GAGG:Ce Scintillation Crystals

1Overview

GAGG:Ce (Gd₃Al₂Ga₃O₁₂:Ce) is a single-crystal garnet scintillator that combines one of the highest densities available in a non-hygroscopic oxide material with a fast primary decay time below 90 ns. At 6.6 g/cm³ and an effective atomic number driven by gadolinium, GAGG:Ce offers excellent stopping power for MeV-range gamma rays. Its green emission peak at 520 nm aligns well with the peak quantum efficiency of silicon photomultipliers (SiPMs), making it the crystal of choice for SiPM-based readout without wavelength-shifting elements.

Unlike hygroscopic materials such as NaI(Tl) or LaBr₃(Ce), GAGG:Ce requires no hermetic sealing. Crystals can be handled in ambient laboratory air and incorporated into detector assemblies with fewer packaging constraints. This robustness, combined with its radiation hardness and lack of self-activity, simplifies integration into field-deployed instruments and compact detector modules.

Choose GAGG:Ce when the application demands high photon detection efficiency, fast coincidence timing, and a non-hygroscopic crystal compatible with compact SiPM-based readout. It is the dominant scintillator in commercial TOF-PET scanners and is widely used in small-animal preclinical imaging and in HEP calorimeter prototype work where moderate energy resolution is acceptable.

2Specifications

Note: Specifications are taken verbatim from the source datasheet. Parameters marked "verify" are not confirmed in the source document and require factory confirmation before use in system design.

3Energy Resolution and Performance

The energy resolution of approximately 6.0% FWHM at 662 keV (measured with high quantum efficiency PMTs) places GAGG:Ce in the middle tier of inorganic scintillators: significantly better than BGO (roughly 9-12%) and competitive with CsI(Tl), but below the top-tier spectroscopy materials such as LaBr₃(Ce) or SrI₂(Eu). For PET applications, where coincidence timing resolution and stopping power matter more than absolute spectral resolution, GAGG:Ce is an excellent fit.

The sub-90 ns primary decay time enables good coincidence timing performance in time-of-flight PET (TOF-PET) configurations. GAGG:Ce does not carry the intrinsic radioactivity background of lanthanum-bearing crystals (no La-138 self-activity), which is an advantage in low-count-rate environments and in calibration measurements.

Relative light yield of 35-40% versus NaI(Tl) at 100% is lower than some competing crystals. In SiPM readout applications, however, GAGG:Ce's 520 nm emission matches SiPM peak sensitivity closely, partially recovering photoelectron yield compared to PMT readout. System-level performance should be evaluated with the intended photodetector.

4Typical Applications

• PET imaging (clinical and preclinical): High density and fast decay make GAGG:Ce the primary alternative to LYSO in time-of-flight PET scanner development. Non-hygroscopic construction simplifies detector module assembly.
• High-energy physics (HEP) calorimetry: Stopping power and radiation hardness support use in electromagnetic and hadron calorimeter prototype arrays.
• SiPM-based compact detectors: Emission at 520 nm matches SiPM peak quantum efficiency, enabling low-bias, high-performance readout without wavelength-shifting. Suitable for portable and handheld radiation instruments.
• Nuclear medicine and SPECT: Gamma-camera and coincidence detector modules for single-photon emission imaging.
• Industrial gauging and process control: Rugged, non-hygroscopic construction tolerates harsh environments. High stopping power reduces crystal volume for a given detection efficiency.
• Security and portal monitoring: Fast decay and moderate energy resolution support gamma identification in cargo and personnel screening systems.
• Physics research: Prompt gamma-ray detection, neutron-capture gamma spectroscopy, and time-coincidence experiments where sub-100 ns timing is required alongside reasonable spectral resolution.

5Available Configurations

Berkeley Nucleonics ScintIQ crystals are supplied as bare polished crystals, diffuse-wrapped crystals, or integrated detector assemblies depending on the application. Standard and custom shapes, dimensions, and surface finishes are available. Contact BNC with your geometry and readout requirements for a configuration recommendation.

Specific dimensions, surface treatments, and housing designs for GAGG:Ce are confirmed at order time. Items marked "verify" require factory confirmation. Contact BNC Engineering for custom sizing and array configurations.

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