Thanks! Gosh, I thought I'd replied to this. I really appreciate the answers. Bob, I picked up the book you mentioned (I found it quite cheap online), and it's been helpful.
Thank you again for your replies.
After an electron-positron pair is produced by a high-energy photon hitting the nucleus of an atom, is it possible for the produced positron to annihilate with a bound electron from the very same atom it was produced in? In this situation, what would happen to the produced electron--would it be...