토륨 동위 원소
표

| 핵종 기호 | 과거 명칭 | Z(p)> 들뜬 에너지 | N(n)> 들뜬 에너지 |   동위 원소 질량 (u)  > 들뜬 에너지 | 반감기 | 붕괴 방식 | 붕괴 생성물 | 핵 스핀 | 전형적 동위 원소 구성비 (몰 분율) | 자연적 구성비 변동 범위 (몰 분율) |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 209Th |  | 90 | 119 | 209.01772(11) | 7(5) ms [3.8(+69-15)] |  |  | 5/2-# |  |  |
| 210Th |  | 90 | 120 | 210.015075(27) | 17(11) ms [9(+17-4) ms] | α | 206Ra | 0+ |  |  |
| 210Th |  | 90 | 120 | 210.015075(27) | 17(11) ms [9(+17-4) ms] | β+ (드묾) | 210Ac | 0+ |  |  |
| 211Th |  | 90 | 121 | 211.01493(8) | 48(20) ms [0.04(+3-1) s] | α | 207Ra | 5/2-# |  |  |
| 211Th |  | 90 | 121 | 211.01493(8) | 48(20) ms [0.04(+3-1) s] | β+ (드묾) | 211Ac | 5/2-# |  |  |
| 212Th |  | 90 | 122 | 212.01298(2) | 36(15) ms [30(+20-10) ms] | α (99.7%) | 208Ra | 0+ |  |  |
| 212Th |  | 90 | 122 | 212.01298(2) | 36(15) ms [30(+20-10) ms] | β+ (0.3%) | 212Ac | 0+ |  |  |
| 213Th |  | 90 | 123 | 213.01301(8) | 140(25) ms | α | 209Ra | 5/2-# |  |  |
| 213Th |  | 90 | 123 | 213.01301(8) | 140(25) ms | β+ (드묾) | 213Ac | 5/2-# |  |  |
| 214Th |  | 90 | 124 | 214.011500(18) | 100(25) ms | α | 210Ra | 0+ |  |  |
| 215Th |  | 90 | 125 | 215.011730(29) | 1.2(2) s | α | 211Ra | (1/2-) |  |  |
| 216Th |  | 90 | 126 | 216.011062(14) | 26.8(3) ms | α (99.99%) | 212Ra | 0+ |  |  |
| 216Th |  | 90 | 126 | 216.011062(14) | 26.8(3) ms | β+ (0.006%) | 216Ac | 0+ |  |  |
| 216m1Th |  | 2042(13) keV | 2042(13) keV | 2042(13) keV | 137(4) µs |  |  | (8+) |  |  |
| 216m2Th |  | 2637(20) keV | 2637(20) keV | 2637(20) keV | 615(55) ns |  |  | (11-) |  |  |
| 217Th |  | 90 | 127 | 217.013114(22) | 240(5) µs | α | 213Ra | (9/2+) |  |  |
| 218Th |  | 90 | 128 | 218.013284(14) | 109(13) ns | α | 214Ra | 0+ |  |  |
| 219Th |  | 90 | 129 | 219.01554(5) | 1.05(3) µs | α | 215Ra | 9/2+# |  |  |
| 219Th |  | 90 | 129 | 219.01554(5) | 1.05(3) µs | β+ (10−7%) | 219Ac | 9/2+# |  |  |
| 220Th |  | 90 | 130 | 220.015748(24) | 9.7(6) µs | α | 216Ra | 0+ |  |  |
| 220Th |  | 90 | 130 | 220.015748(24) | 9.7(6) µs | ε (2×10−7%) | 220Ac | 0+ |  |  |
| 221Th |  | 90 | 131 | 221.018184(10) | 1.73(3) ms | α | 217Ra | (7/2+) |  |  |
| 222Th |  | 90 | 132 | 222.018468(13) | 2.237(13) ms | α | 218Ra | 0+ |  |  |
| 222Th |  | 90 | 132 | 222.018468(13) | 2.237(13) ms | ε (1.3×10−8%) | 222Ac | 0+ |  |  |
