Cesium iodide 3N-5N

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.

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, and a fairly small Molière radius is 3.5 cm. It exhibits 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.

Storage: It should be stored in a ventilated and dry warehouse. The packing should be sealed and keep away from alkali and acid. Handle with care during loading and unloading to prevent glass bottles from breaking.

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