Ardahan ilinin (Türkiye) toprak örneklerinde ortalama etkin dozun değerlendirilmesi için doğal radyoaktivite analizi

Bu çalışmada Ardahan ili yüzey topraklarında doğal radyonüklidlerin dağılımı belirlenmiştir. Ardahan ili ve çevre ilçelerinden toplanan 35 adet toprak örneğinin 238U, 232Th, 40K ve 137Cs aktivite konsantrasyonları, NaI(Tl) gama spektrometresi ile ölçülmüştür. Toprak numunelerindeki 238U, 232Th ve 40K doğal radyonüklitlerinin ortalama aktiviteleri sırasıyla, 29.9±6.2, 36.7±6.8 ve 435.1±23.9 Bq kg-1 olarak tespit edildi. Fisyon ürünü 137Cs için, numunelerin ortalama aktivitesi 15.5±0.8 Bq kg-1 olarak belirlenmiştir. 35 adet toprak numunesinde radyonüklidlerin varlığına bağlı olarak ortalama açık hava gama doz oranı (karasal ve kozmik) ve havadaki ortalama yıllık etkili doz oranı sırasıyla, 56.3±8.7 nGyh-1 ve 69.0±6.7 μSv y -1 olarak bulunmuştur. Bu araştırma, rakım ile doğal radyonüklidler arasında net bir korelasyon olduğunu gösterdi. Ardahan şehir merkezi ve ilçeleri için elde edilen sonuçlar, grafiksel olarak sunulmuş ve Türkiye ortalamaları ve dünya ortalamaları ile karşılaştırılmıştır.

Natural radioactivity analysis in soil samples of Ardahan province, Turkey for the assessment of the average effective dose

In this study, the distribution of natural radionuclides in surface soils in Ardahan province has beendetermined. The activity concentrations of 238U, 232Th, 40K and 137Cs in 35 soil samples collected from theArdahan city and its surrounded districts were measured through NaI (Tl) gamma spectrometry. Theaverage activities of the samples were determined to be 29.9±6.2, 36.7±6.8 and 435.1±23.9 Bq kg-1 for thenatural radionuclides 238U, 232Th and 40K, respectively. For the fission product 137Cs, the average activityof the samples was assigned to be 15.5±0.8 Bq kg-1. The average outdoor gamma dose rate (terrestrial andcosmic) and also the average annual effective dose rate in air due to the presence of radionuclides in 35 soilsamples were obtained as 56.3±8.7 nGy h-1 and 69.0±6.7 µSv y-1, respectively. This research showed a clearcorrelation between the altitude and the natural radionuclides. The results obtained for Ardahan citycentrum and its districts were presented graphically and compared with the world average values and thoseof Turkey.

