Akademik Veri Yönetim Sistemi
RADIATION PHYSICS AND CHEMISTRY, cilt.238, 2026 (SCI-Expanded)
The present study investigates the structural, optical, and radiation shielding properties against gamma rays, charged particles, and neutrons of the (75-x)B2O3 + 10Bi2O3 + 5Na2O + 10Al2O3 + xTb4O7 (x = 0, 1, 2, 3, 4 mol%) glass system. Experimental measurements included mass and linear attenuation coefficients (MAC and LAC), mean free path (MFP), half-value layer (HVL), and neutron absorbed dose rates. Theoretical calculations of shielding parameters were performed using EpiXS software. Additionally, mass stopping power and projected ranges for protons and alpha particles were obtained via the SRIM program. Raman spectroscopy revealed the vibrational modes, elucidating the molecular structure and bonding. UV-Vis spectroscopy assessed optical absorption and transparency, essential for applications requiring specific light transmission. FT-IR analysis identified various functional groups and bonding patterns. Both FT-IR and Raman results confirmed complex structural features, including Bi-O-Bi linkages in [BiO6] units, B-O-B connections, metaborate chains, and borate rings, highlighting the structural diversity of borate and bismuth groups. UV-Vis analysis showed direct and indirect band gaps ranging from 2.19 to 2.68 eV and 1.67-2.03 eV, respectively. The refractive index varied between 2.48 and 2.65, while the optical dielectric constant ranged from 5.15 to 6.02, indicating excellent optical transmission and structural compactness. It is noteworthy that incorporating 1 mol% Tb4O7 resulted in a 20.47 % enhancement of the MAC at 59.54 keV, while the increase was marginal-only 3.52 %-at 609.3 keV. When the concentration was raised to 4 mol%, the improvements reached 97.4 % at 59.54 keV and 8.45 % at 609.3 keV. These findings demonstrate that increasing Tb4O7 content significantly enhances the gamma shielding efficiency of the glass samples.