Abstract
Five apatite crystal scintillators, which have chemical compositions of Ce 0.5%: Gd9.33(SiO4)6O2, Ce 0.5%:(Gd8Sr2)(SiO4)6O2, Ce 5%:(Gd8Sr2)(SiO4)6O2, Yb 0.5%:(Gd8Sr2)(SiO4)6O2 and Yb 3%:(Gd8Sr2)(SiO4)6O 2 were grown by the micro-pulling down method. After cut and polishing processes, optical and radiation properties were evaluated. In a transmittance measurement, Ce doped crystals showed an absorption feature at approximately 300 nm and Yb doped ones 220 nm, respectively. When Ce-doped ones were excited by 340 nm photons, the emission peak appeared at approximately 400 and 440 nm, due to Ce3+ 5d-4f transitions. In Yb-doped series, 270 nm excitation caused emission peaking around 300 nm. The photoluminescence decay time kinetics of Ce-doped series were investigated. The Ce 0.5% doped (Gd 8Sr2)(SiO4)6O2 showed about 23 ns decay constants, and the 5% doped one showed 14 ns. When coupled with Si-APD and irradiated by 241Am α-ray, Ce doped scintillators showed 300-500 photons/5.5 MeV α as a light yield.
Original language | English |
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Article number | 5485085 |
Pages (from-to) | 1308-1311 |
Number of pages | 4 |
Journal | IEEE Transactions on Nuclear Science |
Volume | 57 |
Issue number | 3 PART 2 |
DOIs | |
Publication status | Published - 2010 Jun 1 |
Keywords
- Cerium
- Radiation detectors
- Scintillation detectors
- Ytterbium
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering
- Electrical and Electronic Engineering