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• MakaleAçık Erişim2024/r/gumushane/19972
  İnşaat Malzemesi Olarak Kullanılan Beton Örneklerinde Uçucu Külün Radyasyon Koruma Etkinliği Üzerindeki Etkilerinin EGS4 Kodu Kullanılarak Hesaplanması

  Esra, Yilmaz Bayrak

  Bu çalışmanın temel amacı, inşaat malzemesi olarak kullanılan beton örneklerinde çimentonun azaltılarak ve yerine uçucu kül kullanılmasının radyasyon koruma etkinliği üzerindeki etkilerini belirlemektir. Beton örneklerinin radyasyon koruma etkinliği, EGS4 kodu kullanılarak hesaplanmış ve teorik olarak XCOM verileri ile karşılaştırılarak tartışılmıştır. 59.5 ile 1332 keV arasındaki gama ışını enerji aralığında, uçucu kül ile karıştırılmış beton örneklerinin kütle soğurma katsayıları (μ/ρ), teorik olarak incelenmiştir; bu inceleme WinXcom ve EGS4 simülasyonlarıyla gerçekleştirilmiştir. Hesaplanan kütle soğurma katsayıları kullanılarak ortalama serbest yol (MFP), yarı değer tabakası (HVL), radyasyon koruma etkinliği (RPE), etkili atom numarası (Zeff) ve gama ışını kerma katsayıları (kγ) gibi çeşitli koruma parametreleri belirlenmiştir. İnşaat malzemesi olarak kullanıldığında betonun bileşiminde çimentonun azaltılması ve uçucu kül eklenmesinin, radyasyon koruma etkinliği üzerinde etkileyici değişikliklere yol açtığı gözlemlenmiştir.

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• MakaleYalnız künye2024/r/gumushane/11427
  Human health risk assessment of heavy metals accumulation in different genders and tissues of whiting fish (Merlangius merlangus euxinus Nordmann, 1840) from Rize, Turkey

  Şirin, Murat; Bayrak, Esra Yılmaz; Baltaş, Hasan

  The contamination of fish resulting from marine pollution is a major concern, as it poses potential adverse effects on human health. Therefore, heavy metal concentrations (Cr, Fe, Ni, Cu, Zn, and Pb) in different genders and tissues (muscle, liver, gonads and gills) of whiting fish collected from fish markets in Rize province were determined by Inductively–coupled plasma optic emission spectrometry (ICP–OES). The concentration ranges of heavy metals in all tissue samples, based on the overall average, were as follows (mg/kg wet weight): Cr: 0.081–0.25, Fe: 2.3–40, Ni: 0.070–0.095, Cu: 0.33–1.01, Zn: 3.0–20, and Pb: 0.015–0.043. The results indicated that the liver and gills exhibited a higher metal accumulation capacity compared to other tissues, whereas the muscle consistently displayed the lowest metal concentrations. The metal concentrations in the muscle were found to be below the maximum permissible levels set by international organizations for seafood. Additionally, calculated estimated daily intake (EDI), metal pollution index (MPI), target hazard quotient (THQ), total exposure hazard index (HI), and target carcinogenic risk (TR) indicate no potential risk to humans from whiting fish consumption.

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• MakaleAçık Erişim2023/r/gumushane/20267
  Determination of Radioactivity Levels in Soil Samples of Recep Tayyip Erdogan University Campus in Rize Province

  Baltaş, Hasan; Esra, Yilmaz Bayrak

  Recep Tayyip Erdogan University Zihni Derin Campus, situated at the Eastern Black Sea Region of Turkey, in the province of Rize, was established on a land area of approximately 3.254.430.28 m². It was found that tea, which was thought to be affected by radiation after the nuclear accident at the Chernobyl Nuclear Power Plant, was buried in sacks in this area, which was used as a tea factory before. Therefore, it is crucial to determine the radiation levels in the campus area. In this study, the quantities of artificial (137Cs), and natural (226Ra, 232Th, and 40K) radionuclides, were assessed using a high purity germanium detector (HPGe) in 15 soil samples collected from the Zihni Derin Campus of Recep Tayyip Erdogan University in Rize. For 226Ra, 232Th, 40K and 137Cs the activity values of soil samples varied from 43.78 to 62.58, 29.85 to 41.61, 132.48 to 346.44 and 3.90 to 202.94 Bq kg-1, respectively. Upon comparison with the average global values provided by the UNSCEAR (2000), it was observed that the mean activity values for 226Ra and 232Th in the soil samples were higher. Conversely, the average activity concentrations for 40K and 137Cs were found to be lower than the world average values reported by UNSCEAR (2000). Furthermore, radiological hazard indexes were calculated and compared with internationally acceptable values. This research demonstrates that there are no health concerns for individuals exposed to the soil samples in the study area.

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