Greetings all. I'm a just a chemist banging my head about some what seems to me as fundamentally a nuclear physics question, so please bear with me. If you have a molecule bearing a radioactive atom, a PET radiotracer, say F-18 FDG or some such beast, and it decays (to O-18 correct?) what exactly happens to the entire molecule? Another way of putting it is: As the positron-neutrino pair is released, is the rest of the tracer molecule blown apart by kinetic energy from the decay event? Or am I thinking too much in a classical sense and you are left with a molecule happily bearing O-18 rather than F-18? And lastly, does the answer depend on what type of decay is occurring?