> 160,000 cubic feet (4,530 cubic meters) Much of which stops being radioactive in the first year, > The Energy Department has a backlog of nuclear waste clea

> 160,000 cubic feet (4,530 cubic meters) Much of which stops being radioactive in the first year, > The Energy Department has a backlog of nuclear waste clean up responsibilities, with material dating back to World War II. Which is to be expected given that a (tiny) part of the waste is long term.