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Internal radiation exposure is impossible to quantify directly, and therefore different lung models were created. A modified breathing rate is instead used on the ICRP66 model's assumptions to analyze the regional deposition of radioactive aerosols, and a comparison has been made using the results of the ICRP66 model deposition results. According to the study, the percentage deposition fraction in extrathoracic regions in the ET1 zone rises from 6. 5 percent to 50. 3 percent, and in the ET2 zone, the percentage rise from 1 to 10 bcm increases from 6. 6 percent to 50. 3 percent. The deposition of large size aerosols in this region is at its highest rate in the alveolar region as compared to other areas of the respiratory tract, and small size aerosols are also found to be virtually negligible in this region.
Source link: https://doi.org/10.1177/11786302221149401
A report on radon-222 in the water bodies of Durgapur [non-geothermal area] and nearby Bakreswar hot spring [geothermal province], India. For the first time, age-dependent potential health risk assessments of the residents in Durgapur and Bakreswar as a result of radon exposure were done. Due to radon exposure at Durgapur and Bakreswar, the present study is the first attempt to determine the mean ingestion /and inhalation dose per annum, total effective dose [TED] per annum, and the health risk assessment for cancer in adults, children, and infants. For the first time, the radiation profile maps relating to radon concentration and related contour maps of health risk factors [HRF] for adults, children, and infants were also prepared. To shield individuals from radon exposure, the researchers also suggested banning certain water sources to shield people from radon risk.
Source link: https://doi.org/10.1007/s10653-023-01478-y
However, the degree to which chronic home radon exposure could increase the risk of health issues earlier in life is unclear. Herein, we investigated the extent to which chronic home radon exposure in 68 youths aged 6- to 14 years old, who live in a region of the United States with elevated home radon levels. The results showed specificity in relationships between chronic home radon exposure and various biological markers of inflammation activity, highlighting a pathway that may place risk of future mental and physical health disorders.
Source link: https://doi.org/10.3390/ijerph20010246
This report looked at the effects of residential radon exposure on human cancers by a systematic review and meta-analysis of case-control studies. Inhaling radon in the indoor environments is closely related to lung cancer and childhood leukemia in patients living in Europe and areas with elevated radon levels.
Source link: https://doi.org/10.3390/ijerph20010097
Local authorities are concerned over continuing radon and its progenies' chronic health conditions for housing occupants; consequently, building developments in radon-prone areas are of major concern to local municipalities. To implement cost-effective radon mitigation strategies successfully or to prevent the construction of unsafe buildings, areas with high risk of radon exposure must be identified. The GMDH model was integrated with two metaheuristic optimization algorithms, specifically the bat and cuckoo optimization algorithms, to optimally tune the hyper-parameters of GMDH and improve the prediction accuracy of modeling radon distribution. The radon potential map developed in this study represents the first stage of determining areas in which large portions of residential buildings are likely to experience significant radon levels due to elevated levels of natural radioisotopes in rocks and derived soils under building foundations, as shown by the radon potential map. The generated map guides local authorities to plan urban plans more effectively against areas with lower radon concentrations.
Source link: https://doi.org/10.1016/j.envint.2022.107724
Based on the reported radon concentration 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, with the average equilibrium factor between radon and its short-lived progeny being 0. 34. The majority of mines in Canada are open-pit surface mines; only a small minority of the workforce in non-uranium mines physically work underground, where radon concentrations can rise. 0. 8 mSv is the averaged across the entire mining industry, with occupational exposure to radon in non-uranium mines estimated to be 0. 9 mSv.
Source link: https://doi.org/10.1097/HP.0000000000001661
Both thoron exposure assessment and minimizing the impact on radon measurement are both important issues for both thoron exposure measurement and reducing the influence on radon measurement. When the measurement chamber's air exchange rate rises, the measurement sensitivity of thoron gas first rises rapidly and then decreases gradually after reaching its maximum at 0. 24s-1. In practice, increasing the sampling flowrate could raise the sensitivity of thoron measurement under the monitor's current state.
Source link: https://doi.org/10.1088/1361-6498/acb067
This paper was mainly based on experiments to determine the relationship between the radon exhalation rate of the porous medium after grouting and the sand grain diameter, grouting pressure, and slurry water-cement ratio. The correlations of coarse, medium, and fine media were 0. 815, 0. 826, and 0. 859, with a positive correlation between the radon exhalation rate of porous media with large pores being relatively higher and demonstrating a positive correlation with the number of micro pores in porous media.
Source link: https://doi.org/10.1016/j.scitotenv.2022.161352
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 analyzed. We selected 24 studies that reviewed 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. Radon geometric mean concentration ranged from 11 to 83 Becquerels per cubic meter, with population attributable fractions ranging from 0. 2 to 26%. PAF ranged from 3 to 12% for household risk sources and from 7 to 25 percent for miner risk sources, according to the following quality studies. The PAF for lung cancer risk varies widely among studies. The main reason of the disparities is due to differences in the risk source used and the theoretical description of radon exposure assumed.
Source link: https://doi.org/10.1038/s41370-022-00506-w
MOFs with a high adsorbent performance score and high regenerability were identified by random forest classification and grand canonical Monte Carlo simulations. Both the radon/N2 and radon/O2 methods were found with higher APS values in both the radon/N2 and radon/O2 devices, relative to ZrSQU, the best-performing MOF so far, with R % values exceeding 85 percent. Consequently, the current framework has the ability to provide recommendations for the strategic planning of MOFs for radon separation.
Source link: https://doi.org/10.1021/acsami.2c19207
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