Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Natural positron emitters

  1. Apr 27, 2013 #1
    There are 3 long lived (over 10^9 years) isotopes which may capture electrons and have actually been observed to undergo single beta transmutation.

    Interestingly, all these 3 ALSO can undergo beta decay AND positron emission.

    Potassium 40 has a branching ratio of about 1000 electron captures per positron emission.

    But how about the other two? What are the experimentally observed branching ration between positron emission and electron capture for lanthanum 138 and vanadium 50?
  2. jcsd
  3. Apr 27, 2013 #2


    User Avatar
    Science Advisor

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Natural positron emitters
  1. Positron annihilation (Replies: 30)

  2. Positron emission (Replies: 8)

  3. Positron experiment (Replies: 3)

  4. Manufacture of positrons (Replies: 21)