YAP :Ce

YAP :Ce
Yttrium aluminum perovskite activated by cerium is a fast, mechanically and chemically resistant scintillation material. These scintillators have very low energy secondary X-ray emission, which is of advantage in imaging applications. YAP:Ce detectors are used for gamma and X-ray counting, electron microscopy, electron and X-ray imaging screens. The materials scintillation and mechanical properties enable their use in tomography systems.

Technical parameters

 

 Physical properties
  YAP:Ce YAG:Ce LuAG:Ce CRY 18 LuAG:Pr LuAP:Ce BGO PWO CRY 19
Density  5.37 g/cm3 4.57 g/cm3  6.73 g/cm3  4.5 g/cm3  6.73 g/cm3  8.34 g/cm3  7.13 g/cm3  8.28 g/cm3  7.1 g/cm3
Hardness by Mohs  8.6 8.5  8.5  5.8  8.5  -  5  4  -
Index of refraction  1.95 1.82  1.84  1.79  1.84  -  2.15  2.17  1.81
Melting point  1875°C 1970°C  2020°C  1980°C  2043°C  1960 °C  1050 °C  1123 °C  2100°C
Thermal expansion  0.4-1.1 x 10-5/K 0.8-0.9 x 10-5/K  -  -  -  -  0.7 x 10-5/K  -  1.8-10.3 x 10-5/K
Crystal structure  rhombic cubic  cubic  monoclinic  cubic  -  cubic  tetragonal symetric  monoclinic
Hygroscopic  NO NO  NO  NO  NO  NO  NO  NO  NO
Scintillation properties
Wavelength of max. emission  370 nm 550 nm  535 nm  425 nm  310 nm  365 nm  480 nm  420 nm  420 nm
Decay constant  25 ns 70 ns  70 ns  45 ns  20 ns  18 ns  300 ns  5-15 ns  41 ns
Afterglow  <0.005 % at 6 ms <0.005 % at 6 ms  -  -  -  -  <0.005% at 6 ms  -  -
Radiation length for 511 keV  2.7 cm 3.5 cm  1.3 cm  2.74 cm  1.3 cm  -  1.1 cm  0.89 cm  2.1 cm
Photon yield at 300 K (27°C)  25 x 103 Ph/MeV 30 x 103 Ph/MeV  25 x 103 Ph/MeV  30 x 103 Ph/MeV  15-18 x 103 Ph/MeV  11 x 103 Ph/MeV  8-10 x 103 Ph/MeV  15-25 phe/MeV  24 x 103 Ph/MeV
Integrated light output compared to NaI:Tl  70 % NaI:Tl 40 % NaI:Tl  20 % NaI:Tl  80 % NaI:Tl  66 % NaI:Tl  -  15-20 % NaI:Tl  -  75 % NaI:Tl

 

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