BRIGITTE ROXANA SOREANU PECEQUILO

Resumo

Bachelor in Physics, University of São Paulo (1967), Master in Nuclear Technology, University of São Paulo (1971) and PhD in Nuclear Technology, University of São Paulo (1977). Was researcher at the Institute of Energy and Nuclear Research (IPEN) from 1969 to 2014. Currently is a collaborator of IPEN with the project "Gamma Spectrometry and trace detectors as tools for evaluation of natural and artificial radioactivity in several samples" and superviser at the Graduate Program of IPEN. Has experience in nuclear engineering, with emphasis on Radioisotopes Applications, acting on the following topics: nuclear instrumentation, dose assessment, environmental monitoring, natural radioactivity, alpha and gamma spectrometry, gross alpha and beta radioactivity measurements and nuclear trace detectors . As IAEA expert in the determination of radioactivity concentrations with alpha and gross beta counting systems with low background proportional detector had been in Asuncion, Paraguay (2004) and in Cuenca, Ecuador (2007). Since 1978 is professor in charge of the graduate course of IPEN, Advanced Topics in Nuclear Measurements. (Text obtained from the Currículo Lattes on October 6th 2021)


Possui graduação em Bacharel Em Física pela Universidade de São Paulo (1967), mestrado em Tecnologia Nuclear pela Universidade de São Paulo (1971) e doutorado em Tecnologia Nuclear pela Universidade de São Paulo (1977). Foi pesquisadora do Instituto de Pesquisas Energéticas e Nucleares (IPEN) de 1969 a 2014. Atualmente é colaboradora do IPEN com o projeto "Espectrometria gama e detectores de traços como ferramentas para avaliação de radioatividade natural e artificial em amostras diversas" e orientadora no Programa de Pós-Graduação do IPEN. Tem experiência na área de Engenharia Nuclear, com ênfase em Aplicações de Radioisótopos, atuando principalmente nos seguintes temas: instrumentação nuclear, avaliação de dose, monitoracao ambiental, radioatividade natural, espectrometria alfa e gama, medidas de radioatividade alfa e beta total e detectores de traços. Como expert da AIEA na operacionalização de sistemas de contagem alfa e beta total com detector proporcional de baixa radiação de fundo para a determinação da concentração de radioatividade em água potável, esteve em Assunção, Paraguai (2004) e em Cuenca, Equador (2007). Desde 1978 é professora-responsável do curso de pós-graduação do IPEN, Tópicos Avançados de Medidas Nucleares. (Texto extraído do Currículo Lattes em 06 out. 2021)

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  • Capítulo IPEN-doc 23894
    The influence of environmental aspects in the variation of natural radioactivity levels in selected brazilian beach sand samples
    2014 - BARROS, LIVIA F.; PECEQUILO, BRIGITTE R.S.
    At beaches, environmental implications added to shoreline erosion and artificial interventions on native structure may alter the concentration of the natural radionuclides in certain regions of the coast. In this work, eleven locations at Camburi beach, known to be a naturally high background region, were studied in 2011. The influence of environmental aspects, as geology, average temperatures, variations of the height of the tides and the rainfall levels were related with the variation of 226Ra, 232Th and 40K activities concentrations, during the year 2011 and annual effective dose were evaluated from the 226Ra, 232Th and 40K sands activities concentrations. Sand samples were monthly collected during 2011, dried, sealed in standard 100 mL HPDE polyethylene flasks and measured by high resolution gamma spectrometry after a 4 weeks in-growth period. The results, considering samples gamma-rays self-attenuation, show activities concentrations in the range from 4 Bq kg-1 to 1380 Bq kg-1 for 226Ra, 9 Bq kg-1 to 7453 Bq kg-1 for 232Th, and 6 Bq kg-1 to 504 Bq kg-1 for 40K. The absorbed dose rate (D) in outdoor air values laid from 9 nGy.h-1 to 5160 nGy.h-1 .The annual effective dose values for the sand samples considering a daily exposure of 24 hours all year round laid from 0.05 mSv.y-1 to 31.64 mSv.y-1. The annual effective dose values for the sand samples considering daily exposure of one hour all year round laid from 0.002 mSv.y-1 to 1.318 mSv.y-1.The annual effective dose (E) for the beach collection points for a resident of Vitoria city, with one hour daily exposure all year round by collection point laid from 0.003 mSv.y-1 to 0.232 mSv.y-1. The annual effective dose (E) for the collection points from Camburi beach for a tourist with 8 hours daily exposure on january, july or both, laid from 0.004 mSv.y-1 to 0.446 mSv.y-1. For a resident of Vitoria city and for a tourist, in the conditions of exposure of this work, all values of E are lower than the limit of 1 mSv y-1, recommended for ICRP 60 for the general public. In some months of the year 2011, low average temperatures, low rainfall levels and low variations of the height of the tides can be related with high 226Ra, 232Th and 40K activities concentrations. In April and in October, high rainfall levels and high variations of the height of the tides can be related with low 226Ra, 232Th and 40K activities concentrations.