GOS (Gd2O2S, gadolinium oxysulfide) has excellent characteristics such as high light output, high density, short afterglow, etc., and is widely used in medical CT and security CT detectors. GOS is a hexagonal crystal with a wide bandgap structure (4.4~4.8eV), high chemical stability, and is used as a scintillator matrix material. Gd2O2S: Pr, Ce ceramic scintillator has high conversion efficiency for X-rays, and its decay time (t1/10 = 5.5 us) is short, which can realize repeated imaging in a short time. It can be used not only in medical imaging equipment but also in color television picture tubes.


Parameter

Material Features

PropertyValue
MaterialsGe2O2S
Density (g/cm3)7.34
Crystal structureHexagonal
Lattice parametersa = b = 3.85827Å,
c = 6.666659 Å
HygroscopicityNo
Cleavage planeNo
Solubility (g/100gH2O)N/A

Scintillator Properties

PropertyValue
Wavelength(Max. emission) (nm)510
Wavelength range (nm) 400-2000
Decay time5.5
Wide-Gap (eV)4.6-4.8
Luminescence intensity (keV)27.5
X-ray attenuation coefficient (cm-1)52 at 70   keV
0.80 at 500 keV
Relative light output (%)80
Afterglow (%)< 0.01
Radiation damage (%) -3

Spertrum

GOS Emission Spectrum
GOS Transmission Spectrum

Feature

  • High luminous efficiency
  • Low afterglow
  • High light output
  • High X-ray absorption efficiency

Application

  • X-ray CT
  • X-ray microscope
  • Laser material

Reference

[1]  Ito Y ,  Yamada H ,  Yoshida M , et al. Hot Isostatic Pressed Gd2O2S:Pr, Ce, F Translucent Scintillator Ceramics for X-Ray Computed Tomography Detectors[J]. Japanese Journal of Applied Physics, 1988, 27(8):L1371-L1373.
[2]  Nakamura R . Improvements in the X‐ray Characteristics of Gd2O2S:Pr Ceramic Scintillators[J]. Journal of the American Ceramic Society, 2010, 82(9):2407-2410.
[3] Wei, Wang, Yongsheng, et al. Gd2O2S: Pr Scintillation Ceramics from Powder Synthesized by a Novel Carbothermal Reduction Method[J]. Journal of the American Ceramic Society, 2015.

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