Radiological study in caves of Southwest Brazil
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2008
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SOUTH PACIFIC ENVIRONMENTAL RADIOACTIVITY ASSOCIATION CONFERENCE, 8th
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The Parque Estadual Turístico do Alto Ribeira (PETAR) is located in the Southwestern
part of São Paulo State, in Ribeira Valley. In this region is found the major number of
cave occurrence in Brazil and also shelters the most visited caves of the country. Caves,
usually located in a karstic zone, are characterized by the presence of carbonaceous
rocks frequently fractured and collapsed. Carbonates (dolomites and calcite rocks)
usually have low U and Th, however, surrounding rocks can be found containing in
structural positions U and Th. Radon generated in these rocks may migrate in the
subsoil penetrating this carbonate due to its greater permeability causing high radon
concentration. It is known that radon emission depends on conditions of the local
micrometerology, geological factors and the concentration of U and Th Decay series. In
the sense to understand the radon concentrations in these caves, the objective oh this
paper is to determine the 238U, 232Th, 226Ra, 228Ra and 210Po in rock, soil and sediment
samples by alpha spectrometry and total alpha and beta measurement. The
concentrations of radon and thoron in the air’s cave were determined in air by solid state
nuclear track detectors. As a complementary study neutron activation analysis also were
performed in soil, rock and sediment samples.
Six of the most visited caves, named Santana, Água Suja, Morro Preto, Couto, Alambari
and Laje Branca were studied. High radon concentrations were found in Santana Cave,
the same with higher concentrations of U and Th.
Como referenciar
ALBERIGUI, S.; SILVA, P.S.C.; CAMPOS, M.P.; DAMATTO, S.R.M.; PECEQUILO, B.R.; FAVARO, D.I.T.; MAZZILLI, B.P. Radiological study in caves of Southwest Brazil. In: SOUTH PACIFIC ENVIRONMENTAL RADIOACTIVITY ASSOCIATION CONFERENCE, 8th, November 23-27, 2008, Christchurch, New Zealand. Abstract... p. 55. Disponível em: http://repositorio.ipen.br/handle/123456789/19158. Acesso em: 13 Mar 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.