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Sensitization and radiation hardening of the photostimulable X-ray storage phosphor CsBr:Eu2+

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Abstract

The X-ray storage phosphor CsBr:Eu2+ in form of needle image plates is believed to be a promising alternative to the granular BaFBr:Eu2+ with regard to PSL yield and spatial resolution. Unfortunately, CsBr:Eu2+ exhibits poor radiation hardness, which is caused by a migration of europium ions initiated by naturally existing defect centers like (Eu2+-VCs)-centers and X-ray generated MEu-centers. It will be shown that the formation of (Eu2+-O2−)-dipoles at the expense of (Eu2+-VCs)-dipoles, incorporated by thermal annealing in O2-containing and humid atmosphere, does not improve the radiation stability. There is, however, a strong improvement in the radiation hardness by codoping of CsBr:Eu2+ with lithium ions, which is accompanied by a complete suppression of the previously observed MEu-center formation.

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Acknowledgments

The authors would like to acknowledge fruitful discussions, the supply of NIPs and the financial support of Siemens Medical Solutions, Erlangen. One of the authors (GA) also acknowledges financial support from the Alexander von Humboldt Foundation.

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Authors and Affiliations

  1. Electronic Materials Division, Institute of Materials Science, Darmstadt University of Technology, 64287, Darmstadt, Germany

    Graham A. Appleby, Joerg Zimmermann, Sabine Hesse, Oliver Karg & Heinz von Seggern

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  1. Graham A. Appleby
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  2. Joerg Zimmermann
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  3. Sabine Hesse
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  4. Oliver Karg
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  5. Heinz von Seggern
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Correspondence to Heinz von Seggern.

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Appleby, G.A., Zimmermann, J., Hesse, S. et al. Sensitization and radiation hardening of the photostimulable X-ray storage phosphor CsBr:Eu2+ . J Mater Sci: Mater Electron 20 (Suppl 1), 54–58 (2009). https://doi.org/10.1007/s10854-007-9435-x

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