NDLI: Thoron and radon activity concentration in mineral waters of spas from southeastern Brazil

Content Provider	Springer Nature Link
Author	Salim, L. A. Bonotto, D. M.
Copyright Year	2014
Abstract	This work presents results of the measurements of thoron ($^{220}$Rn) and radon ($^{222}$Rn) activity concentration in 23 mineral waters sources occurring at the cities of Águas da Prata, Poços de Caldas, Águas de Lindóia, and Águas de São Pedro that are spas located at Minas Gerais and São Paulo States, Brazil. Physico-chemical parameters and dissolved gases have been also reported to understand the circulation environment of the waters, which indicated that it varies from transitional to reducing conditions. The thoron and radon activity concentrations ranged from 0.01 to 0.93 Bq/L and from 0.06 to 104 Bq/L, respectively. According to the Brazilian Code for Mineral Waters, these activities indicated that none of them are thoriferous, whereas two are weakly radioactive. The highest $^{220}$Rn and $^{222}$Rn levels were found in sources located in Poços de Caldas and Águas da Prata cities, within the Poços de Caldas alkaline complex. This massif is a well-known suite of alkaline volcanic and plutonic rocks that possesses an accumulation of U, Th, other natural radionuclides, and rare-earth elements. In Villela spring, Águas da Prata city, São Paulo State, the radon activity concentration exceeded the maximum allowed value of 100 Bq/L in drinking water as proposed by WHO in 2009. Although this spring is not utilized in a regular public water-supply system, there are taps available in a park allowing the water consumption by population. However, it has not been observed any health impact on local people that would need action taken by the Government.
Starting Page	5619
Ending Page	5630
Page Count	12
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	73
Issue Number	9
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-10-29
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mineral waters Spas Thoron Radon Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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