In the atomic age, March winds and April showers also bring fallouts from the thin upper air. As spring crept over the Northern Hemisphere last week, scientists everywhere deployed their Geiger count ers, sure that radioactivity would rise with the daffodils.
First measurements came from radio sensitive Japan, where radioactivity had sunk to a comfortably low winter level after last fall's Russian tests in Novaya Zemlya. In December the index figure was an insignificant 6.77 millimicrocuries.* Radioactivity stayed low during January and February, but since then it has climbed steeply. By March it had reached 29-48 millimicrocuries, and scientists of...
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