Used in medicine for the treatment of iodine deficiency and as an expectorant in cough medications. Commonly employed in radiation detection due to its scintillation properties, especially when doped with thallium, making it effective in gamma-ray spectrometers and nuclear imaging devices. Utilized in organic synthesis as a source of iodide ions, facilitating various nucleophilic substitution reactions. Also applied in animal feed as a nutritional supplement to ensure adequate iodine intake.