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A network of cellphones fitted with radiation detectors could monitor cities for 鈥渄irty鈥� bombs.

So say Andrew Longman and colleagues at Purdue University in West Lafayette, Indiana. They have so small they add only an imperceptible weight to a regular smartphone, and just a few dollars to the cost. Readings from thousands of phones, plus their location, can be combined to produce a 鈥渞adiation map鈥� of a city, says Longman. 鈥淓very cellphone sold should be carrying a detector,鈥� he says, to guard against terrorist bombs.

In 2004, cellphones containing sophisticated radiation detectors (New 女生小视频, 11 December 2004, p 21) were designed. But they were so big and expensive, they could only be carried by police and would not have blanketed a city.

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