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radioactivity (tree types of radiation (Beta (Electrons or positrons…

- - - - a neutron gets converted to a proton and an electron. The electron then gets emitted with almost the speed of light.
      - in addition, beta radiation emits either a neutrino or an antineutrino
  - - - Gamma radiations can have other sources which aren't radioaktive, like the sun. However, the radiations is still ionizing.
        
        Gamma has the longest range, and can go through walls. Only thick walls made of ex. concrete or lead can stop the radiation.
  - - - Alfa radiation has the most damaging effect, but has very short range. Therefore it is not dangerous for you unless you get it inside your body.