Science: Billion-Dollar Isotopes

The Atomic Energy Commission, which is not allowed to tell much more than the time of day about the bomb-making business, likes to talk about a less glamorous product of its giant reactors—radioactive isotopes. Last week, at Rutgers University, AECommissioner Joseph Campbell reported on some new uses of radioactive isotopes in U.S. industry. Items:

> A capsule of cobalt-60 (cost: $50) will cast its X-ray beam through metal welding, will easily show up every flaw. This inspection process, too expensive with old-style X-ray machines, increases the welding safety factor, reduces the thickness of...

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