Workers have finished cleanup of the F Reactor area at Hanford, a first for a Hanford reactor area, Washington Closure Hanford and the Department of Energy are expected to announce Wednesday. About 1.5 million tons of contaminated material, including building rubble and soil, were removed from the area around F Reactor and away from the Columbia River. Work also included digging up the carcasses of animals used for radiation exposure research in the early years of the Cold War. F Reactor was Hanford’s third reactor and produced plutonium from the mid 1940s to the mid 1960s. Near F Reactor was a laboratory and an animal farm used for radiation exposure research.