Determination of ²¹⁰Pb by direct gamma-ray spectrometry, beta counting via ²¹⁰Bi and alpha-particle spectrometry via ²¹⁰Po in coal, slag and ash samples from thermal power plant

In order to compare three different techniques and estimate radiological impact, activity concentration of ²¹⁰Pb in coal, slag and ash samples from thermal power plant 'Nikola Tesla', Serbia, were measured, and results are presented in this study. Determination of ²¹⁰Pb was carried out in three ways: using HPGe gamma spectrometer and via in-growth of ²¹⁰Po and ²¹⁰Bi by alpha-particle spectrometry and proportional counting, respectively. The results obtained for three different techniques were compared. Statistical analysis and comparison of methods were carried out by combination of Z score and χ² statistical tests. Tests results, as well as values of measured activities concentrations obtained by alpha and gamma spectrometry, showed that gamma spectrometry is a valid alternative to time-consuming alpha spectrometry for low level activity measurements of ²¹⁰Pb. This remark is also valid even for gamma spectrometers with poor efficiency in low energy region. (author)