Isotopes of terbium

Short description: Nuclides with atomic number of 65 but with different mass numbers

Main isotopes of Chemistry:terbium (65Tb) | Iso­tope | Decay

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| abun­dance | half-life (t1/2) | mode | pro­duct
157Tb  | syn | 71 y | ε | 157Gd
158Tb  | syn  | 180 y | ε  | 158Gd
β− | 158Dy
159Tb  | 100%  | stable
Standard atomic weight Ar, standard(Tb)|

* 158.92535(2)[1]

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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

Template:Anchor (or Anchors): too many anchors, maximum is ten

Nuclide
[n 1] | Z | N | Isotopic mass (u)
[n 2][n 3] | Half-life
[n 4] | Decay
mode
[n 5] | Daughter
isotope
[n 6][n 7] | Spin and
parity
[n 8][n 4] | Physics:Natural abundance (mole fraction)

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Excitation energy[n 4] | Normal proportion  | Range of variation
135Tb  | 65  | 70  |  | 0.94(+33−22) ms  |  |  | (7/2−)  |  |
136Tb  | 65  | 71  | 135.96138(64)#  | 0.2# s  |  |  |  |  |
137Tb  | 65  | 72  | 136.95598(64)#  | 600# ms  |  |  | 11/2−#  |  |
138Tb  | 65  | 73  | 137.95316(43)#  | 800# ms [>200 ns]  | β+ | 138Gd  |  |  |
p | 137Gd
139Tb  | 65  | 74  | 138.94829(32)#  | 1.6(2) s  | β+ | 139Gd  | 11/2−#  |  |
140Tb  | 65  | 75  | 139.94581(86)  | 2.4(2) s  | β+ (99.74%)  | 140Gd  | 5  |  |
β+, p (.26%)  | 139Eu
141Tb  | 65  | 76  | 140.94145(11)  | 3.5(2) s  | β+ | 141Gd  | (5/2−)  |  |
141mTb  | 0(200)# keV  | 7.9(6) s  | β+ | 141Gd  | 11/2−#  |  |
142Tb  | 65  | 77  | 141.93874(32)#  | 597(17) ms  | β+ (96.8(4)%)  | 142Gd  | 1+  |  |
EC (3.2(4)%)
β+, p  | 141Eu
142m1Tb  | 280.2(10) keV  | 303(17) ms  | IT (99.5%)  | 142Tb  | (5−)  |  |
β+ (.5%)  | 142Gd
142m2Tb  | 621.4(11) keV  | 15(4) µs  |  |  |  |  |
143Tb  | 65  | 78  | 142.93512(6)  | 12(1) s  | β+ | 143Gd  | (11/2−)  |  |
143mTb  | 0(100)# keV  | <21 s  | β+ | 143Gd  | 5/2+#  |  |
144Tb  | 65  | 79  | 143.93305(3)  | ~1 s  | β+ | 144Gd  | 1+  |  |
β+, p (rare)  | 143Eu
144m1Tb  | 396.9(5) keV  | 4.25(15) s  | IT (66%)  | 144Tb  | (6−)  |  |
β+ (34%)  | 144Gd
β+, p (<1%)  | 143Eu
144m2Tb  | 476.2(5) keV  | 2.8(3) µs  |  |  | (8−)  |  |
144m3Tb  | 517.1(5) keV  | 670(60) ns  |  |  | (9+)  |  |
144m4Tb  | 544.5(6) keV  | <300 ns  |  |  | (10+)  |  |
145Tb  | 65  | 80  | 144.92927(6)  | 20# min  | β+ | 145Gd  | (3/2+)  |  |
145mTb  | 0(100)# keV  | 30.9(7) s  | β+ | 145Gd  | (11/2−)  |  |
146Tb  | 65  | 81  | 145.92725(5)  | 8(4) s  | β+ | 146Gd  | 1+  |  |
146m1Tb  | 150(100)# keV  | 24.1(5) s  | β+ | 146Gd  | 5−  |  |
146m2Tb  | 930(100)# keV  | 1.18(2) ms  |  |  | (10+)  |  |
147Tb  | 65  | 82  | 146.924045(13)  | 1.64(3) h  | β+ | 147Gd  | 1/2+#  |  |
147mTb  | 50.6(9) keV  | 1.87(5) min  | β+ | 147Gd  | (11/2)−  |  |
148Tb  | 65  | 83  | 147.924272(15)  | 60(1) min  | β+ | 148Gd  | 2−  |  |
148m1Tb  | 90.1(3) keV  | 2.20(5) min  | β+ | 148Gd  | (9)+  |  |
148m2Tb  | 8618.6(10) keV  | 1.310(7) µs  |  |  | (27+)  |  |
