Single crystals of LuAG:Ce co-doped with Ca2+ were grown by the vertical Bridgman method and studied for optical properties, γ-irradiation induced absorption, scintillation light yield and decay. It is shown that addition of Ca2+ may efficiently limit the radiation induced absorption associated with presence of trace amounts of Yb. In bulk crystals with balanced Ca2+/Ce concentration the absorption induced in the emission range around 520 nm is less than 1 m-1, after the dose 1 kGy and 860 Gy/h dose rate. The light yield of LuAG:Ce upon co-doping with Ca2+ is preserved, while the fraction of the delayed recombination leading to slow scintillation components is decreased. The effects of Ca2+ were not favorable in Pr-doped LuAG studied so far. The absorption induced in the emission range around 300-400 nm range in the Ca-free LuAG:Pr, after the irradiation dose 1 kGy, is about 35 m-1, while it is above 100 m-1 in the Ca co-doped LuAG:Pr.
Petrosyan, A., Ovanesyan, K., Derdzyan, M., Ghambaryan, I., Patton, G., Moretti, F., et al. (2015). A study of radiation effects on LuAG:Ce(Pr) co-activated with Ca. JOURNAL OF CRYSTAL GROWTH, 430(15 November 2015), 46-51 [10.1016/j.jcrysgro.2015.08.019].
A study of radiation effects on LuAG:Ce(Pr) co-activated with Ca
Lucchini M;
2015
Abstract
Single crystals of LuAG:Ce co-doped with Ca2+ were grown by the vertical Bridgman method and studied for optical properties, γ-irradiation induced absorption, scintillation light yield and decay. It is shown that addition of Ca2+ may efficiently limit the radiation induced absorption associated with presence of trace amounts of Yb. In bulk crystals with balanced Ca2+/Ce concentration the absorption induced in the emission range around 520 nm is less than 1 m-1, after the dose 1 kGy and 860 Gy/h dose rate. The light yield of LuAG:Ce upon co-doping with Ca2+ is preserved, while the fraction of the delayed recombination leading to slow scintillation components is decreased. The effects of Ca2+ were not favorable in Pr-doped LuAG studied so far. The absorption induced in the emission range around 300-400 nm range in the Ca-free LuAG:Pr, after the irradiation dose 1 kGy, is about 35 m-1, while it is above 100 m-1 in the Ca co-doped LuAG:Pr.
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