Weekly measurements of 210Pb activity concentration on aerosol particles were performed at ground level in outdoor air in Milan (Italy) during the years 2000-2001. The experimental method was based on the delayed alpha spectrometry of in-grown 210Po activity detected on airborne particles collected on a filter support. On the same filter the 214Pb activity concentration was also measured during the sampling. 210Pb weekly concentration values showed a great variability and the average monthly values exhibited a seasonal pattern characterised by maxima in winter and minima in spring-summer. The same seasonal trend was also observed in 214Pb concentration values. 210Pb average yearly values were 0.70 and 0.82 mBq/m3 in 2000 and 2001, respectively, in good agreement with literature data registered at continental sites of similar latitude and longitude. The activity ratio 210Pb/214Pb was used to evaluate the residence time of fine aerosols in the urban air of Milan, which was 1-2 days.
Seasonal variation of Pb-210 activity concentration in outdoor air of Milan (Italy) / R. VECCHI, G. MARCAZZAN, G. VALLI. - In: JOURNAL OF ENVIRONMENTAL RADIOACTIVITY. - ISSN 0265-931X. - 82:2(2005), pp. 251-266.
|Titolo:||Seasonal variation of Pb-210 activity concentration in outdoor air of Milan (Italy)|
VECCHI, ROBERTA (Primo)
MARCAZZAN, GRAZIA (Secondo)
VALLI, GIANLUIGI (Ultimo)
|Parole Chiave:||210Pb activity concentration; Radioactive aerosols; Residence time of aerosols|
|Settore Scientifico Disciplinare:||Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin)|
|Data di pubblicazione:||2005|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.jenvrad.2004.12.008|
|Appare nelle tipologie:||01 - Articolo su periodico|