Enrichment effect of on Po and Pb.

The mosses have been widely used as bioindicators to investigate pollution and changes of heavy metals in different countries and regions. In this research, the field surveys were carried out for understanding the moss community and enrichment effects of the dominant species of mosses around the uranium mill tailings impoundment in South China, especially for the enriched contentions of Pb and Po in soil and . The results showed that the maximum concentrations of U and Ra in the study sites were 93 mg kg and 1130.8 Bq kg, respectively. The exhalation rate of Rn (), soil U, and Ra contents in SS, SS, and SS were higher than CKS. With the increase of the distance from the central well, the contents of nuclides (U and Ra) in soils and were both decreased. And, the bioconcentration factors of for Pb and Po ranged from 1.05 to 1.49, and 1.25 to 1.40, respectively, indicating an accumulation of Po and Pb from soil by . These results indicated that is hopeful to become an accumulator plant for remediation of radon pollution, and also can be used as a potential indicator plant for radon pollution monitoring.