Word: sugiura
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Dates: during 1950-1959
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...coast of northeast Asia, pick up radioactive dust from Soviet bomb tests, they give out no information whatever. Russian and British airborne atomic detectives are just as uncommunicative. But the Japanese, sitting innocently bombless between Soviet and U.S. test areas, can talk freely. Last week Dr. Yoshio Sugiura of the government's Meteorological Research Institute told a Kyoto meeting of the Japan Chemistry Society what he had deduced from "ashes of death" that fell in his own backyard...
...Sugiura needed no airplane. Last November, just a few days after Japanese meteorologists detected air disturbances from Soviet tests in Siberia, he set two large porcelain dishes filled with water in the yard behind his Tokyo laboratory and let dust settle into them for 24 hours. He evaporated the water and got from each square meter 150 milligrams (.005 oz.) of dust. Most of it was ordinary dirt from Tokyo's grimy atmosphere, but the remainder was highly radioactive, and could be analyzed...
...presence of U-237 as well as fission products in the dust that fell on Tokyo convinced Dr. Sugiura that the Soviet bomb of last November was a "super-U-bomb" like the U.S. Bikini job of 1954 (then popularly known as the hydrogen bomb). In short, it evidently got most of its energy from the fission of cheap, plentiful...