Caesium iodide

Rarity: Uncommon

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Notion

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Science and technology

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Caesium iodide”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Leiem, CC BY-SA 4.0, via Wikimedia Commons.