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(7)Be, (210)Pb and (40)K depositions over 11 years in Málaga.
Journal of Environmental Radioactivity 2017 November
The monthly bulk depositional fluxes of three natural radionuclides ((7)Be, (210)Pb and (40)K) were measured at a Mediterranean coastal station (Málaga) over an 11-year period from 2005 to 2015. The mean annual depositional fluxes of (7)Be, (210)Pb and (40)K were 1215, 144 and 67 Bq m(-2) year(-1) respectively, showing a clear seasonal trend with minimum values recorded during summer and maximum values in winter. The rainfall regime with dry summers allows estimating the dry deposition. Assuming constant dry deposition through each year, (7)Be, (210)Pb and (40)K would account for 12.5, 26.5 and 33% of the bulk fallout respectively which indicates that deposition for (210)Pb and (40)K are significantly higher than (7)Be. The precipitation-normalized enrichment factor alpha used to explain seasonal variations in the depositional fluxes of radionuclides with respect the rainfall, indicates higher depositional fluxes during spring and summer than expected from the amount of rainfall. Despite their different origin, (210)Pb and (7)Be monthly depositional fluxes have strong correlation. The atmospheric deposition fluxes of (7)Be, (210)Pb and (40)K were controlled mainly by the amount of rainfall (r = 0.89, 0.91 and 0.66 respectively). Moreover, principal component analysis was applied to the datasets and deposition of radionuclides and rainfall in the same component highlighting the importance of the washout mechanism. The mean depositional velocity of aerosols evaluated using (7)Be and (210)Pb are similar and are compared to other published values.
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