Radioactivity concentrations of natural radionuclides in fine dust of Jeju, Korea
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Radioactivity concentrations for natural radionuclides were determined from fine dust samples collected in Jeju, Korea according to atmospheric events (Asian dust, haze, fog-mist, and non-event), and radium equivalent activity was calculated. The mean atmospheric radioactivity concentrations for 238U, 232Th, and 40K in 127 fine dust samples were 0.49, 0.24, and 7.23 μBq m−3, respectively, and the radium equivalent activity was 33.25 Bq kg−1. The mean concentrations of 238U and 232Th in the fine dust during the Asian dust period were 1.31 and 1.60 μBq m−3, respectively, above the global average, while the values for the other three atmospheric events were lower. The ratio of 232Th/238U radioactivity during the Asian dust period was 1.22, higher than the ratio for the other three atmospheric events.
Abstract
Radioactivity concentrations for natural radionuclides were determined from fine dust samples collected in Jeju, Korea according to atmospheric events (Asian dust, haze, fog-mist, and non-event), and radium equivalent activity was calculated. The mean atmospheric radioactivity concentrations for 238U, 232Th, and 40K in 127 fine dust samples were 0.49, 0.24, and 7.23 μBq m−3, respectively, and the radium equivalent activity was 33.25 Bq kg−1. The mean concentrations of 238U and 232Th in the fine dust during the Asian dust period were 1.31 and 1.60 μBq m−3, respectively, above the global average, while the values for the other three atmospheric events were lower. The ratio of 232Th/238U radioactivity during the Asian dust period was 1.22, higher than the ratio for the other three atmospheric events.
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