Weapons-grade nuclear material

Weapons-grade nuclear material refers to fissile material that is suitable for use in nuclear weapons. The most commonly discussed materials in this context are uranium and plutonium. 1. **Uranium**: For uranium to be considered weapons-grade, it typically needs to contain a high percentage of the fissile isotope uranium-235 (U-235). Generally, uranium enriched to about 90% or more U-235 is classified as weapons-grade. Natural uranium contains about 0.