Under it, Iran would give up most of its uranium stockpile in return for enriched fuel for a medical reactor.

根据这份合约，伊朗将放弃它的大多数储备铀以换取医用反应器的高浓度燃料。

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Under that arrangement, Russia is providing the enriched uranium fuel for the reactor.

根据有关安排，俄罗斯正在为这个核反应堆提供浓缩铀。

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The IAEA draft deal calls for Iran to ship its stockpile of low-grade enriched uranium to Russia to be transformed into more highly enriched uranium for use in Tehran's medical research reactor.

VOA: standard.2009.10.28

On Monday,Iran formally notified the IAEA of its response to the nuclear-fuel swap deal, under which it would ship some low-enriched uranium to Turkey in return for higher grade fuel for a Tehran research reactor.

VOA: standard.2010.05.25

For uranium to work in a nuclear reactor it must be enriched to contain 2-3% uranium-235 while weapons-grade uranium must contain 90% or more uranium-235.

BBC: Iran installing new Natanz centrifuges, says IAEA

The idea was for Iran to ship 1, 200kg of its low-enriched uranium overseas to produce fuel for a research reactor, thus leaving the country for a while with too small a stockpile with which to make a bomb.

ECONOMIST: Lexington

Nuclear reactor fuel is enriched to 3-5% Uranium-235.

FORBES: What Are The Most Important Things To Know/Understand About Nuclear Energy?