Spectral luminescence of fossil coral: A Multi-Analytical approach

This study investigates the luminescence properties of calcite within coral skeletons collected from Pulau Redang, Malaysia, focusing on the effects of gamma irradiation. Using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Raman Spectroscopy, and luminescence measurements, we examined structural and compositional changes in corals subjected to varying doses of gamma radiation. Present results indicate significant lattice disorder and structural breakdown at higher radiation doses, evidenced by increased porosity and altered elemental composition. Despite these changes, specific luminescent properties persisted, suggesting a degree of adaptability in the coral calcite. Thermoluminescence (TL) and photoluminescence (PL) analyses revealed that gamma irradiation created new electron traps, maintaining luminescence despite structural disruptions. The study highlights potential risks to coral structural integrity due to radiation while also revealing an inherent resilience in luminescent properties. These findings provide valuable insights into the effects of environmental stressors on coral calcite, informing conservation strategies aimed at preserving coral reefs under changing conditions.