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Abstract
Optical-luminescence properties, including absorption spectra, photoluminescence excitation spectra, and changes in photoluminescence spectra after irradiation with $\gamma$-rays in the dose range of 1–3 Gy, were measured for novel ${{\rm LiB}_3}{{\rm O}_5}\!:\!{\rm Ag}$ dosimeter glass. A clear dependence of the intensity of the photoluminescence (PL), with a maximum of approximately 300 nm, on the dose value when excited by light with ${\lambda _{{\rm exc}}} = {220}\;{\rm nm}$ was observed. The mechanism of PL in $\gamma$-irradiated ${{\rm LiB}_3}{{\rm O}_5}\!:\!{\rm Ag}$ glass is proposed to be a consequence of radiation annihilation with the emission of relaxed exciton-like electronic excitations with the participation of impurity defects (${{\rm Ag}^0}$) in the glass structure. Considering that ${{\rm LiB}_3}{{\rm O}_5}$ has an effective atomic number of ${{Z}_{{\rm eff}}} = {7.39}$, which is the closest to ${{Z}_{{\rm eff}}} = {7.42}$ of human body tissue, ${{\rm LiB}_3}{{\rm O}_5}\!:\!{\rm Ag}$ glass can be very promising for $\gamma$-dosimetry in medical practice during radiation therapy of patients with cancer. The presence of lithium Li(6) and boron B(10) isotopes increases the sensitivity of ${{\rm LiB}_3}{{\rm O}_5}\!:\!{\rm Ag}$ glass to neutrons, which is promising for the manufacture of individual neutron dosimeters for applications in a new field of radiation therapy–neutron therapy.
© 2024 Optica Publishing Group
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