Where from did the Atomic energy originate and how long does it take for the atom to go back to its source?

The body will be respected so long as there is soham (life-breath) in it. That is the sound of Pranava (Om). That is the energy contained in an atom. This energy has its origin in Divinity. None can create it. It takes something like twenty-two thousand crore of years for an atom to go back to its source.