Al Jazeera questions Ahmadi's big announcement today:

John Large, a independent nuclear engineer, said that it was simply not possible for Tehran to have completed the 20 per cent enrichment of any of its stockpile in such a limited time. "Even to produce tiny amounts, representative amounts, of uranium enriched to 20 per cent would be an impossible task," he told Al Jazeera from London. [...] A nuclear bomb requires uranium of about 90 per cent purity, but nuclear experts say getting to 20 per cent is a big step because low-level enrichment is the most time-consuming and difficult stage of the process.

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