Browsing by Author "Kurnaz, Aslı"
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Pubmed Assessment of internal radiation exposure caused by radon in commercially bottled spring waters consumed in Turkey.(2023-05-11T00:00:00Z) Turhan, Şeref; Kurnaz, Aslı; Aydın, ErolThe variation of dissolved radon levels in water supplies remains of interest since radon ingested through drinking water can give considerable radiation to the lining of the stomach. This study aims to determine the radon concentration levels in bottled spring drinking water (BSW) brands commercially sold in Turkey using a radon gas monitor and to assess the internal radiation exposure caused by the ingestion and inhalation of radon. The activity concentrations of radon analyzed in 77 BSW brands varied from 7.1±0.8 to 28.7±2.7 mBq/L with an average of 15.7±5.1 mBq/L. The total annual effective dose was estimated to assess the radiological risk for three age groups in four different scenarios based on annual drinking water intake. All estimated dose values are well below the recommended reference dose of 100 µSv for drinking water. Therefore, radon gas in the investigated BSW samples poses no significant radiological risk to the public.Pubmed Assessment of the Enrichment of Heavy Metals in Coal and Its Combustion Residues.(2022-06-21T00:00:00Z) Altıkulaç, Aydan; Turhan, Şeref; Kurnaz, Aslı; Gören, Elif; Duran, Celalettin; Hançerlioğulları, Aybaba; Uğur, Fatma AysunCoal-fired thermal power plants remain one of the main sources of electricity generation in Turkey. Combustion of coal creates coal ash and slag, which are often stored in landfills located near residential and agricultural fields, increasing the potential for high environmental contamination and health risks. This study investigates the content and enrichment factor (EF) of heavy metals in pulverized lignite coal and its combustion residues from the Kangal lignite coal-fired thermal power plant situated in the Central Anatolian Region of Turkey. The concentration of heavy metals (Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Sr, Zr, Cd, Hg, and Pb) in lignite coal, slag, and fly ash samples were analyzed using an energy dispersive X-ray fluorescence technique. The concentration of Fe is highest while Hg concentration is lowest in the samples. The concentrations of heavy metals are higher in slag and fly ash samples than in lignite coal. Average values of EF (related to Earth's crust average) revealed that extreme enrichment has been shown by arsenic and mercury in lignite coal and fly ash samples while very high enrichment has been shown in slag samples.Pubmed Evaluation of terrestrial radionuclide levels and concomitant radiological risks of bentonites used in many industries.(2022-09-03T00:00:00Z) Kurnaz, Aslı; Turhan, Şeref; Metin, Onur; Altıkulaç, Aydan; Duran, CelalettinBentonite is a soft, porous, easily shaped, and absorbent material rich in aluminum, sodium, and potassium. Bentonite is a mineral widely utilized as drilling mud, ore pelletizing, absorbent/adsorbent, bleaching agent, water impedance, coating, and raw material in various industries. In this study, radiometric measurements of 90 bentonite samples collected from 21 quarries in Turkey were performed using gamma-ray spectrometry. The radiological hazards caused by indoor exposure to adults due to the utilization of bentonites as raw materials in the construction industry and outdoor external exposures to quarry workers were evaluated by estimating the activity concentration index, annual effective doses, and lifetime cancer risk. The average activity concentrations of Ra, Th and K measured in bentonite samples were found as (50 ± 5) Bq/kg, (76 ± 4) Bq/kg and (373 ± 19) Bq/kg, respectively. The evaluation results reveal that the bentonites examined could be safely utilized as raw materials.Pubmed Heavy metal contamination and health risk evaluation of chestnut ( Miller) consumed in Turkey.