Explains how radiation is produced and the characteristics of alpha, beta, and gamma radiation.

A lovely biographical piece about Ernest Rutherford. A number of personal notes, along with extensive information about the physics work he did. Nice quote at the end.

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

Explains what is meant by the half-life of a radioactive element and how it is calculated.