| 223Th |  | 90 | 133 | 223.020811(10) | 0.60(2) s | α | 219Ra | (5/2)+ |  |  |
| 224Th |  | 90 | 134 | 224.021467(12) | 1.05(2) s | α | 220Ra | 0+ |  |  |
| 224Th |  | 90 | 134 | 224.021467(12) | 1.05(2) s | β+β+ (드묾) | 224Ra | 0+ |  |  |
| 225Th |  | 90 | 135 | 225.023951(5) | 8.72(4) min | α (90%) | 221Ra | (3/2)+ |  |  |
| 225Th |  | 90 | 135 | 225.023951(5) | 8.72(4) min | ε (10%) | 225Ac | (3/2)+ |  |  |
| 226Th |  | 90 | 136 | 226.024903(5) | 30.57(10) min | α | 222Ra | 0+ |  |  |
| 227Th | 방사성 악티늄 | 90 | 137 | 227.0277041(27) | 18.68(9) d | α | 223Ra | 1/2+ | 미량 |  |
| 228Th | 방사성 토륨 | 90 | 138 | 228.0287411(24) | 1.9116(16) a | α | 224Ra | 0+ | 미량 |  |
| 228Th | 방사성 토륨 | 90 | 138 | 228.0287411(24) | 1.9116(16) a | CD (1.3×10−11%) | 208Pb 20O | 0+ | 미량 |  |
| 229Th |  | 90 | 139 | 229.031762(3) | 7.34(16)×103 a | α | 225Ra | 5/2+ |  |  |
| 229mTh |  | 0.0076(5) keV | 0.0076(5) keV | 0.0076(5) keV | 70(50) h | IT | 229Th | 3/2+ |  |  |
| 230Th | 이오늄 | 90 | 140 | 230.0331338(19) | 7.538(30)×104 a | α | 226Ra | 0+ | 미량 |  |
| 230Th | 이오늄 | 90 | 140 | 230.0331338(19) | 7.538(30)×104 a | CD (5.6×10−11%) | 206Hg 24Ne | 0+ | 미량 |  |
| 230Th | 이오늄 | 90 | 140 | 230.0331338(19) | 7.538(30)×104 a | SF (5×10−11%) | 다양함 | 0+ | 미량 |  |
| 231Th | 우라늄 Y | 90 | 141 | 231.0363043(19) | 25.52(1) h | β- | 231Pa | 5/2+ | 미량 |  |
| 231Th | 우라늄 Y | 90 | 141 | 231.0363043(19) | 25.52(1) h | α (10−8%) | 227Ra | 5/2+ | 미량 |  |
| 232Th | 토륨 | 90 | 142 | 232.0380553(21) | 1.405(6)×1010 a | α | 228Ra | 0+ | 1.0000 |  |
| 232Th | 토륨 | 90 | 142 | 232.0380553(21) | 1.405(6)×1010 a | β-β- (드묾) | 232U | 0+ | 1.0000 |  |
| 232Th | 토륨 | 90 | 142 | 232.0380553(21) | 1.405(6)×1010 a | SF (1.1×10−9%) | 다양 | 0+ | 1.0000 |  |
| 232Th | 토륨 | 90 | 142 | 232.0380553(21) | 1.405(6)×1010 a | CD (2.78×10−10%) | 182Yb 26Ne 24Ne | 0+ | 1.0000 |  |
| 233Th |  | 90 | 143 | 233.0415818(21) | 21.83(4) min | β- | 233Pa | 1/2+ |  |  |
| 234Th | 우라늄 X1 | 90 | 144 | 234.043601(4) | 24.10(3) d | β- | 234mPa | 0+ | 미량 |  |
| 235Th |  | 90 | 145 | 235.04751(5) | 7.2(1) min | β- | 235Pa | (1/2+)# |  |  |
| 236Th |  | 90 | 146 | 236.04987(21)# | 37.5(2) min | β- | 236Pa | 0+ |  |  |
| 237Th |  | 90 | 147 | 237.05389(39)# | 4.8(5) min | β- | 237Pa | 5/2+# |  |  |
| 238Th |  | 90 | 148 | 238.0565(3)# | 9.4(20) min | β- | 238Pa | 0+ |  |  |