镝的同位素
圖表

| 符號 | Z> 激發能量 | N> 激發能量 | 同位素質量（u） > 激發能量 | 半衰期 | 衰變方式 | 衰變產物 | 原子核 自旋 | 相對豐度 （莫耳分率） | 相對豐度 的變化量 （莫耳分率） |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 138Dy | 66 | 72 | 137.96249(64)# | 200# ms |  |  | 0+ |  |  |
| 139Dy | 66 | 73 | 138.95954(54)# | 600(200) ms |  |  | 7/2+# |  |  |
| 140Dy | 66 | 74 | 139.95401(54)# | 700# ms | β+ | 140Tb | 0+ |  |  |
| 140mDy | 2166.1(5) keV | 2166.1(5) keV | 2166.1(5) keV | 7.0(5) µs |  |  | (8-) |  |  |
| 141Dy | 66 | 75 | 140.95135(32)# | 0.9(2) s | β+ | 141Tb | (9/2-) |  |  |
| 141Dy | 66 | 75 | 140.95135(32)# | 0.9(2) s | β+, p （不常見） | 140Gd | (9/2-) |  |  |
| 142Dy | 66 | 76 | 141.94637(39)# | 2.3(3) s | β+ (99.94%) | 142Tb | 0+ |  |  |
| 142Dy | 66 | 76 | 141.94637(39)# | 2.3(3) s | β+, p (.06%) | 141Gd | 0+ |  |  |
| 143Dy | 66 | 77 | 142.94383(21)# | 5.6(10) s | β+ | 143Tb | (1/2+) |  |  |
| 143Dy | 66 | 77 | 142.94383(21)# | 5.6(10) s | β+, p （不常見） | 142Gd | (1/2+) |  |  |
| 143mDy | 310.7(6) keV | 310.7(6) keV | 310.7(6) keV | 3.0(3) s |  |  | (11/2-) |  |  |
| 144Dy | 66 | 78 | 143.93925(3) | 9.1(4) s | β+ | 144Tb | 0+ |  |  |
| 144Dy | 66 | 78 | 143.93925(3) | 9.1(4) s | β+, p （不常見） | 143Gd | 0+ |  |  |
| 145Dy | 66 | 79 | 144.93743(5) | 9.5(10) s | β+ | 145Tb | (1/2+) |  |  |
| 145Dy | 66 | 79 | 144.93743(5) | 9.5(10) s | β+, p （不常見） | 144Gd | (1/2+) |  |  |
| 145mDy | 118.2(2) keV | 118.2(2) keV | 118.2(2) keV | 14.1(7) s | β+ | 145Tb | (11/2-) |  |  |
| 146Dy | 66 | 80 | 145.932845(29) | 33.2(7) s | β+ | 146Tb | 0+ |  |  |
| 146mDy | 2935.7(6) keV | 2935.7(6) keV | 2935.7(6) keV | 150(20) ms | IT | 146Dy | (10+)# |  |  |
| 147Dy | 66 | 81 | 146.931092(21) | 40(10) s | β+ (99.95%) | 147Tb | 1/2+ |  |  |
| 147Dy | 66 | 81 | 146.931092(21) | 40(10) s | β+, p (.05%) | 146Tb | 1/2+ |  |  |
| 147m1Dy | 750.5(4) keV | 750.5(4) keV | 750.5(4) keV | 55(1) s | β+ (65%) | 147Tb | 11/2- |  |  |
| 147m1Dy | 750.5(4) keV | 750.5(4) keV | 750.5(4) keV | 55(1) s | IT (35%) | 147Dy | 11/2- |  |  |
| 147m2Dy | 3407.2(8) keV | 3407.2(8) keV | 3407.2(8) keV | 0.40(1) µs |  |  | (27/2-) |  |  |
| 148Dy | 66 | 82 | 147.927150(11) | 3.3(2) min | β+ | 148Tb | 0+ |  |  |
| 149Dy | 66 | 83 | 148.927305(9) | 4.20(14) min | β+ | 149Tb | 7/2(-) |  |  |
| 149mDy | 2661.1(4) keV | 2661.1(4) keV | 2661.1(4) keV | 490(15) ms | IT (99.3%) | 149Dy | (27/2-) |  |  |
| 149mDy | 2661.1(4) keV | 2661.1(4) keV | 2661.1(4) keV | 490(15) ms | β+ (.7%) | 149Tb | (27/2-) |  |  |
| 150Dy | 66 | 84 | 149.925585(5) | 7.17(5) min | β+ (64%) | 150Tb | 0+ |  |  |
| 150Dy | 66 | 84 | 149.925585(5) | 7.17(5) min | α (36%) | 146Gd | 0+ |  |  |
| 151Dy | 66 | 85 | 150.926185(4) | 17.9(3) min | β+ (94.4%) | 151Tb | 7/2(-) |  |  |
| 151Dy | 66 | 85 | 150.926185(4) | 17.9(3) min | α (5.6%) | 147Gd | 7/2(-) |  |  |
| 152Dy | 66 | 86 | 151.924718(6) | 2.38(2) h | ε (99.9%) | 152Tb | 0+ |  |  |
| 152Dy | 66 | 86 | 151.924718(6) | 2.38(2) h | α (.1%) | 148Gd | 0+ |  |  |
