Abstract
The present work utilizes in situ gamma ray spectrometric measurement data to map the surface geology of Sarıhan Granitoid and its surrounding area. The study area comprises three different lithological units, namely, Hozbirikyayla Formation (limestone and sandy limestones), Sarıhan Granitoid (consist of quartz monzodiorite, granodiorite and quartz diorite) and the Ophiolitic olistostromal melange (andesite, basalt, sandstone, gravelly sandstone). When lithological units are assessed according to the radioactivity characteristics, natural radionuclide contents (40K and radionuclides from 238U and 232Th series) of Hozbirikyayla limestones and ophiolitic melange rocks are lower than the Sarıhan pluton. The U, Th and K radionuclide contents were found to be 0.8–5.4 ppm, 10.1–33.6 ppm and 1.29–4.41% in the Sarıhan plutonic area and 0.9–5.3 ppm, 1.1–20.3 ppm and 0.04–2.71% in Horzbirikyayla formation, respectively. The element concentrations of 238U, 232Th and 40K of the Ophiolitic melange are 1.1–4.5 ppm, 1.6–25.3 ppm and 0.09–3.63%, respectively. Radioelement ratio maps are created for the studied area, because the parameters of radioelement ratios, eU/eTh, eU/K and eTh/K, reflect the radioactive characters of the rock and soil. The Hozbirikyayla Formation is characterized by the highest value of eU/eTh and lowest value of eTh/K. While the lowest eU/eTh and eU/K ratios were observed in the Sarıhan Granodiorite, the highest value of eU/K and eTh/K were obtained in the Ophiolitic olistostromal melange. By comparing these maps with the geology, it was found that the radioelement concentrations are in good agreement with the geological properties of the region. In addition to this, the radiation hazard parameters were evaluated to assess the radiation hazard for people living in this area. It has also been found that there is no significant radiologic hazard for humans and the environment in and around studied area.
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Acknowledgments
We would bluntly like to express our gratitude to the reviewers and the editor of the Journal, for their helpful criticism and detailed discussions and suggestions that improved the text. Grateful thanks are offered to the provider of financial support for the research presented here: Karadeniz Technical University Scientific Research Project (Project no: BTAP-9588). The authors also would like to thank undergraduate students; İnci Gökçelik, Metin Yılmaz and Ufuk Çoban for assisting during field work.
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Çınar, H., Altundaş, S., Çelik, N. et al. In situ gamma ray measurements for deciphering of radioactivity level in Sarıhan pluton area of northeastern Turkey. Arab J Geosci 10, 435 (2017). https://doi.org/10.1007/s12517-017-3225-4
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DOI: https://doi.org/10.1007/s12517-017-3225-4