Isotopes of terbium: Difference between revisions
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{{Infobox terbium isotopes}} | {{Infobox terbium isotopes}} | ||
Naturally occurring [[terbium]] (<sub>65</sub>Tb) is composed of one stable [[isotope]], <sup>159</sup>Tb. Thirty-seven [[radioisotope]]s have been characterized, with the most stable being <sup>158</sup>Tb with a [[half-life]] of 180 years, <sup>157</sup>Tb with a half-life of 71 years, and <sup>160</sup>Tb with a half-life of 72.3 days. All of the remaining [[radioactive]] isotopes have half-lives that are less than 6.907 days, and the majority of these have half-lives that are less than 24 seconds. This element also has 27 [[meta state]]s, with the most stable being <sup> | Naturally occurring [[terbium]] (<sub>65</sub>Tb) is composed of one stable [[isotope]], <sup>159</sup>Tb. Thirty-seven [[radioisotope]]s have been characterized, with the most stable being <sup>158</sup>Tb with a [[half-life]] of 180 years, <sup>157</sup>Tb with a half-life of 71 years, and <sup>160</sup>Tb with a half-life of 72.3 days. All of the remaining [[radioactive]] isotopes have half-lives that are less than 6.907 days, and the majority of these have half-lives that are less than 24 seconds. This element also has 27 [[meta state]]s, with the most stable being <sup>156m2</sup>Tb (t<sub>1/2</sub> = 24.4 hours), <sup>154m2</sup>Tb (t<sub>1/2</sub> = 22.7 hours) and <sup>154m1</sup>Tb (t<sub>1/2</sub> = 21.5 hours). | ||
The primary [[decay mode]] before the most abundant stable isotope, <sup>159</sup>Tb, is [[electron capture]], and the primary mode behind is [[beta decay]]. The primary [[decay product]]s before <sup>159</sup>Tb are element Gd ([[gadolinium]]) isotopes, and the primary products after <sup>159</sup>Tb are element Dy ([[dysprosium]]) isotopes. | The primary [[decay mode]] before the most abundant stable isotope, <sup>159</sup>Tb, is [[electron capture]], and the primary mode behind is [[beta decay]]. The primary [[decay product]]s before <sup>159</sup>Tb are element Gd ([[gadolinium]]) isotopes, and the primary products after <sup>159</sup>Tb are element Dy ([[dysprosium]]) isotopes. | ||
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| rowspan=2| | | rowspan=2| | ||
|- | |- | ||
| α (.0095%) | | α (0.0095%) | ||
| <sup>147</sup>Eu | | <sup>147</sup>Eu | ||
|-id=Terbium-151m | |-id=Terbium-151m | ||
Latest revision as of 11:35, 23 June 2025
Template:Short description Template:Infobox terbium isotopes Naturally occurring terbium (65Tb) is composed of one stable isotope, 159Tb. Thirty-seven radioisotopes have been characterized, with the most stable being 158Tb with a half-life of 180 years, 157Tb with a half-life of 71 years, and 160Tb with a half-life of 72.3 days. All of the remaining radioactive isotopes have half-lives that are less than 6.907 days, and the majority of these have half-lives that are less than 24 seconds. This element also has 27 meta states, with the most stable being 156m2Tb (t1/2 = 24.4 hours), 154m2Tb (t1/2 = 22.7 hours) and 154m1Tb (t1/2 = 21.5 hours).
The primary decay mode before the most abundant stable isotope, 159Tb, is electron capture, and the primary mode behind is beta decay. The primary decay products before 159Tb are element Gd (gadolinium) isotopes, and the primary products after 159Tb are element Dy (dysprosium) isotopes.
