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Sodium iodide (chemical formula NaI) is an ionic compound formed from the chemical reaction of sodium metal and iodine. Under standard conditions, it is a white, water-soluble solid comprising a 1:1 mix of sodium cations (Na +) and iodide anions (I −) in a crystal lattice. It is used mainly as a nutritional supplement and in organic chemistry.
Sodium iodide (NaI) containing a small amount of thallium is used as a scintillator for the detection of gamma waves and zinc sulfide (ZnS) is widely used as a detector of alpha particles. Zinc sulfide is the material Rutherford used to perform his scattering experiment. Lithium iodide (LiI) is used in neutron detectors.
The element is then dissolved in a mildly alkaline solution in the standard manner, to produce 131 I as iodide and hypoiodate (which is soon reduced to iodide). [13] 131 I is a fission product with a yield of 2.878% from uranium-235, [14] and can be released in nuclear weapons tests and nuclear accidents.
The sodium/iodide cotransporter, also known as the sodium/iodide symporter (NIS), [5] is a protein that in humans is encoded by the SLC5A5 gene. [6] [7] [8] It is a transmembrane glycoprotein with a molecular weight of 87 kDa and 13 transmembrane domains, which transports two sodium cations (Na +) for each iodide anion (I −) into the cell. [9]
Sodium salts of long chain sulfonic acids ... sodium iodide, sodium sulfate, sodium bicarbonate and sodium carbonate. Sodium amide (NaNH 2) ...
Iodine-125 is commercially available in dilute NaOH solution as 125 I-iodide (or the hypohalite sodium hypoiodite, NaIO). The radioactive concentration lies at 4 to 11 GBq/mL and the specific radioactivity is > 75 GBq/μmol (7.5 × 10 16 Bq/mol). The chemical and radiochemical purity is high.
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Four inorganic compounds are used as iodide sources, depending on the producer: potassium iodate, potassium iodide, sodium iodate, and sodium iodide. Any of these compounds supplies the body with the iodine required for the biosynthesis of thyroxine (T 4) and triiodothyronine (T 3) hormones by the thyroid gland.