The Hanford Site is a decommissioned nuclear production complex that produced plutonium for most of the 60,000 weapons in the U.S. nuclear arsenal . There are environmental concerns about radioactivity released from Hanford . A number of military accidents involving nuclear weapons have also resulted in radioactive contamination , for example the 1966 Palomares B-52 crash and the 1968 Thule Air Base B-52 crash
1968 Thule Air Base B-52 crash
1968 Thule Air Base B-52 crash
Anthropogenic hazard