(2022-05-12T00:00:00Z) Turhan, Şeref; Turfan, Nezahat; Kurnaz, AslıThis study was performed to determine heavy metals and metalloids in twenty-eight chestnut ( Miller) samples consumed in Turkey by inductively coupled plasma optical emission spectrometry and evaluate health risks for humans through the consumption of chestnut samples. The concentrations of Cd, Cr, Co, Cu, Fe, Pb, Mn, Ni and Zn analyzed in chestnut samples varied from 537 to 635, 608 to 5333, 347 to 972, 207 to 8619, 12,739 to 86,310, 278 to 7549, 8676 to 67,622, 1068 to 18,661 and 3625 to 12,876 µg/kg (dry weight), respectively. The concentrations of Cd and Pb were above the maximum limits determined by the Turkish Food Codex. Healthy risks caused by the heavy metals in the consumed chestnut samples were evaluated by estimating the average daily intake of metal, health risk index (HRI), and total HRI. These results revealed that there is no possible health risk to consumers due to the intake of chestnut samples studied under the current consumption rate.Pubmed Natural Radionuclides in Bottled Mineral Waters Consumed in Turkey and Their Contribution to Radiation Dose.(2022-09-27T00:00:00Z) Altıkulaç, Aydan; Kurnaz, Aslı; Turhan, Şeref; Kutucu, MetehanBottled natural mineral water (BMW) consumption in Turkey is increasing every year. Depending on the local geology from which the water is extracted, BMW could be enhanced with natural radionuclides. In this study, the activity concentrations of natural radionuclides in 58 BMW samples of 25 different brands marketed in Turkey were measured using a γ-ray spectrometer with high-purity germanium (HPGe) detector. The average activity concentrations of Ra, Ra, and K in BMW samples were found as 0.4, 0.5, and 4.3 Bq/L, respectively. The activity concentrations of Ra exceeded the WHO-recommended maximum permissible limit of 0.1 Bq/L for drinking water. The annual effective dose (AED) and excess lifetime cancer risk (LCR) caused by the ingestion of each BMW sample were estimated for adults to assess radiological risks using two different scenarios based on BMW consumption rates (150 and 13 L/y). All estimated total AEDs, except for two samples, were below the guidance dose level of 100 μSv/y recommended by the World Health Organization (WHO) and Turkish regulations for drinking water. For all BMW brands, Ra was found as the main contributor to the AEDs. The LCR values were lower than the acceptable value of 10 for radiological risks.Pubmed Potentially toxic element contamination and health risk assessment in bottled mineral waters consumed in Turkey.(2022-07-26T00:00:00Z) Turhan, Şeref; Kurnaz, AslıThis study aimed to evaluate the human health risk posed by potentially toxic elements (PTEs) in 59 bottled mineral water (BMW) samples of 25 different brands marketed in Turkey. The concentrations of Ag, Al, As, Cd, Cr, Co, Cu, Fe, Mn, Ni, and Pb in the BMW samples were analyzed using an ICP-OES and compared with maximum allowable concentrations (MACs). A higher concentration of As than MAC was detected in five BMW samples. The concentrations of Cd, Pb, Cr, Ni, and Al in the majority of BMW samples are higher than the MACs. The human health risk was evaluated for adults estimating non-carcinogenic risk index (HI), incremental lifetime cancer risk (ILCR) and total cancer risk (TCR). All HI values estimated for PTEs in BMW samples are less than one, except for one sample. ILCR values for Cd in approximately half of the BMW samples are above the upper limit.Item Radon Level in Dwellings of Trabzon-Turkey(2011) Kurnaz, Aslı; Küçükömeroğlu, Belgin; Çelebi, NilgünIn this study, the indoor radon levels have been determined in Trabzon in Eastern Blacksea of Turkey. There is no information about indoor radon concentrations in the dwellings of Trabzon so far. For this reason, passive solid state nuclear track dedectors (SSNTD type CR-39) were distributed to 97 randomly chosen houses in Trabzon. The average radon concentration was found to be 34.44 Bq m-3. The result have been compared with other indoor radon concentration measurements in different part of the world and also compared to international recommended values. This study is the part of the series of studies investigating the indoor radon concentrations in buildings of Turkey.
