Radon decay products equilibrium at different aerosol concentrations

Mostafa, Mostafa; Khalaf, Hyam Nazmy Bader; Zhukovsky, Michael

doi:10.1016/j.apradiso.2019.108981

Cited by 10 publications

(5 citation statements)

References 26 publications

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“…As reviewed by Porstendörfer and Reineking [14], f u RnP differs substantially from place to place, and depending on the environmental conditions, its value ranges from 0.006 to 0.83. Generally, it is inversely proportional to the number concentration of aerosol particles [75][76][77][78], the relationship being approximated by Papastefanou [18], Porstendörfer [74], and Huet et al [79]:…”

Section: Fundamentals Of Radon and Thoron Productsmentioning

confidence: 99%

Radon and Its Short-Lived Products in Indoor Air: Present Status and Perspectives

Vaupotič

2024

Sustainability

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Initially, basic equations are given to express the activity concentrations and concentrations of potential α-energies of radon (222Rn) and thoron (220Tn) and their short-lived products in indoor air. The appearance of short-lived products as a radioactive aerosol is shown, and the fraction of the unattached products is particularly exposed, a key datum in radon dosimetry. This fundamental part is followed by giving the sources of radon and thoron indoors, and thus, their products, and displaying the dependence of their levels on the ground characteristics, building material and practice, and living–working habits of residents. Substantial hourly, daily, and seasonal changes in their activity concentrations are reviewed, as influenced by meteorological parameters (air temperature, pressure, humidity, and wind speed) and human activity (either by ventilation, air conditioning and air filtration, or by generating aerosol particles). The role of the aerosol particle concentration and their size distribution in the dynamics of radon products in indoor air has been elucidated, focusing on the fraction of unattached products. Intensifying combined monitoring of radon short-lived products and background aerosol would improve radon dosimetry approaches in field and laboratory experiments. A profound knowledge of the influence of meteorological parameters and human activities on the dynamics of the behaviour of radon and thoron accompanied by their products in the air is a prerequisite to managing sustainable indoor air quality and human health.

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Section: Fundamentals Of Radon and Thoron Productsmentioning

confidence: 99%

Radon and Its Short-Lived Products in Indoor Air: Present Status and Perspectives

Vaupotič

2024

Sustainability

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“…The crude was considered 100 % concentration of the extract for both ethanol and water. The concentrations of 75%, 50%, and 25% were produced by mixing with appropriate quantities of distilled water [15]. The discs were also soaked in ethanol, sterile water, and ciprofloxacin.…”

Section: Extraction Of the Bioactive Compoundsmentioning

confidence: 99%

Mineral Profiling and Antimicrobial Effects of the West Indian Cherry (Malpighia emarginata DC.) Fruit Extracts Against Selected Pathogenic Bacteria

October,

Ansari,

Jaikishun

et al. 2024

JAMB

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Bioactive compounds are found throughout the cherry fruit and these compounds give the fruits their antimicrobial properties. The objective of this study was to determine the mineral profile of M. emarginata for four maturity stages. The mineral potassium (K), phosphorus (P), and magnesium (Mg) content was evaluated by spectrophotometry. The highest amount of K was found in the half-green (HG) stage and the lowest in the full-ripe (FR). The highest concertation of P and Mg was found in the full-green (FG) stage and the lowest in the full-ripe. For P, there was an increase from the FG to the HG maturity stage, then the concentration declined until maturity, as it related to the concentration of Mg and K, there was a decline in the concentration as the fruit progressed maturity. Additionally, the antibacterial activity of the fruit extract was conducted on E. coli and S. aureus using the Kirby Bauer disc diffusion method at different concentrations of plant extracts. The ethanolic extracts (EE) (zone of inhibition 13.4 ± 1.9 to 21.8 ± 0.6) showed more antimicrobial activity than the aqueous extract (AE) with zones of inhibition diameters (mm) which ranged from 0 ± 0 to 18.2 ± 0.8. Both AE and EE were effective against S. aureus bacteria strain except the AE (crude) which had no zone of inhibition. All tested microorganisms were susceptible to the antibiotic ciprofloxacin. This study suggests that other types of solvents were used to investigate the antibacterial activities of the M. emarginata extract on a wider array of bacteria as the fruit demonstrated antimicrobial properties.

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“…Uranium (U-238) is a chemical element positioned in the actinide cycle of a cyclic table atomic content of 92 [4]. Radon is one of the elements that contain an atomic number of 86, it has the symbol 222 Rn, and it has a half-life of 3.82 days [5][6][7][8][9][10][11]. One of its most important counterparts is the element (isotope) thoron 220 Rn, which has a half-life of 55.2 sec [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Radon -222 Rn gas is chemically inert and the most important source of lung cancer. Therefore, knowing its concentration and presence in the air is very important [7,11,14]. Radon seeps from the soil into the air, where it decays and produces more radioactive particles.…”

Section: Introductionmentioning

confidence: 99%

Radon and Thoron Concentrations in the Air of Three Schools in East Baghdad

Rejah,

Lazem,

Hameed

et al. 2023

Arab Journal of Nuclear Sciences and Applications

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Radon is continuously emitted from natural elements, especially because of the decomposition of U-238 and Thorium-232. Radon is ordered as a second cause of lung cancer. In this paper, the absorptions of radon and thoron were stately in schools east of Baghdad, namely Abtal Al-Taf, Batalat Karbala, and In Kaldoon Schools. The concentrations of the gases are measured using the SSNTD method (solid-state nuclear track detector method). Radon gas concentrations were different and ranged from 33.8 to 63.7 Bq/m 3 , and a thoron from 48.8 to 127.1 Bq/m 3 , which are within the permissible limits stipulated in the international organization ICRP. The mean annual dose of radon and thoron gases obtained by those in the schools under study was 3.4±0.9 mSv.y -1 and the maximum value of the annual dose was 4.7 mSv.y -1 in the room of the Batalat Karbala school, while the last value was 2.6 mSv.y -1 in the garden of Ibn Kaldoon School.

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Radon decay products equilibrium at different aerosol concentrations

Cited by 10 publications

References 26 publications

Radon and Its Short-Lived Products in Indoor Air: Present Status and Perspectives

Radon and Its Short-Lived Products in Indoor Air: Present Status and Perspectives

Mineral Profiling and Antimicrobial Effects of the West Indian Cherry (Malpighia emarginata DC.) Fruit Extracts Against Selected Pathogenic Bacteria

Radon and Thoron Concentrations in the Air of Three Schools in East Baghdad

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