Scintillation response of Lu1.95Y0.05SiO5:Ce and Y2SiO5:Ce single crystal scintillators

The crystal growth of ortho- and pyrosilicates from W and Mo crucibles

“…The energy resolution at 662 keV energy was 13.9 % for YSO:Ce and 17.3 % for La-GPS. The demonstrated scintillation parameters are worse than the best values obtained with crystals grown in Ir crucibles: up to 26700 phot/MeV and 6.8% in YSO:Ce [3] and 39000 phot/MeV and 5.4 % in La-GPS [6]. Obviously such results are called by the presence of scattering centres and point defects, which nature should be determined in further work.…”

“…In the crystallized melt the gas bubbles were partially covered with metallic tungsten. Additinally, tungsten dendrite branches and inclusions were observed at crystal surfaces (Figure 1c,d SiO 2(l) + CO (g)  SiO (g) + CO 2(g) (3).…”

“…The characteristic Ce 3+ violet phosphorescence was observed under UV light (Figure 5c). The measured crystal density was 5.274 g/cm 3 . It is comparable with the density of 5.5 g/cm 3 in La 0.2 -Ce 0.05 Gd 1.75 Si 2 O 7 [29] (but note the lower La concentration leading to the density increase in our case).…”

“…Crystals of rare-earth silicate complex oxides are widely used in scintillator and laser applications. Ce-doped orthosilicates Lu 2 SiO 5 (LSO:Ce), Lu 1-x Y x SiO 5 (LYSO:Ce), Y 2 SiO 5 (YSO), Gd 2 SiO 5 (GSO) Lu 1-x Gd x SiO 5 (LGSO:Ce) are very popular scintillation materials with the density of up to 7.4 g/cm 3 , high light yield up to 38000 phot/MeV, a good energy resolution (7 -9% at the 662 keV energy), and short luminescence decay time of 35 -80 ns [1][2][3]. The main areas of orthosilicates application are medical PET tomographs [4] and high energy physics experiments [5].…”

Recent advances in rare earth scintillation crystals

“…BGO [34] 7. 1 74 d I 3 4 8600 480 300 9 GSO:Ce [34,74] 6.7 59 P2 1 /c 12500 420 60 7.8 Y 2 SiO 5 :Ce (YSO:Ce) [74,75] 4.54 39 C2/c 15300 420 52 9.3 LSO:Ce [34,74] 7.4 66 C2/c 26000 390 35 7.9 LYSO:Ce [74,76] 7.11 63.5 C2/c 37400±3700 420 ~38 7.7 LYSO:Ce, Ca [31,75] 7.2 63.5 C2/c 30000~32000 400 30~35 8~9 (Lu x Gd 1x ) 2 SiO 5 (LGSO):Ce [77,78] ~7. [81,82] 4.04 33 P2 1 /m 5800 360 30 -La-GPS:Ce [79] 5.4~5.7 --36000 390 46 5 图 11 (网络版彩图)LSO 晶体结构示意图 继被开发 [84,85] , 其中 LSO 具有更大的有效原子序数、 更高的密度、较高的光输出(26000 ph MeV 1 )、较短 的衰减时间(35 ns)、较高的能量分辨率(7.9%@662 keV), 因此成为医疗成像 PET 的新宠.…”