Science: Measuring the H-Bomb

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Last week, as the scientists had predicted, radioactive dust began to settle out of the stratosphere over Japan. Coming into the troposphere, it mingled with the clouds and fell to earth as radioactive rain. Even before rain fell, the normal air radioactivity of 50 counts per minute rose to 400 counts at Tokyo. Rain at Matsue on the Sea of Japan registered as high as 89,000 counts. Japan's weather bureau announced, to soothe the jittery public, that more radioactive rain was to be expected, but that it would probably not be harmful to humans.