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The objective of this study is the systematic and individual assessment of the annual effective dose due to inhaled radon for the Seoul Subway Police officers, Korea. The annual average radon concentrations were found to be in the range of 18.9–114 Bq·m−3 in their workplaces. The total annual effective doses which may likely to be received on duty were assessed to be in the range of 0.41–1.64 mSv·y−1. These were well below the recommended action level 10 mSv·y−1 by ICRP. However, the effective doses were higher than subway station staff in Seoul, Korea. [ABSTRACT FROM PUBLISHER]