Iran was preparing to notify the International Atomic Energy Agency later on Monday of a nuclear fuel swap deal brokered by Turkey and Brazil, the spokesman of Iran's Atomic Energy Organisation said. 'The letter will be delivered to the IAEA chief at 10:30 am Vienna time (0830 GMT),' Ali Shirzadian told Iran's ISNA news agency. Iran signed a deal last week with Brazil and Turkey -- non-permanent members of the UN Security Council -- to ship over half of its low enriched uranium (LEU) abroad in exchange for fuel for a Tehran medical research reactor. Western governments' reaction has been dismissive to the proposal, which they have said fails to address international concerns about Iran's nuclear programme. Washington has pressed ahead with circulating a new sanctions resolution. 