List of isotopes
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Template:Isotopes table
|-id=Terbium-135
| 135Tb
| style="text-align:right" | 65
| style="text-align:right" | 70
| 134.96452(43)#
| 1.01(28) ms
| p
| 134Gd
| (7/2−)
|
|-id=Terbium-139
| 139Tb
| style="text-align:right" | 65
| style="text-align:right" | 74
| 138.94833(32)#
| 1.6(2) s
| β+
| 139Gd
| 5/2−#
|
|-id=Terbium-140
| rowspan=3|140Tb
| rowspan=3 style="text-align:right" | 65
| rowspan=3 style="text-align:right" | 75
| rowspan=3|139.94581(86)
| rowspan=3|2.29(15) s
| β+ (99.74%)
| 140Gd
| rowspan=3|(7+)
| rowspan=3|
|-
| EC (<3%)
| 140Gd
|-
| β+, p (0.26%)
| 139Eu
|-id=Terbium-141
| 141Tb
| style="text-align:right" | 65
| style="text-align:right" | 76
| 140.94145(11)
| 3.5(2) s
| β+
| 141Gd
| (5/2−)
|
|-id=Terbium-141m
| style="text-indent:1em" | 141mTb[n 1][n 2]
| colspan="3" style="text-indent:2em" | 0(200)# keV
| 7.9(6) s
| β+
| 141Gd
| 11/2−#
|
|-id=Terbium-142
| rowspan=3|142Tb
| rowspan=3 style="text-align:right" | 65
| rowspan=3 style="text-align:right" | 77
| rowspan=3|141.93928(75)
| rowspan=3|597(17) ms
| β+ (96.8%)
| 142Gd
| rowspan=3|1+
| rowspan=3|
|-
| EC (3.2%)
| 142Gd
|-
| β+, p (0.0022%)
| 141Eu
|-id=Terbium-142m1
| style="text-indent:1em" | 142m1Tb
| colspan="3" style="text-indent:2em" | 279.7(4) keV
| 303(17) ms
| IT
| 142Tb
| 5−
|
|-id=Terbium-142m2
| style="text-indent:1em" | 142m2Tb
| colspan="3" style="text-indent:2em" | 652.1(6) keV
| 26(1) μs
| IT
| 142Tb
| 8+
|
|-id=Terbium-143
| 143Tb
| style="text-align:right" | 65
| style="text-align:right" | 78
| 142.935137(55)
| 12(1) s
| β+
| 143Gd
| (11/2−)
|
|-id=Terbium-143m
| style="text-indent:1em" | 143mTb[n 1]
| colspan="3" style="text-indent:2em" | 0(100)# keV
| 17(4) s
|
|
| 5/2+#
|
|-id=Terbium-144
| 144Tb
| style="text-align:right" | 65
| style="text-align:right" | 79
| 143.933045(30)
| ~1 s
| β+
| 144Gd
| 1+
|
|-id=Terbium-144m1
| rowspan=2 style="text-indent:1em" | 144m1Tb
| rowspan=2 colspan="3" style="text-indent:2em" | 396.9(5) keV
| rowspan=2|4.25(15) s
| IT (66%)
| 144Tb
| rowspan=2|6−
| rowspan=2|
|-
| β+ (34%)
| 144Gd
|-id=Terbium-144m2
| style="text-indent:1em" | 144m2Tb
| colspan="3" style="text-indent:2em" | 476.2(5) keV
| 2.8(3) μs
| IT
| 144Tb
| (8−)
|
|-id=Terbium-144m3
| style="text-indent:1em" | 144m3Tb
| colspan="3" style="text-indent:2em" | 517.1(5) keV
| 670(60) ns
| IT
| 144Tb
| (9+)
|
|-id=Terbium-144m4
| style="text-indent:1em" | 144m4Tb
| colspan="3" style="text-indent:2em" | 544.5(6) keV
| <300 ns
| IT
| 144Tb
| (10+)
|
|-id=Terbium-145
| 145Tb
| style="text-align:right" | 65
| style="text-align:right" | 80
| 144.92872(12)
| 30.9(6) s
| β+
| 145Gd
| (11/2−)
|
|-id=Terbium-145m
| style="text-indent:1em" | 145mTb[n 1]
| colspan="3" style="text-indent:2em" | 860(230) keV
|
|
|
| (3/2+)
|
|-id=Terbium-146
