Yazar "Tozar, Ali" seçeneğine göre listele

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    Öğe
    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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    Öğe
    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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    Öğe
    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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    Öğe
    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.