Alpha radiation consists of alpha particles which are helium nuclei consisting of two protons and two neutrons, which have a positive charge, and can consequently be deflected in a magnetic field. The radiation can produce burns on the human body.and is also capable of inducing artificial radioactivity in some elements. Alpha radiation can pass through thin metal foil (and occasionaly the particles will be deflected as they hit the nuclei of the atoms in the foil), but can only pass through air for a small distance before being absorbed. Alpha radiation has only limited ionization power but is capable of stimulating fluorescence in some elements.