| 146Tb
| style="text-align:right" | 65
| style="text-align:right" | 81
| 145.927253(48)
| 8(4) s
| β+
| 146Gd
| 1+
|
|-id=Terbium-146m1
| style="text-indent:1em" | 146m1Tb[n 1]
| colspan="3" style="text-indent:2em" | 150(100)# keV
| 24.1(5) s
| β+
| 146Gd
| 5−
|
|-id=Terbium-146m2
| style="text-indent:1em" | 146m2Tb
| colspan="3" style="text-indent:2em" | 930(100)# keV
| 1.18(2) ms
| IT
| 146Tb
| 10+
|
|-id=Terbium-147
| 147Tb
| style="text-align:right" | 65
| style="text-align:right" | 82
| 146.9240546(87)
| 1.64(3) h
| β+
| 147Gd
| (1/2+)
|
|-id=Terbium-147m
| style="text-indent:1em" | 147mTb
| colspan="3" style="text-indent:2em" | 50.6(9) keV
| 1.87(5) min
| β+
| 147Gd
| (11/2−)
|
|-id=Terbium-148
| 148Tb
| style="text-align:right" | 65
| style="text-align:right" | 83
| 147.924275(13)
| 60(1) min
| β+
| 148Gd
| 2−
|
|-id=Terbium-148m1
| style="text-indent:1em" | 148m1Tb
| colspan="3" style="text-indent:2em" | 90.1(3) keV
| 2.20(5) min
| β+
| 148Gd
| (9)+
|
|-id=Terbium-148m2
| style="text-indent:1em" | 148m2Tb
| colspan="3" style="text-indent:2em" | 8618.6(10) keV
| 1.310(7) μs
| IT
| 148Tb
| (27+)
|
|-id=Terbium-149
| rowspan=2|149Tb
| rowspan=2 style="text-align:right" | 65
| rowspan=2 style="text-align:right" | 84
| rowspan=2|148.9232538(39)
| rowspan=2|4.118(25) h
| β+ (83.3%)
| 149Gd
| rowspan=2|1/2+
| rowspan=2|
|-
| α (16.7%)
| 145Eu
|-id=Terbium-149m
| rowspan=2 style="text-indent:1em" | 149mTb
| rowspan=2 colspan="3" style="text-indent:2em" | 35.78(13) keV
| rowspan=2|4.16(4) min
| β+ (99.98%)
| 149Gd
| rowspan=2|11/2−
| rowspan=2|
|-
| α (0.022%)
| 145Eu
|-id=Terbium-150
| 150Tb
| style="text-align:right" | 65
| style="text-align:right" | 85
| 149.9236648(79)
| 3.48(16) h
| β+
| 150Gd
| (2)−
|
|-id=Terbium-150m
| style="text-indent:1em" | 150mTb
| colspan="3" style="text-indent:2em" | 461(27) keV
| 5.8(2) min
| β+
| 150Gd
| 9+
|
|-id=Terbium-151
| rowspan=2|151Tb
| rowspan=2 style="text-align:right" | 65
| rowspan=2 style="text-align:right" | 86
| rowspan=2|150.9231090(44)
| rowspan=2|17.609(1) h
| β+ (99.99%)
| 151Gd
| rowspan=2|1/2+
| rowspan=2|
|-
| α (0.0095%)
| 147Eu
|-id=Terbium-151m
| rowspan=2 style="text-indent:1em" | 151mTb
| rowspan=2 colspan="3" style="text-indent:2em" | 99.53(5) keV
| rowspan=2|25(3) s
| IT (93.4%)
| 151Tb
| rowspan=2|11/2−
| rowspan=2|
|-
| β+ (6.6%)
| 151Gd
|-id=Terbium-152
| rowspan=3|152Tb
| rowspan=3 style="text-align:right" | 65
| rowspan=3 style="text-align:right" | 87
| rowspan=3|151.924082(43)
| rowspan=3|17.8784(95) h[1]
| EC (83%)[1]
| rowspan=2|152Gd
| rowspan=3|2−
| rowspan=3|
|-
| β+ (17%)[1]
|-
| α (<7×10−7%)[2]
| 148Eu
|-id=Terbium-152m1
| style="text-indent:1em" | 152m1Tb
| colspan="3" style="text-indent:2em" | 342.15(16) keV
| 960(10) ns
| IT
| 152Tb
| 5−
|
|-id=Terbium-152m2
| rowspan=2 style="text-indent:1em" | 152m2Tb
