Isotop terbium

**[[Terbium]]** (**<sub>65</sub>Tb**) yang terbentuk secara alami hanya terdiri dari satu isotop stabil, 159Tb; oleh karena itu, terbium adalah unsur monoisotop dan mononuklida. Tiga puluh enam radioisotop telah dikarakterisasi, dengan yang paling stabil adalah 158Tb dengan waktu paruh 180 tahun, 157Tb dengan waktu paruh 71 tahun, dan 160Tb dengan waktu paruh 72,3 hari. Semua isotop radioaktif yang tersisa memiliki waktu paruh kurang dari 6,907 hari, dan sebagian besar memiliki waktu paruh kurang dari 24 detik. Unsur ini juga memiliki 27 keadaan meta, dengan yang paling stabil adalah 156m1Tb (*t*1/2 = 24,4 jam), 154m2Tb (*t*1/2 = 22,7 jam) dan 154m1Tb (*t*1/2 = 9,4 jam).

Mode peluruhan utama sebelum isotop stabil yang paling melimpah, 159Tb, adalah penangkapan elektron, dan mode utama sesudahnya adalah peluruhan beta. Produk peluruhan utama sebelum 159Tb adalah isotop unsur 64 (gadolinium) dan produk utama sesudahnya adalah isotop unsur 66 (disprosium).

## Daftar isotop

|-
| 135Tb
| style="text-align:right" | 65
| style="text-align:right" | 70
|
| 0,94(+33−22)&nbsp;mdtk
|
|
| (7/2−)
|
|
|-
| 136Tb
| style="text-align:right" | 65
| style="text-align:right" | 71
| 135,96138(64)#
| 0,2# dtk
|
|
|
|
|
|-
| 137Tb
| style="text-align:right" | 65
| style="text-align:right" | 72
| 136,95598(64)#
| 600#&nbsp;mdtk
|
|
| 11/2−#
|
|
|-
| rowspan=2|138Tb
| rowspan=2 style="text-align:right" | 65
| rowspan=2 style="text-align:right" | 73
| rowspan=2|137,95316(43)#
| rowspan=2|800#&nbsp;mdtk [>200&nbsp;ndtk]
| β<sup>+</sup>
| 138Gd
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| p
| 137Gd
|-
| 139Tb
| style="text-align:right" | 65
| style="text-align:right" | 74
| 138,94829(32)#
| 1,6(2)&nbsp;dtk
| β+
| 139Gd
| 11/2−#
|
|
|-
| rowspan=2|140Tb
| rowspan=2 style="text-align:right" | 65
| rowspan=2 style="text-align:right" | 75
| rowspan=2|139,94581(86)
| rowspan=2|2,4(2)&nbsp;dtk
| β+ (99,74%)
| 140Gd
| rowspan=2|5
| rowspan=2|
| rowspan=2|
|-
| β+, p (0,26%)
| 139Eu
|-
| 141Tb
| style="text-align:right" | 65
| style="text-align:right" | 76
| 140,94145(11)
| 3,5(2)&nbsp;dtk
| β+
| 141Gd
| (5/2−)
|
|
|-
| style="text-indent:1em" | 141mTb
| colspan="3" style="text-indent:2em" | 0(200)#&nbsp;keV
| 7,9(6)&nbsp;dtk
| β+
| 141Gd
| 11/2−#
|
|
|-
| rowspan=2|142Tb
| rowspan=2 style="text-align:right" | 65
| rowspan=2 style="text-align:right" | 77
| rowspan=2|141,93874(32)#
| rowspan=2|597(17)&nbsp;mdtk
| β+
| 142Gd
| rowspan=2|1+
| rowspan=2|
| rowspan=2|
|-
| β+, p
| 141Eu
|-
| rowspan=2 style="text-indent:1em" | 142m1Tb
| rowspan=2 colspan="3" style="text-indent:2em" | 280,2(10)&nbsp;keV
| rowspan=2|303(17)&nbsp;mdtk
| IT (99,5%)
| 142Tb
| rowspan=2|(5−)
| rowspan=2|
| rowspan=2|
|-
| β+ (0,5%)
| 142Gd
|-
| style="text-indent:1em" | 142m2Tb
| colspan="3" style="text-indent:2em" | 621.4(11)&nbsp;keV
| 15(4)&nbsp;µdtk
|
|
|
|
|
|-
| 143Tb
| style="text-align:right" | 65
| style="text-align:right" | 78
| 142,93512(6)
| 12(1)&nbsp;dtk
