Akademik Veri Yönetim Sistemi
INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH, cilt.32, sa.3, ss.324-330, 2017 (SCI-Expanded)
In this study, the practical methodologies are described for the determination of the factors for the self-absorption 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 Pb-210, U-238, Th-234, Ra-226, Pb-214, Ac-228, Tl-208, Bi-214, Cs-137 and K-40 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 (Pb-210) and F-s = 1.25-1.60 for 63.3 keV peak Th-(234) lying in the low energy region of the spectrum. The systematic influence was observed for 186.2 keV (Ra-226) peak due to spectral interferences with the U-235 contribution. For this peak, F-csi is changed from 0.921 to 0.955. Additionally, the present study suggests that true coincidence summing (TCS) effects are not dominant, except for Tl-208 and Bi-214 for which F-coi ranged from 1.179 to 1.192 an ranged from 1.140 to 1.151, respectively. (C) 2017 International Research and Training Centre on Erosion and Sedimentation/the World Association for Sedimentation and Erosion Research. Published by Elsevier B.V. All rights reserved.