Growth and luminescent properties of Cs.sub.2./sub.HfCl.sub.6./sub. scintillators doped with alkaline earth metals

0500635 - FZÚ 2019 RIV US eng J - Článek v odborném periodiku
Kodama, S. - Kurosawa, S. - Pejchal, Jan - Král, Robert - Yamaji, A. - Ohashi, Y. - Yokota, Y. - Kamada, K. - Nikl, Martin - Yoshikawa, A.
Growth and luminescent properties of Cs₂HfCl₆ scintillators doped with alkaline earth metals.
IEEE Transactions on Nuclear Science. Roč. 65, č. 8 (2018), s. 2169-2173. ISSN 0018-9499. E-ISSN 1558-1578
Grant CEP: GA ČR GJ18-17555Y
Institucionální podpora: RVO:68378271
Klíčová slova: crystal growth * nonproportionality * scintillators
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 1.428, rok: 2018

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. Nondoped CHC had a light output of 44000 photons/MeV and energy resolution of 5.2%, the 0.5 at% Sr:CHC had a light output of only 28000 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. The doped AEs can be responsible for creation of defect trap levels which would hamper the carrier transport in CHC structure.
Trvalý link: http://hdl.handle.net/11104/0292716