Effect of Ca co-doping on gamma-stimulated luminescence of Lu2SiO5:Ce

In order to estimate the stability of the light output of the scintillation detector, the Lu2SiO5:Ce scintillation crystals, additionally doped with Ca2+ ions at concentrations of 0 ÷ 0.4 at%, were studied. The spectra of optical absorption, gamma-luminescence, thermal luminescence, dose and temperature dependences of luminescence were measured. Gamma-luminescence in the dose range 10 - 5·107 Gy was recorded using 60Co gamma-source at the temperature range of 310–460 K. In contrast to the initial sample (non-doped with Ca), in the sample doped with 0.1 at% of Ca, an increase in the luminescence intensity was observed in the range of 390–425 nm, but further with an increase in the concentration of Ca (0.3–0.4 at%), the intensity of this band decreased to the initial level (undoped). At Ca concentrations of 0.3 and 0.4 at%, the intensity of the Ce1 center band remains practically unchanged up to a dose of 5·107 Gy. LSO crystals doped with Ce 0.1 at% and co-doped with Ca 0.1 at% can be recommended as a scintillation detector up to a gamma-dose of 105 Gy at room temperature. •Ca-codoped Lu2SiO5:Ce crystals are studied as a material for scintillation detector.•At Ca 0.1 at% an increase in the luminescence at 390–425 nm was observed.•At Ca 0.3 at% the Ce1 center emission doesn't change up to a γ-dose of 5·107 Gy.•Defect complexes completely discolor at room temperature in two days.