Radon in groundwaters from Guarany aquifer, South America: environmental and exploration implications

Bonotto, Daniel Marcos; Caprioglio, L.

doi:10.1016/s0969-8043(02)00230-0

Cited by 48 publications

(19 citation statements)

References 20 publications

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“…Olguin et al (1993) reported 11.3 Bq/L as highest value in the city of Toluca. However, much higher values have been reported over the world, like 122.2 Bq/L in Brazil (Bonotto and Caprioglio, 2002), 3735 Bq/L in China (Zhou et al, 2001) and 3470 Bq/L in Sweden (Salih et al, 2004).…”

Section: Ground-watermentioning

confidence: 88%

“…In their case, fractured rocks compose the aquifer. On the other hand, Bonotto and Caprioglio (2002) have reported that the little available data for transmissibility in Table 5 Statistical summary by locations of radon concentration in water for ground and drinking water samples the Guarany aquifer suggest only a slight inverse trend between these factors. Bonotto and Caprioglio (2002) discussed that transmissibility and radon content may be not closely related in the case of the Guarany aquifer, since the watererock contact is different in a porous aquifer than in a fractured one.…”

Section: Ground-watermentioning

confidence: 99%

“…On the other hand, Bonotto and Caprioglio (2002) have reported that the little available data for transmissibility in Table 5 Statistical summary by locations of radon concentration in water for ground and drinking water samples the Guarany aquifer suggest only a slight inverse trend between these factors. Bonotto and Caprioglio (2002) discussed that transmissibility and radon content may be not closely related in the case of the Guarany aquifer, since the watererock contact is different in a porous aquifer than in a fractured one. In the case of Chihuahua's aquifers, Table 7 presents the linear correlation coefficients between the average radon concentration in water extracted from wells and transmissibility, in one case, and total dissolved solids obtained from analysis of sampled waters, in the other hand.…”

Section: Ground-watermentioning

confidence: 99%

See 2 more Smart Citations

Radon concentrations in ground and drinking water in the state of Chihuahua, Mexico

Villalba¹,

Sujo²,

Montero-Cabrera³

et al. 2005

Journal of Environmental Radioactivity

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Section: Ground-watermentioning

confidence: 88%

Section: Ground-watermentioning

confidence: 99%

Section: Ground-watermentioning

confidence: 99%

See 1 more Smart Citation

Radon concentrations in ground and drinking water in the state of Chihuahua, Mexico

Villalba¹,

Sujo²,

Montero-Cabrera³

et al. 2005

Journal of Environmental Radioactivity

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“…As a conclusion, bathing and working in Londrina thermal spa does not impose any health risk related to the ingestion of radon in water and inhalation of radon in air both to bathers and personnel. However, this scenario may not be the same in other thermal spas utilizing the waters of Guarani aquifer, because intense variations of radon concentration have been previously identified [28]. Thus, further investigations in the aquifer are highly recommended in order to raise the radiometric data base to levels equivalent to those existing in more developed countries.…”

Section: Resultsmentioning

confidence: 97%

“…Four water samples (1 kg) were also stored in glass bottles fitted with inlet and outlet stopcocks, conducted up to the laboratory, and subjected to a technique for quantifying 222 Rn based on the emanation procedure [28] and consisting of the 1) removal of radon from the sample, 2) transfer of radon to a scintillation flask, and 3) detection of radon by scintillation counting. The purpose of this sampling was to compare radon concentration data obtained by different methods.…”

Section: Methodsmentioning

confidence: 99%

Health risk related to radon in a thermal spa utilizing waters from Guarani aquifer

Bonotto¹,

Santos²

2007

Environmental Health Risk IV

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This investigation was carried out within the Paraná sedimentary basin, Brazil, involved the sampling of groundwater and air, and was realized with the purpose of evaluating the radioactivity, due to radon gas, in a thermal spa utilizing the waters from Guarani (Botucatu-Pirambóia) aquifer. The results reported here provide additional information relative to that of previous studies focusing on the presence of radionuclides in the aquifer, which have mainly characterized those belonging to uranium and thorium series decay, such as the uranium isotopes ( 238 U and 234 U), radium isotopes ( The results obtained were compared with the maximum permissible concentration limits in air and drinking water defined by international standards, such as the guidelines for drinking water quality established by the World Health Organization. The possible processes responsible for the presence of radon in the aquifer were also considered in order to evaluate the data obtained.

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The use of isotopes in evolving groundwater circulation models of regional continental aquifers: The case of the Guarani Aquifer System

Kirchheim

Gastmans

Chang

et al. 2019

Hydrological Processes

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The Guarani Aquifer System (GAS) has been studied since the 1970s, a time frame that coincides with the advent of isotopic techniques in Brazil. The GAS isotope data from many studies are organized in different phases: (a) the advent of isotope techniques, (b) consolidation and new applications, (c) isotope assessments and hydrochemistry evolution, and (d) a roadmap to a new conceptual model. The reasons behind the phases, their methodological approaches, and impacts on the regional flow conceptual models are examined. Starting with local δ2H and δ18O assessments of values for water fingerprinting and estimates of recharge palaeoclimate scenarios, studies evolved to more integrated approaches based on multiple tracers. Stable isotope application techniques were consolidated during the 1980s, when new dating approaches dealing with radiogenic and heavy isotopes were introduced. Through the execution of an international transboundary project, the GAS was studied and extensively sampled for isotopes. These results have triggered wider application of isotope techniques, reflecting also world research trends. Presently, hydrochemical evolution models along flow lines from recharge to discharge areas, across large‐scale tectonic features within the entire sedimentary basin, are being combined with residence time estimates at GAS outcrop areas and deep confined units. In a complex system, it is normal that many, and even contradictory hypotheses are proposed, but isotope techniques provide a unique chance to test them. Stable isotope assessments are still needed near recharge areas, and they can be combined with groundwater classical dating procedures, complemented by newer techniques (3H‐3He, CFCs, and SF6). Recent noble gas sampling and world pioneer analytical efforts focused on the confined units in the GAS will certainly led to new findings on the overall GAS circulation. The objective of this article is to discuss how isotope information can contribute to the evolution of conceptual groundwater flow models for regional continental aquifers, such as the GAS.

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Radon in groundwaters from Guarany aquifer, South America: environmental and exploration implications

Cited by 48 publications

References 20 publications

Radon concentrations in ground and drinking water in the state of Chihuahua, Mexico

Radon concentrations in ground and drinking water in the state of Chihuahua, Mexico

Health risk related to radon in a thermal spa utilizing waters from Guarani aquifer

The use of isotopes in evolving groundwater circulation models of regional continental aquifers: The case of the Guarani Aquifer System

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