Engineering of a new single-crystal multi-ionic fast and high-light-yield scintillation material (Gd_0.5–Y_0.5)₃Al₂Ga₃O₁₂:Ce,Mg

Abstract

A single crystal scintillation material (Gd0.5–Y0.5)3Al2Ga3O12 (GYAGG) doped with Ce and codoped with Mg at a small concentration was grown by the Czochralski technique and studied for its scintillation properties for the first time.

Composition-Engineered GSAG Garnet: Single-Crystal Host for Fast Scintillators

“…However, its scintillation decay still contained longer components (τ 2 ≥ 200 ns). Multicomponent garnets of general host composition (Lu,Y,Gd) 3 (Al,Ga) 5 O 12 doped by fast Ce 3+ and Pr 3+ luminescent centers have been studied and reported by a number of laboratories. − One of the two possible strategies to improve the scintillation performance of GAGG is the previously mentioned band gap engineering. , The second strategy consists of codoping with divalent ions (e.g., Ca 2+ or Mg 2+ ), which stabilize the Ce 4+ centers. ,− These centers compete with electron traps in the material for the capture of an electron from the conduction band. As a result, the intensity of slow radiative recombination processes is reduced.…”

“…5−18 One of the two possible strategies to improve the scintillation performance of GAGG is the previously mentioned band gap engineering. 10,12 The second strategy consists of codoping with divalent ions (e.g., Ca 2+ or Mg 2+ ), which stabilize the Ce 4+ centers. 11,18−20 These centers compete with electron traps in the material for the capture of an electron from the conduction band.…”

Compositional engineering of multicomponent garnet scintillators: towards an ultra-accelerated scintillation response

“…A 137 Cs source was used for excitation. The Coincidence Time Resolution (CTR) is defined as the resolution of the difference in detection time of two 511 keV back-to-back gamma photons produced by a 22 Na source. The samples were wrapped in Teflon and coupled to Silicon Photomultipliers (SiPMs) HPK S13360-3050PE.…”

Compositionally Disordered Doped with Cerium Crystalline Garnet Type Materials for Brighter and Faster Scintillations

“…The studied samples of ceramics, according to X-ray luminescence analysis, contained a single garnet phase (PDF [00-046-0448]), and the grain size according to scanning electron microscopy was 5-10 μm. A single crystal sample (Gd,Y) 3 Ga 3 Al 2 O 12 :Ce [13] with a scintillation yield of 50.000 ph/MeV was chosen to be a reference. To mimic translucent ceramic the crystal surface was ground.…”

“…A very positive effect of partial substitution of the Gd ions by Y was confirmed in single crystals grown by the Czochralski method. A GYAGG: Ce single crystal with equal atomic percentages of Y and Gd ions in the composition demonstrates a high light yield of 52.000 ph/MeV and a scintillation decay time of 50 ns [13]. The drawback of the material is a relatively low density of 5.9 g/cm 3 .…”