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4 September 2015 Transparent ceramic scintillators for gamma spectroscopy and MeV imaging
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We report on the development of two new mechanically rugged, high light yield transparent ceramic scintillators: (1) Ce-doped Gd-garnet for gamma spectroscopy, and (2) Eu-doped Gd-Lu-bixbyite for radiography. GYGAG(Ce) garnet transparent ceramics offer ρ = 5.8g/cm3, Zeff = 48, principal decay of <100 ns, and light yield of 50,000 Ph/MeV. Gdgarnet ceramic scintillators offer the best energy resolution of any oxide scintillator, as good as R(662 keV) = 3% (Si-PD readout) for small sizes and typically R(662 keV) < 5% for cubic inch sizes. For radiography, the bixbyite transparent ceramic scintillator, (Gd,Lu,Eu)2O3, or “GLO,” offers excellent x-ray stopping, with ρ = 9.1 g/cm3 and Zeff = 68. Several 10” diameter by 0.1” thickness GLO scintillators have been fabricated. GLO outperforms scintillator glass for high energy radiography, due to higher light yield (55,000 Ph/MeV) and better stopping, while providing spatial resolution of >8 lp/mm.
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N. J. Cherepy, Z. M. Seeley, S. A. Payne, E. L. Swanberg, P. R. Beck, D. J. Schneberk, G. Stone, R. Perry, B. Wihl, S. E. Fisher, S. L. Hunter, P. A. Thelin, R. R. Thompson, N. M. Harvey, T. Stefanik, and J. Kindem "Transparent ceramic scintillators for gamma spectroscopy and MeV imaging", Proc. SPIE 9593, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII, 95930P (4 September 2015);

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