Films are typically 10 to 700 μm thick, however structures up to 3 mm in thickness are routinely synthesized. They number into the millions per square centimeter yielding very high resolution X-ray imaging performance. The microcolumns are parallel, needle-like structures controllable in diameter from 250 nm to 10 μm. Microcolumnar film scintillator materials channel and conserve scintillation light within densely packaged, highly uniform microcolumns. ISBN 1-4398-5511-0.RMD has developed vapor-grown microcolumnar Cesium Iodide (CsI:Tl) scintillator film, which has become the standard for diagnostic digital radiography. CRC Handbook of Chemistry and Physics (92nd ed.). Digital Imaging Systems for Plain Radiography. "Digital Radiography Detectors: A Technical Overview" (PDF). Infrared Spectroscopy for Food Quality Analysis and Control. "Luminescence and scintillation properties of CsI: A potential cryogenic scintillator". "Polymorphism of cesium and thallium halides". "Atomic structure and dynamic behaviour of truly one-dimensional ionic chains inside carbon nanotubes". ^ a b Senga, Ryosuke Komsa, Hannu-Pekka Liu, Zheng Hirose-Takai, Kaori Krasheninnikov, Arkady V."Quantum efficiency of cesium iodide photocathodes at soft x-ray and extreme ultraviolet wavelengths". "Equation of state and high-pressure phase transition of CsI". In addition to image intensifier input phosphors, caesium iodide is often also used in medicine as the scintillating material in flat panel x-ray detectors. They should also be coated (typically with germanium) and stored in a desiccator, to minimize interaction with atmospheric water vapors. However, optical-quality CsI crystals are very soft and hard to cleave or polish. It has a wider transmission range than the more common potassium bromide beamsplitters, working range into the far infrared. The drawbacks of CsI are a high temperature gradient and a slight hygroscopicity.Ĭaesium iodide is used as a beamsplitter in Fourier transform infrared (FTIR) spectrometers. It shows two main emission components: one in the near ultraviolet region at the wavelength of 310 nm and one at 460 nm. Pure CsI is a fast and dense scintillating material with relatively low light yield that increases significantly with cooling. Properties Solubility of Csl in water Т (☌)Īn important application of caesium iodide crystals, which are scintillators, is electromagnetic calorimetry in experimental particle physics. As a result, Cs atoms are attracted to the walls and vibrate more strongly than I atoms, which are pushed toward the nanotube axis. This difference was explained by the charge difference between Cs atoms (positive), inner nanotube walls (negative) and I atoms (negative). In such chains I atoms appear brighter than Cs atoms in electron micrographs despite having a smaller mass. Ĭaesium iodide atomic chains can be grown inside double-wall carbon nanotubes. īulk caesium iodide crystals have the cubic CsCl crystal structure, but the structure type of nanometer-thin CsI films depends on the substrate material – it is CsCl for mica and NaCl for LiF, NaBr and NaCl substrates. Synthesis and structure Monatomic caesium halide wires grown inside double-wall carbon nanotubes. Caesium iodide photocathodes are highly efficient at extreme ultraviolet wavelengths. It is often used as the input phosphor of an X-ray image intensifier tube found in fluoroscopy equipment. Caesium iodide or cesium iodide ( chemical formula CsI) is the ionic compound of caesium and iodine.
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