Behavior analysis of the aerosol using the radioactive nuclides

Natural Radionuclides, 7Be (half-life 53.29 d) and 210Pb (half-life 22.3 y) in total deposition and aerosol samples were measured. These two radionuclides with their different sources are therefore useful to understand the mechanisms of aerosol behavior. All monthly depositions were collected in Kyushu University (Fukuoka City), University Forest (Sasaguri) and Mt. Sefuri by the tray. The aerosol in the atmosphere was collected by HV air sampler. The rain sample was divided one time of rain into arbitrary terms. All samples were measured with the gamma-ray spectrometry using Ge semiconductor detector. The seasonal change of 7Be and 210Pb depositions in all deposition samples was observed showing a spring peak in 7Be depositional pattern. On the other hand, the difference in seasonal change was seen. When the process of deposition was divided into Rainout, Washout and Dry deposition, the total deposition of 7Be became 71%, 24% and 5%, respectively. (author)