Radon concentration in soil gas and radon exhalation rate at the Ravne Fault in NW Slovenia

Vaupotič, Janja; Gregorič, Asta; Kobal, I.; Žvab, P.; Kozak, Krzysztof; Mazur, Jadwiga; Kochowska, Elżbieta; Grządziel, Dominik

doi:10.5194/nhess-10-895-2010

Cited by 67 publications

(33 citation statements)

References 11 publications

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“…The air trapped inside the chamber was circulated in a closed circuit for about 90 min, and the concentration of radon accumulated in the chamber was recorded every 10 min. The radon flux was determined from the slope of the straight line fitted to individual readings (Mazur, 2008;Vaupotič et al, 2010). A special device was constructed which enabled automatic movement of the exhalation chamber, down to the ground for radon flux measurement and up for ventilation of the system (Mazur, 2008 Fig.…”

Section: Measurements Of Surface 222 Rn Fluxes Using the Chamber Methodsmentioning

confidence: 99%

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Factors controlling temporal variability of near-ground atmospheric <sup>222</sup>Rn concentration over central Europe

et al. 2014

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Abstract. Concentration of radon (222Rn) in the near-ground atmosphere has been measured quasi-continuously from January 2005 to December 2009 at two continental sites in Europe: Heidelberg (south-west Germany) and Krakow (southern Poland). The atmosphere was sampled at ca. 30 and 20 m above the local ground. Both stations were equipped with identical instruments. Regular observations of 222Rn were supplemented by measurements of surface fluxes of this gas in the Krakow urban area, using two different approaches. The measured concentrations of 222Rn varied at both sites in a wide range, from less than 2.0 Bq m−3 to approximately 40 Bq m−3 in Krakow and 35 Bq m−3 in Heidelberg. The mean 222Rn content in Krakow, when averaged over the entire observation period, was 30% higher than in Heidelberg (5.86 ± 0.09 and 4.50 ± 0.07 Bq m−3, respectively). Distinct seasonality of 222Rn signal is visible in the obtained time series of 222Rn concentration, with higher values recorded generally during late summer and autumn. The surface 222Rn fluxes measured in Krakow also revealed a distinct seasonality, with broad maximum observed during summer and early autumn and minimum during the winter. When averaged over a 5-year observation period, the night-time surface 222Rn flux was equal to 46.8 ± 2.4 Bq m−2 h−1. Although the atmospheric 222Rn levels at Heidelberg and Krakow appeared to be controlled primarily by local factors, it was possible to evaluate the "continental effect" in atmospheric 222Rn content between both sites, related to gradual build-up of 222Rn concentration in the air masses travelling between Heidelberg and Krakow. The mean value of this build-up was equal to 0.78 ± 0.12 Bq m−3. The measured minimum 222Rn concentrations at both sites and the difference between them was interpreted in the framework of a simple box model coupled with HYSPLIT (Hybrid Single Particle Lagrangian Integrated Trajectory) analysis of air mass trajectories. The best fit of experimental data was obtained for the mean 222Rn flux over the European continent equal to 52 Bq m−2 h−1, the mean transport velocity of the air masses within the convective mixed layer of the planetary boundary layer (PBL) on their route from the Atlantic coast to Heidelberg and Krakow equal to 3.5 m s−1, the mean rate constant of 222Rn removal across the top of the PBL equal to the 222Rn decay constant and the mean height of the convective mixed layer equal to 1600 m.

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Section: Measurements Of Surface 222 Rn Fluxes Using the Chamber Methodsmentioning

confidence: 99%

“…First measurements of atmospheric 222 Rn were performed in the late 1920s (Wigand and Wenk, 1928). A recent summary by Zhang et al (2011) identifies 41 stations worldwide where 222 Rn was measured regularly for periods longer that 1 year (USA -8; Europe -19; Asia -12; South America, Australia, Africa -5; remote ocean and polar regions -7).…”

