Zeki Ünal Yümün

A Study of Background Radioactivity Level for Edirne, Turkey

The main purpose of this study is to measure the outdoor gamma dose rates of central district of Edirne and to calculate the annual effective dose equivalent to the public. For this aim, Measurements were taken with a plastic scintillation detector SP6 (via using portable counter ESP2, Eberline) from 14 different points in central district of Edirne. According to the calculations, the lowest gamma concentration was measured to 19,6 nGy/h while the highest value was measured to 60 nGy/h. The gamma dose average of 14 points was calculated to 38,5 nGy/h. And, the average annual effective dose equivalent to the public was calculated to 47,3 μSv/y. The impressions obtained about the region were evaluated in terms of live health.

Gross Alpha and Gross Beta Activity Concentrations in Sediments in Gulf of Izmir (Eastern Aegean Sea, Turkey)

The concentration of gross alpha and gross beta radioactivity were analyzed in current sediments of the Gulf of Izmir (Eastern Aegean Sea). The sediments were collected from four different locations where are very wealthy in terms of industry on the coast of the Gulf of Izmir. Each processed sample was determined for gross alpha and gross beta radioactivity by using a low-background counter (Berthold, LB 770 10- channel a - b low-level counter). The obtained results show that natural gross alpha and gross beta activity concentrations in the drilling cores range from 537 ± 77 to 1800 ± 207 Bq kg -1 and 993 ± 60 to 1842 ± 102 Bq kg -1 , respectively. These results were compared with previous studies throughout the world, and the study could be a reference data for the future research related to radiological mapping or environmental monitoring in the area.

Stratigraphic and Geochemical Characteristics of Kulakçayiri Lake (Istanbul/Turkey) And Its Vicinity

This study investigated the trace element potential of stratigraphic units in Kulakcayiri Lake and its vicinity, in Arnavutkoy. In this context, trace element analysis was carried out using three drilling samples taken from Kulakcayiri Lake. In addition, grain size distribution analyses were performed to determine the lithological properties of the drilling samples in the stratigraphic sequence. At the base of the lake bed, there is a distribution of sediment consisting of clay from 3 to 6.5 m thick, and at deeper levels, clayey sand, or sandy clay. In the analyses, nineteen separate elements and CaO, TiO2 and Fe2O3 concentrations were determined using X-ray spectrometry methods. Wavelength Dispersive X-Ray Fluorescence Spectrometry (WDXRF) was used for these measurements. As a result of the elemental analysis, heavy metals including cobalt (Co), nickel (Ni), copper (Cu), lead (Pb), chromium (Cr), and radioactive elements including uranium (U) and thorium (Th), were detected in the sediments. In addition, rare metals (lanthanum, cerium and neodymium) of the lanthanide group were also found. In particular, the elevation of the Pb concentration in the BH-1 drilling location is remarkable. This height is due to the sediment structure around the natural lake.