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

作　　者：孔凡翠 沙占江 杜金洲 苏维刚 于晨光 赵顺利 胡菊芳 冶梅 

机构地区：[1]Qinghai Institute of Salt Lakes,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences [3]Zoucheng Bureau of Land and Resources [4]Life and Geographical Sciences College and Education Ministry Key Laboratory of Environments and Resources in the Tibetan Plateau,Qinghai Normal University [5]State Key Laboratory of Estuarine and Coastal Research,East China Normal University

出　　处：《Chinese Journal of Oceanology and Limnology》2015年第6期1402-1412,共11页中国海洋湖沼学报（英文版）

基　　金：Supported by the"One Hundred Plan"Project of Chinese Academy of Sciences:Groundwater Discharge and Geochemical Processes of Plateau Inland Lakes(No.Y210101028);the Tracer of Groundwater Discharge by Radioactive Isotope(No.Y360051010)

摘　　要：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 17.724-0.66 to 30.96：kl.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.The 226 Ra and 228 Ra activities of Qinghai Lake surface water,groundwater,river water,suspended particles,and bottom sediments were measured in a gamma-ray spectrometer.The sources of 226 Ra and 228 Ra were discussed according to their distribution characteristics.226 Ra and 228 Ra 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.

关 键 词：^226RA ^228Ra surface water of Qinghai lake groundwater river water Qinghai Lake 

分 类 号：P343.3[天文地球—水文科学]