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Optical Engineering

Study of afterglow in x-ray phosphors for use on fast-framing charge-coupled device detectors
Author(s): John A. Shepherd; Sol M. Gruner; Mark W. Tate; Melvin Tecotzky
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Paper Abstract

There is a need in the x-ray imaging community for phosphors with short persistence (I /Ib<0.1 to 0.01% in less than 0.5 ms). Persistence limits a detector’s performance by defining the minimum xray exposure discernible for a given time after a previous exposure, by ghosting of previous images, and by limiting the dynamic range. We characterize the persistence and relative light output of 25 commercially available and specially synthesized phosphors, five of which are gadolinium oxysulfide (Gd2O2S) with five different activators. The phosphor’s ‘‘practical efficiency’’ is presented for use with either front- or rearilluminated CCDs. The persistence of these phosphors is characterized as a function of x-ray intensity, exposure time, and, when possible, impurity concentrations. Each phosphor’s usefulness for particular x-ray imaging experiments is also discussed.

Paper Details

Date Published: 1 November 1997
PDF: 11 pages
Opt. Eng. 36(11) doi: 10.1117/1.601530
Published in: Optical Engineering Volume 36, Issue 11
Show Author Affiliations
John A. Shepherd, Hologic, Inc. (United States)
Sol M. Gruner, Cornell Univ. (United States)
Mark W. Tate, Princeton Univ. (United States)
Melvin Tecotzky, Thomas Jefferson Univ. (United States)

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