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:Isotopes of terbium

{{Short description|none}}

{{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 156m1Tb (t1/2 = 24.4 hours), 154m2Tb (t1/2 = 22.7 hours) and 154m1Tb (t1/2 = 9.4 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

{{Anchor|Terbium-136|Terbium-137|Terbium-138}}

{{Isotopes table

|symbol=Tb

|refs=NUBASE2020, AME2020 II

|notes=m, unc(), mass#, hl#, exen#, spin(), spin#, daughter-st, daughter-nst, EC, IT, p

}}

|-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" | 141mTbOrder of ground state and isomer is uncertain.Discovery of this isotope is disputed.

| 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

| 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

| 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

| 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 (.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{{cite journal | last1=Collins | first1=S.M. | last2=Köster | first2=U. | last3=Robinson | first3=A.P. | last4=Ivanov | first4=P. | last5=Cocolios | first5=T.E. | last6=Russell | first6=B. | last7=Fenwick | first7=A.J. | last8=Bernerd | first8=C. | last9=Stegemann | first9=S. | last10=Johnston | first10=K. | last11=Gerami | first11=A.M. | last12=Chrysalidis | first12=K. | last13=Mohamud | first13=H. | last14=Ramirez | first14=N. | last15=Bhaisare | first15=A. | last16=Mewburn-Crook | first16=J. | last17=Cullen | first17=D.M. | last18=Pietras | first18=B. | last19=Pells | first19=S. | last20=Dockx | first20=K. | last21=Stucki | first21=N. | last22=Regan | first22=P.H. | title=Determination of the Terbium-152 half-life from mass-separated samples from CERN-ISOLDE and assessment of the radionuclide purity | journal=Applied Radiation and Isotopes | publisher=Elsevier BV | volume=202 | year=2023 | issn=0969-8043 | doi=10.1016/j.apradiso.2023.111044 | page=111044| pmid=37797447 | doi-access=free }}

| EC (83%)

| rowspan=2|152Gd

| rowspan=3|2−

| rowspan=3|

|-

| β+ (17%)

|-

| α (<7×10−7%){{cite web|url=https://www.nndc.bnl.gov/nudat3/getdataset.jsp?nucleus=152Tb&unc=NDS|title=Adopted Levels for 152Tb|publisher=NNDC Chart of Nuclides}}

| 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

| colspan="3" style="text-indent:2em" | 130(50)# keV

| 21.5(4) h

| β+

| 154Gd

| 0−

|

|-id=Terbium-154m2

| style="text-indent:1em" | 154m2Tb

| 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

| 159TbFission product

| 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

| 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−#

|

{{Isotopes table/footer}}

References

{{Reflist}}

  • Isotope masses from:
  • {{NUBASE 2003}}
  • Isotopic compositions and standard atomic masses from:
  • {{CIAAW2003}}
  • {{CIAAW 2005}}
  • Half-life, spin, and isomer data selected from the following sources.
  • {{NUBASE 2003}}
  • {{NNDC}}
  • {{CRC85|chapter=11}}

{{Navbox element isotopes}}

Category:Terbium

Terbium