Speaker
Description
In recent years, scintillation detectors using inorganic solid scintillators containing 6Li have been increasingly employed owing to their ease of handling and radiation resistivity. In the past decade, inorganic solid scintillators containing Li, such as Ce or Eu:LiCaAlF6 (LiCAF) [1] and Ce:Cs2LiYCl6 (CLYC) [2], have been developed in addition to the traditional Li-glass scintillator for thermal neutron detection. To achieve neutron detectors with excellent performance, it is necessary to develop scintillators with high Li content, low density, high light yield and fast decay time. In compound crystals, the Li content is limited by the chemical composition. On the other hand, the Li content can be increased in the eutectic according to the phase diagram. Up to now, fluorides such LiF/LiGdF4, LiF/BaCl2, LiF/CaF2/LiBaF3, chlorides such LiCl/Li2SrCl4, LiCl/BaCl2, bromides such LiBr/CeBr3, LiBr/LaBr3 [3], etc. have been reported. Eutectics are composed of neutron-capturing phases containing 6Li and scintillator phases. The 6Li-containing phase converts n-rays into α-rays and 3H, which are absorbed by the scintillator phase and converted into light.
In this study, eutectics with good n/γ-ray discrimination performance were systematically investigated under the material design guideline of combining the γ-ray scintillator phases, which has good α/γ-ray discrimination performance. Tl:CsI/LiBr, Tl:NaI/LiBr, LaBr3/LiBr (pure, Ce and Sr co-doped), and LaCl3/LiCl (pure, Ce doped) were selected as materials meeting the material design guidelines. And for NaI-LiBr, which has not been reported, a state diagram was prepared. In the presentation, details of eutectic growth, structure, and scintillator characterization will be reported. We will also report on the correlation between n/γ-ray discrimination performance and scintillator properties, which is expected from the α/γ-ray discrimination performance of the γ-ray scintillator phases.
[1] Yoshikawa, et al., IEEE Trans. Nucl. Sci. 56 (2009) 3796–3799,
[2] J. Glodo, et al., J. Cryst. Growth, 379 (2013) 73–78,
[3] Y. Takizawa, K. Kamada et al,Nucl. Instr. Method A 1028 (2022), 166384
| Workshop topics | Sensor materials, device processing & technologies |
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