It takes just a few pounds of plutonium or highly enriched uranium to create a nuclear bomb. That fact frightens security experts around the world. A small chunk of nuclear material that slipped into the wrong hands would be disastrous.
“This threat is a real and difficult problem,” said Graham Allison, director of the Belfer Center for Science and International Affairs at Harvard University in Cambridge, Massachusetts, and a leading expert on U.S. national security and defense policy with a special interest in terrorism. “We need to harness all the technology available.”