Radium is the new look and function of xRadon - the original base of Project Radon. The goal of Project Radon is to deliver a variety of 100% decentralized services using the blockchain. Radium is the base blockchain, upon which all current services are built. Radium blockchian services are accessed through the Radium SmartChain. The SmartChain expands the utility of Radium far beyond that of a standard coin, with features such as Username-Address linkage and Proof-Of-Existences all 100% distributed within the blockchain. See the Radium SmartChain thread here for full list of functions and development goals.