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Anagnostakis M. J; E.P. Hinis, S.E. Simopoulos, et al. Natural Radioactivity Mapping of Greek Surface Environment International, 1996, Vol. 22, Suppl. 1, S3- S8, Editor: J.P. McLaughlin, E.S. Simopoulos, F. Steinhäusler.
Ravisankar, R., Chandrasekaran, A., Vijayagopal, P., et al. Natural radioactivity in soil samples of Yelagiri Hills, Tamil Nadu, India and the associated radiation hazards, Radiation Physics and Chemistry, 2012, 81, 1789-1795.
Chiozzi P., P. De Felice, A. Fazio, Pasquale, V.; Verdoya, M. Laboratory application of NaI (Tl) γ-ray spectrometry to studies of natural radioactivity in geophysics, Applied Radiation and Isotopes, 2000, 53, 127-132.
Mehra, R., Singh, S. and Singh K. Analysis of 226Ra, 232Th and 40K in soil samples for the assessment of the average effective dose, Indian J. Phys., 2009, 83 (7), 1031- 1037.
Hamby, D. M., Tynybekov, A.K. Uranium, thorium and potassium in soils along the shore of lake Issyk-Kyol in the Kyrghyz Republic, Environ. Monitoring Assessment, 2000, 73, 101–108.
UNSCEAR, Sources, Effects and Risks of Ionizing Radiation Report of the United Nations Scientific Committee on the Effects of Atomic Radiation to the General Assembly. United Nations, New York, 2000.
Beck, H. L. Physics of Environmental Gamma Radiation Fields. The Natural Radiation Environment 2, USERDA Report CON-720805-P2, 101-134, 1972.
TAEK, Türkiye’deki Çevresel Radyoaktivitenin İzlenmesi 2009, Technique Report, Ankara 9-14, 2010.
Turhan Ş., Köse A., Varinlioğlu A., et al. Distribution of terrestrial and anthropogenic radionuclides in Turkish surface soil samples, Geoderma, 2012, 187–188, 117– 124.
Akhtar N., M. Ashraf, M. Tifail, et al. Radiometric and Chemical Analysis of Saline Soil Samples of Pacca Anna, Faisalabad, Journal of Research, 2003, 14(1), 49-59.
Karahan, G., Bayülken, A. Assessment of Gamma Dose Rates Around İstanbul (Turkey), Journal of Environmental Radioactivity, 2000, 47, 213-221.
Erees, F.S., Akozcan, S., Parlak, Y., et al. Assessment of dose rates around Manisa (Turkey), Radiation Measurements, 2006, 41, 598–601.
Kurnaz, A., Kücükömeroğlu, B., Keser, et al. Determination of radioactivity levels and hazards of soil and sediment samples in Fırtına Valley (Rize, Turkey), Applied Radiation and Isotopes, 2007, 65, 1281– 1289.
Kam, E., Bozkurt, A. Environmental radioactivity measurements in Kastamonu Region of northern Turkey, Applied Radiation and Isotopes, 2007, 65, 440–444.
Bozkurt, A. Yorulmaz, N., Kam, E., et al. Assessment of environmental radioactivity for Sanliurfa region of Southeastern Turkey, Radiation Measurements, 2007, 42, 1387– 1391.
Değerlier, M, Karahan, G., Özger, G. Radioactivity concentrations and dose assessment for soil samples around Adana, Turkey, Journal of Environmental Radioactivity, 2008, 99(7), 1018–1025.
Çelik, N., Çevik, U., Çelik, A., Kücükömeroglu, B. Determination of indoor radon and soil radioactivity levels in Giresun, Turkey, Journal of Environmental Radioactivity, 2008, 99, 1349–1354.
Taskin H., Karavus, M., Ay, P., et al. Radionuclide concentrations in soil and lifetime cancer risk due to gamma radioactivity in Kirklareli, Turkey, Journal of Environmental Radioactivity, 2009, 100, 49-53.
Kücükömeroğlu, B., Yeşilbağ, Y.O., Kurnaz, et al. Radiological characterization of Artvin and Ardahan provinces of Turkey, Radiation Protection Dosimetry, 2011, 145(4), 389–394.
Kurnaz, A., Kücükömeroğlu, B., Damla, N., et al. Radiological maps for Trabzon, Turkey, Journal of Environmental Radioactivity, 2011, 102, 393-399.
Cengiz, G. B., Reşitoğlu, S. Determination of natural radioactivity levels in Kars City center, Turkey, Journal of Nuclear Sciences, 2014, 1, 32-37.
Cengiz, G. B., İ. Çağlar. Determination of the Health Hazards and Life time Cancer Risk Due to Natural Radioactivity in Soil of Akyaka, Arpaçay and Susuz Areas of Kars, Turkey, International Journal of Scientific &Engineering Research, March 2016, 7(3), 619-626.
Selvasekarapandian S., R Sivakumar, NM Manikandan, et al. Natural radionuclide distribution in soils of Gudalore, India, Applied Radiation and Isotopes 2000, 52, 299-306.
Y. Yang, X. Wu, Z. Jiang, et al. Radioactivity concentrations in soils of the Xiazhuang granite area China, Appl. Radiat. Isot., 2005, 63, 255–259.
Agbalagba, E. O, Avwiri, G.O, ChadUmoreh, Y.E. γ-Spectroscopy measurement of natural radioactivity and assessment of radiation hazard indices in soil samples from oil fields environment of Delta State, Nigeria, Journal of Environmental Radioactivity, 2012, 109, 64-70.
Daryoush Shahbazi-Gahrouei. Natural Background Radiation Dosimetry in the Highest Altitude Region of Iran, Journal of Radiation Research, 2003, 44, 285-287.