Radiation hardness of LuAG:Ce and LuAG:Pr scintillator crystals

A study of radiation effects on LuAG:Ce(Pr) co-activated with Ca

“…Absorption induced in LuAG:Pr in the range of Pr 3 þ emission (at 300-400 nm) is much stronger than that in LuAG:Ce (at 520 nm) [10]. Fig.…”

“…[10]; after 1 kGy, the induced absorption in LuAG:Ce (at emission wavelength 535 nm) was 2 m À 1 , while in LuAG:Pr it was about 100 m À 1 (at emission wavelength 320 nm). It has been shown [10] that the damage of transmission is mainly due to appearance of absorption bands peaking at 375 nm and 600 nm; the origin of these bands was assigned to trace amounts of Yb coming from raw oxides based on line locations, profiles and shifts with composition and supported by comparisons with crystals containing intentionally added Yb in the ppm level range. Ytterbium enters the lattice in the trivalent state substituting Lu 3 þ but, due to high electron affinity, it can easily acquire the 2 þ valence state giving rise to absorptions at 375 nm and 600 nm (see Ref.…”

“…The absorption induced by γ-irradiation (with doses up to 10 5 Gy) in Bridgman LuAG:Ce and LuAG:Pr was studied in Ref. [10]; after 1 kGy, the induced absorption in LuAG:Ce (at emission wavelength 535 nm) was 2 m À 1 , while in LuAG:Pr it was about 100 m À 1 (at emission wavelength 320 nm). It has been shown [10] that the damage of transmission is mainly due to appearance of absorption bands peaking at 375 nm and 600 nm; the origin of these bands was assigned to trace amounts of Yb coming from raw oxides based on line locations, profiles and shifts with composition and supported by comparisons with crystals containing intentionally added Yb in the ppm level range.…”

Ionizing radiation induced emission: Scintillation and storage-type luminescence

“…To my experience, radiation-weak materials show high OSL and TSL intensity. Recently, radiation tolerance of Pr-doped LuAG was investigated and this material was relatively weak to high dose radiation exposure [19,20]. Though TSL and OSL are qualitative evaluations, OSL and TSL intensities of Pr-doped LuAG were higher than other famous scintillators at least in my experience.…”

Energy migration processes in undoped and Ce-doped multicomponent garnet single crystal scintillators

“…The latest studies of Ce 3+ [16], prepared by micro-pulling-down and Czochralski techniques, respectively. Several groups [17][18][19][20][21][22][23][24] studied scintillation characteristic of LuAG:Pr and found them very promising due to favorable combination of fast scintillation decay dominated by 20 nanosecond component and light yield approaching 20 000 phot/MeV with energy resolution 4.6%@662 keV. Moreover, its scintillation parameters do not deteriorate significantly up to 300 o C [25].…”