Growth and luminescent properties of Cs2HfCl6 scintillators doped with alkaline earth metals

Shohei Kodama, Shunsuke Kurosawa, Jan Pejchal, Robert Kral, Akihiro Yamaji, Yuji Ohashi, Yuui Yokota, Kei Kamada, Martin Nikl, Akira Yoshikawa

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Nondoped Cs2HfCl6 (CHC) and alkaline earth metal-doped CHC (AE:CHC) crystals were grown by the vertical Bridgman-Stockbarger method. The spectra of the AE:CHC under X-ray excitation were similar to those for the AE-free crystal; thus, AE doping did not change emission wavelength of CHC. We determined the light outputs and energy resolutions of nondoped CHC and AE:CHC by measuring pulse-height spectra under 662-keV gamma-ray excitation of a 137Cs source. Both light output and energy resolution were deteriorated with AE doping. For example, nondoped CHC had a light output of 44 000 photons/MeV and energy resolution of 5.2%; on the other hand, Sr 0.5 at.%-doped CHC had a light output of only 28 000 photons/MeV and energy resolution of 10%. Scintillation decay also did not change. The nonproportional response values of light output versus gamma-ray energy did not improve in AE:CHC either. Therefore, doped AEs can be responsible for creation of defect trap levels which would hamper the carrier transport in CHC structure.

Original languageEnglish
Article number8387801
Pages (from-to)2169-2173
Number of pages5
JournalIEEE Transactions on Nuclear Science
Volume65
Issue number8
DOIs
Publication statusPublished - 2018 Aug

Keywords

  • Crystal growth
  • nonproportionality
  • scintillators

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering

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