mmatt9876 I suggest looking at my post on regenerative medicine. Your idea of microscopic robots, is what is called Nano technology, which has lots of potential in the medical world. Although I'm not sure about the gamma ray part.
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I saw somewhere that one day we may be able to download ourselves onto computers. That would be better.
I too have read, and seen this in many works of fiction, and even some nonfiction. However, in order to store the equivalent of one human brain on a computer would take massive amounts of storage. Thousands, if not millions of Terrabytes. With today's technology. I think that would be the ultimate way for immortality though. You should also read the book Footprints of God by Greg Iles. Its a good fiction book that has that sort of science in it... And its not a religious book by any account.