So the main constraint on Iran going nuclear is the availability of fissile material.
Then the Bush administration said it wouldn't accept any verification procedures in any fissile-materials treaty.
Gas centrifuges are used to increase the proportion of fissile uranium-235 atoms within uranium.
To make the fissile material, he needs to develop an ability to enrich uranium.
They set out a four-year timetable to gather up and secure bomb-usable fissile material.
Why would North Korea refrain from selling Iran either fissile material or a crude nuclear weapon?
First, ending the stalemates on the Fissile Material Cut-off Treaty and the Comprehensive Nuclear Test Ban Treaty.
The going for a fissile-material cut-off treaty at the log-jammed Conference on Disarmament could be harder still.
Although not fissile itself, Th-232 will absorb slow neutrons to produce uranium-233 (U-233)a, which is fissile (and long-lived).
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Fissile material in this form is difficult to use in a weapons program, U.S. and European officials say.
North Korea is thought to have enough plutonium-based fissile material for as many as a dozen small bombs.
Fissile material in this form is difficult to use in a weapons program, U.S. and European officials said.
Thorium can be used as a nuclear fuel through breeding to fissile uranium-233.
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In an all too fissile world, Mr Bush has made the anti-proliferation fight a centrepiece of his foreign policy.
North Korea revealed a uranium-enrichment facility at the plant in 2010, another route to provide fissile material for nuclear weapons.
By this time, he said, Tehran will have amassed enough fissile material to quickly assemble one or more atomic weapons.
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He also wants to jump-start long-stalled negotiations on a verifiable treaty to end the production of fissile material for military uses.
Then, last week, the administration jumped on an Algerian proposal to accompany fissile-materials negotiations with informal discussions on space and disarmament.
Argentina, Italy and the United Arab Emirates said they were working to install radiation detectors to check cargo for fissile material.
Al-Qaeda and other militant groups are known to be desperate to get their hands on fissile material or an assembled warhead.
And nuclear experts believe any sign Japan is expanding its ability to produce weapons-usable fissile materials will likely be matched by Beijing.
Acquiring nuclear weapons requires three elements: fissile material (such as highly enriched uranium, HEU, or plutonium), a delivery system and a warhead.
Multicountry negotiations on a fissile-materials ban stalled more than a decade ago.
He could have it earlier if he is able to obtain fissile materials on the outside market, which is possible-difficult but possible.
Uranium enrichment is a process which makes nuclear fuel but can also be diverted to produce the fissile core of atomic bombs.
It seeks a universal ban on fissile materials even though most Russian nuclear power plants generate such potentially deadly stuff as a by-product.
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One reason why many people distrust nuclear power is because they believe it is impossible to separate civil reactors from weapons-grade fissile material.
P-1 centrifuges, configured to produce highly enriched uranium rather than the civilian sort, to produce enough fissile material for a bomb a year.
Last week, the White House scored a breakthrough on a long-stalled international treaty banning all production of fissile materials for nuclear weapons world-wide.
First, under the Clinton administration, some countries demanded that fissile-materials negotiations include formal talks on nuclear disarmament and a ban on weapons in space.
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