One formula stands out in the documents obtained by The Times: UD3, or uranium deuteride. Independent experts have confirmed that the only possible use for UD3 is as a neutron source, the trigger to the chain reaction for a nuclear explosion.
Critically, while other neutron sources have possible civilian uses, UD3 has only one application — to be the metaphorical match that lights a nuclear bomb.
UD3, when used in a neutron initiator, emits a stream of neutrons that ignite the core of a bomb, either weapons-grade uranium or plutonium. The stream of neutrons is released using high explosives to compress a core of solid UD3, creating fusion.
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More News On Iran's Nuclear Weapons Program
Uranium Deuteride Initiators -- Arms Control Wonk
Evidence of Iran's nuclear arms expertise mounts -- Washington Post
Israel: Iran nearing atomic bomb capability -- AP
Iran says report it is working on nuclear trigger is Western invention -- Sydney Morning Herald
Iran denies working on nuclear bomb component -- AFP
U.S. nears sanctions for Iranian nukes -- Washington Times
UN challenges Iran on nuclear triggers -- The Age
Race against time for UN to prevent Iran’s nuclear ambitions -- Times Online
Big powers scrap meeting on Iran nuclear program -- Reuters
Meeting on Iran's nuclear programme cancelled -- BBC