Investigation of Radioactive Environment in Open Park in a City

Urban parks provide citizens with fitness and leisure space, and their radioactivity affects every surrounding resident. In this paper, seven typical open parks in a city were selected and 350 measuring points were arranged in total, where the field gamma air radiation absorbed dose rate was measured by a portable X-gamma dosimeter. The results show that the surface gamma radiation absorbed dose rate of air ranges from 73.0 nGy/h - 140.0 nGy/h, and the average value ranges from 96.0 nGy/h - 113.0 nGy/h. Meanwhile, the calculated annual effective dose per capita ranges from 0.12 mSv - 0.14 mSv, which is far less than the average level of China (0.54 mSv) and the global average level (0.48 mSv). And the external exposure index due to surface nuclides is less than the limits required by national standards.