Radioactivity -238U radioactive decay series The Decay Path of 4n+2 orU Family n 218 At a decay 21o Major route 206b Pb TI Minor route decayThe Decay Path of 4n + 2 or 238U Family 238 234U U 234Pa 234 230 Th Th 226Ra 22 2Rn 218At 218 214Po Po 214Bi 214Pb 210Po 210Bi 206Pb 210Pb 206Tl 210Tl 206Hg Minor route Major route  decay  decay Radioactivity - 238U radioactive decay series