Detecção de radônio e filhos em ambientes de convívio humano na cidade de Presidente Prudente, São Paulo, Brasil

• Autor(a) principal: Castro, Letícia Samanta Oliveira de [UNESP]
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/202959; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2019-04-29/000908516.pdf
• topic: Engenharia ambiental; Radon; Raios alfa; Environmental engineering

One way of human exposure to radiation is through the incorporation of natural radionuclides found in the earth's crust and in the whole environment. Radon is an invisible, odorless and tasteless gas. It occurs naturally on planet and in building materials in human living places. Radon and its radioactive decay products account for 53% (ICRP) of ambient radiation dose on Earth's surface, and are harmful to human health, possibly causing the appearance of cancer cells in the respiratory tract tissue, depending on dose and exposure. The goal of this research is study the transport phenomenology of this gas, considering the effects of plate-out, feature of Radon daughters to deposit on surfaces, to examine and better understand the different parameters (ventilation, magnetic field, etc.) which influence the diffusion of radon into the air. To that, was chosen the exposure spots of 100 CR-39 detectors in rooms of the Faculty of Science and Technology - FCT, UNESP, Campus Presidente Prudente, mounting, exposure and subsequent collection of detectors. To do the analysis of the results, chemical attack with 6,25M NaOH was initially carried out for 400min at 70° C to observe the traces and do the counting and measuring at the optical microscope. Our data suggest that some factors which possibly influence the density of traces are: the location of the building, ventilation, activity carried out on site. So human activity may have connection with differences in results. It's possible that there is a relation also with geological, geomorphological and pedological factors, because...