In the U.S. and Europe, strict secrecy surrounds the methods that are used to detect atomic explosions in another nation's territory. Japan has no atomic weapons and no atomic secrecy, so her scientists can talk. Last week one of them how an unofficial group of Japanese scientists keeps track of both U.S. and Soviet explosions.
According to Dr. Yasuo Miyake, of the Japanese government's Meteorological Research Organization in Tokyo, the detection measures four phenomena: 1) disturbances of atmospheric pressure, 2) variations of tide level (if the explosion is oceanic), 3) variations in atmospheric electricity, 4) radioactivity in rain.
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