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You are here: Home / Scintillator Products / GOS

GOS

Ceramic scintillators based on the composition Gd2O2S: Pr: Ce have high efficiency in converting X- rays into light rays,  a decay time (t1/10 = 5.5 us) short enough to permit repeated imaging with an interval of 1 ms, low phosphorescence, and high radiation stability. Because of the combination of these properties, they have become widely used in medical computerized tomography. Gadolinium oxysulfide (Gd2O2S) is also to produce phosphors and scintillation ceramics for color television picture tubes, medical imaging equipment, and up conversion luminescence, due to its wide-gap (4.6– 4.8eV), high chemical stability and high density. The present GOS scintillation ceramics are very promising as scintillator materials for X-ray CT detector applications.

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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 SpectrumGOS Transmission Spectrum
Feature
Application
Reference
News
Feature
  • High luminescence efficiency
  • Low afterglow
  • High light output
  • High X-ray absorption efficiency
Application
  • X-ray CT
  • X-ray microscope
  • Laser materials
Reference
[1] Greskovich, C, Duclos, et al. CERAMIC SCINTILLATORS.[J]. Annual Review of Materials Science, 1997, 27(1):69-69.
[2]  Lian J ,  Sun X ,  Li J G , et al. Characterization and optical properties of (Gd1x, Prx)2O2S nano-phosphors synthesized using a novel co-precipitation method[J]. Materials Chemistry & Physics, 2010, 122(2-3):354-361.
[3]  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.
[4]  Lian J ,  Sun X ,  Li J G , et al. Synthesis, characterization and photoluminescence properties of (Gd0.99,Pr0.01)2O2S sub-microphosphor by homogeneous precipitation method[J]. Optical Materials, 2011, 33(4):596-600.
[5]  Rossner W ,  Grabmaier B C . Phosphors for X-ray detectors in computed tomography[J]. Journal of Luminescence, 1991, s 48–49(part-P1):29-36.
[6]  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.
[7]  Yamada H ,  Susuki A , Uchida, et al. A scintillator Gd sub 2 O sub 2 S:Pr, Ce, F for x-ray computed tomography. Journal of the Electrochemical Society, 1989.
[8]  Lei B ,  Liu Y ,  Zhang J , et al. Persistent luminescence in rare earth ion-doped gadolinium oxysulfide phosphors[J]. Journal of Alloys & Compounds, 2010, 495(1):247-253.
[9] R Martín-Rodríguez,  Fischer S ,  Ivaturi A , et al. Highly Efficient IR to NIR Upconversion in Gd2O2S: Er3+ for Photovoltaic Applications[J]. Chemistry of Materials, 2013, 25(9):1912-1921.
[10]  Gorokhova E I ,  Demidenko V A ,  Eron’Ko S B , et al. Spectrokinetic characteristics of Gd2O2S:Pr, Ce ceramics[J]. Journal of Optical Technology C/c of Opticheskii Zhurnal, 2006, 73(2):130-137.
[11]  Michail C . Image Quality Assessment of a CMOS/Gd2O2S:Pr,Ce,F X-Ray Sensor[J]. Journal of Sensors, 2015, 637(1):012018.
[12]  David S ,  Georgiou M ,  Loudos G , et al. Evaluation of powder/granular Gd2O2S:Pr scintillator screens in single photon counting mode under 140 keV excitation[J]. Journal of Instrumentation, 2013, 8(1):P01006.
[13]  Mainprize J G ,  Yaffe M J . The effect of phosphor persistence on image quality in digital x-ray scanning systems[J]. Medical Physics, 1998, 25(12):2440-2454.
[14] 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.
[15]  Bolyasnikova L S ,  Demidenko V A ,  Eron’Ko S B , et al. Gd2O2S:Pr:Ce optical scintillation ceramics and their properties[J]. Journal of Optical Technology C/c of Opticheskii Zhurnal, 2006, 73(2):138-142.
[16]  Gorokhova E I ,  Rodnyi P A ,  Anan’Eva G V , et al. Scintillation optical ceramics based on Gd2O2S doped with Pr, Tb, or Eu[J]. Journal of Optical Technology C/c of Opticheskii Zhurnal, 2012, 79(1):41-45.
[17]  Michail C ,  Valais I ,  Seferis I , et al. Measurement of the luminescence properties of Gd2O2S:Pr,Ce,F powder scintillators under X-ray radiation[J]. Radiation Measurements, 2014, 70:59-64.
[18]  Wei W ,  Hk A ,  Sl A , et al. Optical and scintillation properties of Gd2O2S: Pr, Ce, F ceramics fabricated by spark plasma sintering – ScienceDirect[J]. Ceramics International, 2015, 41( 2):2576-2581.
[19] Wang, Wei, Li, et al. Comparison of the optical and scintillation properties of Gd2O2S: Pr, Ce ceramics fabricated by hot pressing and pressureless sintering[J]. Optical materials, 2015.
[20]  Song Y ,  Huang Y ,  Zhang L , et al. Gd2O2S:Yb,Er submicrospheres with multicolor upconversion fluorescence[J]. RSC Advances, 2012, 2.
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