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confidence: 99%

Factors controlling temporal variability of near-ground atmospheric <sup>222</sup>Rn concentration over central Europe

et al. 2014

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“…The air was circulated in the closed circuit until saturation was achieved in radon concentration, while radon accumulated was recorded every 10 min. The exhalation rate was calculated using the following expression [15]:…”

Section: Experimental Set-up and Methods Of Measurementmentioning

confidence: 99%

In situmeasurements of radon levels in water and soil and exhalation rate in areas of Malwa belt of Punjab (India)

Kumar

Singh

Bajwa

et al. 2011

Isotopes in Environmental and Health Studies

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Radon concentration levels in water and soil gas from 36 locations pertaining to some areas of Malwa region of Punjab have been measured on an in situ basis using a continuous active radon detector (AlphaGuard, Model - PQ 2000 PRO, Genitron instruments, Germany). Exhalation rate measurements have also been carried out at these places, using a closed-circuit technique. The radon concentrations in soil and water varied from 1.9 to 16.4 kBq m(-3) and 5.01 to 11.6 kBq m(-3), respectively. The exhalation rate (E (Rn)) ranged between 7.48 and 35.88 mBq m(-2) s(-1) with an average value of 18.17 mBq m(-2) s(-1). Annual dose rates have been calculated for water radon concentrations. The minimum to maximum values of dose rates were found to be 13.42-31.08 μSv y(-1). The recorded values of radon concentration in water are within the safe limit of 11 Bq l(-1) recommended by the US Environment Protection Agency [National Research Council, Risk Assessment of Radon in Drinking Water (Academy Press, Washington, DC, USA, 1999)]. All measurements were made in similar climatic and environmental conditions to ensure minimal variations in meteorological parameters. An intermediate correlation coefficient (0.5) was observed between radon exhalation rates and soil gas values.

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“…originates from radioactive transformation of 226 Ra in the 238 U decay chain in the earth's crust [11]. The assessment of radiological risk related to inhalation of radon and radon progeny is based mainly on the integrated measurement of radon in both indoor and outdoor environments.…”

Section: International Journal Of Advance Engineering and Research Dementioning

confidence: 99%

Effect of Plastering and Paints on the Radon Exhalation Rate and Radiation Doses From Fired Bricks.

2016

IJAERD

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Abstract:In order to investigate the effect of paints available in the market on the radon exhalation rate from building materials, several bricks were collected. These bricks were plastered with a mixture of cement and sand. Before measurements bricks were dried for 24 hours. These plastered bricks were then coated with white wash and again dried for 1-2 hours. After drying the bricks were coated with different brands and colors of paints. Radon exhalation rates measurements were carried out for these painted bricks through sealed can technique II using LR-115 type II detectors.Radon

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Radon concentration in soil gas and radon exhalation rate at the Ravne Fault in NW Slovenia

Cited by 67 publications

References 11 publications

Factors controlling temporal variability of near-ground atmospheric <sup>222</sup>Rn concentration over central Europe

Factors controlling temporal variability of near-ground atmospheric <sup>222</sup>Rn concentration over central Europe

In situmeasurements of radon levels in water and soil and exhalation rate in areas of Malwa belt of Punjab (India)

Effect of Plastering and Paints on the Radon Exhalation Rate and Radiation Doses From Fired Bricks.

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Radon concentration in soil gas and radon exhalation rate at the Ravne Fault in NW Slovenia

Cited by 67 publications

References 11 publications

Factors controlling temporal variability of near-ground atmospheric &lt;sup&gt;222&lt;/sup&gt;Rn concentration over central Europe

Factors controlling temporal variability of near-ground atmospheric &lt;sup&gt;222&lt;/sup&gt;Rn concentration over central Europe

In situmeasurements of radon levels in water and soil and exhalation rate in areas of Malwa belt of Punjab (India)

Effect of Plastering and Paints on the Radon Exhalation Rate and Radiation Doses From Fired Bricks.

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Factors controlling temporal variability of near-ground atmospheric <sup>222</sup>Rn concentration over central Europe

Factors controlling temporal variability of near-ground atmospheric <sup>222</sup>Rn concentration over central Europe