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Based on the estimated radon content in underground non-uranium mines in a total of 474 underground non-uranium mines, the average radon concentration in underground non-uranium mines was estimated to be 570 Bq m-3, and the average equilibrium factor between radon and its short-lived progeny was 0. 34. The majority of mines in Canada are open-pit surface mines; only a small percentage of the workforce in non-uranium mines physically work underground, where radon concentration can rise. According to 0. 9 mSv, averaged over the entire mining industry, with occupational exposure to radon in non-uranium mines.
Source link: https://europepmc.org/article/MED/36607249
The thoron measurement sensitivity declines as a negative exponential function with absolute humidity rises, according to the paper's findings, and sensitivity of thoron measurements is much lower than that of radon at the same time, owing to the poor value of thoron measurement sensitivity inside and outside the chamber. As the measurement chamber's air exchange rate increases, the measurement sensitivity of thoron gas first rises quickly and then decreases gradually after hitting its maximum at 0. 24s-1.
Source link: https://europepmc.org/article/MED/36603217
The 1. 6 u00b1 0. 5 to 46. 3 Bq l-1 water sampled varied from 1. 6 1. 1 0. 6 to 46. 3 bq l-1, with an average activity level of 12. 4 u00b1 2. 0 Bq l-1, which was slightly higher than the EPA recommended maximum activity level but below the WHO recommended maximum. The contribution of radon activity in water was determined in relation to total radon activity in air and enclosed space.
Source link: https://europepmc.org/article/MED/36371743
After grouting as a result of an increase in grouting pressure and the water-cement ratio, the radon exhalation rate in porous media gradually increased after the sample's porosity increased after the superfine cement solidification rate rises, according to the W/C = 1. The correlations of coarse, medium, and fine media were 0. 815, 0. 826, and 0. 859, with the radon exhalation rate in porous media with larger pores being relatively high, with a positive correlation between the number of micropores in porous media.
Source link: https://europepmc.org/article/MED/36596422
Local municipalities are concerned that prolonged exposure of indoor radon and its progenies leads to severe health issues for housing occupants, and, consequently, housing improvements in radon-prone areas are of great concern to local municipalities. To successfully implement cost-effective radon mitigation strategies, it must be identified in areas with a high risk of radon exposure, or to avoid the construction of unsafe buildings. The GMDH model was combined with two metaheuristic optimization algorithms to precisely tune the hyper-parameters of GMDH and increase the prediction accuracy of modeling radon distribution, including the bat and cuckoo optimization algorithms. The radon potential map created in this study represents the first stage of identifying areas where large percentages of residential buildings are likely to experience elevated radon levels due to high concentrations of natural radioisotopes in soils and derived soils under building foundations. The generated map helps local authorities plan urban plans more efficiently into areas with lower radon concentrations.
Source link: https://europepmc.org/article/MED/36608375
Residential radon, after smoking, is the second risk factor of lung cancer in the general population and the first in never-smokers. For several countries, radon-attributable lung cancer deaths have been reported. We included original studies with attributable death results relating to radon exposure in our original studies. PRISMA 2020 calibration and PRISMA Extension for Scoping Reviews were followed by PRISMA 2020's PRISMA 2020 system and PRISMA Extension for Scoping Reviews. We found 24 studies describing radon attributable mortality from 14 different nations. Overall, 13 studies used risk models based on cohorts of miners, 8 used risks from residential radon case-control studies, and 3 used both risk model approaches. According to PAF, ranging from 3 to 12% for household risk sources and 7 to 25% for miner risk sources. The risk of lung cancer death in Radon PAF varies widely between studies. The disparity is due in large part to differences in the risk source used and the proposed characterization of radon exposure.
Source link: https://europepmc.org/article/MED/36577801
Also, a hybrid artificial intelligence machine learning framework is suggested for high-throughput screening of metal-organic frameworks as adsorbents for radon separation from indoor air. Two MOF candidates were found with higher APS values in both the radon/N 2 and radon/O 2 systems, as well as those of ZrSQU, the best-performing MOF so far, with R % values above 85 percent. Hence, the current framework has the potential to provide recommendations for the strategic planning of MOFs for radon separation.
Source link: https://europepmc.org/article/MED/36575576
However, the degree to which continuous home radon exposure can raise the risk of health issues earlier in life is uncertain. Herein, we investigated the degree to which chronic home radon exposure in 68 youths aged 6- to 14 years old who live in a region of the United States that is prone to high home radon levels. The results showed specificity in connections between chronic home radon exposure and various inflammatory biomarkers of inflammatory response, highlighting a pathway that could put future mental and physical health problems on the horizon.
Source link: https://europepmc.org/article/MED/36612568
This review and meta-analysis of case-control studies sought to determine the effects of residential radon exposure on human cancers. Patients in Europe and areas with elevated radon levels found that inhaling radon in the indoor environments is closely linked to lung cancer and childhood leukemia in patients living in Europe and areas with elevated radon levels.
Source link: https://europepmc.org/article/MED/36612419
Herein is a quantum chemical analysis of radon and xenon tetroxides. The intermediate species that will develop in their explosive decomposition back to their elemental states was also studied, as well as their energetics. Although T symmetric RnO 4 is a minimum energy system, its typical enthalpy of formation is 88. 6 kJ mol u2212 1 higher than that of XeO 4.
Source link: https://europepmc.org/article/PPR/PPR588291
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