某铀矿区周边土壤<sup>238</sup>U和<sup>226</sup>Ra分布特征及污染评价

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Abstract To determine the pollution intensity and range of the soil pollution source surrounding a uranium mining area, and quantify the pollution sources that need to be treated, we carried out a field investigation and statistical analysis of ²³⁸U and ²²⁶Ra activities in the soil layers of 0.0~0.2,0.2~0.4,0.4~0.6,0.6~0.8,0.8~1.0m around the uranium mine, and thereby determined the spatial distribution of radionuclide contamination and its effectiveness, as well as using ²²⁶Ra/²³⁸U to reflect weathering degree. The results demonstrated that the highest concentrations of ²³⁸U and ²²⁶Ra were 813.44~5059.20 and 737~4536Bq/kg respectively at 0.0~0.2m soil depth. The concentrations of ²²⁶Ra and ²³⁸U decreased with the increase of depth, and the concentrations of ²³⁸U and ²²⁶Ra at the depth of 0.6~1.0m were still higher than the soil decontamination standard concentration (370Bq/kg) regulated by the United States Nuclear Regulatory Commission (NRC) on the residual radionuclides in the decommissioning of uranium mines and Hydrometallurgical facilities. Therefore, for the soil treatment in the study area, the needed treatment soil depth should not be less than 1m. The results of pollution assessment showed that in the study area, the soil area with severe to extremely severe pollution and strong ecological risk hazards accounted for the highest proportion; with the increase of the distance from uranium mining area, the pollution degree of ²²⁶Ra and ²³⁸U decreased, and the potential ecological risk decreased as well.

Key words： uranium tailings ²³⁸U ²²⁶Ra distribution characteristics pollution evaluation soil

Received: 07 September 2020

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X825

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	Articles by authors
	JIANG Wen-bo
	GAO Bai
	ZHANG Hai-yang
	LIN Cong-ye
	WANG Juan
	Yi Ling

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JIANG Wen-bo,GAO Bai,ZHANG Hai-yang等. Distribution characteristics and pollution assessment of ²³⁸U and ²²⁶Ra in soils surrounding a uranium mining area[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(4): 1799-1805.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I4/1799

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