Geo(Anthropo)genic Factors Affecting The Radioactivity In Groundwaters
From Guarani Aquifer, Brazil
Author(s)
D. M. Bonotto
Abstract
Geo(Anthropo)genic factors affecting the
radioactivity in groundwaters from Guarani
aquifer, Brazil
D. M. Bonotto
Departamento de Petrologia e Metalogenia, Instituto de Geoci2ncias e
Ciincias Exatas-UNESP, Rio Claro, Brasil.
Abstract
This investigation was carried out within the Parana sedimentary basin, involved
the sampling of 77 pumped tubular wells, and was realized with the purpose of
evaluating the radioactivity in the Brazilian part of Guarani (Botucatu-Pirarnboia,
Tacuarembo, Misiones) aquifer. The radioactivity due to nuclides belonging to
uranium and thorium series decay was investigated in terms of the uranium
isotopes 2 3 4 ~ and 2 3 8 ~ , radon ("'~n), and the radium isotopes 2 2 6 ~ a and '"~a.
The obtained results were compared with the maximum permissible
concentration limits in drinking water defined by the Brazilian national standard,
as well with the guidelines for drinking water quality established by the World
Health Organization. The importance of water-rocklsoil interact
Keywords
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