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Technologist: Sniffing Bombs With Mobiles

The project, known as Distributed Nuclear Detection by Ubiquitous Cell Phone, would help locate dirty bombs or nuclear weapons by "triangulating" the source of radiation when people carrying mobile phones pass by. (The greater the number of equipped cell phones, the greater the precision: phones closest to radioactive material will register stronger signals.) The Purdue project and others like it represent a "major shift" in combating radiation terrorism, says Rita Colwell, a former director of the National Science Foundation and now a professor at the University of Maryland.

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