Powers: Super-strength, flight, and a body that "generates atomic power".
Bio: A professor working on a comics version of the Manhattan Project, Barry Dale found that long-term exposure to radium and uranium didn't kill him, so much as give him super powers.
Notes: Read from today's perspective, the two adventures of Atoman make absolutely no sense at all, and reveal a certain innocence about what might happen to humans if exposed to radiation. A telling passage from the origin story comes when Dale muses to himself after he discovers his super powers:
"Perhaps I am the new type of man who will come into existence as the Atomic Age develops . . . what am I to do with my power? I can use it for good - - or selfishly keep it for my own profit! No! Atomic power cannot belong to one man . . . or group of men . . or even one nation! It belongs to the whole world!"