Half-lifes and Decay Modes of Isotopes of Plutonium Half-life of Isotopes of Plutonium Isotope Half-life / Decay mode Product 238Pu 87.7 y / alpha decay 234U 239Pu 24 100 y / alpha decay 235U 240Pu 6 560 y / alpha decay 236U 241Pu 14.3 y / beta decay 241Am 242Pu 373 500 y / alpha decay 238U 243Pu 4.96 d / beta decay 243Am 244Pu 80 000 000 y / alpha decay 240Pu Half-lifes of isotopes of plutonium.Source: Java-based Nuclear Data Information SoftwareLibrary: The JEFF-3.1.1 Nuclear Data Library See previous: Plutonium Isotopes See above: Plutonium See next: Plutonium 239