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Silica-based scintillators: basic properties of radioluminescence kinetics.

Marjorie Grandvillain1, Marie Vidal2, Joël Hérault2

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Understanding radioluminescence (RL) kinetics in silica-based fiber dosimeters is key for real-time sensing. Pre-irradiation accelerates and improves the repeatability of RL response, offering a simple method for enhanced dosimeter performance.

Keywords:
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Area of Science:

  • Materials Science
  • Radiation Detection
  • Optical Physics

Background:

  • Radioluminescent (RL) silica-based fiber dosimeters are promising for miniaturized, real-time, high dose-rate dosimetry.
  • Accurate assessment of dosimeter performance requires a thorough understanding of RL response kinetics, including rise and fall times.
  • Existing models for RL kinetics in doped silica glasses lack comprehensive understanding of the parameters influencing transient and equilibrium behaviors.

Purpose of the Study:

  • To analyze the kinetics inherent in the standard radioluminescence model for silica-based fiber dosimeters.
  • To investigate the impact of pre-irradiation on RL growth and kinetics.
  • To determine the feasibility of controlling RL kinetics through material trap engineering.

Main Methods:

  • Detailed kinetic analysis of the standard radioluminescence model.
  • Investigation of asymptotic regimes in RL growth for pristine and pre-irradiated samples.
  • Examination of the role of trapping levels and recombination centers in RL kinetics.

Main Results:

  • Pristine samples exhibit complex RL growth kinetics with successive quadratic, linear, and power-law dependencies before reaching a plateau.
  • Pre-irradiation significantly accelerates RL growth by pre-forming recombination centers, not by filling trapping levels.
  • RL intensity reaches equilibrium at the pair generation rate before carrier densities stabilize, influenced by deep trap saturation.

Conclusions:

  • Controlling RL kinetics via material trap engineering is not feasible.
  • Pre-irradiation is identified as the most straightforward method to achieve accelerated and repeatable radioluminescence kinetics in silica-based fiber dosimeters.
  • The findings provide crucial insights for optimizing the design and application of these dosimeters in high dose-rate environments.