Akademik Veri Yönetim Sistemi
3. INTERNATIONAL CONGRESS OF MODERN SCIENTIFIC RESEARCH, Ankara, Türkiye, 3 - 05 Haziran 2026, ss.126-135, (Tam Metin Bildiri)
Exposure buildup factor (EBF) and energy absorption buildup factor (EABF) are fundamental dosimetric parameters in radiation shielding, medical physics, and tissue-equivalent material characterization. These factors are particularly important for estimating the contribution of scattered photons in biological tissues, medical phantoms, and shielding materials under gamma-ray irradiation conditions. Accurate determination of buildup factors enables reliable assessment of photon transport and absorbed dose distributions in diagnostic and therapeutic energy regions.
In the present study, the EBF and EABF values of water and Polymethyl Methacrylate (PMMA) were investigated over a wide photon energy range of 0.021–1.25 MeV. The Geometric-Progression (G–P) fitting method was employed for the calculation of buildup factors. Initially, the G–P fitting parameters were determined at standard reference energies using equivalent atomic number (Zeq) interpolation procedures. Subsequently, EBF and EABF values were evaluated for selected radioactive source energies relevant to medical and shielding applications. The obtained results provide comprehensive buildup factor data for water and PMMA, which are widely used as tissue-equivalent materials in radiation dosimetry and radiotherapy studies. The calculated EBF and EABF values are expected to contribute to more accurate photon attenuation, dose estimation, and radiation protection analyses, particularly for therapeutic gamma-ray energies.