Special Nuclear Material - Category III

Category III

Category III is special nuclear material of low strategic significance.

  • Less than an amount of special nuclear material of moderate strategic significance (see category II above) but more than 15 grams(0.5 oz.) of uranium-235 (contained in uranium enriched to 20 percent or more in U-235 isotope) or 15 grams of uranium-233 or 15 grams of plutonium-239 or the combination of 15 grams when computed by the equation grams = (grams contained U-235) + (grams Pu-239) + (grams U-233); or
  • Less than 10,000 grams but more than 1,000 grams of uranium-235 (contained in uranium enriched to 10 percent or more but less than 20 percent in the U-235 isotope); or
  • 10,000 grams or more of uranium-235 (contained in uranium enriched above natural but less than 10 percent in the U-235 isotope).

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