This toolkit is available in English. The Department of Health and Human Services (HHS) has developed a new downloadable online diagnostic and treatment toolkit designed for health care providers, primarily physicians, who may have to provide medical care during a radiation incident. The new information package includes easy-to-follow procedures for diagnosis and management of radiation contamination and exposure, guidance for the use of radiation medical countermeasures, and a variety of other features to facilitate medical responses. Guidance on diagnosis and treatment will help health care providers by describing: types of radiation emergencies they may face; initial medical actions at the incident site and or medical facility; and key steps in patient care. Critical information is presented in a format that will quickly and efficiently orient and guide health care providers during a mass casualty radiation event. In addition to online access, federal, state and local medical response teams will be able to download REMM information on laptop computers for quick access when they are deployed to a radiation incident or for training sessions.