149Tb  | 65  | 84  | 148.923246(5)  | 4.118(25) h  | β+ (83.3%)  | 149Gd  | 1/2+  |  |
α (16.7%)  | 145Eu
149mTb  | 35.78(13) keV  | 4.16(4) min  | β+ (99.97%)  | 149Gd  | 11/2−  |  |
α (.022%)  | 145Eu
150Tb  | 65  | 85  | 149.923660(8)  | 3.48(16) h  | β+ (99.95%)  | 150Gd  | (2−)  |  |
α (.05%)  | 146Eu
150mTb  | 457(29) keV  | 5.8(2) min  | β+ | 150Gd  | 9+  |  |
IT (rare)  | 150Tb
151Tb  | 65  | 86  | 150.923103(5)  | 17.609(1) h  | β+ (99.99%)  | 151Gd  | 1/2(+)  |  |
α (.0095%)  | 147Eu
151mTb  | 99.54(6) keV  | 25(3) s  | IT (93.8%)  | 151Tb  | (11/2−)  |  |
β+ (6.2%)  | 151Gd
152Tb  | 65  | 87  | 151.92407(4)  | 17.8784(95) h[2] | β+ | 152Gd | 2−  |  |
α (7×10−7%)  | 148Eu
152m1Tb  | 342.15(16) keV  | 0.96 µs  |  |  | 5−  |  |
152m2Tb  | 501.74(19) keV  | 4.2(1) min  | IT (78.8%)  | 152Tb  | 8+  |  |
β+ (21.2%)  | 152Gd
153Tb  | 65  | 88  | 152.923435(5)  | 2.34(1) d  | β+ | 153Gd  | 5/2+  |  |
153mTb  | 163.175(5) keV  | 186(4) µs  |  |  | 11/2−  |  |
154Tb  | 65  | 89  | 153.92468(5)  | 21.5(4) h  | β+ (99.9%)  | 154Gd | 0(+#)  |  |
β− (.1%)  | 154Dy
154m1Tb  | 12(7) keV  | 9.4(4) h  | β+ (78.2%)  | 154Gd | 3−  |  |
IT (21.8%)  | 154Tb
β− (.1%)  | 154Dy
154m2Tb  | 200(150)# keV  | 22.7(5) h  |  |  | 7−  |  |
154m3Tb  | 0+Z keV  | 513(42) ns  |  |  |  |  |
155Tb  | 65  | 90  | 154.923505(13)  | 5.32(6) d  | EC  | 155Gd | 3/2+  |  |
156Tb  | 65  | 91  | 155.924747(5)  | 5.35(10) d  | β+ | 156Gd | 3−  |  |
β− (rare)  | 156Dy
156m1Tb  | 54(3) keV  | 24.4(10) h  | IT  | 156Tb  | (7−)  |  |
156m2Tb  | 88.4(2) keV  | 5.3(2) h  |  |  | (0+)  |  |
157Tb  | 65  | 92  | 156.9240246(27)  | 71(7) y  | EC  | 157Gd | 3/2+  |  |
158Tb  | 65  | 93  | 157.9254131(28)  | 180(11) y  | β+ (83.4%)  | 158Gd | 3−  |  |
β− (16.6%)  | 158Dy
158m1Tb  | 110.3(12) keV  | 10.70(17) s  | IT (99.39%)  | 158Tb  | 0−  |  |
β− (.6%)  | 158Dy
β+ (.01%)  | 158Gd
158m2Tb  | 388.37(15) keV  | 0.40(4) ms  |  |  | 7−  |  |
159Tb[n 9] | 65  | 94  | 158.9253468(27)  | Stable | 3/2+  | 1.0000  |
160Tb  | 65  | 95  | 159.9271676(27)  | 72.3(2) d  | β− | 160Dy | 3−  |  |
161Tb[n 9] | 65  | 96  | 160.9275699(28)  | 6.906(19) d  | β− | 161Dy | 3/2+  |  |
162Tb  | 65  | 97  | 161.92949(4)  | 7.60(15) min  | β− | 162Dy | 1−  |  |
163Tb  | 65  | 98  | 162.930648(5)  | 19.5(3) min  | β− | 163Dy | 3/2+  |  |
164Tb  | 65  | 99  | 163.93335(11)  | 3.0(1) min  | β− | 164Dy | (5+)  |  |
165Tb  | 65  | 100  | 164.93488(21)#  | 2.11(10) min  | β− | 165mDy  | 3/2+#  |  |
166Tb  | 65  | 101  | 165.93799(11)  | 25.6(22) s  | β− | 166Dy  |  |  |
167Tb  | 65  | 102  | 166.94005(43)#  | 19.4(27) s  | β− | 167Dy  | 3/2+#  |  |
168Tb  | 65  | 103  | 167.94364(54)#  | 8.2(13) s  | β− | 168Dy  | 4−#  |  |
169Tb  | 65  | 104  | 168.94622(64)#  | 5.13(32) s  | β− | 169Dy  | 3/2+#  |  |
170Tb  | 65  | 105  | 169.95025(75)#  | 960(78) ms  | β− | 170Dy  |  |  |
171Tb  | 65  | 106  | 170.95330(86)#  | 1.23(10) s  | β− | 171Dy  | 3/2+#  |  |
172Tb  | 65  | 107  |  | 760(190) ms  | β− | 172Dy  | 6+#  |  |

