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The Iran nuclear deal proposes limiting Iran's production of enriched uranium and plutonium – the two fissile materials used to build nuclear weapons – in exchange for the end of international oil and financial sanctions. So far, negotiations have primarily focused on Iran's capacity to produce enriched uranium. But the world’s stockpiles of separated plutonium has grown enormously over the decades. Today, there is enough separated plutonium – which is extracted from highly radioative spent fuel produced by nuclear reactors – to produce 30,000 nuclear bombs, according to metrics provided by the International Atomic Energy Agency.* In this WooCast, we discuss the process of plutonium separation – and its associated risks – with M.V. Ramana, a physicist and lecturer at Princeton University's Program on Science and Global Security, based at the Woodrow Wilson School. Ramana is part of the International Panel on Fissile Materials, an independent group of arms-control experts from 18 countries. The group recently