Radon exhalation and transfer processes in aqueous media

Elmaghraby, Elsayed K.; Ataalla, Nahla N; Afifi, Mohamed Bahaaeldin; Salem, Eman

doi:10.1140/epjp/s13360-021-02231-z

Cited by 4 publications

(2 citation statements)

References 47 publications

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“…Many previous studies from comparable settings applied fresh groundwater radon data from inland wells for C GW . This can be problematic as groundwater, even in apparently monolithologic aquifer regimes, can exhibit vast concentration gradients [45,46] due to various factors including aquifer porosity, texture, and excess air content [47]. More importantly, SGD dominated by tidally recirculated seawater tends to exhibit significantly lower radon concentrations than fresh groundwater [25,46,48], but still significantly higher values than seawater, e.g., [48] due to radon emanation from beach sediments in the tidal wedge and mixing with high radon saline groundwater from the transitional zone at the base of the freshwater lens.…”

Section: Definition Of Groundwater Radon End-membermentioning

confidence: 99%

Radon and Salinity Mass Balance Constraints on Groundwater Recharge on a Semi-Arid Island (Catalina, California)

Hagedorn

Tsuda

2022

Water

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Quantifying the freshwater component of submarine groundwater discharge (SGD) is critical in the analysis of terrestrial influences on marine ecosystems and in assessing the water budget and groundwater recharge of coastal aquifers. In semi-arid to arid settings, this quantification is difficult because low SGD rates translate into low concentrations of groundwater solutes in coastal waters. In this study, fresh SGD (FSGD) was quantified for Toyon Bay on Catalina Island, California, for wet and dry seasons using a combination of radon and salinity mass balance models, and the results were compared to watershed-specific groundwater recharge rates obtained from soil water balance (SWB) modeling. Calculated FSGD rates vary only slightly with season and are remarkably similar to the recharge estimates from the SWB model. While sensitivity analyses revealed FSGD estimates to be significantly influenced by uncertainties in geochemical variability of the groundwater end-member and fluctuations of water depth, the results of this study support the SWB-model-based recharge rates. The findings of this study highlight the utility of the radon-and-salinity-mass-balance-based FSGD estimates as groundwater recharge calibration targets, which may aid in establishing more refined sustainable groundwater yields.

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Section: Definition Of Groundwater Radon End-membermentioning

confidence: 99%

Radon and Salinity Mass Balance Constraints on Groundwater Recharge on a Semi-Arid Island (Catalina, California)

Hagedorn

Tsuda

2022

Water

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“…Liang et al [3] investigated how the soil properties of CSL change during drying-wetting cycles and found that the soil's apparent porosity increases and the soil integrity undergoes dynamic recombination before reaching a steady state. Elmaghraby et al [4] demonstrated that the measurement of radon in water is affected by complex factors related to the redissolution of radon progeny, which is nonhomogeneous and depends on the properties and geometry of the solution and the presence of carrier gases like helium and water vapor. This produces serious radioactive contamination of soil, surface water, and groundwater, which directly or indirectly threatens the living environment of human beings and restricts the sustainable development of the economy and society.…”

Section: Introductionmentioning

confidence: 99%

Fuzzy Optimal Control of Radon Exhalation in Uranium Tailings under Double-Layer Coverage

Zhang

Jian-yong

2023

International Journal of Energy Research

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The use of covering material is an important measure to control the radon migration of uranium tailings. Radon diffusion and migration are affected by cover layer parameters, such as diffusion coefficient, overburden thickness, particle size, and ore body width. The radon reduction effect of single-layer mulching is often less than that of double-layer, and the material parameters of the cover layer are uncertain; however, they can be explained by a fuzzy dynamic equation. Firstly, the radon exhalation model is constructed with the radon percolation diffusion and migration method in a double-layer covering. Secondly, a fuzzy target of radon exhalation and a fuzzy constraint model are constructed subject to the total cost and thickness of covering material by a triangular membership function. Lastly, the models are aimed at solving the corresponding extreme value interval of the fuzzy target of radon exhalation by immune genetic algorithm, to reconstruct the fuzzy target, fuzzy constraint, and fuzzy aggregation function, where, ultimately, the optimal radon control decision can be obtained by swarm intelligence algorithm subject to different levels between possibility and importance. An example demonstrates a database of optimal decision-making schemes for double-layer coverage, and flexible management of radioactive pollutants is realized.

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Isotope signature and elemental characteristics of subsurface formations around deep-laying coal seams probed by means of atomic and nuclear-based techniques

et al. 2022

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Radon exhalation and transfer processes in aqueous media

Cited by 4 publications

References 47 publications

Radon and Salinity Mass Balance Constraints on Groundwater Recharge on a Semi-Arid Island (Catalina, California)

Radon and Salinity Mass Balance Constraints on Groundwater Recharge on a Semi-Arid Island (Catalina, California)

Fuzzy Optimal Control of Radon Exhalation in Uranium Tailings under Double-Layer Coverage

Isotope signature and elemental characteristics of subsurface formations around deep-laying coal seams probed by means of atomic and nuclear-based techniques

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