Used in medicine for the treatment of iodine deficiency and as a expectorant in cough syrups. Employed in radiation detection due to its scintillation properties when doped with thallium, making it ideal for gamma-ray spectrometry and nuclear imaging. Utilized in organic synthesis as a source of iodide ions, facilitating various nucleophilic substitution reactions. Applied in animal feed as a nutritional supplement to ensure adequate iodine intake. Also used in the preparation of other iodine-containing compounds and in some cases as a catalyst in chemical reactions.