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Cesium Iodide (CsI)-Beads

  • 7789-17-5

  • CsI

  • 555300BD

  • 99.995 %-99.999 %

  • - 10 mesh

  • 232-145-2

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Characteristic


Caesium iodide or cesium iodide (chemical formula CsI) is the ionic compound of caesium and iodine. It is often used as the input phosphor of an X-ray image intensifier tube found in fluoroscopy equipment. Caesium iodide photocathodes are highly efficient at extreme ultraviolet wavelengths.


Chemical formula:CsI

Molar mass:259.809 g/mol

Appearance:white crystalline solid

Density:4.51 g/cm3

Melting point:632 °C (1,170 °F; 905 K)

Boiling point:1,280 °C (2,340 °F; 1,550 K)

Solubility in water:848 g/L (25 °C)

Magnetic susceptibility (χ):-82.6·10−6 cm3/mol

Refractive index (nD):1.9790 (0.3 µm)

                                     1.7873 (0.59 µm)

                                     1.7694 (0.75 µm)

                                     1.7576 (1 µm)

                                     1.7428 (5 µm)

                                     1.7280 (20 µm)

Crystal structure:CsCl, cP2


Application


An important application of caesium iodide crystals, which are scintillators, is electromagnetic calorimetry in experimental particle physics. Pure CsI is a fast and dense scintillating material with relatively low light yield that increases significantly with cooling. It shows two main emission components: one in the near ultraviolet region at the wavelength of 310 nm and one at 460 nm. The drawbacks of CsI are a high temperature gradient and a slight hygroscopicity.


Caesium iodide is used as a beamsplitter in Fourier transform infrared (FTIR) spectrometers. It has a wider transmission range than the more common potassium bromide beamsplitters, working range into the far infrared. However, optical-quality CsI crystals are very soft and hard to cleave or polish. They should also be coated (typically with germanium) and stored in a desiccator, to minimize interaction with atmospheric water vapors.


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.



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