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... concentrations in water at some residential areas of Ho Chi Minh city The radon concentrations are measured in three types of water: - 14 public drinking water samples from 14 universities in Ho Chi Minh city. .. concentrations in air at some residential areas of Ho Chi Minh city Indoor radon levels have been measured in 50 rooms at several districts in Ho Chi Minh city by using RAD7 The results show that the radon. .. city The radon concentrations are within the range of 0.060.03 to (0.360.06) to Bq.m-3 The mean value is (0.110.01) Bq/m3 - 51 tap water samples collected at 51 houses in Ho Chi Minh city The