Isotopes of terbium

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Isotopes of terbium  (65Tb)
Main isotopes [1] Decay
abun­dance half-life (t1/2) mode pro­duct
157Tb synth 71 y ε 157Gd
158Tbsynth180 yε 158Gd
β 158Dy
159Tb100% stable
160Tb synth 72.3 dβ 160Dy
161Tb synth 6.948 dβ 161Dy
Standard atomic weight Ar°(Tb)

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 one week, 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).

Contents

The primary decay mode before the most abundant stable isotope, 159Tb, is electron capture to gadolinium isotopes, and the primary mode after is beta decay to dysprosium isotopes.

List of isotopes


Nuclide
[n 1]
Z N Isotopic mass (Da) [4]
[n 2] [n 3]
Half-life [1]
[n 4]
Decay
mode
[1]
[n 5]
Daughter
isotope

[n 6] [n 7]
Spin and
parity [1]
[n 8] [n 4]
Isotopic
abundance
Excitation energy [n 4]
135Tb6570134.96452(43)#1.01(28) ms p 134Gd(7/2−)
139Tb6574138.94833(32)#1.6(2) s β+ 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−)
141mTb [n 9] [n 10] 0(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) ms IT 142Tb5−
142m2Tb652.1(6) keV26(1) μsIT142Tb8+
143Tb6578142.935137(55)12(1) sβ+143Gd(11/2−)
143mTb [n 9] 0(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−)
145mTb [n 9] 860(230) keV(3/2+)
146Tb6581145.927253(48)8(4) sβ+146Gd1+
146m1Tb [n 9] 150(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 (0.0095%)147Eu
151mTb99.53(5) keV25(3) sIT (93.4%)151Tb11/2−
β+ (6.6%)151Gd
152Tb6587151.924082(43)17.8784(95) h [5] EC (83%) [5] 152Gd2−
β+ (17%) [5]
α (<7×10−7%) [6] 148Eu
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−
154m1Tb [n 9] 130(50)# keV21.5(4) hβ+154Gd0−
154m2Tb [n 9] 200(150)# keV22.7(5) hβ+154Gd7−
154m3Tb405(150)# keV513(42) nsIT154Tb
155Tb6590154.923510(11)5.2346(36) d [7] EC155Gd3/2+
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−
159Tb [n 11] 6594158.9253537(12)Stable3/2+1.0000
160Tb6595159.9271746(12)72.3(2) dβ160Dy3−
161Tb [n 11] 6596160.9275768(13)6.948(5) dβ161Dy3/2+
162Tb6597161.9292754(22)7.60(15) minβ162Dy(1−)
162mTb286(3) keV10# min4−#
163Tb6598162.9306536(44)19.5(3) minβ163Dy3/2+
164Tb6599163.9333276(20)3.0(1) minβ164Dy(5+)
164mTb145(12) keV2# min2+#
165Tb65100164.9349552(17)2.11(10) minβ165Dy(3/2+)
165mTb207(5) keV0.81(8) μsIT165Tb(7/2−)
166Tb65101165.9379397(16)27.1(15) sβ166Dy(1−)
166mTb159.0(15) keV3.5(4) μsIT166Tb4−#
167Tb65102166.9400070(21)18.9(16) sβ167Dy(3/2+)
167mTb200(6) keV1.2(1) μsIT167Tb(7/2−)
168Tb65103167.9433371(45)9.4(4) sβ168Dy(4−)
168mTb211(1) keV0.71(3) μsIT168Tb(6+)
169Tb65104168.94581(32)#5.13(32) sβ169Dy3/2+#
170Tb65105169.94986(32)#960(78) msβ170Dy2−#
171Tb65106170.95301(43)#1.23(10) sβ171Dy3/2+#
172Tb65107171.95739(54)#760(190) msβ172Dy6+#
173Tb65108172.96081(54)#400# ms
[>550 ns]
3/2+#
174Tb65109173.96568(54)#240# ms
[>550 ns]
2−#
This table header & footer:
  1. mTb  Excited nuclear isomer.
  2. ()  Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
  3. #  Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
  4. 1 2 3 #  Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
  5. Modes of decay:
    EC: Electron capture
    IT: Isomeric transition
    p: Proton emission
  6. Bold italics symbol as daughter  Daughter product is nearly stable.
  7. Bold symbol as daughter  Daughter product is stable.
  8. () spin value  Indicates spin with weak assignment arguments.
  9. 1 2 3 4 5 6 Order of ground state and isomer is uncertain.
  10. Discovery of this isotope is disputed.
  11. 1 2 Fission product

See also

Daughter products other than terbium

References

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  2. "Standard Atomic Weights: Terbium". CIAAW. 2021.
  3. Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN   1365-3075.
  4. 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.
  5. 1 2 3 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.
  6. "Adopted Levels for 152Tb". NNDC Chart of Nuclides.
  7. Half-life determination of 155Tb from mass-separated samples produced at CERN-MEDICIS