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High light yield (~46,000 photons/MeV) enabling superior energy resolution in scintillation detection.
Non-hygroscopic nature eliminates need for hermetic packaging during handling and integration.
Excellent radiation hardness with minimal degradation after prolonged exposure to gamma and neutron fluxes.
Fast decay time (~90–100 ns) supports high-count-rate applications in time-of-flight PET and homeland security systems.
Chemically stable Gd₃Al₂Ga₃O₁₂ composition ensures long-term performance consistency under thermal cycling.
Positron Emission Tomography (PET) detector modules for preclinical and clinical imaging systems.
Gamma-ray spectroscopy in nuclear safeguards, environmental monitoring, and radioactive waste characterization.
Neutron-gamma discrimination in mixed-field radiation detection for border security and nuclear facility instrumentation.
Compact radiation monitoring devices for space-based payloads and satellite-borne dosimeters.
Time-of-flight mass spectrometry (TOF-MS) ion detectors requiring fast, low-afterglow scintillation response.
| Chemical Type | Gd₃Al₂Ga₃O₁₂ (Gadolinium Aluminum Gallium Garnet) |
| Product Form | Polished pixelated crystal array (e.g., 8×8 or 12×12 elements), optionally with reflective coating and optical coupling interface |
| Appearance | Transparent, pale yellow to colorless single crystals; surface finish: λ/10 polished on entrance face |
| Density | 6.63 g/cm³ |
| Primary Applications | Scintillation detection in medical imaging, nuclear physics, and radiation safety instrumentation |
| Key Features | No intrinsic radioactivity (no ¹⁵²Gd or ¹⁵⁵Gd activation concerns), no Ce doping required for baseline performance |
| Benefits | Eliminates cryogenic cooling needs; compatible with SiPM and PMT readout; scalable manufacturing via Czochralski growth |
| Regulatory Compliance | RoHS-compliant; REACH SVHC-free; non-RCRA hazardous per EPA guidelines |
| Common Compatible Systems | Suitability |
| Hamamatsu S13370/S14160 series SiPM arrays | Highly Recommended – Optimized spectral match (peak emission ~520 nm) and compact footprint alignment |
| ET Enterprises 9312BBA photomultiplier tubes | Recommended – Requires quartz window and optimized light guide; validated for full-array coupling |
| CAEN DT5730 digitizer + V1724 FADC platform | Recommended – Supports 100+ channel readout with <100 ps timing jitter using standard firmware |
| GE Discovery MI PET/CT front-end electronics | Suitable – Requires minor gain calibration adjustment; interoperable with existing GAGG firmware libraries |
Q1: What is the CAS Registry Number for GAGG crystal material?
A: GAGG (Gd₃Al₂Ga₃O₁₂) does not have a unique CAS number as it is a crystalline mixed-metal oxide without a defined molecular entity; however, its constituent oxides are listed separately (e.g., Gd₂O₃: 12064-62-9, Al₂O₃: 1344-28-1, Ga₂O₃: 12064-03-8).
Q2: Is GAGG subject to leaching or elemental migration when exposed to aqueous or humid environments?
A: No significant leaching occurs under ambient humidity or brief water contact due to its non-hygroscopic, highly stable garnet lattice; long-term immersion in deionized water at >60°C is not recommended without protective coating.
Q3: How does GAGG compare to LYSO in terms of afterglow and timing resolution?
A: GAGG exhibits <0.001% afterglow at 6 ms (vs. ~0.01% for LYSO) and comparable coincidence timing resolution (~210 ps FWHM with SiPMs), making it preferable for high-duty-cycle TOF-PET where afterglow-induced pile-up is critical.
Q4: Does GAGG crystal array require special export licensing or ITAR controls?
A: Standard GAGG arrays (non-military-grade, <10 cm length, no integrated electronics) are EAR99 and not subject to ITAR; however, arrays configured for neutron detection or integrated with classified signal processing may require BIS review prior to export.
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