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
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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 χ 2 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.
Keywords210Pb 210Po 210Bi Alpha-particle spectrometry Gamma-ray spectrometry Beta counting
This work was financially supported by Serbian Ministry of education, science and Technological Development (Project number 171018) and through bilateral project between Serbia (Project number 451-03-3095/2014-09/15) and Slovenia (BI-RS/14-15-011).
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