| 153Dy | 66 | 87 | 152.925765(5) | 6.4(1) h | β+ (99.99%) | 153Tb | 7/2(-) |  |  |
| 153Dy | 66 | 87 | 152.925765(5) | 6.4(1) h | α (.00939%) | 149Gd | 7/2(-) |  |  |
| 154Dy | 66 | 88 | 153.924424(8) | 3.0(15)×106 a | α | 150Gd | 0+ |  |  |
| 155Dy | 66 | 89 | 154.925754(13) | 9.9(2) h | β+ | 155Tb | 3/2- |  |  |
| 155mDy | 234.33(3) keV | 234.33(3) keV | 234.33(3) keV | 6(1) µs |  |  | 11/2- |  |  |
| 156Dy | 66 | 90 | 155.924283(7) | 觀測上穩定 | 觀測上穩定 | 觀測上穩定 | 0+ | 5.6(3)×10−4 |  |
| 157Dy | 66 | 91 | 156.925466(7) | 8.14(4) h | β+ | 157Tb | 3/2- |  |  |
| 157m1Dy | 161.99(3) keV | 161.99(3) keV | 161.99(3) keV | 1.3(2) µs |  |  | 9/2+ |  |  |
| 157m2Dy | 199.38(7) keV | 199.38(7) keV | 199.38(7) keV | 21.6(16) ms | IT | 157Dy | 11/2- |  |  |
| 158Dy | 66 | 92 | 157.924409(4) | 觀測上穩定 | 觀測上穩定 | 觀測上穩定 | 0+ | 9.5(3)×10−4 |  |
| 159Dy | 66 | 93 | 158.9257392(29) | 144.4(2) d | ε | 159Tb | 3/2- |  |  |
| 159mDy | 352.77(14) keV | 352.77(14) keV | 352.77(14) keV | 122(3) µs |  |  | 11/2- |  |  |
| 160Dy | 66 | 94 | 159.9251975(27) | 觀測上穩定 | 觀測上穩定 | 觀測上穩定 | 0+ | 0.02329(18) |  |
| 161Dy | 66 | 95 | 160.9269334(27) | 觀測上穩定 | 觀測上穩定 | 觀測上穩定 | 5/2+ | 0.18889(42) |  |
| 162Dy | 66 | 96 | 161.9267984(27) | 觀測上穩定 | 觀測上穩定 | 觀測上穩定 | 0+ | 0.25475(36) |  |
| 163Dy | 66 | 97 | 162.9287312(27) | 稳定 | 稳定 | 稳定 | 5/2- | 0.24896(42) |  |
| 164Dy | 66 | 98 | 163.9291748(27) | 稳定 | 稳定 | 稳定 | 0+ | 0.28260(54) |  |
| 165Dy | 66 | 99 | 164.9317033(27) | 2.334(1) h | β− | 165Ho | 7/2+ |  |  |
| 165mDy | 108.160(3) keV | 108.160(3) keV | 108.160(3) keV | 1.257(6) min | IT (97.76%) | 165Dy | 1/2- |  |  |
| 165mDy | 108.160(3) keV | 108.160(3) keV | 108.160(3) keV | 1.257(6) min | β− (2.24%) | 165Ho | 1/2- |  |  |
| 166Dy | 66 | 100 | 165.9328067(28) | 81.6(1) h | β− | 166Ho | 0+ |  |  |
| 167Dy | 66 | 101 | 166.93566(6) | 6.20(8) min | β− | 167Ho | (1/2-) |  |  |
| 168Dy | 66 | 102 | 167.93713(15) | 8.7(3) min | β− | 168Ho | 0+ |  |  |
| 169Dy | 66 | 103 | 168.94031(32) | 39(8) s | β− | 169Ho | (5/2-) |  |  |
| 170Dy | 66 | 104 | 169.94239(21)# | 30# s | β− | 170Ho | 0+ |  |  |
| 171Dy | 66 | 105 | 170.94620(32)# | 6# s | β− | 171Ho | 7/2-# |  |  |
| 172Dy | 66 | 106 | 171.94876(43)# | 3# s | β− | 172Ho | 0+ |  |  |
| 173Dy | 66 | 107 | 172.95300(54)# | 2# s | β− | 173Ho | 9/2+# |  |  |
1 2 3  畫上#號的數據代表沒有經過實驗的証明，僅為理論推測。
1 2 3 4  用括號括起來的數據代表不確定性。
↑  穩定的衰變產物以粗體表示。
↑  半衰期超过5亿年的衰变产物以粗斜体表示。
↑  Believed to undergo α decay to 152Gd or β+β+ decay to 156Gd with a half-life over 1018 years
↑  Believed to undergo α decay to 154Gd or β+β+ decay to 158Gd
↑  Believed to undergo α decay to 156Gd
↑  Believed to undergo α decay to 157Gd
↑  Believed to undergo α decay to 158Gd
↑  Can undergo [[Beta_decay#Bound-state_β−_decay|bound-state β− decay]] to 163Ho with a half-life of 47 days when fully ionized
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