radiation detectors

Seen At 11: NYC's Ring Of Protection -- Tools In The Fight Against Dirty BombsWalk around the city, or drive around the suburbs, and there’s a good chance that a dirty bomb detector will check you out.
Sources: Ramped-Up Security In NYC Will Last Through The Week Vehicle checkpoints set up after what authorities described as a specific, credible but unconfirmed threat will remain in place.
Security In New York City Intense On 9/11 AnniversaryFortress New York. That's what it seems like out on the streets of the city on the tenth anniversary of the September 11, 2001 attack on America.
Sources: Authorities Concerned About Possible Dirty Bomb, Times Square StrikeThe crossroads of the world came to a grinding halt at various times Friday because for police Times Square has become the ground zero of the latest terror threat.

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