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Outline
In order to grasp the radioactive level and its changing trend around the ionic rare earth ore separation enterprise, and evaluate the potential impact of smelting separation process on the surrounding environment, this study takes a typical rare earth separation enterprise in Guangxi as an example. From 2017 to 2024, a systematic tracking and monitoring was carried out for 8 consecutive years, and the spatial and temporal distribution data of the radiation environment were obtained, and the dynamic characteristics and changing trends of the radiation environment around the enterprise were grasped. The maximum gamma dose rate around the enterprise is 104 nGy/h, and the maximum radon concentration is 69.0 Bq/m3. The specific activities of 238U, 232Th, 226Ra, and 40K in solid-state environmental samples are 36.8-88.9, 28.9-180, 27.7-107 Bq/kg, and 452-479 Bq/kg, respectively. The specific activities of 238U, 232Th, 226Ra, and 40K in gaseous environmental samples are <29.8, <6.95-27.6, <6.28-27.6, and <19.3-33.5 Bq/kg, respectively. The mass concentrations of uranium and thorium in liquid environmental samples are 0.057-3.7 and 0.019-0.948 μg/L, respectively. The activity concentrations of 226Ra, total alpha, and total beta are 2.01-21.9 mBq/L, 0.017-0.123 Bq/L, and 0.027-0.099 mBq/L, respectively. The total amount of U and Th in the liquid effluent sample is 0.241-168 μg/L, and the activity concentrations of 226Ra, 210Po, and 210Pb are 16.2-1 870, 1.35-89.1, 2.56-96.8 mBq/L. According to the analysis of monitoring results, from 2017 to 2024, the gamma radiation dose rate and radon concentration level in the surrounding environment of the ion type rare earth separation enterprise, as well as the radioactive indicators of surface water, groundwater, aerosols, soil, and sediment, basically meet the standard requirements. The overall radiation environment around the enterprise is stable, and the obvious fluctuations in some indicators are closely related to the adjustment of sewage treatment processes. The results provide a reliable reference for the radiation environment management of associated radioactive mining enterprises.
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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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