Growth and Scintillation Properties of a New Red-Emitting Scintillator RbHfI for the Fiber-Reading Radiation Monitor

Shohei Kodama, Shunsuke Kurosawa, Yuki Morishita, Hiroshi Usami, Tatsuo Torii, Masateru Hayashi, Makoto Sasano, Tetsushi Azuma, Hiroki Tanaka, Vladimir Kochurikhin, Jan Pejchal, Robert Kral, Masao Yoshino, Akihiro Yamaji, Satoshi Toyoda, Hiroki Sato, Yuji Ohashi, Yuui Yokota, Kei Kamada, Martin NiklAkira Yoshikawa

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A new red-emitting halide scintillator Rb2HfI6 was developed using the vertical Bridgman furnace and quartz ampoule. Under X-ray irradiation, Rb2HfI6 had a broad emission band of around 725 nm. The light output and energy resolution were determined to be 40000 photons/MeV and 7.4% (full-width at half-maximum at 662 keV), respectively. Since red photons are transmitted with smaller losses than blue or yellow photons inside an optical fiber, a long-fiber-reading radiation detection system using the high light-output red scintillator can be established for severe or hazardous environments. We fabricated the Rb2HfI6 scintillation crystal and performed the gamma-ray detection test under high-dose irradiation condition from a 60Co source with an activity of 100 TBq. The dynamic range of the Rb2HfI6 gamma-ray detection with a 20-m optical fiber was evaluated and compared with the previously developed Cs2HfI6 crystal and the conventional deep-red Cr: α-Al2O3 (ruby) scintillator. The gamma-ray doses from 0.4 to 1 kSv/h were successfully measured using Rb2HfI6 through the 20-m fiber.

Original languageEnglish
Article number9016098
Pages (from-to)1055-1062
Number of pages8
JournalIEEE Transactions on Nuclear Science
Issue number6
Publication statusPublished - 2020 Jun


  • Fiber-reading gamma-ray detection
  • red emission
  • scintillators

ASJC Scopus subject areas

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


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