VERTICAL DISTRIBUTIONS AND GAMMA DOSE RATES OF K-40, Th-232, U-238 AND Cs-137 IN THE SELECTED FOREST SOILS IN IZMIR, TURKEY


KARADENİZ Ö., Yaprak G.

RADIATION PROTECTION DOSIMETRY, vol.131, no.3, pp.346-355, 2008 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 131 Issue: 3
  • Publication Date: 2008
  • Doi Number: 10.1093/rpd/ncn185
  • Journal Name: RADIATION PROTECTION DOSIMETRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.346-355
  • Dokuz Eylül University Affiliated: Yes

Abstract

This paper presents the results obtained from a radioecological study carried out in the selected forest sites of Izmir, Turkey. The levels of gamma-emitting radionuclides, K-40, Th-232, U-238 and Cs-137, in soils were determined using gamma spectroscopy. The activity pro. le for 40K, 232Th and 238U exhibits a uniform distribution with respect to depth. The depth distribution of Cs-137 activity was established by fitting the experimental points to an exponential or a Gaussian function. About 42-97% of the Cs-137 deposition was found in the first 10 cm of soil even after 18 y from Chernobyl accident. The dose-rate and annual-effective dose received from external irradiation were quantified. It is indicated that 137Cs from the fallout plays a less role in external radiation exposures in forest sites of Izmir than in potential exposures from naturally occurring radionuclides accounted for by soil.