A shipment of bomb-grade uranium arrived at a secure facility in Russia on Monday, sent from a research reactor in Poland as part of a race to secure dangerous radioactive material around the world.

星期一，一列装载着核弹级铀材料的专列到达了一处俄罗斯的安全设施。这些核材料来自波兰的一个研究用的反应堆，运送它们，是为了确保世界各地的危险的放射性物质安全的努力的一部分。

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In a major and welcomed development, Russia announced that it will close its last weapons-grade plutonium production reactor.

一项重大、颇受欢迎的进展是俄罗斯宣布将关闭最后一座武器级钚生产反应堆。

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In the way enrichment works, getting from 20% to bomb-usable 90% enrichment takes a lot less effort even than churning out the initial 3.5% reactor-grade stuff still piling up at Natanz.

走浓缩这条路，从20%到可用作造核弹的90%的浓缩所要花费的努力甚至比艰苦地做出开始的3.5%浓度的反应堆物质要少的多。 在纳坦兹，伊朗依然在生产3.5%浓度的浓缩铀。

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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

(Sound) Amid loud acclamations of approval, top hardline Iranian cleric, Hojatoleslam Ahmad Khatami warned the West that Tehran will produce its own high-grade uranium for a medical research reactor, if the UN International Atomic Energy Agency refuses to provide the fuel.

VOA: standard.2009.11.28

While it has depleted its stocks of "reactor-grade" plutonium needed to make the weapons-grade variety, the country has plentiful reserves of uranium ore.

BBC: North Korea nuclear test: No radiation detected

Fourteen years of no-new-nuke-orders later, uranium mining's drop in popularity came with the post-Cold War decision to buy Soviet weapons and turn them into reactor-grade fuel.

FORBES: Yellowcake Fever

The report says that in the last six months, Tehran enriched 970 kilos of uranium to reactor-grade levels, bringing its publicly known stockpile of low enriched uranium to 4, 105 kilos.

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