plutonium235
Plutonium-235, symbol Pu-235, is a radioactive isotope of plutonium with 94 protons and 141 neutrons. It is fissile, meaning it can sustain a nuclear chain reaction with thermal (slow) neutrons. Pu-235 decays by alpha emission to uranium-231, with a half-life of about 703.8 million years, making it long-lived but radiotoxic when ingested or inhaled.
Natural occurrence and production: Pu-235 is not found in meaningful quantities in nature. It is produced artificially
Uses and significance: Because of its fissile character, Pu-235 is relevant to discussions of nuclear materials,
Safety and handling: Pu-235 emits alpha radiation and poses radiological hazards if materials containing it are