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Iranian engineers have the know-how to convert the U308 powder back to gas for the enrichment centrifuges, Fitzpatrick said.
"It would not take long to set it up," he said, noting the procedure is similar to the existing conversion line of uranium ore concentrate — known as yellowcake — to a gas known as UF6 that is the feedstock for enrichment.
Matthew Bunn, an associate professor at Harvard’s John F. Kennedy School of Government, also said Iran has the ability to reconvert the oxide into uranium gas.
"It is possible ... Iran has the technology," he said.
Heinonen noted, however, that any debate about Iran’s conversion to the U308 powder "might not really be an issue" since it already has a critical mass of 20 percent enriched uranium.
"And the stocks are likely growing," he said
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