Word: ultraviolet
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Dates: during 1960-1969
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...made surgically pure by being pumped through a 7-ft. cube housing 72 small cylinders, each containing an ultraviolet arc. The cylinders were designed so that every passing air particle swirled within 3 in. of a germ-killing arc light. Since ultraviolet rays kill germs more effectively at close range-their germicidal effect is proportionate to the square root of the distance-a microbe had only 1/256th as much chance of surviving a trip through the cylinders as it would have under an ultraviolet lamp hanging 4 ft. above the operating table...