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I Antiparticle vs Particle

  1. Aug 20, 2016 #1
    We know that matter and anti matter annihilate each other if they come together. Then what would happen in a collision of a anti particle with our body?
     
  2. jcsd
  3. Aug 20, 2016 #2

    Dale

    Staff: Mentor

    Such collisions of the human body with antimatter are used routinely in Positron Emission Tomography (PET) a standard medical imaging technology. In PET an unstable tracer is injected which emits positrons, which are antimatter electrons. These positrons annihilate with nearby electrons, and produce photons which are detected by the PET system.
     
  4. Aug 20, 2016 #3
    What would happen to a person if she was submitted to a large number of antiparticles? Would her body disappear? If so, why doesn't it happen to us since we are subjected to a large number of antiparticles that come to the Earth such as the cosmic rays, solar wind, etc...
     
  5. Aug 20, 2016 #4

    Dale

    Staff: Mentor

    It depends on how large a number you are talking about, and how rapid the exposure is. For gradual exposure you will die of radiation poisoning long before disappearing. For large rapid exposures think about nuclear weapons.
     
  6. Aug 20, 2016 #5
    Ok. Thank you.
     
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