This page discusses uranium isotopes decaying into plutonium-239, utilized in nuclear weapons and reactors. Plutonium has a half-life of 24,100 years, leading to long-term contamination risks. The con...This page discusses uranium isotopes decaying into plutonium-239, utilized in nuclear weapons and reactors. Plutonium has a half-life of 24,100 years, leading to long-term contamination risks. The concept of half-life, which varies among isotopes, is essential for predicting radioactivity and managing radioactive materials and their environmental effects until they decay into stable products, such as lead from uranium.