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Nuclear Reactions, Radioactivity, Fission and Fusion - Professor Dave…

- - - - a small particle consisting of a nucleus-originated electron/ positron produced when a neutron spontaneously splits into a proton and an electron (if there is too many neutrons) or when a proton splits into a neutron and a positron (if there are too many protons)
      - can be stopped by a thicker layer of a material (e.g. alluminium can)
      - dangerous to humans
    - - A large particle made of two neutrons and two protons (a helium nucleus)
      - can be stopped by a thin layer of a material (e.g. skin)
      - very dangerous to humans if ingested/inhaled
    - - an electromagnetic wave
      - can be stopped by multiple centimetres of a dense material (e.g lead)
      - harmful to humans in large amounts