Abstract
We have developed a structured scintillator using a vacuum deposition technique that is suitable for manufacturing large area scintillators in a microcolumnar form. While providing high absorption efficiency, it also allows great temporal and spatial resolution X-ray imaging. Microcolumnar films of extremely fast and bright cerium-doped lutetium iodide (LuI3:Ce) scintillator were synthesized. It has high density (~5.6 g/cm3), high effective atomic number (59.7), bright green emission (540 nm range, well matched to commercial optics and CCD sensors), light yield exceeding 115,000 ph/MeV, and rapid, afterglow-free decay (~28 ns). This new scintillator could resolve the 153 ns bunch structure of the Advanced Photon Source (APS) at Argonne National Laboratory (ANL). Due to the fast, afterglow-free decay, and high efficiency of LuI3:Ce, during the experiments performed at the 1-ID hard X-ray beamline at the APS, single 65 keV X-ray photons could be resolved with high signal-to-noise ratio and with temporal resolution better than 20ns. In the future, it will enable a wide range of hard X-ray (20 keV to 100 keV) imaging and/or high frame-rate applications such as dynamic studies of the structural and electrochemical properties of batteries using microtomographic X-ray imaging, internal corrosion in fuel cells, and time-resolved muscle diffraction experiments.
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