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Related Experiment Videos

Y2O2S:Eu phosphor screens evaluation

G E Giakoumakis1, C D Nomicos, P Skountzos

  • 1Physics Department, University of Ioannina, Greece.

Medical Physics
|January 1, 1993
PubMed
Summary

This study investigates X-ray luminescence in Y2O2S:Eu phosphor screens, detailing efficiency based on tube voltage and screen thickness. Theoretical models explain experimental data, estimating intrinsic efficiency and scattering coefficients.

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Area of Science:

  • Materials Science
  • Luminescence
  • Solid-State Physics

Background:

  • Phosphor screens are crucial for X-ray imaging.
  • Yttrium oxysulfide doped with europium (Y2O2S:Eu) is a key phosphor material.
  • Understanding luminescence efficiency is vital for optimizing imaging performance.

Purpose of the Study:

  • To investigate the X-ray luminescence of Y2O2S:Eu phosphor screens.
  • To determine the dependence of luminescence efficiency on tube voltage and screen thickness.
  • To compare Y2O2S:Eu with Y2O2S:Tb phosphors.

Main Methods:

  • Experimental measurements in transmission and reflection modes.
  • Analysis of absolute luminescence efficiency.
  • Theoretical calculations using the Hamaker-Ludwig model.

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Main Results:

  • Detailed experimental data on efficiency dependence were collected.
  • Y2O2S:Eu and Y2O2S:Tb phosphors were compared.
  • The Hamaker-Ludwig model successfully explained experimental findings.

Conclusions:

  • Theoretical calculations provide a framework for understanding X-ray luminescence in phosphors.
  • Intrinsic efficiency and scattering coefficients for Y2O2S:Eu were estimated.
  • The study offers insights into phosphor screen performance optimization.