Isotope[1] delta T1/2 or Z El A Jpi[2] (MeV)[3] Abundance[4] Decay Mode[5] === === ==== ======= ========= ============= ===================== 109 Mt 266 128.4s 3.4 ms +61-13 A ~100%,SF <= 5.5% 268 70 ms 65 A