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Cerium-doped single crystal and transparent ceramic lutetium aluminum garnet scintillators

✍ Scribed by Nerine J. Cherepy; Joshua D. Kuntz; Thomas M. Tillotson; Derrick T. Speaks; Stephen A. Payne; B.H.T. Chai; Yetta Porter-Chapman; Stephen E. Derenzo

Publisher: Elsevier Science
Year: 2007
Tongue: English
Weight: 322 KB
Volume: 579
Category: Article
ISSN: 0168-9002
DOI: 10.1016/j.nima.2007.04.009

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✦ Synopsis

For rapid, unambiguous isotope identification, scintillator detectors providing high-resolution gamma ray spectra are required. We have fabricated Lutetium Aluminum Garnet (LuAG) using transparent ceramic processing, and report a 2-mm thick ceramic exhibiting 75% transmission and light yield comparable to single-crystal LuAG:Ce. The LuAG:Ce luminescence peaks at 550 nm, providing an excellent match for Silicon Photodiode readout. LuAG is dense (6.67 g/cm 3 ) and impervious to water, exhibits good proportionality and a fast decay ($40 ns), and we measure light yields in excess of 20,000 photons/MeV.

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## Abstract Shaped single crystals of Bi:Gd~3~Ga~5~O~12~ (Bi = 0.102, 0.126 and 0.141 mol.%) and Bi:Y~3~Ga~5~O~12~ (Bi = 0.041, 0.047 and 0.061 mol.%) were grown by the micro‐pulling‐down method. Measured optical absorption spectra show an absorption band round 290 nm ascribed to the lowest energy