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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 has increased its nearly weapons-grade uranium, a United Nations watchdog found, defying international demands to rein in its nuclear program. Iran now has enough uranium at 60% purity, just ...
According to an audit by the Brookings Institution, between 1940 and 1996, the US spent $11.3 trillion in present-day terms [107] on nuclear weapons programs. 57% of which was spent on building nuclear weapons delivery systems. 6.3% of the total$, 709 billion in present-day terms, was spent on environmental remediation and nuclear waste ...
Iran still has enough of that material, if enriched further, to fuel two nuclear weapons by a theoretical IAEA definition, and enough for more bombs at lower enrichment levels, the report seen by ...