Optical and scintillation properties of Lumilass-G and -R glasses

Abstract

Commercial phosphor glasses, namely, Lumilas-G9 and -R7 were investigated on their optical and scintillation characteristics. In transmittance, close to 90% transmission was achieved in both glasses at visible wavelength, and some specific absorption lines due to 4f-4f transitions of Tb3+ and Eu3+ were detected in Lumilass-G9 and -R7, respectively. In photoluminescence and scintillation, several sharp emission lines were observed in both glasses, and the emission origins of them were attributed to 4f-4f transitions of Tb3+ and Eu3+. Under pulse X-ray irradiation, the scintillation decay time of both Lumilas-G9 and -R7 resulted in 1.3 ms. To determine the scintillation light yield, α-rays from 241Am were irradiated to these samples, and the light yields of Lumilas-G9 and -R7 estimated by pulse area measurements turned out to be 700 and 1800 ph MeV−1, respectively.