But depending on how many more centrifuges it activates, it could quickly replace the converted material and reach the 140 kilograms — about 300 pounds — needed for at least one warhead.
Tehran "should be in a position to produce enough (material) for two or three" nuclear warheads by the summer, if does decide to double output in the next few weeks, said Olli Heinonen, the International Atomic Energy Agency's deputy director general in charge of the Iran file until 2010.
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