Analysis of the distribution characteristics of 226Ra and 228Ra and their sources in the western part of Qinghai Lake

Autor: Zhanjiang Sha, Jinzhou Du, Weigang Su, Shunli Zhao, Jufang Hu, Chenguang Yu, Fancui Kong, Mei Ye
Rok vydání: 2015
Předmět:
Zdroj: Chinese Journal of Oceanology and Limnology. 33:1402-1412
ISSN: 1993-5005
0254-4059
Popis: The 226Ra and 228Ra activities of Qinghai Lake surface water, groundwater, river water, suspended particles, and bottom sediments were measured in a gamma-ray spectrometer. The sources of 226Ra and 228Ra were discussed according to their distribution characteristics. 226Ra and 228Ra activities (dpm/(100 L)) ranged from 14.13±0.22 to 19.22±0.42 and 17.72±0.66 to 30.96±1.47 in the surface water of the North Bay, respectively, and from 7.88±0.24 to 33.80±0.47 and 15.73±0.74 to 57.31±1.44, respectively, in the South Bay. The surface water near the estuary had a lower salinity and had a higher concentration of radium isotopes than the samples collected further away. The farther offshore the sample, the higher the salinity was, and the lower the radium isotope activity. The distribution of radium activities in the western part of Qinghai Lake is controlled by several factors, including Buha River runoff, desorption from suspended particles derived from the river, groundwater discharge, and a small amount of diffusion from the sediment.
Databáze: OpenAIRE
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