Radnostix, Inc. manufactures and sells nuclear medicine calibration and reference standards, cobalt-60 products, sodium iodide I-131 drug product, and radiochemicals for clinical research and life sciences in the United States and internationally. It operates through five segments: Theranostics Products, Cobalt Products, Calibration & Reference Products, Medical Devices, and Fluorine Products. The Theranostics Products segment produces and distributes Iodine-131 generic drug product and various isotopically pure radiochemicals for medical, industrial, and research applications. The Cobalt Products segment produces cobalt-60 products and services, the fabrication of cobalt-60 sealed sources for radiation therapy, industrial and medical applications, and recycling of expended cobalt-60 sources. The Calibration & Reference Products segment manufactures sources and standards associated with single photon emission computed and positron emission tomography imaging, patient positioning, and calibration or operational testing of dose measuring equipment for the nuclear pharmacy industry. This segment also offers flood sources, dose calibrators, cylinder phantoms, rod sources, line sources, flexible and rigid rulers, spot markers, pen point markers, and various specialty design items. The Medical Devices segment develops EasyFill Automated Capsule System, a robotic lab device. The Fluorine Products segment is involved in the production of small-scale qualification samples of high purity fluoride gas for various industrial applications, as well as development of laboratory and analytical processes required to support the planned uranium de-conversion and fluorine extraction facility. The company sells its products directly to end users and distributors. The company was formerly known as International Isotopes Inc. and changed its name to Radnostix, Inc. in December 2025. Radnostix, Inc. was incorporated in 1995 and is headquartered in Idaho Falls, Idaho.