Abstract: Polonium-210, an important natural radionuclide, attracts extensive attention of environmental monitors due to its widely presence in the biosphere and extreme toxicity. In order to determine the uncertainty of polonium-210 analysis in aerosol, the evaluation process of uncertainty was introduced, and the contribution of each component to uncertainty wasdiscussed. The results show that the uncertainty is mainly from the sampling volume of aerosol samples, the preparation and transfer of tracer solution, the measurement by α counting and other aspects.

Key words: Polonium-210, Uncertainty, Aerosol samples, Aalpha spectrum analysis