazil: Synthesis by Geological Units and Lithotypes Covered by the Serra do Mar Sul Aero … RO Bastos, CR Appoloni, JPP Pinese AIP conference proceedings 1034 (1), 403-406 , 2008 2008 Citations: 5
XRF and gamma-ray data fusion for predicting key soil fertility attributes JV Ribeiro, JMF Lopes, AC Andrello, JF de Oliveira, GMC Barbosa, ... Radiation Physics and Chemistry 234, 112750 , 2025 2025 Citations: 3
