GOS:Pr Scintillator:
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) |
GOS Ceramics, or Gadolinium Oxysulfide ceramics, are primarily composed of the chemical compound Gadolinium Oxysulfide (Gd2O2S), GOS Ceramics belongs to a hexagonal system structure (space group: P3− ml; lattice parameters: a = b = 0.3851 nm and c = 0.6664 nm) with trigonal symmetry.
Gadolinium oxysulfide (GOS) is an excellent scintillation material because of its high density (7.43 g/cm3) and adequate atomic number of Gd. These characteristics lead to an increased interaction potential possibility for X-ray radiation. Solid-state Gd2O2S (GOS) also exhibits promising chemical and physical characteristics, such as high melting point (2070 ◦C), high X-ray attenuation coefficient (~52 cm−1 at 70 keV), wide band gap (4.6–4.8 eV), favorable chemical durability, low phonon energy, low crystal symmetry, and low toxicity, which make it a promising host material for luminescence and scintillation applications.
Terbium-activated gadolinium oxysulfide (GOS: Tb) finds prominence as a scintillator for X-ray imaging. It emits wavelengths between 382nm and 622nm, with the emission peak positioned at 545nm. GOS: Tb sub-micro phosphors synthesized by the homogeneous precipitation method are promising as a new green emitting material to be applied to the high-resolution digital X-ray imaging field. It is also an excellent green phosphor in projection CRTs.
GOS:Pr (Gadolinium Oxysulfide activated with Praseodymium) exhibits unique luminescent properties. The Pr3+-activated GOS ceramic is an effective ceramic scintillation material for high-quality imaging applications owing to its high X-ray conversion efficiency, strong stopping power for the incident X-ray, short lifetime, fast afterglow, high chemical stability, and good emission, matching with the high sensitivity of silicon photodiodes.
Hangzhou Shalom EO offers GOS: Pr and GOS: Tb Scintillation Materials. Our Pr-doped GOS and Tb-doped GOS feature high light output, low afterglow, and environmental friendliness. We have developed an advanced production line with leading-edge capabilities. Besides, we also offer GOS scintillation thin films and GOS pixellated arrays.
1. The X-ray Excited Emission Spectrum of Shalom EO's GOS:Tb
2. The X-ray Excited Emission Spectrum of Shalom EO's GOS:Pr
3. The Afterglow Comparison between Shalom EO's GOS:Pr and Other Commercial GOS Ceramics
4. Other Properties of Shalom EO's Pr Activated 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 |
