镝（原子量：162.500(1)）的同位素中有7個是存在于自然界的穩定同位素，分别是156Dy、158Dy和160Dy至164Dy。自然同位素中豐度最高的是比例為28%的164Dy，緊接著的是比例為26%的162Dy。豐度最低的是比例為0.06%的156Dy。
通過人工合成，科學家共發現了29種放射性同位素，其原子量在138和173之間。最穩定的是154Dy，其半衰期約為1.40年；接著是半衰期為144.4天的159Dy。最不穩定的是138Dy，其半衰期只有200毫秒。比穩定同位素輕的同位素主要進行β+衰變；除個別特例之外，更重的同位素主要進行β−衰變。154Dy主要進行α衰變，152Dy和159Dy則主要進行電子捕獲。
圖表
|-
| 138Dy
| style="text-align:right" | 66
| style="text-align:right" | 72
| 137.96249(64)#
| 200# ms
|
|
| 0+
|
|
|-
| 139Dy
| style="text-align:right" | 66
| style="text-align:right" | 73
| 138.95954(54)#
| 600(200) ms
|
|
| 7/2+#
|
|
|-
| 140Dy
| style="text-align:right" | 66
| style="text-align:right" | 74
| 139.95401(54)#
| 700# ms
|
| 140Tb
| 0+
|
|
|-
| style="text-indent:1em" | 140mDy
| colspan="3" style="text-indent:2em" | 2166.1(5) keV
| 7.0(5) µs
|
|
| (8-)
|
|
|-
| rowspan=2|141Dy
| rowspan=2 style="text-align:right" | 66
| rowspan=2 style="text-align:right" | 75
| rowspan=2|140.95135(32)#
| rowspan=2|0.9(2) s
|
| 141Tb
| rowspan=2|(9/2-)
| rowspan=2|
| rowspan=2|
|-
| , （不常見）
| 140Gd
|-
| rowspan=2|142Dy
| rowspan=2 style="text-align:right" | 66
| rowspan=2 style="text-align:right" | 76
| rowspan=2|141.94637(39)#
| rowspan=2|2.3(3) s
| (99.94%)
| 142Tb
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| , (.06%)
| 141Gd
|-
| rowspan=2|143Dy
| rowspan=2 style="text-align:right" | 66
| rowspan=2 style="text-align:right" | 77
| rowspan=2|142.94383(21)#
| rowspan=2|5.6(10) s
|
| 143Tb
| rowspan=2|(1/2+)
| rowspan=2|
| rowspan=2|
|-
| , （不常見）
| 142Gd
|-
| style="text-indent:1em" | 143mDy
| colspan="3" style="text-indent:2em" | 310.7(6) keV
| 3.0(3) s
|
|
| (11/2-)
|
|
|-
| rowspan=2|144Dy
| rowspan=2 style="text-align:right" | 66
| rowspan=2 style="text-align:right" | 78
| rowspan=2|143.93925(3)
| rowspan=2|9.1(4) s
|
| 144Tb
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| , （不常見）
| 143Gd
|-
| rowspan=2|145Dy
| rowspan=2 style="text-align:right" | 66
| rowspan=2 style="text-align:right" | 79
| rowspan=2|144.93743(5)
| rowspan=2|9.5(10) s
|
| 145Tb
| rowspan=2|(1/2+)
| rowspan=2|
| rowspan=2|
|-
| , （不常見）
| 144Gd
|-
| style="text-indent:1em" | 145mDy
| colspan="3" style="text-indent:2em" | 118.2(2) keV
| 14.1(7) s
|
| 145Tb
| (11/2-)
|
|
|-
| 146Dy
| style="text-align:right" | 66
| style="text-align:right" | 80
| 145.932845(29)
| 33.2(7) s
|
| 146Tb
| 0+
|
|
|-
| style="text-indent:1em" | 146mDy
| colspan="3" style="text-indent:2em" | 2935.7(6) keV
| 150(20) ms
| IT
| 146Dy
| (10+)#
|
|
|-
| rowspan=2|147Dy
| rowspan=2 style="text-align:right" | 66
| rowspan=2 style="text-align:right" | 81
| rowspan=2|146.931092(21)
| rowspan=2|40(10) s
| (99.95%)
| 147Tb
| rowspan=2|1/2+
| rowspan=2|
| rowspan=2|
|-
| , (.05%)
| 146Tb
|-
| rowspan=2 style="text-indent:1em" | 147m1Dy
| rowspan=2 colspan="3" style="text-indent:2em" | 750.5(4) keV
| rowspan=2|55(1) s
| (65%)
| 147Tb
| rowspan=2|11/2-
| rowspan=2|
| rowspan=2|
|-
| IT (35%)
| 147Dy
|-
| style="text-indent:1em" | 147m2Dy
