Uses of Sodium iodide

Sodium iodide is a white, crystalline salt with chemical formula NaI used in radiation detection, treatment of iodine deficiency, and as a reactant in the Finkelstein reaction.
Uses
Sodium iodide is commonly used to treat and prevent iodine deficiency.
Sodium iodide is used in polymerase chain reactions, and also (as an acetone solution) in the Finkelstein reaction, for conversion of an alkyl chloride into an alkyl iodide.
Sodium iodide activated with thallium, NaI(Tl), when subjected to ionizing radiation, emits photons and is used in scintillation detectors, traditionally in nuclear medicine, geophysics, nuclear physics, and environmental measurements
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