Phase-Separated CsI-NaCl Scintillator With Optical Guiding Function

a b s t r a c tCe doped SrHfO 3 /SrAl 12 O 19 eutectics were grown by the micro pulling down (l-PD) method and their directionally solidified eutectic system has been investigated. Investigations of obtained eutectic structure, luminescence and scintillation performances were also performed. Eutectics were grown at the speed of 0.60-0.90 mm/min. In the eutectics, Ce 3+ 4f-5d emission was observed at 410 nm. The eutectics showed light yield of around 300 photon/5.5 meV alpha-ray by 241 Am excitation. Scintillation decay time was 26.4 ns (45%) with slower decay component of 263 ns (55%).

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“…1, so that high-resolution radiation imaging can be achieved. CsI/NaCl [7] and Ce:GdAlO 3 (GAP)/Al 2 O 3 [8] have been already reported as PSSFs.…”

Section: Introductionmentioning

confidence: 99%

Luminescence and scintillation properties of Ce dope SrHfO3 based eutectics

et al. 2015

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“…[18][19][20] Two types of PSSs can be obtained, owing to the refractive index ratio (n m /n c ) of the cylinders (n c ) and the matrix (n m ): matrix-guided PSSs (n m /n c > 1) and cylinderguided PSSs (n m /n c < 1). Particularly, in matrix-guided PSSs, the light-guiding efficiency increases with the refractive index ratio (n m /n c ) and the cylinder volume fraction.…”

Section: X-ray Imaging Resultsmentioning

confidence: 99%

“…The light-guiding efficiency is defined as the ratio of the number of photons detected on the back surface just below the X-ray exposed area to the total number of emitted photons. 19 In previous PSSs, the refractive index ratio was limited to low values because it was difficult to remove the cylinder phases selectively. In the CuI-based eutectic systems, the dependence of the light-guiding efficiency on the refractive index ratio (n m /n c ) or the cylinder volume fraction was obtained experimentally from as-prepared eutectic crystals and porous CuI crystals (Table I).…”

Section: X-ray Imaging Resultsmentioning

confidence: 99%

High-refractive-index CuI waveguide with aligned cylindrical micropores for high-resolution X-ray imaging

Ōhashi

Yasui

Den

2014

Journal of Applied Physics

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We have fabricated porous CuI crystals and used them as scintillator plates for high-resolution X-ray imaging by combining the properties of high-refractive-index light waveguide and scintillation. Porous CuI crystals containing aligned cylindrical micropores with pore volumes of 6% and 30% were fabricated by leaching directionally solidified CuI/NaCl and CuI/KCl eutectic crystals. The continuous cylindrical pores, which had a smooth surface, extended inward from the front to the back surface of the CuI crystal; therefore, light is confined in the CuI matrix with high refractive index (n ≈ 2.35) and transported along the pore direction by a total reflection mode. High-resolution X-ray imaging was demonstrated by using a 30% pore volume CuI crystal for an X-ray resolution chart and the 10 lp/mm pattern was clearly resolved.

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“…Halide and oxide eutectic materials composed of scintillators with rod-like microstructure and a surrounding matrix with higher refractive index such as CsI-NaCl:Tl þ [7,8] and α-Al 2 O 3 -GdAlO 3 :Ce 3 þ [9] have been developed for X-ray imaging,. Their excellent contrast transfer function (CTF) values indicate the scintillation light was transported to the surface of the eutectic scintillators with total reflection at the interface between scintillator and the matrix, and almost reached the theoretical resolution limit of the material itself.…”

Section: Introductionmentioning

confidence: 99%