Formation mechanism of photostimulable centers in image plate phosphors

Martin Hoben; Roland Schmechel; Ruediger Henn; Heinz von Seggern

doi:10.1117/12.366592

19 October 1999 Formation mechanism of photostimulable centers in image plate phosphors

Martin Hoben, Roland Schmechel, Ruediger Henn, Heinz von Seggern

Proceedings Volume 3768, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics; (1999) https://doi.org/10.1117/12.366592
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

In image plate technology the understanding of the radiation-induced generation of photostimulable luminescence centers (PSLCs) is still an unsolved problem in commercially utilized x-ray storage phosphors, such as BaFBr: Eu²⁺ and RbBr:Tl⁺. Two different mechanisms have been proposed: the first one assumes a vacancy-free crystal prior to irradiation known as Itoh process originally proposed for alkali halides whereas the second one relies on a vacancy- containing crystal where the vacancies are assumed to be F⁺-centers. In the present study we area addressing this problem through the determination of the relative concentrations of spatially-correlated and non-correlated centers for samples with different activator concentrations. The PSLC-concentration ratio meaning the concentration of the spatially correlated centers to the total center concentration is measured by means of photostimulated luminescence in the temperature range from LHe to room temperature. It is found that the Eu²⁺-concentration is playing a decisive role in the relative occurrence of the two PSLC-types in the sense that for higher Eu²⁺- contents the ratio of correlated to non-correlated centers is increasing. It will be shown that this result clearly favors the Itoh formation mechanism for x-irradiation induced PSLC generation.

Citation Download Citation

Martin Hoben, Roland Schmechel, Ruediger Henn, and Heinz von Seggern "Formation mechanism of photostimulable centers in image plate phosphors", Proc. SPIE 3768, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics, (19 October 1999); https://doi.org/10.1117/12.366592

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