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Sodium iodide 99+% USP, Ph. Eur
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Sodium iodide is a white, crystalline salt with the molecular formula NaI that is used to detect ionizing radiation, treat iodine deficiency, and produce iodoalkanes in the Finkelstein reaction.
Sodium iodide is often used to treat and prevent iodine deficiency. The radioactive isotopes 123iodine and 131iodine are used as sodium iodide for nuclear medicine diagnostics, especially for thyroid scintigraphy. 131Iodine is used as sodium iodide as part of radioiodine therapy as a therapeutic agent.
Another field of application is the Finkelstein reaction. Here, an alkyl chloride or bromide is treated with sodium iodide in acetone.
The better leaving group displaces iodide, the worse leaving group chloride. The driving force of the reaction is the low solubility of sodium chloride in acetone, which shifts the equilibrium towards the alkyl iodide side. In addition to acetone, THF and acetonitrile can also be used as solvents.
Furthermore, there are numerous reactions analogous to the Finkelstein reaction, e.g. the preparation of trimethylsilyl iodide from trimethylsilyl chloride, acetyl iodide from acetyl chloride and many more.
In crystals doped at part of the sodium (NaI:Tl+) positions with thallium (NaI:Tl+), photons are created by ionizing radiation and can thus be used as scintillation detector, traditionally in nuclear medicine, geophysics, nuclear physics, etc. NaI:Tl+ is the most widely used scintillation material because it produces the most light. The crystals are usually coupled to a photomultiplier and hermetically sealed since NaI is hygroscopic. Some parameters (radiant hardness, afterglow, transparency) can be influenced by controlling the conditions under which the crystal grows. Higher doping crystals are used as high spectroscopic quality X-ray detectors. Sodium iodide can be used as a single crystal or polycrystalline.
Empirical formula NaI
Molar mass (M) 149,89 g/mol
Density (D) 3,5 g/cm³
Boiling point (bp) 1304 °C
Melting point (mp) 651 °C
ADR 9 III
CAS No. [7681-82-5]
H315 Causes skin irritation
H319 Causes serious eye irritation
H372 Causes damage to organs (thyroid gland) through prolonged or repeated exposure (if swallowed)
H400 Very toxic to aquatic life
Precautionary statements - prevention
P273 Avoid release to the environment
P280 Wear protective gloves/eye protection
Precautionary statements - response
P391 Collect spillage