Special nuclear material (SNM) refers to materials that are used in the context of nuclear energy and weapons. Specifically, it includes: 1. **Plutonium-239 (Pu-239)**: An isotope of plutonium that is fissile, meaning it can sustain a nuclear chain reaction. 2. **Uranium-233 (U-233)**: A fissile isotope of uranium that is produced from thorium-232 and can also sustain a nuclear fission chain reaction.
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