Growth and scintillation properties of directionally solidified Ce:LaCl3/AECl2 (AE = Mg, Ca, Sr) eutectic Scintillators

Kyoung Jin Kim, Kei Kamada, Rikito Murakami, Masao Yoshino, Shunsuke Kurosawa, Akihiro Yamaji, Yasuhiro Shoji, Vladimir V. Kochurikhin, Hiroki Sato, Satoshi Toyoda, Yuji Ohashi, Takashi Hanada, Yuui Yokota, Akira Yoshikawa

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Abstract

Ce-doped LaCl3/AECl2 (AE = Mg, Ca, Sr) system eutectics were explored. Ce-doped LaCl3/ AECl2 (AE = Mg, Ca, Sr) eutectics were grown using the Bridgman–Stockbarger method in quartz ampoules. In the case of AE = Mg, Ca, eutectics with submicron-diameter phase-separated scintillator fibers (PSSFs) structure were observed. In the case of AE = Sr sample, a solid solution of La0.708Sr0.292Cl2.708 was observed. The plate sample from the grown eutectics has some transparency. The grown eutectic structure showed a mixture of rods and plates shape. This mixed structure was aligned with a length of around 100–400 μm. The Ce:LaCl3/CaCl2 eutectic showed 345 nm emission ascribed to Ce3+ 4f-5d transition under X-ray excitation. The Ce:LaCl3/CaCl2 sample resulted in the highest light output of 9,000 photon/MeV, which is comparable to the previously reported eutectic scintillator Ce:GdAlO3/α-Al2O3, 9500 photon/MeV. Scintillation decay time of the Ce:LaCl3/CaCl2 sample under 662 keV gamma-ray excitation was 26.8 ns (26%) and 282 ns (74%).

Original languageEnglish
Article number126549
JournalJournal of Crystal Growth
Volume584
DOIs
Publication statusPublished - 2022 Apr 15

Keywords

  • A1. Eutectics
  • A2. Bridgman technique
  • B1. Halides
  • B2. Scintillator materials
  • B3. Scintillators

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