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Molecules with 100 or so electrons to annihilate faster

  1. Dec 12, 2009 #1
    I think the reason for molecules with 100 or so electrons to annihilate faster with a positron is because the electrons are quantum mechanicly smeared across a larger area.
  2. jcsd
  3. Dec 12, 2009 #2
  4. Dec 12, 2009 #3


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    Re: Annihilation

    Polymers are mostly CmHn or CmHnOp and insulators are metal oxides, usually richer in oxygen. C, H and O have relatively low electron density, as opposed to metals, from period 4 and greater, have much greater electron density - which means greater LET (linear energy transfer) or greater stopping power, and more electrons with which to annihilate
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