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    Annual effective dose and concentration levels of gross ? and ? in Turkish market tea
    (Novim Medical Radiation Institute, 2012) Görür, F.K.; Keser, R.; Akçay, N.; As, N.; Dizman, S.
    Background: Tea is one of the most popular beverages all over the world which is prepared from the leaves of a shrub camellia sinensis. Eastern Black Sea Region of Turkey which account for around 100% of all tea production in Turkey was among the areas contaminated by Chernobyl accident. Materials and Methods: A comprehensive study was planned and carried out to determine the level of gross ? and ? radioactivity and annual effective dose equivalent in different Turkish market tea using LSC. Results: The average measurements for digestion and infusion are 5.0 mBql -1 and 1.8 mBql-1 for gross ?, 80.7 mBql-1 and 9.0 mBql-1 for gross ? in tea samples. Contributions of the infusion tea samples to total annual effective dose equivalent from 238U234U230Th226Ra, 210Po232Th238Th210Pb and 228Ra are 0.103, 0.112, 0.480, 0.640, 2.742, 0.525, 0.164, 7.740 and 7.740 ?Svy-1 for adults. Conclusion: The obtained results showed that natural activity concentrations of ?- and ?-emitting radionuclides and annual effectivedose equivalent in tea samples did not exceed WHO recommended levels.
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    Annual effective dose and concentration levels of gross alpha and beta in Turkish market tea
    (Ijrr-Iranian Journal Radiation Res, 2012) Görür, Filiz Korkmaz; Keser, R.; Akçay, N.; As, N.; Dizman, Serdar
    Background: Tea is one of the most popular beverages all over the world which is prepared from the leaves of a shrub camellia sinensis. Eastern Black Sea Region of Turkey which account for around 100% of all tea production in Turkey was among the areas contaminated by Chernobyl accident. Materials and Methods: A comprehensive study was planned and carried out to determine the level of gross alpha and beta radioactivity and annual effective dose equivalent in different Turkish market tea using LSC. Results: The average measurements for digestion and infusion are 5.0 mBql(-1) and 1.8 mBql(-1) for gross alpha, 80.7 mBql(-1) and 9.0 mBql(-1) for gross beta in tea samples. Contributions of the infusion tea samples to total annual effective dose equivalent from U-238, U-234, Th-230, Ra-226, Po-210, Th-232, Th-238, Pb-210 and Ra-228 are 0.103, 0.112, 0.480, 0.640, 2.742, 0.525, 0.164, 7.740 and 7.740 mu Svy(-1) for adults. Conclusion: The obtained results showed that natural activity concentrations of alpha- and beta-emitting radionuclides and annual effective dose equivalent in tea samples did not exceed WHO recommended levels. Iran. J. Radiat. Res., 2012; 10(2): 67-72
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    Evaluation and mapping of radioactivity and radiological risks in sediments before the nuclear power plant in Türkiye
    (Springer, 2024) Dizman, S.; Kart, D.; Yesilkanat, C. Mert; Keser, R.; Gorur, F. Korkmaz
    The main aim of this study was to investigated background levels of radioisotopes 137Cs (Cesium), 232Th (Thorium), 40K (Potassium), and 226Ra (Radium) in all samples taken from two important rivers of the Sinop province prior to the nuclear power plant. The sediment samples were taken from the Karasu (80 km) and Kabali (51.3 km) rivers at 2 km distances in July 2019, the month with the least precipitation, and in December 2018, the month with the most precipitation, before the nuclear power plant built in the Sinop province became active. The concentrations of 226Ra, 232Th, 137Cs and 40K in the collected sediment samples were measured using a high purity germanium detector (HPGe). The activity concentrations of 226Ra, 232Th, 137Cs and 40K in the sediment samples taken from the Karasu River in December and in July were in the range of 3.08-29.40 Bq/kg, 2.95-19.10 Bq/kg, 0.35-61.13 Bq/kg and 54.83-495.02 Bq/kg, respectively. In the sediment samples collected from the Kabali River in December and in July, 226Ra, 232Th, 137Cs and 40K activity concentrations were in the range of 5.79-25.65 Bq/kg, 3.35-19.55 Bq/kg, 0.97-7.23 Bq/kg and 141.66-446.77 Bq/kg, respectively. Some risk parameters were also calculated to assess radiological hazards. These values were found to be lower than the world averages recommended by international organizations. Based on all the results obtained, it can be concluded that the examined samples do not pose a radiological risk.