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. ↑ 4.0 4.1 4.2 # - 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

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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. ↑ 9.0 9.1 Fission product

## References

1. ↑ Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; De Bièvre, Paul; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry 88 (3): 265–91. doi:10.1515/pac-2015-0305.
2. ↑ Collins, S.M.; Köster, U.; Robinson, A.P.; Ivanov, P.; Cocolios, T.E.; Russell, B.; Fenwick, A.J.; Bernerd, C. et al. (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 (Elsevier BV) 202: 111044. doi:10.1016/j.apradiso.2023.111044. ISSN 0969-8043. PMID 37797447.

* Isotope masses from:
* Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A 729: 3–128, doi:10.1016/j.nuclphysa.2003.11.001, Bibcode: 2003NuPhA.729....3A, https://hal.archives-ouvertes.fr/in2p3-00020241/document
* Isotopic compositions and standard atomic masses from:
* Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry 78 (11): 2051–2066. doi:10.1351/pac200678112051.
* Half-life, spin, and isomer data selected from the following sources.
* Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A 729: 3–128, doi:10.1016/j.nuclphysa.2003.11.001, Bibcode: 2003NuPhA.729....3A, https://hal.archives-ouvertes.fr/in2p3-00020241/document
* National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory. http://www.nndc.bnl.gov/nudat2/.
* Lide, David R., ed (2004). "11. Table of the Isotopes". CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.

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Isotopes of the chemical elements

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* Table of nuclides
* Categories: Isotopes
* Tables of nuclides
* Metastable isotopes
* Isotopes by element

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