The resultsof 222Rn and 226Ra activity measurements in drinkable water supplies of the ThuDuc region
in Ho Chi Minh City,Vietnam,are presented in this paper.Themeasurementswereperformedusinga
RAD 7radondetectormanufacturedbyDurridgeCompany,Inc.Meanconcentrationsof 222Rn and 226Ra
werefoundtobe0.1170.01Bql1 and 0.1170.02 Bql1 in 14drinkingwatersamples.Theyare
0.1270.01Bql1 and 0.1070.02 Bql1 in 15tapwatersamples,respectively