Science: Fall-Out Filter

In an H-bomb attack, U.S. cities as far as 190 miles away from the actual explosion could expect a deadly fallout of wind-borne radioactive particles (TIME, Feb. 28). Last week in Madison, Wis., the U.S. Forest Products Laboratory described a new building material called "diffusion board," that can protect against direct contact with radioactive dust.

Developed for the Army Chemical Corps, diffusion board resembles ordinary wood-pulp fiberboard, ⅝ in. thick. Impregnated with special chemicals (the kinds are still classified), it acts much like an ordinary Army gas mask, filters out gases and germ-carrying...

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