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Pu-239 is produced artificially in nuclear reactors when a neutron is absorbed by U-238, forming U-239, which then decays in a rapid two-step process into Pu-239. [22] It can then be separated from the uranium in a nuclear reprocessing plant. [23] Weapons-grade plutonium is defined as being predominantly Pu-239, typically about 93% Pu-239. [24]
Moreover, 239 Pu and 240 Pu cannot be chemically distinguished, so expensive and difficult isotope separation would be necessary to separate them. Weapons-grade plutonium is defined as containing no more than 7% 240 Pu; this is achieved by only exposing 238 U to neutron sources for short periods of time to minimize the 240 Pu produced.
Pu(C 2 O 4) 2 + 3 F 2 → PuF 6 + 4 CO 2. Alternatively, plutonium(IV) fluoride oxidizes in an 800-°C oxygen atmosphere to plutonium hexafluoride and plutonium(IV) oxide: [7] 3 PuF 4 + O 2 → 2 PuF 6 + PuO 2. In 1984, the synthesis of plutonium hexafluoride at near–room-temperatures was achieved through the use of dioxygen difluoride.
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South African law, like its Roman counterpart, recognises three forms of the contract of lease: locatio conductio rei, or renting or hire of a thing, movable or immovable; locatio conductio operarum, or employment contract or hire of labour between an employer and an employee; and
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