Analysis of radon depth profile in soil air after a rainfall by using diffusion model

Maeng, Seongjin; Han, Seung Yeon; Lee, Sang Hoon

doi:10.1016/j.net.2019.06.018

Cited by 17 publications

(6 citation statements)

References 7 publications

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“…As it is known that the flow of radon concentration is influenced by the water content in the soil, it is convenient to mention the water conditions present at Kilbourne Hole during the measurements. Since the radon diffusion coefficient decreases as the water content increases [ 19 , 20 , 21 ], the presence of water in the soil would indicate that our measurements correspond to a lower bound. However, the dates of the measurements, October 2020 to February 2021, correspond to the low-rain season, which has a peak between June and September, and no rain was observed in the area on those dates.…”

Section: Discussionmentioning

confidence: 99%

Radon at Kilbourne Hole Maar and Magnetic and Gravimetric Correlations

Luna-Lucero

Sajó-Bohus

López

2023

IJERPH

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Soil radon gas concentrations ranging from the detection limit up to 15 kBq/m3 were measured for the first time at the Kilbourne Hole maar in two selected regions: the first region was located on the western volcanic field, and the second was located inside the crater, near the southern border. Radioactive anomalies were found in association with the pyroclastic deposit, and the corresponding heat map provided information on the radon diffusion direction by the CRn gradient. It was observed for the first time that the anomalies found at the southern border are associated with a known geological fault, in opposition to what was found on the western border. The results provided by a radon activity concentration gradient of above (8 kBq/m3)/15 m suggest the existence of a fault that has not been detected yet. The observation that high levels near a dormant fault are related to tectonically enhanced radon was confirmed. The activity concentrations of Rn-gas were contrasted to existing gravimetric and magnetic data to provide measuring information on radon emanation, suggesting the existence of a high, naturally occurring radioactivity in the soil in the first place or an increased porosity of the locally defined lithology. The results indicated a higher correlation of 85% with magnetic anomalies. This is in opposition to the gravimetric data, which was only 30%. This study is a contribution to the characterization maar of volcanic geology by the soil radon activity index, which was designated as “low” in this case.

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Section: Discussionmentioning

confidence: 99%

Radon at Kilbourne Hole Maar and Magnetic and Gravimetric Correlations

Luna-Lucero

Sajó-Bohus

López

2023

IJERPH

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“…They then measured soil radon gas using a purge-sniff-grab procedure consistent with the instrument manufacturer's instructions. Soil gas radon has long been known to vary with respect to location, depth, and soil moisture conditions [25][26][27][28]; our measurements during each of the two testing periods represent snapshots of conditions at those depths and locations.…”

Section: Methods To Measure or Estimate Exposures And Covariatesmentioning

confidence: 99%

Geologic, seasonal, and atmospheric predictors of indoor home radon values

Hahn

Haneberg

Stanifer

et al. 2023

Environ. Res.: Health

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Exposure to tobacco smoke and radon cause lung cancer. Radioactive decay of naturally occurring uranium in bedrock produces radon. Seasonality, bedrock type, age of home, and topography have been associated with indoor radon, but the research is mixed. The study objective was to examine the relationships of geologic (soil radon and bedrock) and seasonal (warm and cold times of the year) factors with indoor home radon values in citizen scientists’ homes over time, controlling for atmospheric conditions, topography, age of home, and home exposure to tobacco smoke. We collected and analyzed indoor radon values, soil radon gas concentrations, and dwelling- and county-level geologic and atmospheric conditions on 66 properties in four rural counties during two seasons: 1) summer 2021 (n = 53); and 2) winter/spring 2022 (n = 52). Citizen scientists measured indoor radon using Airthings radon sensors, and outdoor temperature and rainfall. Geologists obtained soil radon measurements using RAD7 instruments at two locations (near the dwelling and farther away) at each dwelling, testing for associations of indoor radon values with soil values, bedrock type, topography, and atmospheric conditions. Bedrock type, near soil radon levels, home age, and barometric pressure were associated with indoor radon. Dwellings built on carbonate bedrock had indoor radon values that were 2.8 pCi/L (103.6 Bq/m3) higher, on average, compared to homes built on siliclastic rock. Homes with higher near soil radon and those built < 40 ago were more likely to have indoor radon > 4.0 pCi/L (148 Bq/m3). With higher atmospheric barometric pressure during testing, observed indoor radon values were lower. Seasonality and topography were not associated with indoor radon level. Understanding relationships among bedrock type, soil radon, and indoor radon exposure allows the development of practical predictive models that may support pre-construction forecasting of indoor radon potential based on geologic factors.

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“…This is very helpful for one who can investigate the factors affecting radon concentration with time. When radon is deposited on the surface of the detector, they radiate alpha particles of special energy immediately into the solid state detector (16)(17)(18) . Electrical signal is created by the detector, and then by electronic circuit this signal converts to digital form.…”

Section: Methods Of Samplingmentioning

confidence: 99%

“…Short-lived progenies of radon are responsible for the main contribution to the human exposure and one can obtain it by variety of methods (15)(16) The concentration of indoor radon is converted into the Equilibrium Equivalent Radon Concentration (EEC) using equation 4 (18) which is further converted into Potential Alpha Energy concentration (PAE) using equation 5 (18) . Where 1 WL (Working Level) was known as the concentration of potential alpha energy related with the radon progeny in equilibrium with 3700 Bq m -3 and equal to 2.08 x 10 -5 J m -3 ) (19) .…”

Section: Dose Assessmentmentioning

confidence: 99%

Estimation of indoor radon concentration and dose evaluation of radon and its progeny in selected dwellings in Duhok city, Kurdistan Region, Iraq

Alhamdi

Abdullah²

2022

Int J Radiat Res

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Background: Among the natural radioactive sources, two-thirds of radiation dose received by living tissue is caused by radon and its progeny because it can interact with biological tissue when it is inhaled or ingested. Accordingly, this study planned to measure indoor radon and evaluates its doses in addition to studying metrological parameter to understand the correlation between them. Materials and Methods: This study focused on the indoor radon concentration by two different protocols which are short term and long term. In short term, radon concentration was measured in seven dwellings in Duhok city at the beginning of both winter and summer using RAD7 detector and Airthings Corentium monitor. Then annual effective dose of radon and its decay product to the inhabitance were estimated. In long term protocol, radon concentration was measured continually for one year by fixing Corentoum detector in one building. Results: outcomes showed that the concentration of radon is higher in winter than summer; with range of 1-56 Bq m -3 . The average level of indoor radon concentration in both seasons was 19 ± 6.1 Bq m -3 . The radon and its progeny average annual effective dose were 0.59 ± 0.17 and 0.23 ± 0.14 mSv y -1 in winter and 0.37 and 0.15 mSv y -1 in summer respectively. Conclusion: The results of average indoor radon concentration obtained were considerably less than the action levels prescribed by ICRP. Also, the results indicated that radon concentration negatively correlated with wind speed and positively with outdoor temperature while outdoor humidity effect has almost neglected.

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Analysis of radon depth profile in soil air after a rainfall by using diffusion model

Cited by 17 publications

References 7 publications

Radon at Kilbourne Hole Maar and Magnetic and Gravimetric Correlations

Radon at Kilbourne Hole Maar and Magnetic and Gravimetric Correlations

Geologic, seasonal, and atmospheric predictors of indoor home radon values

Estimation of indoor radon concentration and dose evaluation of radon and its progeny in selected dwellings in Duhok city, Kurdistan Region, Iraq

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