Optimization of phosphor concentration of surface‐modified Bi2O3 nanoparticle‐loaded plastic scintillators for high‐energy photon detection

Arisa Magi, Masanori Koshimizu, Akito Watanabe, Akira Yoko, Gimyeong Seong, Takaaki Tomai, Tadafumi Adschiri, Rie Haruki, Fumihiko Nishikido, Shunji Kishiomto, Yutaka Fujimoto, Keisuke Asai

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, the 3-phenylpropionic acid (3-PPA)-modified Bi2O3 nanoparticle-loaded plastic scintillators were synthesized to obtain fast scintillators having high detection efficiency of high-energy X-rays. To reach a high light yield, the content of 2-(4-tert-butylphenyl)-5-(4-phenylphenyl))-1,3,4-oxadiazole (b-PBD) in the plastic scintillators was optimized. The detection efficiency for high-energy photons was enhanced by the incorporation of surface-modified Bi2O3 nanoparticles of less than 10 nm into scintillators at 5 or 10 wt%. In the pulse-height spectra, the photoelectric peak positions were located at the highest channels for the samples containing 0.50 or 1.0 mol% b-PBD regardless of the Bi concentration. The photoelectric peak positions shifted to lower channels with a further increase in the b-PBD concentration, which indicates that the light yield decreased due to concentration quenching. In addition, the time resolution of the detector equipped with the studied samples was of the sub-nanosecond scale, suggesting that they had a very fast response.

Original languageEnglish
Pages (from-to)7987-7999
Number of pages13
JournalJournal of Materials Science: Materials in Electronics
Volume32
Issue number6
DOIs
Publication statusPublished - 2021 Mar

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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