Word: mw
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Dates: during 1950-1959
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...happy chance, it turned out that the neon lamps light up when exposed to radar waves with a power density of only 5 or 6 mw. sq. cm.-about half the permissible dose for man. So they are perfect for the purpose, and last indefinitely, Dr. Johnson and two Navy medical colleagues report in the United States Armed Forces Medical Journal. Photo flashbulbs can also be used for a one-shot warning: they go off when exposed to still smaller doses of microwave radiation...