IsoRay Inc. is a national isotope-based medical company. With its patented radioisotope technology, the Company offers products including Cesium-131 seeds and other relevant treatment medicine for cancer and other malignant diseases. Its subsidiary, IsoRay Medical Inc., is the sole producer of Cesium-131 brachytherapy seeds. Brachytheraphy is when cancer-fighting medical radioisotopes are implanted in or around the affected tissue so to be as close to cancer as possible.