Airborne contamination continues to cross the western states, the new data shows, and Boise has seen the highest concentrations of radioactive isotopes in rain so far.

FORBES: Radiation Detected In Drinking Water In 13 More US Cities, Cesium-137 In Vermont Milk

Two years ago, on March 14, 2011, the National Nuclear Security Administration sent flight crews to Japan to monitor airborne and ground contamination from the still developing nuclear crisis at the Fukushima-Daiichi nuclear plant.

FORBES: Drones To Be Deployed As Nuclear Fallout Detectors