Deposition of radon progeny on indoor surfaces

Surface deposition is one of the main removal mechanisms of airborne aerosol particles. Yet, understanding of this process is still not adequate. This is likely to be due to deficiencies in the understanding of aerosol interaction processes including deposition and difficulties in comparing different sets of experimental data. The aim of this work was to determine deposition velocity for a spectrum of 222Rn progeny particle sizes for well defined experimental conditions and to interpret the results in a broad perspective of available literature data. Deposition velocities determined here are in the range from 2 to 3.5 m h−1 for attached fraction in the size range from 120 to 470 nm activity median diameter (AMD), in the range from 5.5 to 9.3 m h−1 for size range from 6 to 35 nm and 32.7 m h−1 for particles of size 1.3 nm. The results are discussed and compared with literature data.