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Isotopes of terbium

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.

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List of isotopes

Nuclide1ZNIsotopic mass (Da)234Half-life56Decaymode78Daughterisotope910Spin andparity111213Isotopicabundance
Excitation energy14
135Tb6570134.96452(43)#1.01(28) msp134Gd(7/2−)
139Tb6574138.94833(32)#1.6(2) sβ+139Gd5/2−#
140Tb6575139.94581(86)2.29(15) sβ+ (99.74%)140Gd(7+)
EC (<3%)140Gd
β+, p (0.26%)139Eu
141Tb6576140.94145(11)3.5(2) sβ+141Gd(5/2−)
141mTb15160(200)# keV7.9(6) sβ+141Gd11/2−#
142Tb6577141.93928(75)597(17) msβ+ (96.8%)142Gd1+
EC (3.2%)142Gd
β+, p (0.0022%)141Eu
142m1Tb279.7(4) keV303(17) msIT142Tb5−
142m2Tb652.1(6) keV26(1) μsIT142Tb8+
143Tb6578142.935137(55)12(1) sβ+143Gd(11/2−)
143mTb170(100)# keV17(4) s5/2+#
144Tb6579143.933045(30)~1 sβ+144Gd1+
144m1Tb396.9(5) keV4.25(15) sIT (66%)144Tb6−
β+ (34%)144Gd
144m2Tb476.2(5) keV2.8(3) μsIT144Tb(8−)
144m3Tb517.1(5) keV670(60) nsIT144Tb(9+)
144m4Tb544.5(6) keV<300 nsIT144Tb(10+)
145Tb6580144.92872(12)30.9(6) sβ+145Gd(11/2−)
145mTb18860(230) keV(3/2+)
146Tb6581145.927253(48)8(4) sβ+146Gd1+
146m1Tb19150(100)# keV24.1(5) sβ+146Gd5−
146m2Tb930(100)# keV1.18(2) msIT146Tb10+
147Tb6582146.9240546(87)1.64(3) hβ+147Gd(1/2+)
147mTb50.6(9) keV1.87(5) minβ+147Gd(11/2−)
148Tb6583147.924275(13)60(1) minβ+148Gd2−
148m1Tb90.1(3) keV2.20(5) minβ+148Gd(9)+
148m2Tb8618.6(10) keV1.310(7) μsIT148Tb(27+)
149Tb6584148.9232538(39)4.118(25) hβ+ (83.3%)149Gd1/2+
α (16.7%)145Eu
149mTb35.78(13) keV4.16(4) minβ+ (99.98%)149Gd11/2−
α (0.022%)145Eu
150Tb6585149.9236648(79)3.48(16) hβ+150Gd(2)−
150mTb461(27) keV5.8(2) minβ+150Gd9+
151Tb6586150.9231090(44)17.609(1) hβ+ (99.99%)151Gd1/2+
α (.0095%)147Eu
151mTb99.53(5) keV25(3) sIT (93.4%)151Tb11/2−
β+ (6.6%)151Gd
152Tb6587151.924082(43)17.8784(95) h20EC (83%)21152Gd2−
β+ (17%)22
α (<7×10−7%)23148Eu
152m1Tb342.15(16) keV960(10) nsIT152Tb5−
152m2Tb501.74(19) keV4.2(1) minIT (78.9%)152Tb8+
β+ (21.1%)152Gd
153Tb6588152.9234417(42)2.34(1) dβ+153Gd5/2+
153mTb163.175(5) keV186(4) μsIT153Tb11/2−
154Tb6589153.924684(49)9.994(39) hβ+154Gd3−
154m1Tb24130(50)# keV21.5(4) hβ+154Gd0−
154m2Tb25200(150)# keV22.7(5) hβ+154Gd7−
154m3Tb405(150)# keV513(42) nsIT154Tb
155Tb6590154.923510(11)5.32(6) dEC155Gd3/2+
156Tb6591155.9247542(40)5.35(10) dβ+156Gd3−
156m1Tb88.4(2) keV5.3(2) hIT156Tb(0+)
156m2Tb100(50)# keV24.4(10) hIT156Tb(7−)
157Tb6592156.9240319(11)71(7) yEC157Gd3/2+
158Tb6593157.9254199(14)180(11) yβ+ (83.4%)158Gd3−
β− (16.6%)158Dy
158m1Tb110.3(12) keV10.70(17) sIT158Tb0−
158m2Tb388.39(11) keV0.40(4) msIT158Tb7−
159Tb266594158.9253537(12)Stable3/2+1.0000
160Tb6595159.9271746(12)72.3(2) dβ−160Dy3−
161Tb276596160.9275768(13)6.948(5) dβ−161Dy3/2+
162Tb6597161.9292754(22)7.60(15) minβ−162Dy(1−)
162mTb286(3) keV10# min4−#
163Tb6598162.9306536(44)19.5(3) minβ−163Dy3/2+
164Tb6599163.9333276(20)3.0(1) minβ−164Dy(5+)
164mTb145(12) keV2# min2+#
165Tb65100164.9349552(17)2.11(10) minβ−165Dy(3/2+)
165mTb207(5) keV0.81(8) μsIT165Tb(7/2−)
166Tb65101165.9379397(16)27.1(15) sβ−166Dy(1−)
166mTb159.0(15) keV3.5(4) μsIT166Tb4−#
167Tb65102166.9400070(21)18.9(16) sβ−167Dy(3/2+)
167mTb200(6) keV1.2(1) μsIT167Tb(7/2−)
168Tb65103167.9433371(45)9.4(4) sβ−168Dy(4−)
168mTb211(1) keV0.71(3) μsIT168Tb(6+)
169Tb65104168.94581(32)#5.13(32) sβ−169Dy3/2+#
170Tb65105169.94986(32)#960(78) msβ−170Dy2−#
171Tb65106170.95301(43)#1.23(10) sβ−171Dy3/2+#
172Tb65107171.95739(54)#760(190) msβ−172Dy6+#
173Tb65108172.96081(54)#400# ms[>550 ns]3/2+#
174Tb65109173.96568(54)#240# ms[>550 ns]2−#
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References

