Basic optical and radiation response properties of Lumilass-B fluorescent glass

The optical, scintillation, and dosimetric properties of Lumilass-B fluorescent glass were studied. The glass showed an ultraviolet absorption band that can be attributed to the transition from 4f⁷(₈S _7/2) ground state to the 4f⁶5d excited state of Eu ²⁺ ions in the glass matrix. When an X-ray excited the glass, the radioluminescence band appeared at 400nm as in the PL spectrum. This is identified as the transition from the 5d excited state to the 4f ⁷(⁸S_7/2) ground state of Eu²⁺. The scintillation decay time under excitation with the pulsed X-ray was calculated to be about 630 ns. The irradiation dose response of the thermoluminescence (TL) and optically-stimulated luminescence (OSL) intensities was linear in the studied dose range at 0.25-200mGy and 0.25-16 Gy, respectively.