Methodology for determination of correction factors in direct gamma spectrometric measurement of radionuclides in sediments

In this study, the practical methodologies are described for the determination of the factors for the selfabsorption effect (Fs), spectral interferences (Fcsi), and true coincidence summing effects (Fcoi), which are used in direct gamma-spectrometric measurement of radionuclides such as 210Pb, 238U,...

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Bibliographic Details
Published in:International journal of sediment research 2017-09, Vol.32 (3), p.324-330
Main Authors: Uyar, Esra, Özer Yüksel, Alptuğ, Güven, Rufiyet, Yücel, Haluk
Format: Article
Language:English
Subjects:
coincidence
Correction
Correction factor
factor
Self-absorption
Spectral
Gamma-ray spectrometry
interference
True
Sediment
Self-absorption
Spectral interference
spectrometry
summing
Sediment
Gamma-ray
True coincidence summing
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Summary:In this study, the practical methodologies are described for the determination of the factors for the selfabsorption effect (Fs), spectral interferences (Fcsi), and true coincidence summing effects (Fcoi), which are used in direct gamma-spectrometric measurement of radionuclides such as 210Pb, 238U, 234Th, 226Ra, 214Pb, 228Ac, 208Tl, 214Bi, 137Cs and 40K 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 Fs 1.44-2.10 for 46.5 keV peak (210Pb) and Fs ? 1.25-1.60 for 63.3 keV peak (234Th) lying in the low energy region of the spectrum. The systematic influence was observed for 186.2 keV (226Ra) peak due to spectral interferences with the 235U contribution. For this peak, Fcsi is changed from 0.921 to 0.955. Additionally, the present study suggests that true coincidence summing (TCS) effects are not dominant, except for 208Tl and 214Bi for which Fcoi ranged from 1.179 to 1.192 an ranged from 1.140 to 1.151, respectively.
ISSN:1001-6279
DOI:10.1016/j.ijsrc.2017.05.004