In Tianjin city to choose a suitable location field measurements, from at present only more than 30 points measured data statistics, Tianjin city soil radon concentration was on average 8 572 Bq/ms. According to radon and its short-lived progeny formation, decay, migration, enrichment regularity and the measured results in our hospital, Tianjin city area of fracture through the zone and recessed regions, such as Jix- ian, Ninghe, Baodi, Wuqing, Hangu and Tanggu areas along the Hai River, higher radon concentrations.%在天津市域内选择适宜地点实地测量，从目前仅有的30余点实测资料统计，天津市土壤氡的平均浓度为8572Bq／m’。根据氧及其短寿命子体的形成、衰变、运移、富集规律以及实测结果得出，天津市域内的断裂经过地带以及凹陷地区，如蓟县、宁河、宝坻、武清、汉洁、市区及塘沽的海河沿线地区，氡浓度较高。
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