Abstract
222Rn concentrations were simultaneously measured at a beranda (outdoor) and a room (indoor) of a tall apartment for a week. Average 222Rn concentrations at the outdoor and indoor were 3.25 Bq/m3 and 19.8 Bq/m3, respectively. Correlation analysis showed significant negative relation between outdoor 222Rn concentration and wind velocity as well as wind directions from south and west. There observed a significant positive relation between indoor and outdoor 222Rn concentration as well as a negative relation between indoor 222Rn concentration and wind direction from west.
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