Konferans bildirisi / sunumu

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Browsing Konferans bildirisi / sunumu by Category "Makale- Uluslararası- Editör Denetimli Dergi"

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    Impact of Extractant Type and pH on Yttrium Recycling from End of Life Fluorescent Lamp
    (Scopus, 2023-11-14) Koç Delice, Tülay; Türker, Gülşah; Obuz, Hüseyin Eren; Soydaş Sözer, Belma
    Rare-earth elements (REEs), which are indispensable for high technology and renewable energy, are becoming more significant due to their distinct properties (e.g., catalytic, metallurgical, magnetic, etc.) and their diverse applications in a wide range of contemporary technologies, environmental initiatives, and economic domains. In the pursuit of an environmentally friendly, sustainable, circular approach, recycling and utilizing secondary rare-earth resources as potential reservoirs of REEs may present an alternative to primary mining, addressing future raw material demands. Secondary REE sources include various products such as fluorescent lamps, light-emitting diodes (LEDs), magnets, wind turbines, electric motors, and batteries. Powders used in fluorescent lamps contain approximately 3% phosphorus, and these powders comprise a high ratio of precious REEs such as Y, Eu, La, Ce, and Tb. This study involves the recovery of yttrium from end-of-life fluorescent lamps. The composition of the end-of-life fluorescent lamp was analyzed using X-ray fluorescence (XRF) and X-ray diffraction (XRD) techniques subsequent to grinding. The leaching process was conducted to investigate the effects of leach parameters on the efficiency of the reaction. In the subsequent phase of the study, a solution obtained with the optimum leaching efficiency was subjected to the purification of Y using the solvent extraction (SX) method. The effect of each different extractant and pH values on Y-recovery were investigated for SX process. Yttrium oxide powders were characterized by XRF and ICP(OES) techniques, and high-purity Y2O3 powders were obtained with high yield.
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    Transfer Factors of 238U, 232Th, 40K, 210 Pb to selected some Crops and radiation impact assessment in Semi Arid Environment
    (Springer, 2024-05-22) Dirican, Abdullah; Dikmen, Hasan; Şahin, Mihriban; Gülay, Yusuf; Özkök, Yücel Özel; Kaya, Nihal; Vural, Mustafa
    Research on the safety of staple agricultural food products has always been one of humanity's priorities and provides input for dose assessment models. Within this important priority, activity concentrations, transfer factors (TF), and radiological effects of 238U, 232Th, 210Pb, and 40 12 K were studied for selected crops in a village close to the NORM area, located in Central Anatolia region of Turkey. The RESRAD-onsite code has been used to assess the total dose rate. The simulation of the risk analysis covered 80 years. The maximum total dose of 0.5 mSv/yr was obtained at t = 30 years.