IsoRay, Inc. develops, manufactures, and sells isotope-based medical products and devices for the treatment of cancer and other malignant diseases in the United States. The company produces CS-1 Cesium-131 brachytherapy seeds for the treatment of prostate, brain, lung, head and neck, gynecological, pelvic/abdominal, and colorectal cancers, as well as ocular melanoma. It sells its products to facilities or physician practices that utilize multiple surgical facilities at which primarily prostate brachytherapy procedures are performed. The company was formerly known as Century Park Pictures Corporation and changed its name to IsoRay, Inc. in 2005. IsoRay, Inc. was founded in 1983 and is headquartered in Richland, Washington.