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Show Radioactivity Death Without Noise WASHINGTON An invisible dust of radioactive "death sand" could spread over a city and kill Its population by radioactivity without the noisy warning of an atomic bomb says Dr. Louis N. Ridenour, dean of the University Univer-sity of Illinois graduate school. What would be done would be to collect the debris of smashed uranium atoms from atomic "furnaces" in which fissionable material was being "burned." About a dozen of these fissionable fission-able products would be useful in warfare. Very fine sand would be coated with these radioactive poisons and spread very thinly over the area where it was desired to wipe out life. The person in a poisoned area has no way of knowing that he is in dangpr either by the evidence evi-dence of his senses or by any unsophisticated tests. He may receive a lethal dose of radio-action radio-action before he knows that he is endangered, and yet a few days later he may die. I J i |