Atmospheric residence times and excess of unsupported 210Po in aerosol samples from the Kuwait bay-northern gulf

Characterization of Airborne Radioactivity in Urban Kuwait: Activity Concentration of Selected Radionuclides

“…210 Pb, 7 Be and 40 K total radioactivity concentrations (particle sizes ranging from 0.41 to 10.2) were similar across the three locations, with geometrical mean values (GM) and geometrical standard deviation (GSD) of all locations being 1.09 (1.5), 7.46 (1.5), and 2.45 (1.4) mBq/m 3 , respectively. However, the concentration of 210 Po was lower in Al-Jahra compared to that of the other two locations [11]- [13] (Table 1). This is likely because Al-Jahra is an open area further away from potential sources of 210 Po, such as oil and petrochemical facilities.…”

“…Figure 5 shows that 40 K and 7 Be activity concentrations significantly contribute to the total radioactivity concentrated on the middle fraction size (0.72 to 2.4 μm), about 50% and 35%, respectively. This indicates that the fine particles onto which 7 Be is attached may accumulate over time, leading to the formation of larger sized particles [13]. This study investigated the activity concentrations of 7 Be, 40 K, 210 Pb, 210 Po, 234 U, and 238 U in three size fractions of airborne aerosols.…”

Effectiveness of airborne radon progeny assessment for atmospheric studies

“…It is worth recalling that in the literature great discrepancies are typically found in residence times calculated using different parent-daughter couples (Anand and Mayya, 2015;Baskaran, 2011;Jia, 2014;Papastefanou, 2009Papastefanou, , 2006Turekian et al, 1977; and therein cited literature). Indeed, 210 Pb/ 214 Bi, 210 Pb/ 214 Pb, and 210 Pb/ 222 Rn couples often provide residence times of the order of few days up to one week (Aba et al, 2020;Ahmed et al, 2004;Bikkina et al, 2015;Gäggeler et al, 1995;Kim et al, 2000;Mohery et al, 2016;Rastogi and Sarin, 2013;Sýkora et al, 2017), couple 210 Po/ 210 Pb provides much longer residence times, of the order of a month and more (Baskaran and Shaw, 2001;Długosz-Lisiecka and Bem, 2012;Jia, 2014;Kim et al, 2000;Marley et al, 2000;McNeary and Baskaran, 2007). Other couples are rarely used in the literature; e.g.…”

A Contributing Factor and Characteristics of High 210Po Activity in Aerosols at Hanoi, Vietnam

“…Among these. it is worth mentioning the use of the 210 Po as a source tracking tool, its use in determining the removal rate, residence time, and exchange of natural aerosols in the troposphere and stratosphere (Aba et al, 2020;Behbehani et al, 2020;Długosz-Lisiecka, 2016;Ouyang et al, 2018;Persson, 2016). The application of the 210 Po in the study of atmospheric processes is yielding positive results and making a great contribution to air quality investigation and monitoring.…”