| rowspan=2 colspan="3" style="text-indent:2em" | 501.74(19) keV
| rowspan=2|4.2(1) min
| IT (78.9%)
| 152Tb
| rowspan=2|8+
| rowspan=2|
|-
| β+ (21.1%)
| 152Gd
|-id=Terbium-153
| 153Tb
| style="text-align:right" | 65
| style="text-align:right" | 88
| 152.9234417(42)
| 2.34(1) d
| β+
| 153Gd
| 5/2+
|
|-id=Terbium-153m
| style="text-indent:1em" | 153mTb
| colspan="3" style="text-indent:2em" | 163.175(5) keV
| 186(4) μs
| IT
| 153Tb
| 11/2−
|
|-id=Terbium-154
| 154Tb
| style="text-align:right" | 65
| style="text-align:right" | 89
| 153.924684(49)
| 9.994(39) h
| β+
| 154Gd
| 3−
|
|-id=Terbium-154m1
| style="text-indent:1em" | 154m1Tb[n 1]
| colspan="3" style="text-indent:2em" | 130(50)# keV
| 21.5(4) h
| β+
| 154Gd
| 0−
|
|-id=Terbium-154m2
| style="text-indent:1em" | 154m2Tb[n 1]
| colspan="3" style="text-indent:2em" | 200(150)# keV
| 22.7(5) h
| β+
| 154Gd
| 7−
|
|-id=Terbium-154m3
| style="text-indent:1em" | 154m3Tb
| colspan="3" style="text-indent:2em" | 405(150)# keV
| 513(42) ns
| IT
| 154Tb
|
|
|-id=Terbium-155
| 155Tb
| style="text-align:right" | 65
| style="text-align:right" | 90
| 154.923510(11)
| 5.32(6) d
| EC
| 155Gd
| 3/2+
|
|-id=Terbium-156
| 156Tb
| style="text-align:right" | 65
| style="text-align:right" | 91
| 155.9247542(40)
| 5.35(10) d
| β+
| 156Gd
| 3−
|
|-id=Terbium-156m1
| style="text-indent:1em" | 156m1Tb
| colspan="3" style="text-indent:2em" | 88.4(2) keV
| 5.3(2) h
| IT
| 156Tb
| (0+)
|
|-id=Terbium-156m2
| style="text-indent:1em" | 156m2Tb
| colspan="3" style="text-indent:2em" | 100(50)# keV
| 24.4(10) h
| IT
| 156Tb
| (7−)
|
|-id=Terbium-157
| 157Tb
| style="text-align:right" | 65
| style="text-align:right" | 92
| 156.9240319(11)
| 71(7) y
| EC
| 157Gd
| 3/2+
|
|-id=Terbium-158
| rowspan=2|158Tb
| rowspan=2 style="text-align:right" | 65
| rowspan=2 style="text-align:right" | 93
| rowspan=2|157.9254199(14)
| rowspan=2|180(11) y
| β+ (83.4%)
| 158Gd
| rowspan=2|3−
| rowspan=2|
|-
| β− (16.6%)
| 158Dy
|-id=Terbium-158m1
| style="text-indent:1em" | 158m1Tb
| colspan="3" style="text-indent:2em" | 110.3(12) keV
| 10.70(17) s
| IT
| 158Tb
| 0−
|
|-id=Terbium-158m2
| style="text-indent:1em" | 158m2Tb
| colspan="3" style="text-indent:2em" | 388.39(11) keV
| 0.40(4) ms
| IT
| 158Tb
| 7−
|
|-id=Terbium-159
| 159Tb[n 3]
| style="text-align:right" | 65
| style="text-align:right" | 94
| 158.9253537(12)
| colspan=3 align=center|Stable
| 3/2+
| 1.0000
|-id=Terbium-160
| 160Tb
| style="text-align:right" | 65
| style="text-align:right" | 95
| 159.9271746(12)
| 72.3(2) d
| β−
| 160Dy
| 3−
|
|-id=Terbium-161
| 161Tb[n 3]
| style="text-align:right" | 65
| style="text-align:right" | 96
| 160.9275768(13)
| 6.948(5) d
| β−
| 161Dy
| 3/2+
|
|-id=Terbium-162
| 162Tb
| style="text-align:right" | 65
| style="text-align:right" | 97
| 161.9292754(22)
| 7.60(15) min
| β−
| 162Dy
