Vivos, Inc. is a radiation oncology medical device company. It is engaged in the development of its yttrium-90 based brachytherapy device, RadioGel, for the treatment of non-resectable tumors. The firm's product, RadioGel, is an injectable particle-gel for brachytherapy radiation treatment of cancerous tumors in people and animals. The company was founded by James C. Katzaroff on December 23, 1994 and is headquartered in Richland, WA.