Science: Tight-Lipped Report

The U.S. Atomic Energy Commission submitted last week a semi-annual report on work-in-progress that did not report very much:

Isotopes. The distribution of radioactive isotopes is growing rapidly. By the end of June, U.S. customers got 3,136 shipments of radioisotopes from the Oak Ridge pile. Foreign countries (none behind the Iron Curtain) got 159.

Radioisotopes have already revolutionized many kinds of research, particularly biology, and are beginning to affect industry. They are chiefly used as "tracers" to mark with exquisite sensitivity the motions or chemical transformations of a substance by "tagging" it with...

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