| (1−)
|
|-id=Terbium-162m
| style="text-indent:1em" | 162mTb
| colspan="3" style="text-indent:2em" | 286(3) keV
| 10# min
|
|
| 4−#
|
|-id=Terbium-163
| 163Tb
| style="text-align:right" | 65
| style="text-align:right" | 98
| 162.9306536(44)
| 19.5(3) min
| β−
| 163Dy
| 3/2+
|
|-id=Terbium-164
| 164Tb
| style="text-align:right" | 65
| style="text-align:right" | 99
| 163.9333276(20)
| 3.0(1) min
| β−
| 164Dy
| (5+)
|
|-id=Terbium-164m
| style="text-indent:1em" | 164mTb
| colspan="3" style="text-indent:2em" | 145(12) keV
| 2# min
|
|
| 2+#
|
|-id=Terbium-165
| 165Tb
| style="text-align:right" | 65
| style="text-align:right" | 100
| 164.9349552(17)
| 2.11(10) min
| β−
| 165Dy
| (3/2+)
|
|-id=Terbium-165m
| style="text-indent:1em" | 165mTb
| colspan="3" style="text-indent:2em" | 207(5) keV
| 0.81(8) μs
| IT
| 165Tb
| (7/2−)
|
|-id=Terbium-166
| 166Tb
| style="text-align:right" | 65
| style="text-align:right" | 101
| 165.9379397(16)
| 27.1(15) s
| β−
| 166Dy
| (1−)
|
|-id=Terbium-166m
| style="text-indent:1em" | 166mTb
| colspan="3" style="text-indent:2em" | 159.0(15) keV
| 3.5(4) μs
| IT
| 166Tb
| 4−#
|
|-id=Terbium-167
| 167Tb
| style="text-align:right" | 65
| style="text-align:right" | 102
| 166.9400070(21)
| 18.9(16) s
| β−
| 167Dy
| (3/2+)
|
|-id=Terbium-167m
| style="text-indent:1em" | 167mTb
| colspan="3" style="text-indent:2em" | 200(6) keV
| 1.2(1) μs
| IT
| 167Tb
| (7/2−)
|
|-id=Terbium-168
| 168Tb
| style="text-align:right" | 65
| style="text-align:right" | 103
| 167.9433371(45)
| 9.4(4) s
| β−
| 168Dy
| (4−)
|
|-id=Terbium-168m
| style="text-indent:1em" | 168mTb
| colspan="3" style="text-indent:2em" | 211(1) keV
| 0.71(3) μs
| IT
| 168Tb
| (6+)
|
|-id=Terbium-169
| 169Tb
| style="text-align:right" | 65
| style="text-align:right" | 104
| 168.94581(32)#
| 5.13(32) s
| β−
| 169Dy
| 3/2+#
|
|-id=Terbium-170
| 170Tb
| style="text-align:right" | 65
| style="text-align:right" | 105
| 169.94986(32)#
| 960(78) ms
| β−
| 170Dy
| 2−#
|
|-id=Terbium-171
| 171Tb
| style="text-align:right" | 65
| style="text-align:right" | 106
| 170.95301(43)#
| 1.23(10) s
| β−
| 171Dy
| 3/2+#
|
|-id=Terbium-172
| 172Tb
| style="text-align:right" | 65
| style="text-align:right" | 107
| 171.95739(54)#
| 760(190) ms
| β−
| 172Dy
| 6+#
|
|-id=Terbium-173
| 173Tb
| style="text-align:right" | 65
| style="text-align:right" | 108
| 172.96081(54)#
| 400# ms
[>550 ns]
|
|
| 3/2+#
|
|-id=Terbium-174
| 174Tb
| style="text-align:right" | 65
| style="text-align:right" | 109
| 173.96568(54)#
| 240# ms
[>550 ns]
|
|
| 2−#
|
Template:Isotopes table/footer
See also
Daughter products other than terbium
References
- Isotope masses from:
- Isotopic compositions and standard atomic masses from:
- Half-life, spin, and isomer data selected from the following sources.
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