U.S. clears 5 nations of weapons-grade uranium
March 22, 2012
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security summit in Seoul, South Korea, which starts Sunday, to announce similar advances.
Arms control experts say the most difficult part of building an atomic bomb is acquiring the weapons-grade uranium or plutonium needed for the explosive core of the weapon. Locking up or eliminating these materials is crucial to preventing nuclear-armed terror.
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Obama decries Iran's "electronic curtain"
Harrington said that's the administration's top national security concern: "Issue No. 1 ... above anything else, keeping this material out of the hands of terrorists," she said.
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