Used in radiation detection and monitoring due to its scintillation properties when exposed to ionizing radiation. Commonly found in handheld and fixed radiation detectors, especially in nuclear medicine and environmental safety. Also serves as a source of iodide in pharmaceuticals and nutritional supplements, supporting thyroid function. Employed in organic synthesis as a catalyst or reagent, particularly in Finkelstein reactions where halide exchange is required. Its water solubility makes it suitable for aqueous-based chemical processes and formulations.