| colspan="3" style="text-indent:2em" | 3407.2(8) keV
| 0.40(1) µs
|
|
| (27/2-)
|
|
|-
| 148Dy
| style="text-align:right" | 66
| style="text-align:right" | 82
| 147.927150(11)
| 3.3(2) min
|
| 148Tb
| 0+
|
|
|-
| 149Dy
| style="text-align:right" | 66
| style="text-align:right" | 83
| 148.927305(9)
| 4.20(14) min
|
| 149Tb
| 7/2(-)
|
|
|-
| rowspan=2 style="text-indent:1em" | 149mDy
| rowspan=2 colspan="3" style="text-indent:2em" | 2661.1(4) keV
| rowspan=2|490(15) ms
| IT (99.3%)
| 149Dy
| rowspan=2|(27/2-)
| rowspan=2|
| rowspan=2|
|-
| (.7%)
| 149Tb
|-
| rowspan=2|150Dy
| rowspan=2 style="text-align:right" | 66
| rowspan=2 style="text-align:right" | 84
| rowspan=2|149.925585(5)
| rowspan=2|7.17(5) min
| (64%)
| 150Tb
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| (36%)
| 146Gd
|-
| rowspan=2|151Dy
| rowspan=2 style="text-align:right" | 66
| rowspan=2 style="text-align:right" | 85
| rowspan=2|150.926185(4)
| rowspan=2|17.9(3) min
| (94.4%)
| 151Tb
| rowspan=2|7/2(-)
| rowspan=2|
| rowspan=2|
|-
| (5.6%)
| 147Gd
|-
| rowspan=2|152Dy
| rowspan=2 style="text-align:right" | 66
| rowspan=2 style="text-align:right" | 86
| rowspan=2|151.924718(6)
| rowspan=2|2.38(2) h
| (99.9%)
| 152Tb
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| (.1%)
| 148Gd
|-
| rowspan=2|153Dy
| rowspan=2 style="text-align:right" | 66
| rowspan=2 style="text-align:right" | 87
| rowspan=2|152.925765(5)
| rowspan=2|6.4(1) h
| (99.99%)
| 153Tb
| rowspan=2|7/2(-)
| rowspan=2|
| rowspan=2|
|-
| (.00939%)
| 149Gd
|-
|154Dy
| style="text-align:right" | 66
| style="text-align:right" | 88
|153.924424(8)
|3.0(15)×106 a
|
| 150Gd
|0+
|
|
|-
| 155Dy
| style="text-align:right" | 66
| style="text-align:right" | 89
| 154.925754(13)
| 9.9(2) h
|
| 155Tb
| 3/2-
|
|
|-
| style="text-indent:1em" | 155mDy
| colspan="3" style="text-indent:2em" | 234.33(3) keV
| 6(1) µs
|
|
| 11/2-
|
|
|-
| 156Dy
| style="text-align:right" | 66
| style="text-align:right" | 90
| 155.924283(7)
| colspan=3 align=center|觀測上穩定
| 0+
| 5.6(3)×10−4
|
|-
| 157Dy
| style="text-align:right" | 66
| style="text-align:right" | 91
| 156.925466(7)
| 8.14(4) h
|
| 157Tb
| 3/2-
|
|
|-
| style="text-indent:1em" | 157m1Dy
| colspan="3" style="text-indent:2em" | 161.99(3) keV
| 1.3(2) µs
|
|
| 9/2+
|
|
|-
| style="text-indent:1em" | 157m2Dy
| colspan="3" style="text-indent:2em" | 199.38(7) keV
| 21.6(16) ms
| IT
| 157Dy
| 11/2-
|
|
|-
| 158Dy
| style="text-align:right" | 66
| style="text-align:right" | 92
| 157.924409(4)
| colspan=3 align=center|觀測上穩定
| 0+
| 9.5(3)×10−4
|
|-
| 159Dy
| style="text-align:right" | 66
| style="text-align:right" | 93
| 158.9257392(29)
| 144.4(2) d
|
| 159Tb
| 3/2-
|
|
|-
| style="text-indent:1em" | 159mDy
| colspan="3" style="text-indent:2em" | 352.77(14) keV
| 122(3) µs
|
|
| 11/2-
|
|
|-
| 160Dy
| style="text-align:right" | 66
| style="text-align:right" | 94
| 159.9251975(27)
| colspan=3 align=center|觀測上穩定
| 0+
| 0.02329(18)
|
|-
| 161Dy
| style="text-align:right" | 66