| β+
| 143Gd
| (11/2−)
|
|
|-
| style="text-indent:1em" | 143mTb
| colspan="3" style="text-indent:2em" | 0(100)#&nbsp;keV
| +
| 143Gd
| 5/2+#
|
|
|-
| rowspan=2|144Tb
| rowspan=2 style="text-align:right" | 65
| rowspan=2 style="text-align:right" | 79
| rowspan=2|143,93305(3)
| rowspan=2|~1 dtk
| β+
| 144Gd
| rowspan=2|1+
| rowspan=2|
| rowspan=2|
|-
| β+, p (langka)
| 143Eu
|-
| rowspan=3 style="text-indent:1em" | 144m1Tb
| rowspan=3 colspan="3" style="text-indent:2em" | 396,9(5)&nbsp;keV
| rowspan=3|4,25(15)&nbsp;dtk
| IT (66%)
| 144Tb
| rowspan=3|(6−)
| rowspan=3|
| rowspan=3|
|-
| β+ (34%)
| 144Gd
|-
| β+, p (143Eu
|-
| style="text-indent:1em" | 144m2Tb
| colspan="3" style="text-indent:2em" | 476,2(5)&nbsp;keV
| 2,8(3)&nbsp;µdtk
|
|
| (8−)
|
|
|-
| style="text-indent:1em" | 144m3Tb
| colspan="3" style="text-indent:2em" | 517,1(5)&nbsp;keV
| 670(60)&nbsp;ndtk
|
|
| (9+)
|
|
|-
| style="text-indent:1em" | 144m4Tb
| colspan="3" style="text-indent:2em" | 544,5(6)&nbsp;keV
| 145Tb
| style="text-align:right" | 65
| style="text-align:right" | 80
| 144,92927(6)
| 20#&nbsp;mnt
| β+
| 145Gd
| (3/2+)
|
|
|-
| style="text-indent:1em" | 145mTb
| colspan="3" style="text-indent:2em" | 0(100)#&nbsp;keV
| 30,9(7)&nbsp;dtk
| β+
| 145Gd
| (11/2−)
|
|
|-
| 146Tb
| style="text-align:right" | 65
| style="text-align:right" | 81
| 145,92725(5)
| 8(4)&nbsp;dtk
| β+
| 146Gd
| 1+
|
|
|-
| style="text-indent:1em" | 146m1Tb
| colspan="3" style="text-indent:2em" | 150(100)#&nbsp;keV
| 24,1(5)&nbsp;dtk
| β+
| 146Gd
| 5−
|
|
|-
| style="text-indent:1em" | 146m2Tb
| colspan="3" style="text-indent:2em" | 930(100)#&nbsp;keV
| 1,18(2)&nbsp;mdtk
|
|
| (10+)
|
|
|-
| 147Tb
| style="text-align:right" | 65
| style="text-align:right" | 82
| 146,924045(13)
| 1,64(3)&nbsp;jam
| β+
| 147Gd
| 1/2+#
|
|
|-
| style="text-indent:1em" | 147mTb
| colspan="3" style="text-indent:2em" | 50,6(9)&nbsp;keV
| 1,87(5)&nbsp;mnt
| β+
| 147Gd
| (11/2)−
|
|
|-
| 148Tb
| style="text-align:right" | 65
| style="text-align:right" | 83
| 147,924272(15)
| 60(1)&nbsp;mnt
| β+
| 148Gd
| 2−
|
|
|-
| style="text-indent:1em" | 148m1Tb
| colspan="3" style="text-indent:2em" | 90,1(3)&nbsp;keV
| 2,20(5)&nbsp;mnt
| β+
| 148Gd
| (9)+
|
|
|-
| style="text-indent:1em" | 148m2Tb
| colspan="3" style="text-indent:2em" | 8618,6(10)&nbsp;keV
| 1,310(7) µdtk
|
|
| (27+)
|
|
|-
| rowspan=2|149Tb
| rowspan=2 style="text-align:right" | 65
| rowspan=2 style="text-align:right" | 84
| rowspan=2|148,923246(5)
| rowspan=2|4,118(25)&nbsp;jam
| β+ (83,3%)
| 149Gd
| rowspan=2|1/2+
| rowspan=2|
| rowspan=2|
|-
| α (16,7%)
| 145Eu
|-
| rowspan=2 style="text-indent:1em" | 149mTb
| rowspan=2 colspan="3" style="text-indent:2em" | 35,78(13)&nbsp;keV
| rowspan=2|4,16(4)&nbsp;mnt
| β+ (99,97%)
| 149Gd
| rowspan=2|11/2−
| rowspan=2|
| rowspan=2|
|-
| α (0,022%)
| 145Eu
|-
| rowspan=2|150Tb
| rowspan=2 style="text-align:right" | 65
| rowspan=2 style="text-align:right" | 85
| rowspan=2|149,923660(8)
| rowspan=2|3,48(16)&nbsp;jam
| β+ (99,95%)
