Uranium 235

Atomic Alloys Amalgamated could always use a research technician. A man like Rosco Cawdor was sure of a job there. The security department hadn't been terribly keen. Cawdor had no living relatives. No one knew him. A few strands of circumstantial evidence were his only proof of identity. He was a brilliant scientist. His great reason d'etre was the new power sphere. It was his brain child, his creation. It looked like opening a whole new field of undreamt of nuclear research. The sphere could hold the secret of unlimited power. It could also hold unlimited danger. The stranger arrived. He looked disconcertingly like Rosco. He said Rosco was not Rosco! He said a lot more . . . somebody disappeared! They tested the power sphere. The all important cut-out fused together. The experiment went mad. The sphere was out of control. Why could Rosco withstand fatal doses of radiation? Who was the stranger? Why did they look alike? What were they after? Could the power sphere be controlled before it destroyed the planet?