Enhanced columnar structure in CsI layer by substrate patterning

An approach to the fabrication of a scintillation layer by forming a sequence of columns of regular, controlled size perpendicular to the substrate, which provides a high light collimation property, thereby improving the resolution of the radiation detection is reported. The preparation and morpholo...

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Veröffentlicht in:	IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States) 1992-10, Vol.39 (5), p.1195-1198
Hauptverfasser:	Jing, T., Cho, G., Drewery, J., Fujieda, I., Kaplan, S.N., Mireshghi, A., Perez-Mendez, V., Wildermuth, D.
Format:	Artikel
Sprache:	eng
Schlagworte:	400702 > Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials 440100 > Radiation Instrumentation 664400 > Experimentally Derived Information on Atomic & Molecular Properties-- (1992-) ALKALI METAL COMPOUNDS ATOMIC AND MOLECULAR PHYSICS CESIUM COMPOUNDS CESIUM IODIDES CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Couplings ELECTRON MICROSCOPY ELECTRON TUBES ELEMENTS ETCHING Exact sciences and technology FABRICATION HALIDES HALOGEN COMPOUNDS INORGANIC PHOSPHORS INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY Instruments, apparatus, components and techniques common to several branches of physics and astronomy IODIDES IODINE COMPOUNDS Lighting control MEASURING INSTRUMENTS MICROSCOPY Morphology Optical collimators Optical device fabrication Optical modulation PHOSPHORS PHOTODIODES Physics RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY RADIATION DETECTORS RESOLUTION SCANNING ELECTRON MICROSCOPY SEMICONDUCTOR DETECTORS SEMICONDUCTOR DEVICES SEMICONDUCTOR DIODES SEMIMETALS SI SEMICONDUCTOR DETECTORS SILICON Size control SPATIAL RESOLUTION SUBSTRATES SURFACE FINISHING Transfer functions X- and γ-ray instruments and techniques X-RAY EQUIPMENT 665300 > Interactions Between Beams & Condensed Matter-- (1992-) X-RAY TUBES
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Zusammenfassung:	An approach to the fabrication of a scintillation layer by forming a sequence of columns of regular, controlled size perpendicular to the substrate, which provides a high light collimation property, thereby improving the resolution of the radiation detection is reported. The preparation and morphology of CsI on these patterned substrates are described. The optical properties of evaporated CsI(TI) layers, such as line spread function, transmission and modulation transfer function, are discussed. The results obtained with 200- mu m-thick CsI layers coupled to a linear photodiode array with 20 dots/mm resolution showed that the spatial resolution of CsI(TI) evaporated on patterned substrates was about 75 mu m (FWHM, whereas that of CsI(TI) on flat substrates was about 220 mu m FWHM. Micrographs taken by scanning electron microscopy revealed that these layers retained the well-defined columnar structure originating from substrate patterns. Adhesion and light transmission of CsI(TI) were also improved by patterning the substrate.< >
ISSN:	0018-9499 1558-1578
DOI:	10.1109/23.173177