Development of novel rare earth doped fluoride and oxide scintillators for two-dimensional imaging

A. Yoshikawa, T. Yanagida, Y. Yokota, K. Kamada, N. Kawaguchi, K. Fukuda, A. Yamazaki, K. Watanabe, A. Uritani, T. Iguchi, G. Boulon, M. Nikl

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Two topics were focused. The first one was about the gamma-ray scintillator, Pr3+:Lu3Al5O12 (LuAG). The second one was about neutron scintillator, Ce3+: 6LiCaAlF6 and Eu2+:6LiCaAlF 6 (6LiCAF). Those scintillators have been developed very recently for modern imaging applications in the medical and homeland security fields. In both cases, the rare earth ions are playing the crucial role as emission centers. Pr3+ in LuAG provided fast 5d→4f transition providing noticeably shorter decay time than that of Ce3+. Among several candidate hosts, LuAG showed the best performance. Bulk crystal growth, basic scintillation properties, two-dimensional gamma-ray imaging and positron emission mammography (PEM) application were demonstrated. Due to the international situation, the homeland security was compromized by illicit traffic of explosives, drugs, nuclear materials, etc. and the ways to its improvement became an important R&D topic. For this purpose the Ce and Eu doped LiCAF appeared competitive candidates. Especially, when substitution of 3He neutron detectors was considered, the discrimination ability of gamma-ray from alpha-ray was important. Bulk crystal growth, basic scintillation properties and two-dimensional neutron imaging were demonstrated.

Original languageEnglish
Pages (from-to)1178-1182
Number of pages5
JournalJournal of Rare Earths
Issue number12
Publication statusPublished - Dec 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Geochemistry and Petrology


Dive into the research topics of 'Development of novel rare earth doped fluoride and oxide scintillators for two-dimensional imaging'. Together they form a unique fingerprint.

Cite this