Question on: SS2 Physics - Modern Physics - Nuclear Physics

Alpha radiation consists of helium nuclei, which consist of two protons and two neutrons. It has a positive charge and is relatively heavy compared to other types of radiation. Due to its size and charge, alpha particles have low penetrating power and are easily stopped by a few centimetres of air or a sheet of paper. They have high ionising power and can cause significant damage to living tissues when emitted from a radioactive source.