Isotopes of gold

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Isotopes of gold (79Au)
Main isotopes[1] Decay
abun­dance half-life (t1/2) mode pro­duct
195Au synth 186.01 d ε
195Pt
196Au synth 6.165 d
β+
196Pt
β−
196Hg
197Au 100%
stable
198Au synth 2.69464 d β−
198Hg
199Au synth 3.139 d β−
199Hg
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    • observationally stable, meaning that 197Au is predicted to be radioactive but no actual decay has been observed.[4]

    List of isotopes

    Nuclide
    [n 1]     		Z N Isotopic mass (Da)[5]
    [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]
    		 Isotopic
    abundance
    Excitation energy[n 4]
    170Au[6] 79 91 169.99602(22)# 286+50
    −40     μs         		p (89%) 169Pt (2)−
    α (11%) 166Ir
    170mAu[6] 282(10) keV 617+50
    −40     μs         		p (58%) 169Pt (9)+
    α (42%) 166mIr
    171Au[6] 79 92 170.991882(22) 22+3
    −2     μs         		p 170Pt 1/2+
    α? 167Ir
    171mAu[6] 258(13) keV 1.09(3) ms α (66%) 167mIr 11/2−
    p (34%) 170Pt
    172Au 79 93 171.99000(6) 28(4) ms α (98%) 168Ir (2)−
    p (2%) 171Pt
    β+ 172Pt
    172mAu 160(250) keV 11.0(10) ms α 168Ir (9,10)+
    p? 171Pt
    173Au 79 94 172.986224(24) 25.5(8) ms α (86%) 169Ir (1/2+)
    β+ (14%) 173Pt
    173mAu 214(21) keV 12.2(1) ms α (89%) 169Ir (11/2−)
    β+ (11%) 173Pt
    174Au 79 95 173.98491(11)# 139(3) ms α (90%) 170Ir (3−)
    β+ (10%) 174Pt
    174mAu 130(50)# keV 162(2) ms α? 170Ir (9+)
    β+? 174Pt
    175Au 79 96 174.98132(4) 200(3) ms α (88%) 171Ir 1/2+
    β+ (12%) 175Pt
    175mAu 164(11)# keV 136(1) ms α (75%) 171Ir (11/2−)
    β+ (25%) 175Pt
    176Au 79 97 175.98012(4) 1.05(1) s α (75%) 172Ir (3−,4−)
    β+ (25%) 176Pt
    176mAu 139(13) keV 1.36(2) s α? 172Ir (8+,9+)
    β+? 176Pt
    177Au 79 98 176.976870(11) 1.501(20) s β+ (60%) 177Pt 1/2+
    α (40%) 173Ir
    177mAu 190(7) keV 1.193(13) s α (60%) 173Ir 11/2−
    β+ (40%) 177Pt
    178Au 79 99 177.976057(11) 3.4(5) s β+ (84%) 178Pt (2+,3−)
    α (16%) 174Ir
    178m1Au 50.3(2) keV 300(10) ns IT 178Au (4−,5+)
    178m2Au 186(14) keV 2.7(5) s β+ (82%) 178Pt (7+,8−)
    α (18%) 174Ir
    178m3Au 243(14) keV 390(10) ns IT 178Au (5+,6)
    179Au 79 100 178.973174(13) 7.1(3) s β+ (78.0%) 179Pt 1/2+
    α (22.0%) 175Ir
    179mAu 89.5(3) keV 327(5) ns IT 179Au (3/2−)
    180Au 79 101 179.9724898(51) 7.9(3) s β+ (99.42%) 180Pt (1+)
    α (0.58%) 176Ir
    181Au 79 102 180.970079(21) 13.7(14) s β+ (97.3%) 181Pt (5/2−)
    α (2.7%) 177Ir
    182Au 79 103 181.969614(20) 15.5(4) s β+ (99.87%) 182Pt (2+)
    α (0.13%) 178Ir
    183Au 79 104 182.967588(10) 42.8(10) s β+ (99.45%) 183Pt 5/2−
    α (0.55%) 179Ir
    183mAu 73.10(1) keV >1 μs IT 183Au (1/2)+
    184Au 79 105 183.967452(24) 20.6(9) s β+ (99.99%) 184Pt 5+
    α (0.013%) 180Ir
    184mAu 68.46(4) keV 47.6(14) s β+ (70%) 184Pt 2+
    IT
    (30%)     		184Au
    α (0.013%) 180Ir
    185Au 79 106 184.9657989(28) 4.25(6) min β+ (99.74%) 185Pt 5/2−
    α (0.26%) 181Ir
    185mAu 50(50)# keV 6.8(3) min β+ 185Pt 1/2+#
    IT? 185Au
    186Au 79 107 185.965953(23) 10.7(5) min β+ 186Pt 3−
    α (8×10−4%) 182Ir
    186mAu 227.77(7) keV 110(10) ns IT 186Au 2+
    187Au 79 108 186.964542(24) 8.3(2) min β+ 187Pt 1/2+
    α? 183Ir
    187mAu 120.33(14) keV 2.3(1) s IT 187Au 9/2−
    188Au 79 109 187.9652480(29) 8.84(6) min β+ 188Pt 1−
