A large and unstable nucleus is seen undergoing radioactive decay. The formation and nature of alpha, beta and gamma radiation are discussed.

First broadcast:
21 November 2008

This clip could be used to illustrate how radioactive decay can form three types of radiation. This clip follows on from 'Introduction to radioactivity (pt 1/3)'. A comparison of alpha, beta and gamma radiation follows this one clip in 'Introduction to radioactivity (pt 3/3)'