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    A Comprehensive Research on Gamma-Ray Attenuation Characteristics of The Metal-Doped Hap and Natural Animal Bone
    (2020) Köksal, Oğuz Kağan; Cengiz, Erhan; Tozar, Ali; Karahan, İsmail Hakki; Apaydın, Gökhan
    This investigation focuses on the gamma ray attenuation parameters of natural animal bone, iron, cobalt, copper andzinc doped Nano hydroxyapatite artificial bone powders and pure hydroxyapatite. The present specimens were excitedby means of gamma ray photons with 59.5 keV energy radiated from a 241-Amercium annular radioactive source with50 mCi activity by means of narrow beam transmission geometry. The transmitted gamma-rays were counted withusing Ultra Low Energy Germanium (Ultra-LEGe) detector with a resolution 150 eV at 5.95 keV. The gamma-rayattenuation characteristics such as mass attenuation coefficient (MAC) (µ/?), linear attenuation coefficient (LAC) (µ),half value layer (HVL), tenth value layer (TVL) and mean free path (MFP), which has a significant role in theattenuation studies, are also calculated. The values obtained were checked with the predicted values from the XCOMNIST. The results show that the attenuation data of the metal-doped hydroxyapatite synthetic bone dust is very close tothe value of the natural animal bone.
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    A research on the gamma ray attenuation characteristics for real bone and manganese substituted artificial bone dust
    (2020) Köksal, Oğuz Kağan; Tozar, Ali; Cengiz, Erhan; Karahan, İsmail Hakki; Apaydın, Gökhan
    This research focalized on the gamma ray attenuation charesteristics of real bone andHistory:manganese substituted Nano hydroxyapatite artificial bone dusts. The current samples wereReceived:24.03.2019excited with using 59.5 keV photons emitted from an 241Am annular radioisotope source withAccepted:29.01.202050 mCi activity by using a narrow beam transmission geometry and detected with using UltraKeywords:Low Energy Germanium detector with a resolution 150 eV at 5,95 keV experimentally. TheAttenuationgamma-ray attenuation parameters such as linear attenuation coefficient, half value layer, tenthcharesteristics, Mnvalue layer and mean free path are also calculated experimentally and theoretically. Thesubstituted artificialpresent results points out that the attenuation values of the manganese substitutedbone dust, Real bone,hydroxyapatite artificial bone dust is very close to the value of the real bone.Transmission
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    Analysis the Metal Composition of Fish Samples Collected From Karacaören II Dam Lake
    (2024) Köksal, Oğuz Kağan; Apaydın, Gökhan; Cengiz, Erhan; Sirin, Murat; Baltaş, Hasan; Çakmak, Eyüp; Tirasoglu, Engin
    The objective of this study was to analyze the metal content in the organs of Oncorhynchus mykiss, commonly known as rainbow trout, at 12 different locations within the cages located in Karacaören II Dam Lake. The metal contents in fish samples were analyzed using a PANalytical Epsilon5 energy dispersive X-ray fluorescence (EDXRF) spectrometer. We will analyze the findings by displaying the fluctuating metal concentrations in various internal organs over the seasons.
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    Assessment of natural radioactivity and radiological risk of sediment samples in Karacaören II dam Lake, Isparta/Turkey
    (Alanya Alaaddin Keykubat Üniversitesi, 2019) Apaydın, Gökhan; Köksal, Oğuz Kağan; Cengiz, Erhan; Tıraşoğlu, Engin; Baltaş, Hasan; Karabulut, Kazım; Söğüt, Ömer
    This research aimedto assess natural radioactivity levels in lake sediment of Karacaören II Dam.In this study sediment samples were collected from 12 station of lake in May,2016. The natural radionuclides 226Ra, 232Th and 40K were measured with a coaxialHPGe detector (Canberra, GC 1519 model) of 15% relative efficiency and aresolution of 1.9 keV at the 1332 keV gamma of 60Co. In order to assess the radiological hazards resulting from naturalradioactivity, radium equivalent activities (Raeq), absorber dose rate (D), internal (Hin)and external (Hex) hazard index,annual effective dose rate (AED) andExcess life time cancer risk (ELCR)were calculated and compared with recommended values of internationalorganizations.
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    Assessment of the mass attenuation parameters with using gamma-rays for manganese substituted nano hydroxyapatite
    (Pergamon-Elsevier Science Ltd, 2019) Köksal, Oğuz Kağan; Apaydın, Gökhan; Tozar, Ali; Karahan, İsmail Hakkı; Cengiz, Erhan
    Manganese substituted hydroxyapatite nanoparticles (nMnHAp) were produced using the ultrasonic wet chemical method. The elemental analysis was performed using Scanning Electron Microscopy (SEM) with integrated Energy Dispersive X-ray Spectrometry (EDX). The mass attenuation coefficients of manganese substituted hydroxyapatite nanoparticles have been measured at 59.5 keV gamma energy emitted from Am-241 radioisotope annular source with 50 mCi activity by using Ultra Low Energy Germanium Detector. These values are found to be in good agreement with theoretical values based on calculated XCOM data. Electron densities and effective atomic numbers were calculated by using the mass attenuation coefficients. Also, the mass attenuation coefficient of the real bone was determined as experimentally. The obtained results may provide information on how much radiation is transmitted through the sample when they are exposed to gamma-rays at 59.5 keV by comparing real bone.
