Thickness of radon emitting layer in building materials

Corrêa, Janine Nicolosi; Silva, A.C.M.; Paschuk, S.A.; Barreto, Rafael Carvalho; Denyak, V.; Schelin, H.R.; Narloch, Danielle Cristine; Hashimoto, Yasunori; Martin, Aline Cristina

doi:10.1016/j.radphyschem.2020.108786

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…Construction materials with a rich uranium content are considered potential radon gas emitters [104][105][106]. In addition, parameters such as the amount of radium in the materials, the height of the building, and the permeability of the ground of the building are among the factors affecting the radon gas level [107,108].…”

Section: Radon From Construction Materialsmentioning

confidence: 99%

Radon, Concrete, Buildings and Human Health—A Review Study

Bulut,

Şahin

2024

Buildings

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A comprehensive evaluation of the results obtained according to the measurement of radon gas in buildings and concrete, which is the most consumed material in the world after water, in accessible studies carried out in the last 40 years is the main objective of this study. The paper additionally aims to address the gap in the literature by comparatively determining which parameters affect radon–concrete and radon–building relationships. The scientific knowledge compiled within the scope of this article was presented under the main headings of radon and radon gas measurements in concrete and buildings. Radon gas, also known as the “invisible killer”, is considered the second most important cause of lung cancer after smoking (the gas is responsible for 3–14% of lung cancer cases in the world). The results determined that radon concentration limits have been applied in the range of 100–400 Bqm−3 in houses and 100–3700 Bqm−3 in workplaces. Studies conducted on the exhalation rate of radon showed that the radon exhalation rate of concrete may be in the range of 0.23–510 Bqm−2 h−1. The results of indoor radon concentration measurements revealed that values between 4.6 Bqm−3 and 583 Bqm−3 were obtained. Despite the existing literature, some researchers state that there is an urgent need for an improved and widely accepted protocol based on reliable measurement techniques to standardize measurements of the radon exhalation rate of construction materials and the indoor radon concentration of buildings.

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Section: Radon From Construction Materialsmentioning

confidence: 99%

Radon, Concrete, Buildings and Human Health—A Review Study

Bulut,

Şahin

2024

Buildings

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“…Because Rn-222 tends to diffuse through a specific material before reaching the atmosphere, Sahu et al [8] covered mill tailings with nonradioactive materials and measured the Rn-222 surface and mass exhalation rates using a smart radon monitor system and an underground uranium accumulation chamber. Correa et al [9] determined the optimal thickness for measuring radon exhalation in cement mortar used in construction, finding that radon activity increases linearly with thickness in samples containing radioactive sand until a stability plateau is reached at larger thicknesses. Ye et al [10] developed a mathematical model for radon migration and revealed that an increase in radon diffusion coefficient results in higher radon exhalation rates from the covering layer in both finite and semi-infinite emanation media.…”

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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“…One of the proposed solutions providing protection against the effects of radon migration and its increased exhalation in enclosed spaces is insulating and increasing air tightness by reducing porosity and permeability of building construction and materials [44][45][46][47][48][49][50][51][52][53][54][55][56][57]. In underground facilities both the ground, the roof and side walls of a given space should be insulated.…”

Section: Introductionmentioning

confidence: 99%

The assessment of lining structure impact on radon behaviour inside selected underground workings under the cour d’honneur of Książ castle

Fijałkowska-Lichwa¹

2020

J Radioanal Nucl Chem

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The results based on 2-year long measurements 01 Jan. 2016–2031 Dec. 2017 have been used for discussing the influence of tunnel lining on the size of 222Rn activity concentration and the impact of the employed rock mass insulation on natural convective air exchange. In April, air movement started when the temperature was at least 7 °C lower than the mean inside. Between May and October, an increase to 9 °C above the underground temperature resulted in an increase of radon concentration. An unconstrained convection process did not start until November and it continued until the end of March. The reinforced concrete lining insulated the fractured and absorptive rock mass. The roof and the sidewall lining had little impact on air movement process.

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Thickness of radon emitting layer in building materials

Cited by 4 publications

References 6 publications

Radon, Concrete, Buildings and Human Health—A Review Study

Radon, Concrete, Buildings and Human Health—A Review Study

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

The assessment of lining structure impact on radon behaviour inside selected underground workings under the cour d’honneur of Książ castle

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