RADIATION SHIELDING PARAMETERS OF DY3+ DOPED CALCIUM ALUMINUM BARIUM SODIUM BORATE GLASS SYSTEM USED FOR RADIATION PROTECTION IN HOSPITALS

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Yıldız Teknik Üniversitesi, Elektrik-Elektronik Fakültesi, Biyomedikal Mühendisliği, Türkiye

Tezin Onay Tarihi: 2024

Tezin Dili: İngilizce

Öğrenci: Ayşenur KÜTÜK

Danışman: Osman Günay

Özet:

Due to its harmful effects on human health, ionising radiation and the investigation of the radiation protection capability of radiation-affected materials have become important for contemporary research. The damage caused to tissues by ionising radiation varies, depending on the amount of radiation exposure and the radiosensitivity of the target. Radiation safety procedures (a.k.a. ALARA) include reducing the exposure time, increasing the distance between the radiation source and the target, and using radiation shielding materials. Lead and concrete, two extensively employed radiation shielding materials, have considerable disadvantages, including both of them being opaque, lead being toxic, and concrete breaking and losing its moisture. Glass, on the other hand, stands out as an alternative to lead and concrete with its transparency, high homogeneity, wide thickness range and relatively simple production. Glass modifiers can be added to the system to increase the absorption capacity of the glass and at the same time reduce the melting point and viscosity of the system without changing its chemical properties.

This thesis assesses the shielding properties of the  (x=0.1, 0.3, 0.5, and 1.0% mol) glass system doped with the rare earth element Dysprosium(III) ion (Dy³⁺) at various concentrations against ionizing radiation. To evaluate the system, linear attenuation coefficient ( ), mass attenuation coefficient ( ), half-value layer ( ), tenth-value layer ( ), mean free path ( ), atomic cross section ( ), electronic cross section ( ), effective atomic number ( ), effective electron densities ( ), effective conductivity ( , equivalent atomic number ( ), exposure build-up factor ( ), and energy absorption build-up factor ( ) radiation protection parameters are reviewed. All four glass samples were made using the standard melt-quenching technique. The glass samples were tested as a shielding material against ionizing radiation using Phy-X/PSD software. The findings in this study demonstrate that Dy³⁺ doped Calcium Aluminum Barium Sodium Borate glass system can be employed efficiently as a radiation shielding material since it has been proven to be a suitable, effective and good alternative.