The Investigation of Natural Radioactivity in Water Environment in the Lower Reaches of the oft-com:office:smarttags" />DaduRiver, SichuanProvince oft-com:office:office" />
///The investigation of natural radioactivity in water environment in the lower reaches of the Dadu River shows that the radioactive level of groundwater in this region is safe with U of 0.16 μg·L-1~1.74 μg·L-1, low Th and Ra of less than 0.016 Bq·L-1~0.031 Bq·L-1.Water level of groundwater changes with water level of the oft-com:office:smarttags" />DaduRiver.