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Radiation Protection Dosimetry Advance Access originally published online on July 1, 2008
Radiation Protection Dosimetry 2008 131(3):346-355; doi:10.1093/rpd/ncn185
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Vertical distributions and gamma dose rates of 40K, 232Th, 238U and 137Cs in the selected forest soils in Izmir, Turkey

Özlem Karadeniz1,* and Günseli Yaprak2

1 Department of Physics, Faculty of Arts and Science, Dokuz Eylül University, 35160 Tinaztepe, Izmir, Turkey
2 Institute of Nuclear Sciences, Ege University, 35100 Bornova, Izmir, Turkey

* Corresponding author: ozlem.karadeniz{at}deu.edu.tr

Received April 11, 2008, amended May 31, 2008, accepted June 10, 2008

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, 40K, 232Th, 238U and 137Cs, in soils were determined using gamma spectroscopy. The activity profile for 40K, 232Th and 238U exhibits a uniform distribution with respect to depth. The depth distribution of 137Cs activity was established by fitting the experimental points to an exponential or a Gaussian function. About 42–97% of the 137Cs 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.


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