Centers for Disease Control and Prevention
Centers for Disease Control: About Radiation Emergencies
Frequently asked questions about radiation that answer how to protect yourself in a radiation emergency, what happens during an exposure, and how exposures usually occur.
CK-12 Foundation
Ck 12: Dangers and Uses of Radiation
[Free Registration/Login may be required to access all resource tools.] Students learn about sources of radiation in the environment, its dangers, and its uses.