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This study monitored the activity concentrations of radionuclides in seepage water from a decommissioned uranium tailings pond，analyzed the temporal trends of radionuclide concentrations in seepage water from 2020 to 2024，and investigated the correlations between radionuclides in seepage water and monitoring well water to evaluate the radiological impact of seepage on surrounding groundwater. The results showed that the seepage water contained uranium at concentrations ranging from 15.1 to 397 μg·L-1，226Ra from 0.008 to 0.176 Bq·L-1，210Pb from 0.007 to 0.172 Bq·L-1，and 210Po from 0.004 to 0.021 Bq·L-1，levels of 226Ra，210Pb，and 210Po are all below regulatory limits. In monitoring well water，uranium concentrations ranged from 0.21 to 2.98 μg·L-1，226Ra from 0.006 to 0.023 Bq·L-1，210Pb from 0.004 to 0.131 Bq·L-1，and 210Po from 0.002 to 0.011 Bq·L-1，all consistent with local background levels. Analysis using the Mann-Kendall test revealed no significant temporal trends for uranium and 226Ra in seepage water，while 210Pb and 210Po concentrations exhibited declining trends and become stable. According to the evaluation results of Spearman correlation coefficient, the Spearman correlation coefficient ρs for uranium，226Ra，210Pb，and 210Po in the seepage water and monitoring well water were 0.314 3，0.074 4，0.939 5，and 0.460 5，respectively. Significant positive correlations were observed between 210Pb and 210Po in monitoring well water and their counterparts in seepage water. These findings provided critical data and regulatory guidance for authorities and enterprises to strengthen radiation environmental monitoring and implement targeted management strategies, thereby mitigating potential risks to groundwater safety around uranium tailings facilities.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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