Abstract: The measurement results of surface gamma radiation dose rate, atmospheric radonconcentration, and natural radionuclide contents in soils/rocks and water in Liyang City, Jiangsu Province, are presented. It indicates that the surface gamma radiation dose rate averages 78 nGy/h, and is above normal in Liyang volcanic basin periphery and the outer reaches of Miaoxi granite contact zone, with a maximum of 800 nGy/h. The mean concentration of atmospheric radon is 14.5 Bq/m³. Theaverage content of natural radionuclide contents in soils/rocks is ⁴⁰K＞²²⁶Ra＞²³⁸U＞²³²Th, and 6, 0.085, 17.1 and 212mBq/L in water, respectively. The total α, total β level in water is 0.028 and0.146 Bq/L. The public dose arising from natural background is 1.175 mSv/aper capita in the region.

Key words: Liyang city, Natural radioactivity, Radiation dose rate, Radionuclide