The Family of 232Th (4n) Decay Series
No. of protons
90 228Th 232Th
89 å 228Ac   å a decay
88 224Ra 228Ra
87 å ã b-decay
86 220Rn converts
85 å to isobars
84 212Po 216Po
83 å 212Bi   å
82 208Pb   å 212Pb
81 208Tl
81 No. of neutrons
126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142