Irans Nuclear Program: Status, Paul K. Kerr, Analyst in Nonproliferation. September 26, 2012
Irans nuclear program began during the 1950s. The United States has expressed concern since the mid-1970s that Tehran might develop nuclear weapons. Irans construction of gas centrifuge based uranium enrichment facilities is currently the main source of proliferation concern. Gas centrifuges enrich uranium by spinning uranium hexafluoride gas at high speeds to increase the concentration of the uranium-235 isotope. Such centrifuges can produce both low-enriched uranium (LEU), which can be used in nuclear power reactors, and weapons-grade highly enriched uranium (HEU), which is one of the two types of fissile material used in nuclear weapons. Obtaining fissile material is widely regarded as the most difficult task in building nuclear weapons. As of May 2012, Iran had produced an amount of LEU containing up to five percent uranium-235 which, if further enriched, could theoretically produce enough HEU for several nuclear weapons. Iran has also produced LEU containing up to 20 percent uranium-235, but, as of May 2012, this amount was not sufficient to yield a sufficient amount of weapons-grade HEU for a weapon.”
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