Some environmentalists protested the launch of the nuclear powered Cassini space probe destined for Saturn some years ago. There isn't as much attention being given to the launch of the plutonium-powered Curiosity Mars rover.
The plutonium dioxide fuel is very similar to ceramic. Despite the apparent low radiation risk from the mission launch, NASA, the State of Florida and other federal and local agencies around Kennedy Space Center are making preparations to respond to any launch accident. These precautionary measures will include alerts to direct people to shelters if necessary.
Space .com, 11/23/2011)