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| Distribution and environmental significances of radionuclides in sediments of Dalian coastal area |
| DU Jin-qiu1,2, GUAN Dao-ming1,2, YAO Zi-wei2, GAO Hui2, WANG Zhen2, MENG Shu-feng2,3 |
1. Department of Marine Chemistry, Ocean University of China, Qingdao 266100, China;
2. National Marine Environmental Monitoring Center, Dalian 116023, China;
3. School of Marine Technology and Environment, Dalian Ocean University, Dalian 116023, China |
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Abstract Levels and distribution of 238U, 226Ra, 210Pb, 40K and 137Cs in surface sediment and sediment core samples collected from Dalian coastal area were analyzed, the influencing factors and sedimentation rates were discussed. The results showed that the horizontal level of individual radionuclide was similar. Characteristic of terrestrial input was obvious. On the vertical level, the content of 40K displayed no apparent change with depth, while the levels of other radionuclides fluctuated with depth increase, there was no significant change in the material input. A deficit in 226Ra was recorded in comparison with matrix 238U, excessive of 210Pb was recorded in comparison with matrix 226Ra, and a positive correlation between 137Cs and 40K existed .The sedimentation rate in Dalian coastal area was 0.49 and 0.43cm/a based on the methods of 210Pbex and 137Cs, respectively.
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Received: 27 September 2016
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