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    Determination of valence electronic structure of Ni in Ni-B alloy coatings using K-beta-to-K-alpha X-ray intensity ratios
    (Pergamon-Elsevier Science Ltd, 2019) Cengiz, Erhan; Köksal, Oğuz Kağan; Apaydın, Gökhan; Karahan, İsmail Hakkı; Ünal, Ersin
    In this study, K-beta-to-K-alpha X-ray intensity ratios of Ni in Ni-B alloy coatings were investigated. These samples were excited by 59.5 keV gamma-rays from a Am-241 annular radioactive source. K X-rays emitted by the samples were counted using an Ultra-LEGe detector with a resolution of 150 eV at 5.9 keV. The K-beta-to-K-alpha X-ray intensity ratios of Ni-B alloys are compared with pure Ni and each other. Deviations between the results were explained by the change in valence electronic structures of Ni in Ni-B alloy coatings.
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    Elemental analysis for iron, cobalt, copper and zinc decorated hydroxyapatite synthetic bone dusts by EDXRF and SEM
    (Elsevier Science Bv, 2019) Köksal, Oğuz Kağan; Wrobel, Pabel; Apaydın, Gökhan; Cengiz, Erhan; Lankosz, Marek; Tozar, Ali; Özkalayci, Fatih
    Iron, cobalt, copper and zinc decorated hydroxyapatite nanoparticles were produced with using ultrasonically assisted wet chemical method. Calcium nitrate tetra hydrate and dibasic ammonium phosphate were used as calcium and phosphorous source, respectively. Calcium nitrate tetra hydrate and dibasic ammonium phosphate solutions were prepared by dissolving the salts in distilled water and at different concentrations of decorated elements (iron, cobalt, copper and zinc) were appended to the calcium nitrate tetra hydrate solution. Stoichiometric decorated hydroxyapatite nanoparticles were analysed by energy dispersive X-ray fluorescence (EDXRF) with using standard method and the element analysis was determined with looking at the grain structures by Energy Dispersive X-Ray (EDX) and scanning electron microscopy (SEM). Not only have the concentrations of decorated metals but also calcium and phosphorus ratio for artificial bone powders been determined. As a result, calcium and phosphor ratio and metal decorated contents were evaluated according to the production values and compared previous studies. The answer to the question of how much of the contribution amounts was searched.
  • Küçük Resim
    Öğe
    Evaluation of ecological risk, source, and spatial distribution of some heavy metals in marine sediments in the Middle and Eastern Black Sea region, Turkey
    (2022) Apaydın, Aylin; Kabaoğlu, Hatice; Apaydın, Gökhan; Şirin, Murat; Cengiz, Erhan; Köksal, Oğuz Kağan; Baltaş, Hasan; Tıraşoğlu, Engin
    In the present study, the concentration levels of heavy metals such as Mn, Fe, Ni, Cu, Zn, Cr, and Pb in sediment samples collected from 16 sampling locations in the Middle and Eastern Black Sea regions, Turkey, were measured using energy dispersive X-ray fluorescence spectroscopy (EDXRF). Various pollution parameters and methods, such as the enrichment factor (EF), geo-accumulation index (Igeo), contamination factor (CF), pollution load index (PLI), ecological risk index (RI), and geo-spatial distribution patterns, were used to assess the pollution status, ecological risks, and sources of metals in sediment in detail. The mean concentrations of Mn, Fe, Ni, Cu, Zn, Cr, and Pb were found to be 565.38, 46,000, 34.38, 104.06, 109.88, 87.31, and 32.31 mg/kg, respectively. Results showed that the mean concentrations of Cu, Zn, and Pb exceeded the crustal shale value, with the exception of Mn, Fe, Ni, and Cr. According to the calculated pollution parameters, although minimal or moderate pollution was detected in the area investigated, it was determined that there was a very low ecological risk. Multivariate statistical analysis results showed that Cu, Zn, and Pb levels in the investigated region were slightly influenced by anthropogenic inputs such as mining and agricultural practices. In addition, the geo-spatial distributions of Cu, Zn, Fe, and Pb were found to be higher in this region due to the mining activities carried out in the Eastern Black Sea region.
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    Exploration of Seasonal Metal Pollution in Karacaören II Dam Lake Sediment Samples using X-ray Fluorescence Method
    (2023) Apaydın, Gökhan; Köksal, Oğuz Kağan; Cengiz, Erhan; Sirin, Murat; Baltaş, Hasan; Tirasoglu, Engin
    In this study, the seasonal metal pollution of sediment samples taken from twelve distinct notes of the Karacaören II Dam Lake was examined. The quantity of metal in soil samples was determined using energy dispersive X-ray fluorescence spectroscopy. The geoaccumulation index and enrichment factor expressions were created using the metal concentrations found in the sediments. Seasonal values at the local, state, and international levels were compared to the findings. The ratios of the elements copper, zinc, lead, arsenic, nickel, chromium, and mercury, measured in parts per million (ppm), were found to be 42-96, 53-78, 11-14, 4-7, 233-244, and 611-711, respectively. There is also discussion of the sediments' elemental composition and degree of pollution. In contrast, it was found that the Urbach energy increased from 0.246 eV to 0.630 eV with increasing levels of V2O5. These synthetic glasses' densities and molar volumes were also investigated and discussed.