Bio-environmental specialists have not detected any radiation on the Global Hawk aircraft, the Air Force said Monday. The Andersen-based RQ-4 Global Hawk is flying ongoing missions to help the Japanese government as it recovers from a 9.0-magnitude earthquake.

A Global Hawk detachment commander says there are measures in place to ensure the aircraft is free of radiation upon its return. Protecting crews on the ground and the island community remains the main priority.

The Global Hawk flies at high altitudes. So far, it has not been exposed to any detectable levels of alpha, beta or gamma radiation.