Basic Properties:
| Density(g/cm3) | 7.280 | Refractive Index | 2.2 |
| Molecular Formula | Gd2O2S | Relative Molecular Mass | 378 |
| Melting Point | 2070°C | Crystal Structure | Hexagonal Crystal System |
| Zeff | 61.1 |
X-ray Photoelectric Properties of GOS:Pr Scintillator Array:
| Light Output | 27000 ph/MeV | Peak Wavelength | 512nm |
| Decay Time | 3μs | Afterglow | <0.1%@3ms, ≤0.01%@100ms |
| Light Output Fluctuation of Different Pixel | ≦5% | Light Output Fluctuation of Different Arrays | ≦10% |
| Crosstalk (Gap0.085) | ≦8% | Irradiation Damage of GOS Ceramic Array | 20% of 1 Mrad |
Specifications of GOS:Pr Scintillator Array:
| Dimensional Precision | <0.03mm@42x48mm | Flatness | <0.03mm@42x48mm |
| Pixel Size Consistency | ±0.01mm | Reflection Gap Size | 0.065-0.1mm |
Comparison of GOS Ceramic Scintillators with CsI(Tl) Scintillators
| Material | CsI(Tl) | GOS:Tb | GOS:Pr |
| Peak Wavelength | 560 | 550 | 510 |
| Morphology | Cubic | Poly-crystalline Ceramic | Poly-crystalline Ceramic |
| Transparency | Transparent | Translucent | Translucent |
| Light Output/MeV | 59000 | 46500 | 27000 |
| Decay Time/ns | 1 | 600 | 3 |
| Afterglow/@3ms | ≤1% | ≤0.1% | ≤0.05% |
| Atomic Coefficient | 54 | 60 | 60 |
| Density/g-cm3 | 4.51 | 7.34 | 7.34 |
| Hygroscopicity | Slightly | No | No |
| Irradiation Damage | / | 12%(1Mrad) | 6%(1Mrad) |
Pr activated gadolinium oxysulfide, or GOS (Gd2O2S: Pr), is a ceramic scintillation material with a hexagonal crystal structure. GOS:Pr crystal has good chemical stability, and excellent machinability, and is harmless to the environment. GOS doped with rare earth ion features a high light output and a moderate level of afterglow (less than 0.1% at 3 ms). The emission peak wavelength of GOS scintillator ceramics is located at 512nm, which matches well with the spectral sensitivity of silicon photodiodes (Si PD).
Hangzhou Shalom EO offers GOS scintillator arrays with linear or two-dimensional designs. Our GOS scintillation arrays find widespread usage in Computerized Tomography (CT) scanners, security devices, and non-destructive testing systems. Besides, Shalom EO also offers GOS scintillation arrays coupled with silicon photodiodes.
1. The X-ray Excited Emission Spectrum of Shalom EO's GOS:Pr
2. The Afterglow Comparison between Shalom EO's GOS:Pr and Other Commercial GOS Ceramics
Luminescence Decay Time of GOS Ceramics:
| Comparison Sample | Reference GOS1 | Reference GOS2 | Shalom EO's GOS1 | Shalom EO's GOS2 |
| Decay Time/μs | 3.101 | 3.144 | 3.317 | 3.286 |
