Radioactivity+Summary



Alpha radiation is the least penetrating. It can be stopped (or absorbed) by a few centimetres of air, or just a sheet of paper. Beta radiation can penetrate air and paper. It can be stopped by a thin sheet of aluminium. Gamma radiation is the most penetrating. It can penetrate air, paper or thin metal. It can only be stopped by many centimetres of lead or many metres of concrete.
 * 1. Alpha radiation**
 * 2. Beta radiation**
 * 3. Gamma radiation**


 * [|The uses of radioactivity]**
 * Quiz**