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  2. Fissile material - Wikipedia

    en.wikipedia.org/wiki/Fissile_material

    As a result, fissile materials (such as uranium-235) are a subset of fissionable materials. Uranium-235 fissions with low-energy thermal neutrons because the binding energy resulting from the absorption of a neutron is greater than the critical energy required for fission; therefore uranium-235 is fissile. By contrast, the binding energy ...

  3. Nuclear weapon design - Wikipedia

    en.wikipedia.org/wiki/Nuclear_weapon_design

    Uranium's most common isotope, 238 U, is fissionable but not fissile, meaning that it cannot sustain a chain reaction because its daughter fission neutrons are not (on average) energetic enough to cause follow-on 238 U fissions. However, the neutrons released by fusion of the heavy hydrogen isotopes deuterium and tritium will fission 238 U.

  4. Special nuclear material - Wikipedia

    en.wikipedia.org/wiki/Special_nuclear_material

    Special nuclear material (SNM) is a term used by the United States Nuclear Regulatory Commission to classify fissile materials.The NRC divides special nuclear material into three main categories, according to the risk and potential for its direct use in a clandestine nuclear weapon or for its use in the production of nuclear material for use in a nuclear weapon.

  5. Weapons-grade nuclear material - Wikipedia

    en.wikipedia.org/wiki/Weapons-grade_nuclear_material

    Experiments have been conducted with uranium-233 (the fissile material at the heart of the thorium fuel cycle). Neptunium-237 and some isotopes of americium might be usable, but it is not clear that this has ever been implemented. The latter substances are part of the minor actinides in spent nuclear fuel. [6]

  6. Nuclear criticality safety - Wikipedia

    en.wikipedia.org/wiki/Nuclear_criticality_safety

    Therefore, the shape of the fissile material affects the probability of occurrence of fission events. A shape with a large surface area, such as a thin slab, favors leakage and is safer than the same amount of fissile material in a small, compact shape such as a cube or sphere. Interaction of units: Neutrons leaking from one unit can enter ...

  7. Nuclear material - Wikipedia

    en.wikipedia.org/wiki/Nuclear_material

    Nuclear material refers to the metals uranium, plutonium, and thorium, in any form, according to the IAEA.This is differentiated further into "source material", consisting of natural and depleted uranium, and "special fissionable material", consisting of enriched uranium (), uranium-233, and plutonium-239.

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  9. Tamper (nuclear weapon) - Wikipedia

    en.wikipedia.org/wiki/Tamper_(nuclear_weapon)

    In a nuclear weapon, a tamper is an optional layer of dense material surrounding the fissile material.It is used in nuclear weapon design to reduce the critical mass and to delay the expansion of the reacting material through its inertia, which delays the thermal expansion of the fissioning fuel mass, keeping it supercritical longer.

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