Basics about Radiation - overview of the different types of ionising radiation from the Radiation Effects Research Foundation - a cooperative Japan-United States Research Organization which conducts research for peaceful purposes.
Radiation and Life - an essay by Eric J Hall, Professor of Radiology, Columbia University with sections on the unstable atom, ionising radiation, background radiation, man-made radiation and radioactive decay - from the Uranium Information Centre website.
Radiation and Radioactivity - a self-paced lesson developed by the University of Michigan's Student Chapter of the Health Physics Society, with sections on radiation, radioactivity, the atom, alpha radiation, beta radiation and gamma radiation.
