Airman 1st Class David Jack uses a gamma-ray spectrometer in an emergency management exercise June 3, 2010, at Ellsworth Air Force Base, S.D. The spectrometer can locate, measure and identify contamination. He is an emergency management journeyman with the 28th Civil Engineer Squadron.
U.S. Air Force photo/Airman 1st Class Corey Hook
November 4, 2012
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