| 150Gd
| rowspan=2|(2−)
| rowspan=2|
| rowspan=2|
|-
| α (0,05%)
| 146Eu
|-
| rowspan=2 style="text-indent:1em" | 150mTb
| rowspan=2 colspan="3" style="text-indent:2em" | 457(29)&nbsp;keV
| rowspan=2|5,8(2)&nbsp;mnt
| β+
| 150Gd
| rowspan=2|9+
| rowspan=2|
| rowspan=2|
|-
| IT (langka)
| 150Tb
|-
| rowspan=2|151Tb
| rowspan=2 style="text-align:right" | 65
| rowspan=2 style="text-align:right" | 86
| rowspan=2|150,923103(5)
| rowspan=2|17.609(1)&nbsp;jam
| β+ (99,99%)
| 151Gd
| rowspan=2|1/2(+)
| rowspan=2|
| rowspan=2|
|-
| α (0,0095%)
| 147Eu
|-
| rowspan=2 style="text-indent:1em" | 151mTb
| rowspan=2 colspan="3" style="text-indent:2em" | 99,54(6)&nbsp;keV
| rowspan=2|25(3)&nbsp;dtk
| IT (93,8%)
| 151Tb
| rowspan=2|(11/2−)
| rowspan=2|
| rowspan=2|
|-
| β+ (6,2%)
| 151Gd
|-
| rowspan=2|152Tb
| rowspan=2 style="text-align:right" | 65
| rowspan=2 style="text-align:right" | 87
| rowspan=2|151,92407(4)
| rowspan=2|17,5(1)&nbsp;jam
| β+
| ***<sup>152</sup>Gd***
| rowspan=2|2−
| rowspan=2|
| rowspan=2|
|-
| α (7%)
| 148Eu
|-
| style="text-indent:1em" | 152m1Tb
| colspan="3" style="text-indent:2em" | 342,15(16)&nbsp;keV
| 0,96 µdtk
|
|
| 5−
|
|
|-
| rowspan=2 style="text-indent:1em" | 152m2Tb
| rowspan=2 colspan="3" style="text-indent:2em" | 501,74(19)&nbsp;keV
| rowspan=2|4,2(1)&nbsp;mnt
| IT (78,8%)
| 152Tb
| rowspan=2|8+
| rowspan=2|
| rowspan=2|
|-
| β+ (21,2%)
| ***<sup>152</sup>Gd***
|-
| 153Tb
| style="text-align:right" | 65
| style="text-align:right" | 88
| 152,923435(5)
| 2,34(1)&nbsp;hri
| β+
| 153Gd
| 5/2+
|
|
|-
| style="text-indent:1em" | 153mTb
| colspan="3" style="text-indent:2em" | 163,175(5)&nbsp;keV
| 186(4) µdtk
|
|
| 11/2−
|
|
|-
| rowspan=2|154Tb
| rowspan=2 style="text-align:right" | 65
| rowspan=2 style="text-align:right" | 89
| rowspan=2|153,92468(5)
| rowspan=2|21,5(4)&nbsp;jam
| β+ (99,9%)
| **<sup>154</sup>Gd**
| rowspan=2|0(+#)
| rowspan=2|
| rowspan=2|
|-
| β− (0,1%)
| 154Dy
|-
| rowspan=3 style="text-indent:1em" | 154m1Tb
| rowspan=3 colspan="3" style="text-indent:2em" | 12(7)&nbsp;keV
| rowspan=3|9,4(4)&nbsp;jam
| β+ (78,2%)
| **<sup>154</sup>Gd**
| rowspan=3|3−
| rowspan=3|
| rowspan=3|
|-
| IT (21,8%)
| 154Tb
|-
| β− (0,1%)
| 154Dy
|-
| style="text-indent:1em" | 154m2Tb
| colspan="3" style="text-indent:2em" | 200(150)#&nbsp;keV
| 22,7(5)&nbsp;jam
|
|
| 7−
|
|
|-
| style="text-indent:1em" | 154m3Tb
| colspan="3" style="text-indent:2em" | 0+Z&nbsp;keV
| 513(42)&nbsp;ndtk
|
|
|
|
|
|-
| 155Tb
| style="text-align:right" | 65
| style="text-align:right" | 90
| 154,923505(13)
| 5,32(6)&nbsp;hri
| EC
| **<sup>155</sup>Gd**
| 3/2+
|
|
|-
| rowspan=2|156Tb
| rowspan=2 style="text-align:right" | 65
| rowspan=2 style="text-align:right" | 91
| rowspan=2|155,924747(5)
| rowspan=2|5,35(10)&nbsp;hri
| β+
| **<sup>156</sup>Gd**
| rowspan=2|3−
| rowspan=2|
| rowspan=2|
|-
| β− (langka)
| **<sup>156</sup>Dy**
|-
| style="text-indent:1em" | 156m1Tb
| colspan="3" style="text-indent:2em" | 54(3)&nbsp;keV
| 24,4(10)&nbsp;jam
| IT
