How to Buy Caesium iodide

Caesium iodide is a very useful material with a transmission range from the visible
region out to 70 microns through to a 2mm thick window. CsI is very soft and water-
soluble and when humidity is relatively high polished surfaces may be damaged by moisture
in the atmosphere.  CsI has a wider transmission range than the more common potassium
bromide beamsplitters, extending usefulness into the far infrared. A problem with
optical-quality CsI crystals is that they are very soft with no cleavage, making it
difficult to create a flat polished surface.
Caesium Iodide is hygroscopic and readily dissolves in water. This property means that it
needs to be kept away from water and also makes it difficult to polish.
An important application of caesium iodide crystals, which are scintillators, is
electromagnetic calorimetry in experimental particle physics, and is sometimes used for
components in the widest range spectrophotometers. An extremely soft material, Caesium
Iodide is extremely difficult to polish, and so performance is compromised for range.
Doped with Thallium, CsI(Tl) is a useful scintillator which emits at a wavelength that is
a good match for Silicon photodiodes. Arrays of Caesium Iodide are used in security
imaging systems. Principally used for Infrared Spectroscopic windows and also for beam
splitters in FTIR Instumentation. CsI is also available thallium doped for scintillation
applications. It is an ionic compound often used as the input phosphor of an x-ray image
intensifier tube found in fluoroscopy equipment.
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