[Red Badger]

http://en.wikibooks.org/wiki/Basic_Physics_of_Nuclear_Medicine/Production_of_Radioisotopes

[Pontiac]

Thanks for the link.

But it only mentions the methods I already knew of; nuclear bombardment by charged particles (adding neutrons), fission and nuclear decay.

Unless you can cause nuclear decay or fission by stimulating the nucleus with a gamma ray I am at a loss as how it is done.