| style="text-align:right" | 95
| 160.9269334(27)
| colspan=3 align=center|觀測上穩定
| 5/2+
| 0.18889(42)
|
|-
| 162Dy
| style="text-align:right" | 66
| style="text-align:right" | 96
| 161.9267984(27)
| colspan=3 align=center|觀測上穩定
| 0+
| 0.25475(36)
|
|-
| 163Dy
| style="text-align:right" | 66
| style="text-align:right" | 97
| 162.9287312(27)
| colspan=3 align=center|**'
| 5/2-
| 0.24896(42)
|
|-
| 164Dy
| style="text-align:right" | 66
| style="text-align:right" | 98
| 163.9291748(27)
| colspan=3 align=center|**'
| 0+
| 0.28260(54)
|
|-
| 165Dy
| style="text-align:right" | 66
| style="text-align:right" | 99
| 164.9317033(27)
| 2.334(1) h
|
| 165Ho
| 7/2+
|
|
|-
| rowspan=2 style="text-indent:1em" | 165mDy
| rowspan=2 colspan="3" style="text-indent:2em" | 108.160(3) keV
| rowspan=2|1.257(6) min
| IT (97.76%)
| 165Dy
| rowspan=2|1/2-
| rowspan=2|
| rowspan=2|
|-
| (2.24%)
| 165Ho
|-
| 166Dy
| style="text-align:right" | 66
| style="text-align:right" | 100
| 165.9328067(28)
| 81.6(1) h
|
| 166Ho
| 0+
|
|
|-
| 167Dy
| style="text-align:right" | 66
| style="text-align:right" | 101
| 166.93566(6)
| 6.20(8) min
|
| 167Ho
| (1/2-)
|
|
|-
| 168Dy
| style="text-align:right" | 66
| style="text-align:right" | 102
| 167.93713(15)
| 8.7(3) min
|
| 168Ho
| 0+
|
|
|-
| 169Dy
| style="text-align:right" | 66
| style="text-align:right" | 103
| 168.94031(32)
| 39(8) s
|
| 169Ho
| (5/2-)
|
|
|-
| 170Dy
| style="text-align:right" | 66
| style="text-align:right" | 104
| 169.94239(21)#
| 30# s
|
| 170Ho
| 0+
|
|
|-
| 171Dy
| style="text-align:right" | 66
| style="text-align:right" | 105
| 170.94620(32)#
| 6# s
|
| 171Ho
| 7/2-#
|
|
|-
| 172Dy
| style="text-align:right" | 66
| style="text-align:right" | 106
| 171.94876(43)#
| 3# s
|
| 172Ho
| 0+
|
|
|-
| 173Dy
| style="text-align:right" | 66
| style="text-align:right" | 107
| 172.95300(54)#
| 2# s
|
| 173Ho
| 9/2+#
|
|
|}
参考文獻
- Isotope masses from [https://web.archive.org/web/20080923134436/http://www.nndc.bnl.gov/amdc/index.html Ame2003 Atomic Mass Evaluation] by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
- Isotopic compositions and standard atomic masses from [http://www.iupac.org/publications/pac/2003/7506/7506x0683.html Atomic weights of the elements. Review 2000 (IUPAC Technical Report)] . Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and [http://www.iupac.org/news/archives/2005/atomic-weights_revised05.html Atomic Weights Revised (2005)] .
- Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
** Audi, Bersillon, Blachot, Wapstra. [http://amdc.in2p3.fr/web/nubase_en.html The Nubase2003 evaluation of nuclear and decay properties] , Nuc. Phys. A 729, pp. 3-128 (2003).
** National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the [http://www.nndc.bnl.gov/nudat2/ NuDat 2.1 database] (retrieved Sept. 2005).
* David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition*, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.
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