Explains how scientists can tell when radiation has been leaked, how to read a decay graph, what we mean by a half-life, and what carbon dating is.

An interesting essay about the prevalence of radioactivity in nature, with chart showing where it is found and information about half lives.

Find out about the source of heat from the Earth's core. (Published 19 July 2011)

Overview of radioactivity, the process in which particles are emitted from nuclei as a result of nuclear instability.

Entry explores the process of beta decay which occurs when, in a nucleus with too many protons or too many neutrons, one of the protons or neutrons is transformed into the other.

This entry provides a summary of radioactivity in nature and the decay chain.

The Earth has been in a state of continual change since its formation. The major part of this change, involving volcanism and tectonics, has been driven by heat produced from the decay of radioactive elements within the Earth. The other...