For example, carbon-14 decays to nitrogen-14 when it emits beta radiation. As this breakdown occurs, the activity of any radioactive source becomes less. This activity is measured in becquerels.

Pupils could explore decay chains and complete equations to show radioactive decay processes. They could also plot graphs of given data to calculate half-life.

This is an exceptionally rare decay mode known as bound-state beta decay. Moreover, the nuclear decay leads to an excited state in ²⁰⁵Pb which is situated only by a minuscule 2.3 ...