Radioactive Decay - GCSE Physics Definition

Radioactive decay is a natural process where unstable atoms lose energy by releasing radiation. These atoms, called radioactive isotopes, change into different, more stable atoms over time. During this process, they emit particles like alpha, beta, or gamma radiation. This decay happens at a steady rate, which is specific for each type of isotope, and is measured using something called a "half-life." The half-life is the time it takes for half of the radioactive atoms in a sample to decay. Understanding radioactive decay helps us learn about the age of rocks, fossils, and can even be used in medical treatments and energy production.