Roughly 12 metric tons of surplus plutonium is currently stored at the Savannah River Site, a figure that was recently declassified by the U.S. Department of Energy, a National Nuclear Security ...

Elements that do not exist in nature—that have been created in a laboratory—are unstable. After hours or days of one element bombarding another with enough energy for both to fuse, the resulting new ...

TOKYO, Jan 28: Enough plutonium to produce 25 nuclear bombs is unaccounted for at a Japanese nuclear facility, but the deficit is mostly due to measuring shortcomings and miscalculations, an official ...