Radioactive Substances

What is radioactivity? Explore the difference between alpha, beta and gamma radiation and how their different properties can make them useful. Physics - Energy And Radioactivity - Learning Points. Radioactivity is the nuclear decay of unstable elements. Alpha and beta rays are particulate radiation that can be stopped by something thicker than paper. Gamma rays are a type of electromagnetic radiation that is extremely penetrating. Radiation has risks, but it can also be useful in medicine. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.