Scintillation response of Lu 3Al 5O 12: Pr 3+ single crystal scintillators
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Author list: Sreebunpeng K., Chewpraditkul W., Nikl M., Mares J.A., Nejezchleb K., Phunpueok A., Wanarak C.
Publisher: Elsevier
Publication year: 2012
Volume number: 286
Start page: 85
End page: 88
Number of pages: 4
ISSN: 0168-583X
eISSN: 1872-9584
Languages: English-Great Britain (EN-GB)
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Abstract
In this paper, we present the scintillation responses of Pr 3+-doped Lu 3Al 5O 12 single crystals grown by the Czochralski method with different Pr 3+ concentration of 0.19, 0.31, and 0.43 mol% in the crystal. The light yield and energy resolution were measured using photomultiplier tube (XP5200B PMT) readout. High light yield of 15,900 photons per MeV and an energy resolution of 6.5% for 662 keV γ-rays ( 137Cs source) were obtained with the LuAG:Pr (0.19%) crystal. The variation of light yield and energy resolution with praseodymium concentration was also observed. The light yield non-proportionality and energy resolution versus γ-ray energy were measured and the intrinsic resolution was calculated after correcting the measured energy resolution for PMT statistics. Very good proportionality of the light yield was found within 5% over the energy range from 1274.5 keV down to 32 keV. The estimated photofraction for LuAG:Pr in the pulse height spectra of 320 and 662 keV γ-rays was also determined and compared with the ratio of the cross-sections for the photoelectric effect to the total one calculated using WinXCom program. © 2011 Elsevier B.V. All rights reserved.
Keywords
Light yield nonproportionality, Photoelectron yield
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