A weapons-grade substance is one that is pure enough to be used to make a nuclear weapon or 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. (These nuclear materials have other categorizations based on their purity.)
Only fissileisotopes of certain elements have the potential for use in nuclear weapons. For such use, the concentration of fissile isotopes uranium-235 and plutonium-239 in the element used must be sufficiently high. Uranium from natural sources is enriched by isotope separation, and plutonium is produced in a suitable nuclear reactor.
Experiments have been conducted with uranium-233. Neptunium-237 and some isotopes of americium might be usable, but it is not clear that this has ever been implemented.
... of pursuing nuclear weapons. Iran is currently enriching uranium to 60% purity, a level close to weapons-grade, making it the only country without a declared nuclear weapons program to do so.
This would leave Britain as the only G7 country without the ability to produce high-grade ‘virgin’ steel, essential for the manufacture of everything from weapons to railway tracks ... high-grade steel.
It appears that all these test explosions were kept as small as possible by using as little fission and fusion fuel as required, in order to conserve weapons-grade fuel, to try to maintain secrecy, ...
Tehran has urged international action against the US presidents reckless and belligerent remarks ... "If they don't make a deal there will be bombing ... The material needs to be around 90% enriched to be considered weapons-grade ... READ MORE ... (RT.com). .
... to international frameworks, despite concerns from the JointComprehensive Plan of Action (IAEA) that the country has ramped up uranium enrichment to 60% purity, approaching weapons-grade levels.
... which Scunthorpe was a part) in the early 20th century, one of his reasons was to ensure a continuing supply of high-quality, weapons-grade steel for the armament industry after the First World War.
However, a February report from the Vienna-based International Atomic Energy Agency, the United Nations’ nuclear watchdog, stated that Iran has increased its production of uranium that is close to weapons grade.
... after US PresidentDonald Trump threatened to bomb Iran unless it signs a deal renouncing nuclear weapons ... Since then, Iran has been building its inventory of uranium enriched just below weapons grade.
A report in February, however, by the Vienna-based International Atomic Energy Agency, the U.N.’s nuclear watchdog, said that Iran has accelerated its production of near weapons-grade uranium.
A report in February, however, by the Vienna-based International Atomic Energy Agency, the U.N.’s nuclear watchdog, said that Iran has accelerated its production of near weapons-grade uranium.
...America cannot allow Iran to acquire a nuclear weapon ... A report by the United Nations\u2019 nuclear watchdog in February stated that Iran had accelerated its production of near-weapons-grade uranium.
— AFP/File...Iran can convert its current stock of 60 per cent enriched uranium into 174 kg of WGU in three weeks at the Fordow Fuel Enrichment Plant (FFEP), enough for seven nuclear weapons, taken as 25 kg of weapon-grade uranium (WGU) per weapon ... .
However, its officials increasingly threaten to pursue a nuclear weapon. Iran now enriches uranium to near weapons-grade levels of 60%, the only country in the world without a nuclear weapons program to do so.