Word: micromicro
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Dates: during 1960-1969
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...something of a national hobby, rooftop Geiger counters started clicking ominously. Scientists caught rain water to measure its activity, and jets brought samples down from the sky. About 30 hours after the explosion the radiation count at Niigata, 180 miles north of Tokyo, rose from zero to 30,000 micromicro-curies per square meter of ground. The level at Tokyo's Institute of Meteorological Research rose from the normal 100 micromicrocuries per square meter to 120,000. This level is the highest since the big Russian test of 1962. but it is not considered dangerous to humans...
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