  1. mTb – Excited nuclear isomer. /wiki/Nuclear_isomer

  2. Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf. /wiki/Doi_(identifier)

  3. ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.

  4. # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).

  5. Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae. https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf

  6. # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

  7. Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae. https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf

  8. Modes of decay: EC:Electron captureIT:Isomeric transitionp:Proton emission /wiki/Electron_capture

  9. Bold italics symbol as daughter – Daughter product is nearly stable.

  10. Bold symbol as daughter – Daughter product is stable.

  11. Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae. https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf

  12. ( ) spin value – Indicates spin with weak assignment arguments.

  13. # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

  14. # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

  15. Order of ground state and isomer is uncertain.

  16. Discovery of this isotope is disputed.

  17. Order of ground state and isomer is uncertain.

  18. Order of ground state and isomer is uncertain.

  19. Order of ground state and isomer is uncertain.

  20. Collins, S.M.; Köster, U.; Robinson, A.P.; Ivanov, P.; Cocolios, T.E.; Russell, B.; Fenwick, A.J.; Bernerd, C.; Stegemann, S.; Johnston, K.; Gerami, A.M.; Chrysalidis, K.; Mohamud, H.; Ramirez, N.; Bhaisare, A.; Mewburn-Crook, J.; Cullen, D.M.; Pietras, B.; Pells, S.; Dockx, K.; Stucki, N.; Regan, P.H. (2023). "Determination of the Terbium-152 half-life from mass-separated samples from CERN-ISOLDE and assessment of the radionuclide purity". Applied Radiation and Isotopes. 202. Elsevier BV: 111044. doi:10.1016/j.apradiso.2023.111044. ISSN 0969-8043. PMID 37797447. https://doi.org/10.1016%2Fj.apradiso.2023.111044

  21. Collins, S.M.; Köster, U.; Robinson, A.P.; Ivanov, P.; Cocolios, T.E.; Russell, B.; Fenwick, A.J.; Bernerd, C.; Stegemann, S.; Johnston, K.; Gerami, A.M.; Chrysalidis, K.; Mohamud, H.; Ramirez, N.; Bhaisare, A.; Mewburn-Crook, J.; Cullen, D.M.; Pietras, B.; Pells, S.; Dockx, K.; Stucki, N.; Regan, P.H. (2023). "Determination of the Terbium-152 half-life from mass-separated samples from CERN-ISOLDE and assessment of the radionuclide purity". Applied Radiation and Isotopes. 202. Elsevier BV: 111044. doi:10.1016/j.apradiso.2023.111044. ISSN 0969-8043. PMID 37797447. https://doi.org/10.1016%2Fj.apradiso.2023.111044

  22. Collins, S.M.; Köster, U.; Robinson, A.P.; Ivanov, P.; Cocolios, T.E.; Russell, B.; Fenwick, A.J.; Bernerd, C.; Stegemann, S.; Johnston, K.; Gerami, A.M.; Chrysalidis, K.; Mohamud, H.; Ramirez, N.; Bhaisare, A.; Mewburn-Crook, J.; Cullen, D.M.; Pietras, B.; Pells, S.; Dockx, K.; Stucki, N.; Regan, P.H. (2023). "Determination of the Terbium-152 half-life from mass-separated samples from CERN-ISOLDE and assessment of the radionuclide purity". Applied Radiation and Isotopes. 202. Elsevier BV: 111044. doi:10.1016/j.apradiso.2023.111044. ISSN 0969-8043. PMID 37797447. https://doi.org/10.1016%2Fj.apradiso.2023.111044

  23. "Adopted Levels for 152Tb". NNDC Chart of Nuclides. https://www.nndc.bnl.gov/nudat3/getdataset.jsp?nucleus=152Tb&unc=NDS

  24. Order of ground state and isomer is uncertain.

  25. Order of ground state and isomer is uncertain.

  26. Fission product /wiki/Fission_product

  27. Fission product /wiki/Fission_product