Across the globe, the IAEA and its partners have worked to swap out weapons-grade material with lightly enriched uranium, or LEU, which is enriched at less than 20 percent, and hence unusable for weapons. In all, 33 countries have now become free of HEU, including 11 countries in Africa. With just over 1 kilogram of HEU, the Nigerian material, if stolen, would not be nearly enough to create a full nuclear warhead. However, a terrorist group would be able to
create a dirty bomb with the substance or add the material into a stockpile gathered elsewhere to get close to the amount needed for a large explosion.
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