International Isotopes, Inc. manufactures and sells nuclear medicine calibration and reference standards, cobalt teletherapy sources, and radioisotopes and radiochemicals for medical research, pharmacy compounding, and clinical applications. The company operates in six segments: Nuclear Medicine Standards, Cobalt Products, Radiochemical Products, Fluorine Products, Radiological Services, and Transportation. The Nuclear Medicine Standards segment manufactures sources and standards associated with single photon emission computed tomography imaging, patient positioning, and calibration or operational testing of dose measuring equipment for the nuclear pharmacy industry. It offers flood sources, dose calibrators, rod sources, flexible and rigid rulers, spot markers, pen point markers, and various specialty design items. The Cobalt Products segment produces bulk cobalt; fabricates cobalt capsules for radiation therapy or various industrial applications; and recycles expended cobalt sources. The Radiochemical Products segment produces and distributes various isotopically pure radiochemicals for medical, industrial, and research applications. It provides iodine-131 radiochemical for use in the treatment and diagnosis of diseases of the thyroid gland, such as graves' disease, thyroid cancer, and hyperthyroidism, as well as for breast, lung, prostate, and ovarian cancers. The Fluorine Products segment offers products that are used to support the production and sale of gases produced using its fluorine extraction process. The Radiological Services segment decommissions disused irradiation units, performs sealed source exchanges in irradiation and therapy units, and processes gemstones. The Transportation segment provides transportation services for hazardous and non-hazardous cargo materials. The company sells its products directly to end users and distributors. International Isotopes, Inc. was founded in 1995 and is headquartered in Idaho Falls, Idaho.