Physical and geometrical parameters controlling measurements of radon emanation and exhalation from soil

Saad, A.F.; Abdallah, R.M.; Hussein, N.A.

doi:10.1016/j.apradiso.2018.03.022

Cited by 17 publications

(4 citation statements)

References 22 publications

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“…However, radon can come from very deep sources, about 100 m [24].This is due to convection transport: radon is driven by interstitial fluids, moving in fractures and micro fractures of the soil. This convection transport is governed by Darcy's law [23], as given in (2). The diffused radon flux per unit area due to diffusion (1) and convection (2) can therefore be expressed by (3).…”

Section: Theorymentioning

confidence: 99%

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Finite-Difference Time-Domain Simulations of Radon Transport in Porous Media

et al. 2020

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Section: Theorymentioning

confidence: 99%

“…Radon from soil and rocks is released into the atmosphere and becomes the most important factor influencing exposure to naturally-occurring radiation [1,2]. More than 80 % of the radon emitted into the atmosphere comes from soil and rocks on the surface of the earth [3].…”

Section: Introduction mentioning

confidence: 99%

Finite-Difference Time-Domain Simulations of Radon Transport in Porous Media

et al. 2020

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“…Radon is a natural gas produced by the radioactive decay of uranium from subsurface rocks. It is released into the atmosphere and becomes the most critical factor for exposure to natural radiation [1,2]. More than 80 % of the radon emitted into the atmosphere comes from soil and rocks on the surface of the earth [3].…”

Section: Introduction mentioning

confidence: 99%

Radon Concentration in Urban Areas in the North and West of Morocco

Tayebi,

El-Maghraoui,

Tayebi

et al. 2023

Atom Indo.

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Radon is a colorless, odorless radioactive gas produced by the decay of uranium and radium. It is the second cause of cancer of the lungs after smoking. It has been present in Earth's crust since the creation of Earth. Uranium-rich rocks in the deep crust are the main source of radon. Its emanation from the ground surface varies from one point to another depending on the physical characteristics of the terrain crossed as observed in this study between North and West Morocco. A dosimetric study of those emanations was performed by using the LR-115 solid-state nuclear track detector (SSNTD) which was subsequently processed by techniques developed and calibrated in the laboratory. The study revealed high concentrations of this gas in confined spaces at ground level and, in particular, in basements and less-ventilated ground floor rooms. In order to reduce these concentrations of radon and the probability of carcinogenic attacks by these accumulations of this gas, it is recommended to ventilate these premises well. Good air circulation allows the removal of this harmful gas.

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“…Radon ( 222 Rn), a radioactive inert gas with a half-life of 3.82 d, is generated from alpha decay of radium ( 226 Ra), which is an intermediate of decay of uranium ( 238 U) and thorium ( 232 Th) in the soils and rocks [1,2]. Radon gas is released into the atmosphere from ground through its diffusion in the pore spaces in soils [3] and it significantly contributes to elevate indoor radon gas concentration through the some mechanisms including convection via cracks and openings, diffusion from soil via the pore space of building materials and emanation from building materials [4].…”

Section: Introductionmentioning

confidence: 99%

Effects of radon on soil microbial community and their growth

Lee

Park

Kim

2019

Environmental Engineering Research

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The aim of this study was to estimate the microbial metabolic activity of indigenous soil microbes under the radon exposure with different intensity and times in the secured laboratory radon chamber. For this purpose, the soil microbes were collected from radon-contaminated site located in the G county, Korea. Thereafter, their metabolic activity was determined after the radon exposure of varying radon concentrations of 185, 1,400 and 14,000 Bq/m 3 . The average depth variable concentrations of soil radon in the radon-contaminated site were 707, 860 and 1,185 Bq/m 3 from 0, 15, and 30 cm in deep, respectively. Simultaneously, the soil microbial culture was mainly composed of Bacillus sp., Brevibacillus sp., Lysinibacillus sp., and Paenibacillus sp. From the radon exposure test, higher or lower radiation intensities compared to the threshold level attributed the metabolic activity of mixed microbial consortium to be reduced, whereas the moderate radiation intensity (i.e. threshold level) induced it to the pinnacle point. It was decided that radon radiation could instigate the microbial metabolic activity depending on the radon levels while they were exposed, which could consequently address that the certain extent of threshold concentration present in the ecosystem relevant to microbial diversity and population density to be more proliferated.

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Physical and geometrical parameters controlling measurements of radon emanation and exhalation from soil

Cited by 17 publications

References 22 publications

Finite-Difference Time-Domain Simulations of Radon Transport in Porous Media

Finite-Difference Time-Domain Simulations of Radon Transport in Porous Media

Radon Concentration in Urban Areas in the North and West of Morocco

Effects of radon on soil microbial community and their growth

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