Plutonium isotopes are variants of the element Plutonium that have the same number of protons but different numbers of neutrons in their atomic nuclei. The most common isotopes are Plutonium-239 and Plutonium-241, which are used in nuclear reactors and weapons due to their ability to undergo fission. Each isotope has unique properties and half-lives, affecting their stability and applications. For instance, Plutonium-239 has a half-life of about 24,100 years, making it suitable for long-term energy production, while Plutonium-241 has a shorter half-life of about 14.4 years, influencing its use in various nuclear processes.