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prednisone for humans Beyond enrichment, Iran also agreed to halt work on a planned heavy water reactor in Arak, about 255 kilometers (152 miles) southwest of Tehran. Heavy water is a compound used to cool nuclear reactors, which do not need enriched uranium to operate. Heavy water reactors also produce a greater amount of plutonium as a byproduct, which could be used to make warhead material. Iran does not currently possess the technology to extract the plutonium, and promised in Geneva not to seek it.