Distribution of Gamma Radiation Levels in Core Sediment Samples in Gulf of Izmir: Eastern Aegean Sea, Turkey

Authors: D. Kurt, Z. U. Yümün, I. F. Barut, E. Kam

Abstract:

Since the development of the industrial revolution, industrial plants and settlements have spread widely along coastlines. This concentration of development brings environmental pollution to the seas. This study focuses on the Gulf of Izmir, a natural gulf of the Eastern Aegean Sea, located west of Turkey. Investigating marine current sediment is extremely important to detect pollution. This study considered natural radioactivity pollution of the marine environment. Ground drilling cores (the depth of each sediment is different) were taken from four different locations in the Gulf of izmir, Karşıyaka (12.5-13.5 m), Inciralti (6.5-7.5 m), Cesmealti (4.5-5 m) and Bayrakli (10-12 m). These sediment cores were put in preserving bags with weight around 1 kg, and were dried at room temperature to remove moisture. The samples were then sieved into fine powder (100 mesh), and these samples were relocated to 1000 mL polyethylene Marinelli beakers. The prepared sediments were stored for 40 days to reach radioactive equilibrium between uranium and thorium. Gamma spectrometry measurement of each sample was made using an HPGe (High-Purity Germanium) semiconductor detector. In this study, the results display that the average concentrations of the activity values are 8.4 ± 0.23 Bq kg^-1, 19.6 ± 0.51 Bq kg^-1, 8 ± 0.96 Bq kg^-1, 1.93 ± 0.3 Bq kg^-1, and 77.4 ± 0.96 Bq kg^-1, respectively.

Keywords: Gamma, Gulf of Izmir, Eastern Aegean Sea, Turkey, natural radionuclides, pollution.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1127268

References:

[1] Isinkaye M. O., Emelue H. U., “Natural radioactivity measurements and evaluation of radiological hazards in sediment of Oguta Lake, South East Nigeria,” Journal of Radiation Research and Applied Sciences, vol. 8, issue 3, July 2015, pp. 459- 469.
[2] El Samad, O., Baydoun, R., Nsouli, B., & Darwish, T., “Determination of natural and artificial radioactivity in soil at North Lebanon province,” Journal of Environmental Radioactivity, vol. 125, pp. 36- 39, Nov. 2013.
[3] Yii Mei- Wo, Nurrul Assyikeen Md., Jaffary and Zaharudin Ahmad, “Radiation Hazard From Natural Radioactivity in the Sediment of the East Coast Peninsular Malaysia Exclusive,” Economic Zone (EEZ) Vol. 15 No. 2 (2011), pp. 202- 212
[4] Gülşen, F.D., “Historical Trends of Heavy Metals in Sediment From Izmir Bay” (2014), pp. 25
[5] Küçüksezgin, F., Kontas, A., Altay, O., Uluturhan, E., Darılmaz, E., “Assessment of marine pollution in Izmir Bay: nutrient, heavy metal and total hydrocarbon concentrations," Environment International, vol. 32, pp. 41- 51 (2006).
[6] Aközcan S., “Distribution of natural radionuclide concentrations in sediment samples in Didim and Izmir Bay (Aegean Sea-Turkey),” Journal of Environmental Radioactivity, vol. 112, pp. 60- 63, Oct. 2012.
[7] Bozkurt A., Yorulmaz N., Kam E., Karahan G., Osmanlioglu A. E., “Assessment of Environmental Radioactivity for Sanliurfa Region of Southeastern Turkey,” Radiation Measurements Vol 42, Issue 8 (2007), pp. 1387- 1391
[8] UNSCEAR, 2000. Sources and Effects of Ionizing Radiation. United Nations Scientific Committee on the effects of atomic radiation. Report to General Assembly with Scientific Annexes. United Nations, New York.
[9] Abdi, M.R., Kamali, M., Vaezifar, S., “Distribution of radioactive pollution of 238U, 232Th, 40K and 137Cs in northwestern coasts of Persian Gulf, Iran,” Marine Pollution Bulletin, vol. 56, issue 4, April 2008, pp. 751- 757.
[10] M.W. Yii, A. Zaharudin, I. Abdul-Kadir, “Distribution of naturally occurring radionuclides activity concentration in East Malaysian marine sediment,” Applied Radiation and Isotopes, vol. 67, issue 4, April 2009, pp. 630- 635.
[11] El Mamoney, M.H., Khater, A.E.M., “Environmental characterization and radio- ecological impacts of non-nuclear industries on the Red Sea coast,” Journal of Environmental Radioactivity, vol. 73, issue 2, 2004, 151- 168.
[12] Noureddine, A., Benkrid, M., Hammadi, A., Boudjenoun, R., Mnacer, M., Khaber, A. and Kecir, M. S., “Radioactivity Distribution In Surface And Core Sediment Of The Central Part Of The Algerian Coast: An Estimation Of The Recent Sedimentation Rate,” Mediterranean Marine Science, Vol. 4, no. 2, pp. 53- 55 (2003).
[13] Radioactivity in the Marine Environment 2011, Results from the Norwegian Marine Monitoring Programme (RAME), pp. 22
[14] Abdi, M.R., Hassanzadeh, S., Kamali, M., Raji, H.R., “238U, 232Th, 40K and 137Cs activity concentrations along the southern coast of the Caspian Sea, Iran,” Marine Pollution Bulletin, vol. 58, issue 5, May 2009, pp. 658–662.