Influence of nuclei concentration and humidity upon the attachment rate of atoms in the atmosphere |
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| Affiliation: | 1. School of Mechanical Engineering, Shiraz University, Shiraz, Iran;2. Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY, USA;1. School of Mechanical Engineering, Shiraz University, Shiraz, Iran;2. Department of Otolaryngology Head & Neck Surgery, Shiraz University of Medical Sciences, Shiraz, Iran;3. Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY, USA;1. Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia;2. University of Malaya Research Imaging Centre (UMRIC), Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia;3. Department of Medical Radiation Sciences, Curtin University, Perth 6845, Australia |
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| Abstract: | The attachment rate of atoms and ions to the atmospheric aerosol indoors and outdoors was studied by means of the Tn(220Rn) decay products, which have a diffusion coefficient D = 0.068 cm2s−1 and a sticking probability S = 1. In a nuclei concentration range between 0.6–7 × 104 particles cm−3 the attachment rates were 0.009–0.05 s−1 (relative humidity : 30–50%) corresponding to a half-life of attachment 77 to 14 seconds. The change of the average nuclei size with humidity could be determined by measuring the attachment rate for different water vapour concentrations. By changing the humidity from 20% to about 100%, the average particle size increases up to a factor of 2.1. |
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