Search results
Results from the WOW.Com Content Network
Weapons-grade nuclear material is any fissionable nuclear material that is pure enough to make a nuclear weapon and has properties that make it particularly suitable for nuclear weapons use. Plutonium and uranium in grades normally used in nuclear weapons are the most common examples.
The fissile uranium in nuclear weapon primaries usually contains 85% or more of 235 U known as weapons grade, though theoretically for an implosion design, a minimum of 20% could be sufficient (called weapon-usable) although it would require hundreds of kilograms of material and "would not be practical to design"; [11] [12] even lower ...
The nominal spherical critical mass for an untampered 235 U nuclear weapon is 56 kilograms (123 lb), [6] which would form a sphere 17.32 centimetres (6.82 in) in diameter. The material must be 85% or more of 235 U and is known as weapons grade uranium, though for a crude and inefficient weapon 20% enrichment is sufficient (called weapon(s)-usable).
Iran denies pursuing nuclear weapons. Tehran already has enough material enriched to up to 60% purity to be able to make four nuclear weapons if it enriches it further, according to an IAEA yardstick.
Iran has defied international demands to rein in its nuclear program and has increased its stockpile of uranium enriched to near weapons-grade levels, according to a confidential report by the ...
Iran is now enriching uranium to up to 60% purity and has enough material enriched to that level, if enriched further, for two nuclear weapons, according to the International Atomic Energy Agency ...
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.
Iran has begun enriching uranium close to weapons-grade levels, according to a report released by the United Nations nuclear watchdog Wednesday.