| 12 | Methodology for determination of correction factors in direct gamma spectrometric measurement of radionuclides in sediments显示文摘In this study, the practical methodologies are described for the determination of the factors for the selfabsorption effect(F_s), spectral interferences(F_(csi)), and true coincidence summing effects(F_(coi)), which are used in direct gamma-spectrometric measurement of radionuclides such as ^(210)Pb, ^(238)U, ^(234)Th, ^(226)Ra,^(214)Pb, ^(228)Ac,^(208)Tl, ^(214)Bi,^(137)Cs and ^(40)K in samples. To validate the applied methods, certified reference materials(CRMs) of lake and stream sediments were measured with an n-type Germanium(Ge)detector-calibrated using a multinuclide reference source. The highest self-absorption correction factors ranged from F_s = 1.44-2.10 for 46.5 keV peak(210 Pb) and F_s = 1.25-1.60 for 63.3 keV peak(^(234)Th) lying in the low energy region of the spectrum. The systematic influence was observed for 186.2 keV(226 Ra)peak due to spectral interferences with the 235 U contribution. For this peak, F_(csi) is changed from 0.921 to0.955. Additionally, the present study suggests that true coincidence summing(TCS) effects are not dominant, except for 208 T1 and 214 Bi for which F_(coi) ranged from 1.179 to 1.192 an ranged from 1.140 to1.151, respectively. | Esra Uyar Alptug Ozer Yüksel Rufiyet Güven Haluk Yücel | 2017 | International Journal of Sediment Research2017，32，3： | 0 |
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