| 156Tb
| (7−)
|
|
|-
| style="text-indent:1em" | 156m2Tb
| colspan="3" style="text-indent:2em" | 88,4(2)&nbsp;keV
| 5,3(2)&nbsp;jam
|
|
| (0+)
|
|
|-
| 157Tb
| style="text-align:right" | 65
| style="text-align:right" | 92
| 156,9240246(27)
| 71(7)&nbsp;thn
| EC
| **<sup>157</sup>Gd**
| 3/2+
|
|
|-
| rowspan=2|158Tb
| rowspan=2 style="text-align:right" | 65
| rowspan=2 style="text-align:right" | 93
| rowspan=2|157,9254131(28)
| rowspan=2|180(11)&nbsp;thn
| β+ (83,4%)
| **<sup>158</sup>Gd**
| rowspan=2|3−
| rowspan=2|
| rowspan=2|
|-
| β− (16,6%)
| **<sup>158</sup>Dy**
|-
| rowspan=3 style="text-indent:1em" | 158m1Tb
| rowspan=3 colspan="3" style="text-indent:2em" | 110,3(12)&nbsp;keV
| rowspan=3|10,70(17)&nbsp;dtk
| IT (99,39%)
| 158Tb
| rowspan=3|0−
| rowspan=3|
| rowspan=3|
|-
| β− (0,6%)
| **<sup>158</sup>Dy**
|-
| β+ (0,01%)
| **<sup>158</sup>Gd**
|-
| style="text-indent:1em" | 158m2Tb
| colspan="3" style="text-indent:2em" | 388,37(15)&nbsp;keV
| 0,40(4)&nbsp;mdtk
|
|
| 7−
|
|
|-
| 159Tb
| style="text-align:right" | 65
| style="text-align:right" | 94
| 158,9253468(27)
| colspan=3 align=center|**Stabil**
| 3/2+
| 1,0000
|
|-
| 160Tb
| style="text-align:right" | 65
| style="text-align:right" | 95
| 159,9271676(27)
| 72,3(2)&nbsp;hri
| β−
| **<sup>160</sup>Dy**
| 3−
|
|
|-
| 161Tb
| style="text-align:right" | 65
| style="text-align:right" | 96
| 160,9275699(28)
| 6,906(19)&nbsp;hri
| β−
| **<sup>161</sup>Dy**
| 3/2+
|
|
|-
| 162Tb
| style="text-align:right" | 65
| style="text-align:right" | 97
| 161,92949(4)
| 7,60(15)&nbsp;mnt
| β−
| **<sup>162</sup>Dy**
| 1−
|
|
|-
| 163Tb
| style="text-align:right" | 65
| style="text-align:right" | 98
| 162,930648(5)
| 19,5(3)&nbsp;mnt
| β−
| **<sup>163</sup>Dy**
| 3/2+
|
|
|-
| 164Tb
| style="text-align:right" | 65
| style="text-align:right" | 99
| 163,93335(11)
| 3,0(1)&nbsp;mnt
| β−
| **<sup>164</sup>Dy**
| (5+)
|
|
|-
| 165Tb
| style="text-align:right" | 65
| style="text-align:right" | 100
| 164,93488(21)#
| 2,11(10)&nbsp;mnt
| β−
| 165mDy
| 3/2+#
|
|
|-
| 166Tb
| style="text-align:right" | 65
| style="text-align:right" | 101
| 165,93799(11)
| 25,6(22)&nbsp;dtk
| β−
| 166Dy
|
|
|
|-
| 167Tb
| style="text-align:right" | 65
| style="text-align:right" | 102
| 166,94005(43)#
| 19,4(27)&nbsp;dtk
| β−
| 167Dy
| 3/2+#
|
|
|-
| 168Tb
| style="text-align:right" | 65
| style="text-align:right" | 103
| 167,94364(54)#
| 8,2(13)&nbsp;dtk
| β−
| 168Dy
| 4−#
|
|
|-
| 169Tb
| style="text-align:right" | 65
| style="text-align:right" | 104
| 168,94622(64)#
| 2# dtk
| β−
| 169Dy
| 3/2+#
|
|
|-
| 170Tb
| style="text-align:right" | 65
| style="text-align:right" | 105
| 169,95025(75)#
| 3# dtk
| β−
| 170Dy
|
|
|
|-
| 171Tb
| style="text-align:right" | 65
| style="text-align:right" | 106
| 170,95330(86)#
| 500#&nbsp;mdtk
| β−
| 171Dy
| 3/2+#
|
|

## Referensi

* Massa isotop dari:
**
* Komposisi isotop dan massa atom standar dari:
**
**
* Data waktu paruh, spin, dan isomer dipilih dari sumber-sumber berikut.
**
**
**