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Proton damage in (Y,Lu,Gd)3(Al,Ga)5O12:Ce mixed garnet scintillators.

L Tafoya1, V Geppert-Kleinrath1, E Smith2

  • 1P-1 Dynamic Imaging and Radiography, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

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|November 1, 2022
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Summary

This study investigates radiation damage in mixed garnet scintillators for fusion instrumentation. Optimal cerium doping for Y2LuAl5O12 was found to be 0.60-0.75 mol.% for enhanced radiation tolerance.

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Area of Science:

  • Materials Science
  • Nuclear Instrumentation
  • Plasma Diagnostics

Background:

  • Scintillators are crucial for nuclear instrumentation, particularly in plasma diagnostics and imaging.
  • Increasing yields in fusion experiments necessitate robust scintillator materials with high radiation tolerance.
  • Radiation exposure can degrade scintillating materials and affect their optical properties.

Purpose of the Study:

  • To investigate the effects of radiation damage on Ce-doped mixed garnet ceramics.
  • To determine the compositional range of (Y,Gd,Lu)3(Al,Ga)5O12 most resistant to radiation.
  • To identify the optimal cerium dopant concentration for improved radiation tolerance in Y2LuAl5O12.

Main Methods:

  • Samples of Ce-doped mixed garnet ceramics were exposed to 200 keV protons up to a fluence of 10^16 protons/cm^2.
  • Diffuse Reflectance Spectroscopy (DRS) was used to characterize radiation-induced absorption.
  • DRS was employed to assess the radiation tolerance of opaque, polycrystalline samples.

Main Results:

  • Qualitative trends in induced absorption were observed as a function of ceramic composition.
  • The study identified specific compositional ranges within (Y,Gd,Lu)3(Al,Ga)5O12 exhibiting varying radiation tolerance.
  • The ideal cerium dopant concentration for Y2LuAl5O12 was determined to be between 0.60-0.75 mol.%.

Conclusions:

  • Ce-doped mixed garnet ceramics show promise as radiation-tolerant scintillators for demanding applications.
  • Polycrystalline ceramics offer advantages for characterization and fabrication compared to single crystals.
  • Optimizing composition and dopant concentration is key to developing advanced scintillators for high-radiation environments.