Measurements of 222Rn activity in well water of the Curitiba metropolitan area (Brazil)

Corrêa, Janine Nicolosi; Paschuk, S.A.; Kappke, Jaqueline; Perna, Allan Felipe Nunes; França, Alana Caroline; Schelin, H.R.; Denyak, V.

doi:10.1016/j.radphyschem.2014.01.006

Cited by 26 publications

(9 citation statements)

References 9 publications

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“…To determine if part of the radon in the water sample is generated from 226 Ra, which could be dissolved in the own sample [13], a part of each water sample has been stored in their glass containers in order to re-measure the radon content after the time required for 226 Ra to reach secular equilibrium with its progeny.…”

Section: Equipment Setupmentioning

confidence: 99%

“…Radon is a very mobile gas and it can escape from water with ease during the process of sampling and transportation, hence careful sample preparation is necessary. Several procedures can be found in the literature to perform measurements of radon in groundwater using different techniques such as Lucas-cell, ionization chambers, solid-state detector, or gamma spectrometry [12][13][14][15][16]. The aim of this study was to measure radon concentration in groundwater at most populated zone of Gran Canaria as a starting point for monitoring of the quality of groundwater with respect to radon gas in the whole territory as well as making a first attempt at using this gas as a tracer to establish dynamic knowledge of groundwater flow in Gran Canaria.…”

Section: Introductionmentioning

confidence: 99%

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Radon in Groundwater of the Northeastern Gran Canaria Aquifer

Aguilera

Cruz-Fuentes

Rubiano

et al. 2015

Water

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Abstract:222 Rn has been detected in 28 groundwater samples from the northeast of Gran Canaria (Canary Islands, Spain) utilizing a closed loop system consisting of an AlphaGUARD monitor that measures radon activity concentration in the air by means of an ionization chamber, and an AquaKIT set that transfers dissolved radon in the water samples to the air within the circuit. Radon concentration in the water samples studied varies between 0.3 and 76.9 Bq/L. Spanish radiological protection regulations limit the concentration of 222 Rn for drinking water to 100 Bq/L, therefore the values obtained for all the analyzed samples are below this threshold. The hydrogeological study reveals a significant correspondence between the radon activity concentration and the material characteristics of the aquifer. For a selected group of samples with high radon concentrations, gross alpha activity has been determined to have values higher than the prescriptive screening level (0.1 Bq/L).

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Section: Equipment Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radon in Groundwater of the Northeastern Gran Canaria Aquifer

Aguilera

Cruz-Fuentes

Rubiano

et al. 2015

Water

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“…The exhalation rate is the flux density in the surface of the material. Once the gas can accumulate inside dwellings, it is necessary to determinate the indoor radon-222 activity [11][12][13][14][15], its exhalation from soil [16][17][18][19][20], building materials [21][22][23][24][25][26][27], and objects rich in radium-226 from private and museum collections [28][29][30]. There are several different techniques to determine the emanation factor and the effective radium-226 activity from radon-222 exhalation [18,25,[31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Determining radium-226 concentration from radon-222 emanation in building materials: a theoretical model

Barreto¹,

Perna²,

Narloch³

et al. 2019

Braz. J. Rad. Sci.

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It was developed an improved theoretical model capable to estimate the radium concentration in building materials solely measuring the radon-222 concentration in a confined atmosphere.This non-destructive technique is not limited by the size of the samples, and it intrinsically includes back diffusion.The resulting equation provides the exact solution for the concentration of radon-222 as a function of time and distance in one dimension.The effective concentration of radium-226 is a fit parameter of this equation.In order to reduce its complexity, this equation was simplified considering two cases:low diffusion in the building material compared to the air, anda building material initially saturated with radon-222.These simplified versions of the exact one dimension solution were used to fit experimental data.Radon-222 concentration was continuously measured for twelve days with an AlphaGUARD detector, located at the Laboratory of Applied Nuclear Physics at Universidade Tecnologica Federal do Parana (UTFPR).This model was applied to two different materials: cement mortar and concrete, which results were respectively (15.7 +- 8.3) Bq/kg and (10.5 +- 2.4) Bq/kg for the radium-226 effective concentration.This estimation was confronted with the direct measurements of radium in the same materials (same sources) using gamma-ray spectrometry, fulfilled at Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), which results were respectively (13.81 +- 0.23) Bq/kg and (12.61 +- 0.22) Bq/kg.

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“…Radon is a very mobile gas and it can escape from water with ease during the process of sampling and transportation, hence careful sample preparation is necessary [27]. Several procedures can be found in the literature to perform measurements of radon in groundwater using different techniques such as Lucaas-cell, ionization chambers, solidstate detector, or gamma spectrometry ( [10], [11], [12], [13], [14]). The aim of this study was to measure radon concentration in well water from different locations in Idah and its environs and evaluate the annual effective dose by ingestion from the radon concentrations so measured for the locations.…”

Section: Introductionmentioning

confidence: 99%

Annual Effective Dose of Radon-222 in Well Water Samples in Male Adults: Idah, Nigeria

Gyuk¹,

Aruwa²,

Dogara³

et al. 2017

AJOP

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A total of 25 well water samples from various locations of Idah and environs including Ofukolo, Ega, EdeAdejo, and Ede -Alaba, have been investigated for their 222 Rn concentrations using liquid scintillation counter manufactured by Packard Instrument Company. The concentration of 222 Rn in the well water samples was found to vary in the range 3.0±2.00 -18.24±1.50 Bq/L and a mean concentration of 9.64 Bq/L with An average mean concentration of 10.23 Bq/L recorded respectively. The results showed that 222 Rn concentration in well water sources were greater than the maximum concentration limit (MCL) of 11.1Bq/L set by USEPA and 10.0 Bq/L set by WHO. The annual effective dose by ingestion for adult male was found to be in the range 0.0198 mSv/y to 0.1198 mSv/yand an average of 0.0721 mSv/y which are lower than the annually received effective dose as set by ICRP.

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Measurements of 222Rn activity in well water of the Curitiba metropolitan area (Brazil)

Cited by 26 publications

References 9 publications

Radon in Groundwater of the Northeastern Gran Canaria Aquifer

Radon in Groundwater of the Northeastern Gran Canaria Aquifer

Determining radium-226 concentration from radon-222 emanation in building materials: a theoretical model

Annual Effective Dose of Radon-222 in Well Water Samples in Male Adults: Idah, Nigeria

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