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Report No.

Study of wet scavenging of atmospheric aerosols using $$^{222}$$Rn decay products in rainwater

Takeyasu, Masanori 

The concentrations and the concentration ratios of individual short-lived $$^{222}$$Rn decay products ($$^{214}$$Pb and $$^{214}$$Bi) in rainwater were measured, and a scavenging model was designed for explaining the measurement results. The measurement was done at Kumatori-cho in Osaka, Japan by $$gamma$$-ray spectrometry using a low-background Ge detector. The dependence of the time variations of the concentrations and their ratios on rainfall rate was investigated. It was observed that the concentrations were negatively correlated with the rainfall rate in some rainfall events, and that there was no clear correlation in other rainfall events. The concentration ratios showed a weak negative correlation with the rainfall rate for most of the observed rainfall events.



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