In mid-April,Kenya signed a deal, which will allow the United States to install radiation sensors and other equipment at its busy Mombasa seaport to detect any nuclear or radiological materials that could be smuggled in to be used in a weapon.

VOA: standard.2009.05.01

The stations provide information to many national tsunami information centers and several deep ocean sensors.

VOA: special.2009.03.17

The vests and helmets they are wearing have special sensors, which detect the direction of laser "rounds."

VOA: standard.2010.04.06

Mr.Obama says the change in policy was also prompted by advances in technology, including improvements in land and sea-based interceptors and the sensors that support them.

VOA: standard.2009.09.17