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
158Tb synth 180 y ε
158Gd
β−
158Dy
159Tb 100%
stable
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    • Naturally occurring

    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

    Nuclide
    [n 1]     		Z N Isotopic mass (Da)
    [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]
    		 Natural abundance (mole fraction)
    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[4] 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+#
    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. ^ a b c # – 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. ^
      Fission product

    References

    1. doi:10.1088/1674-1137/abddae
      .
    2. ^ "Standard Atomic Weights: Terbium". CIAAW. 2021.
    3. ISSN 1365-3075
      .
    4. PMID 37797447
      .
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