Pu239ksi

Pu239ksi is not a standard designation in nuclear science and may be a typographical variant of plutonium-239 (Pu-239). This article treats Pu-239 in a general, neutral way and notes that the term Pu239ksi, if encountered, may reflect context-specific spelling or transliteration.

Pu-239 is a radioactive, fissile isotope of plutonium with atomic number 94 and a mass number of 239. It is produced in nuclear reactors from uranium-238 through neutron capture and subsequent beta decays. Pu-239 decays primarily by alpha emission to uranium-235, with a half-life of about 24,110 years. As a fissile material, Pu-239 can sustain a fission chain reaction and is one of the principal isotopes considered in nuclear weapons design and certain reactor fuel cycles.

Production and handling of Pu-239 involve complex steps of irradiation, chemical separation, and careful containment due to radiological hazards. In civilian contexts, Pu-239 is encountered mainly in mixed oxide (MOX) fuel and in historical reactor programs; in military contexts, it has been a key component of some nuclear explosive devices. The material is closely regulated to prevent proliferation and to ensure safe transport, storage, and long-term stewardship.

Safety and regulatory aspects emphasize radiological hazards, including inhalation or ingestion risks from finely dispersed particles and environmental contamination. Pu-239 requires specialized facilities, equipment, and trained personnel to minimize exposure and prevent illicit use. International safeguards and national controls aim to monitor and restrict the production, use, and stockpiling of Pu-239 and related materials.

See also: plutonium-238, mixed oxide fuel, nuclear nonproliferation, IAEA safeguards.