Science: Round-the-World Tracer

The Japanese public does not like radioactive fallout, whether it comes from U.S. or Russian nuclear tests, but Japanese scientists have learned to put it to work. While visiting New York last week, Dr. Yasuo Miyake of Tokyo's Meteorological Research Institute told how radioactive air masses created by the tests are timed, measured and analyzed. Then they are used as tracers to plot the circulation of high altitude winds.

Usually an air mass labeled with radioactivity shows up in Japan a short time after vibrations in the earth, sea or air have disclosed a...

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