    189Au 79 110 188.963948(22) 28.7(4) min β+ 189Pt 1/2+
    α? (<3×10−5%) 185Ir
    189m1Au 247.25(16) keV 4.59(11) min β+ 189Pt 11/2−
    IT? 189Au
    189m2Au 325.12(16) keV 190(15) ns IT 189Au 9/2−
    189m3Au 2554.8(8) keV 242(10) ns IT 189Au 31/2+
    190Au 79 111 189.964752(4) 42.8(10) min β+ 190Pt 1−
    α? (<10−6%) 186Ir
    190mAu 200(150)# keV 125(20) ms IT 190Au 11−#
    β+? 190Pt
    191Au 79 112 190.963716(5) 3.18(8) h β+ 191Pt 3/2+
    191m1Au 266.2(7) keV 920(110) ms IT 191Au 11/2−
    191m2Au 2489.6(9) keV 402(20) ns IT 191Au 31/2+
    192Au 79 113 191.964818(17) 4.94(9) h β+ 192Pt 1−
    192m1Au 135.41(25) keV 29 ms IT 192Au 5+
    192m2Au 431.6(5) keV 160(20) ms IT 192Au 11−
    193Au 79 114 192.964138(9) 17.65(15) h β+[n 9] 193Pt 3/2+
    193m1Au 290.20(4) keV 3.9(3) s IT (99.97%) 193Au 11/2−
    β+ (0.03%) 193Pt
    193m2Au 2486.7(6) keV 150(50) ns IT 193Au 31/2+
    194Au 79 115 193.9654191(23) 38.02(10) h β+ 194Pt 1−
    194m1Au 107.4(5) keV 600(8) ms IT 194Au 5+
    194m2Au 475.8(6) keV 420(10) ms IT 194Au 11−
    195Au 79 116 194.9650378(12) 186.01(6) d EC 195Pt 3/2+
    195m1Au 318.58(4) keV 30.5(2) s IT 195Au 11/2−
    195m2Au 2501(20)# keV 12.89(21) μs IT 195Au 31/2(−)
    196Au 79 117 195.966571(3) 6.165(11) d β+ (93.0%) 196Pt 2−
    β− (7.0%) 196Hg
    196m1Au 84.656(20) keV 8.1(2) s IT 196Au 5+
    196m2Au 595.66(4) keV 9.603(22) h IT 196Au 12−
    197Au[n 10] 79 118 196.9665701(6)
    Observationally Stable[n 11]
    		 3/2+ 1.0000
    197m1Au 409.15(8) keV 7.73(6) s IT 197Au 11/2−
    197m2Au 2532.5(10) keV 150(5) ns IT 197Au 27/2+#
    198Au 79 119 197.9682437(6) 2.69517(21) d β− 198Hg 2−
    198m1Au 312.2200(20) keV 124(4) ns 5+
    198m2Au 811.7(15) keV 2.27(2) d IT 198Au (12−)
    199Au 79 120 198.9687666(6) 3.139(7) d β− 199Hg 3/2+
    199mAu 548.9368(21) keV 440(30) μs (11/2)−
    200Au 79 121 199.970757(29) 48.4(3) min β− 200Hg 1(−)
    200mAu 970(70) keV 18.7(5) h β− (82%) 200Hg 12−
    IT (18%) 200Au
    201Au 79 122 200.971658(3) 26(1) min β− 201Hg 3/2+
    201m1Au 594(5) keV 730(630) μs (11/2-)
    201m2Au 1610(5) keV 5.6(2.4) μs (11/2-)
    202Au 79 123 201.973856(25) 28.8(19) s β− 202Hg (1−)
    203Au 79 124 202.975154(3) 60(6) s β− 203Hg 3/2+
    203mAu 641(3) keV 140(44) μs IT 203Au 11/2−#
    204Au 79 125 203.97811(22)# 38.3(1.3) s β− 204Hg (2−)
    204mAu 3816(1000)# keV 2.1(0.3) μs IT 204Au 16+#
    205Au 79 126 204.98006(22)# 32.5(1.4) s β− 205Hg 3/2+#
    205m1Au 907(5) keV 6(2) s 11/2−#
    205m2Au 2850(5) keV 163(5) ns 19/2+#
    206Au 79 127 205.98477(32)# 47(11) s β− 206Hg (5+, 6+)
    207Au 79 128 206.98858(32)# 3# s 3/2+#
    208Au 79 129 207.99366(32)# 20# s 6+#
    209Au 79 130 208.99761(43)# 1# s 3/2+#
    210Au 79 131 210.00288(43)# 10# s 6+#
    This table header & footer:
    1. ^ mAu – 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. ^ Theoretically capable of α decay to 189Ir
    10. ^ Potential material for salted bombs
    11. ^ Theoretically predicted to undergo α decay to 193Ir

    References

    1. doi:10.1088/1674-1137/abddae
      .
    2. ^ "Standard Atomic Weights: Gold". CIAAW. 2017.
    3. ISSN 1365-3075
      .
    4. S2CID 201664098
      .
    5. doi:10.1088/1674-1137/abddaf
      .
    6. ^
      ISSN 0556-2813
      . Retrieved 11 June 2023.
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