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On the source of radioisotope Cs-137 in the surface sediments of Lake Qinghai



On the source of radioisotope Cs-137 in the surface sediments of Lake Qinghai



Hupo Kexue 19(5): 516-521



The Cs-137 dating technique has been applied widely in Lake Qinghai, one of the highlighted areas of environniental studies in China. The investigated vertical profiles indicate the Cs-137 content in the upmost surface sediment ( the upper 1 em layer of the surface) is about 60 Bq/kg (2/3 of the peak value), which is much higher than the Supposed content caused by Cs-137 from atmosphere in recent years. In order to investigate the source of Cs-137 i- otope and understand the process of the sediments forming, this paper focused on comparative studies of Cs-137 inventorv both in background samples and in the sediments of Lake Qinghai. Comparative studies of Cs-137 content in sediments on the surface and in sediments at the confluenee of contributing streams of Lake Qinghai were also carried out. The results indicate that atmosphere precipitation during the nuclear explosion is the major source of Cs-137 in the sediments of Lake Qinghai, causing 4/5 content of the total Cs-137 in the sediments of Lake Qinghai, with just 1/5 content from Source of dust sands and contributing streams indirectly. Cs-137 in the upmost sediments mainly comes from bottom sediments. In such case, when the sediment core was used to study the environment of the Lake Qinghai, precautions should be taken when seeking for high resolution.

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Accession: 021491073

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