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

Uyar E., Yuksel A. O., Guven R., YÜCEL H.

INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH, cilt.32, sa.3, ss.324-330, 2017 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 32 Sayı: 3
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1016/j.ijsrc.2017.05.004
  • Dergi Adı: INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.324-330
  • Anahtar Kelimeler: Correction factor, Self-absorption, Spectral interference, True coincidence summing, Sediment, Gamma-ray spectrometry, SPECTRAL INTERFERENCE CORRECTIONS, RAY SPECTROMETRY, SAMPLES, PB-210
  • Ankara Üniversitesi Adresli: Evet

Özet

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.