Estimation of dry déposition velocity of fine aérosols in urban area: use of fluorescein and Be as déposition tracer
Congress title :CFA 2006 - 22ème Congrès Français sur les Aérosols
Congress town :Paris
Congress date :29/11/2006
In the frame of its researches, IRSN studies the aérosols dry déposition in both rural and urban environments. In case of accidental release of radionuclides in the atmosphère, IRSN must be able to calculate the impact on the population in urban zone. For it, IRSN takes part in the PRIMEQUAL project called SaliFa. The objective of this project is to quantify the soiling of building façades. It was performed in collaboration with « Centre Scientifique et Technique du Bâtiment » (CSTB), « Complexe de Recherche Interprofessionnel en Aérothermochimie » (CORIA, Rouen) and « Ecole Centrale de Nantes » (ECN). During this study, dry déposition velocities of aérosols hâve been measured on glass and mineral coating spécimens. Two types of experiments were conducted. one "short-term" campaign using fluorescein as tracer and one "long-term" using 7Be radionuclide as tracer for access to dry déposition velocity. Results obtained by both expérimental approaches, fluorescein on one hand and natural radioactivity (7Be) on the other hand are in good agreement.