Attenuation characteristics of a Ce:Gd3Al2Ga3O12 scintillator

Nagomi Uchida, Hiromitsu Takahashi, Masanori Ohno, Tsunefumi Mizuno, Yasushi Fukazawa, Masao Yoshino, Kei Kamada, Yuui Yokota, Akira Yoshikawa

Research output: Contribution to journalArticlepeer-review

Abstract

Attenuation characteristics of scintillation photons from Ce-doped Gd3Al2Ga3O12 (Ce:GAGG) scintillators were investigated by measuring samples of various sizes. Scintillation light is attenuated by two factors. The first is self-absorption of the Ce:GAGG scintillator itself, and the second is geometrical effects such as reflection properties caused by reflector wrapping. The attenuation coefficient of the Ce:GAGGs was determined as 0.00155±0.00006 mm −1 indicating that the scintillation light decays to 1/e as it passes approximately 645 ± 26 mm through the Ce:GAGG. This attenuation does not affect the entire wavelength range; however, it significantly occurs only in the wavelength range from 460 nm to 510 nm where emission and absorption overlap. In the narrow Ce:GAGG scintillator used in this experiment, the geometrical attenuation effect was in the overall wavelength, and the attenuation coefficient was 0.010 ± 0.001 mm −1. In this setup, the self-absorption effect only occupied 10% of the whole attenuation, while geometrical attenuation significantly affected the number of detected photons.

Keywords

  • Ce:GAGG
  • Scintillator
  • Self-absorption

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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