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In the study the activities of polonium  210 Po and uranium  234 U,  238 U in plants, collected near phosphogypsum waste heap in Wiślinka (northern Poland), were determined by using the alpha spectrometry. The obtained results revealed that the concentrations of  210 Po,  234 U, and  238 U in the analyzed plants were differentiated. In the analyzed flora organisms the highest amounts of polonium and uranium were found in ruderal plant samples as well as willow samples ( Salix viminalis ) from protection zone of phosphogypsum waste heap. The concentrations of  210 Po,  234 U and  238 U in the analyzed plants were higher in roots than in green parts of plants. The higher concentrations of  210 Po and  238 U radionuclides were estimated for hydrophyte (common sedge  Carex nigra  Reichard), the favourite habitat of which is particularly wet meadow and for plants co llected in the vicinity of phosphogypsum waste heap. The major source of polonium and uranium in analyzed plants is root system. The values of  234 U/  238 U activity ratio in all analyzed plants are closed to one, what indicated that source of uranium in analyzed plants is phoosphogypsum. The highest uranium and polonium concentrations were characterized for plants, which are covered with tomentose.

Bioaccumulation of polonium ( 210 Po) and uranium ( 234 U, 238 U) in plants around phosphogypsum waste heap in Wiślinka (northern Poland)