Scintillation Characteristics of Mg²⁺-Codoped Y0.8Gd2.2(Al₅–ₓGaₓ)O12:Ce Single Crystals

Scintillation characteristics of Y
_0.8
Gd
_2.2
(Al
_5-x
Ga
_x
)O12:Ce,Mg (x = 2.6 and 3) single crystals are presented. At 662-keV y-rays, the light yield of 35 600 photons/MeV obtained for Y
_0.8
Gd
_2.2
Al
₂
Ga
₃
O
₁₂
:Ce,Mg is higher than that of 32 600 photons/MeV for Y
_0.8
Gd
_2.2
Al
_2.4
Ga
_2.6
O
₁₂
:Ce,Mg. Scintillation decay components of 32.3 ns (52.4%) + 10
⁴
ns (47.6%) obtained for Y
_0.8
Gd
_2.2
Al
₂
Ga
₃
O
₁₂
:Ce,Mg are faster than those of 11.5 ns (5%) + 51.2 ns (69%) + 302 ns (26%) obtained for Y
_0.8
Gd
_2.2
Al
_2.4
Ga
_2.6
O
₁₂
:Ce,Mg. The coincidence time resolution of 336 and 389 ps was obtained, respectively, for Y
_0.8
Gd
_2.2
Al
₂
Ga
₃
O
₁₂
:Ce,Mg-photomultiplier (PMT) and Y
_0.8
Gd
_2.2
Al
_2.4
Ga
_2.6
O
₁₂
:Ce,Mg-PMT, in coincidence experiment with a BaF2-PMT detector. The radioluminescence yield at room temperature (RT) is comparable for both crystals while the yield below 130 K is about 20% higher for Y
_0.8
Gd
_2.2
Al
₂
Ga
₃
O
₁₂
:Ce,Mg. Afterglow and thermally stimulated luminescence (TSL) below RT are also measured.