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What is done with this material is a crucial issue, with important ramifications for global security. PLUTONIUM INVENTORIES The world’s stock of plutonium arises from two main sources. One is the plutonium produced for military purposes. This includes plutonium in nuclear weapons; plutonium removed from dismantled nuclear weapons and now in stores; and plutonium in military reserve stocks. The second source of plutonium is that produced in civilian nuclear reactors. This plutonium is in fuel elements in reactors; in spent reactor fuel elements in stores waiting for reprocessing or disposal; going through reprocessing plants; and in civilian plutonium stores.
Pakistan is using this route to produce fissile material for nuclear weapons, South Africa did so, and Iraq was in the process of doing so before the 1991 Gulf War. Pakistan may have produced about 175 kilogrammes of highly-enriched uranium and South Africa may have about 400 kilogrammes (Albright et al. 1992). It is, however, far more difficult to produce highly-enriched uranium than weaponsgrade plutonium. Other Third World countries developing uranium-enrichment capabilities include Argentina, Brazil, India, Iran and Israel.
If the original mass of the plutonium is just less than critical it will, after compression, become super-critical and a nuclear explosion will take place. 92 grammes per cubic centimetre, is used. The delta phase, which has a cubic crystalline form, would be typically stabilized as a gallium alloy. Using implosion the density of the plutonium can be roughly doubled so that a nuclear explosion could, with the best modern design including an effective, but practicable, reflector, be achieved with about 3 kilogrammes of delta-phase Pu-239.