Resuspension factors of 137Cs in Hannover after the Chernobyl accident

Shortly after the Chernobyl accident, resuspension factors for 137Cs were determined in Hannover, Germany. In the first few weeks after deposition a clear dependence of airborne 137Cs concentration, which ranged between 0.5 and 10 m BQ m-3, on wind speed was observed. Best fit to the data was obtained for a power exponent close to unity. After a few months, even during strong wind periods with appreciable dust resuspension, radioactivity concentrations were below the detection limit.