Activity size distribution and residence time of 7Be aerosols in the Arctic atmosphere

Estimation of Inhaled Effective Doses of Uranium and Thorium for Workers in Bayan Obo Ore and the Surrounding Public, Inner Mongolia, China

“…PM that enters the bronchioles of the lungs is the main hazard to the human body. The AMAD of natural radionuclides ( 40 K, 210 Pb, and 7 Be) have been reported in the literature [15,[20][21][22]33], but the AMAD of natural uranium and thorium is rarely investigated. The average AMAD values of natural uranium and thorium in the living area were estimated to be 3.36 and 3.64 µm, respectively.…”

“…The results obtained by using our procedure were all compared with the concentrations of known reference standard materials. Researchers generally believe that the particle size distribution of radionuclide in the atmosphere has a log-normal distribution [20][21][22]. The particle size distributions of uranium and thorium are also assumed to have a log-normal distribution.…”

Long-term variations of radionuclides in the Bratislava air

“…Winkler et al, 1998;Papastefanou, 2006;Ioannidou and Paatero, 2014) used a different method for calculation of the residence time of aerosols in the atmosphere. They calculated the residence time by dividing the difference between the measured activity median diameter (AMD) and the diameter of Aitken nuclei (AND) by the mean growth rate of aerosol particles (MGR).…”

Production of cosmogenic isotopes 7Be, 10Be, 14C, 22Na, and 36Cl in the atmosphere: Altitudinal profiles of yield functions

“…For many tasks it is important to know detailed altitude profiles of the isotope production: studies of solar energetic particle events in the past [e.g., Usoskin et al, 2006;Webber et al, 2007;Miyake et al, 2012;Usoskin et al, 2013]; detailed reconstructions of long-term solar activity using isotopes of 10 Be and 36 Cl including realistic atmospheric transport [e.g., McCracken, 2004;Field et al, 2006;Pedro et al, 2006;Heikkilä et al, 2009;Delaygue et al, 2015]; in situ atmospheric measurements of 14 C [Jöckel et al, 1999[Jöckel et al, , 2003Kanu et al, 2016]; and tracing of air mass dynamics and water flows using cosmogenic radioisotopes [e.g., Jordan et al, 2003;Sakaguchi et al, 2005;Leppänen et al, 2012;Ioannidou and Paatero, 2014;Pacini et al, 2015]. However, the previously published yield functions were presented either without altitudinal resolution, giving only atmospheric columnar or global production of isotopes, or with very rough altitudinal resolution, insufficient for detailed computations.…”