Isotopes of platinum

Naturally occurring platinum (78Pt) consists of five stable isotopes (192Pt, 194Pt, 195Pt, 196Pt, 198Pt) and one very long-lived (half-life 6.50×1011 years) radioisotope (190Pt). There are also 34 known synthetic radioisotopes, the longest-lived of which is 193Pt with a half-life of 50 years. All other isotopes have half-lives under a year, most under a day. All isotopes of platinum are either radioactive or observationally stable, meaning that they are predicted to be radioactive but no actual decay has been observed.

Isotopes of platinum (78Pt)
Main isotopes[1] Decay
abun­dance half-life (t1/2) mode pro­duct
190Pt 0.0120% 4.83×1011 y α 186Os
192Pt 0.782% stable
193Pt synth 50 y ε 193Ir
194Pt 32.9% stable
195Pt 33.8% stable
196Pt 25.2% stable
198Pt 7.36% stable
Standard atomic weight Ar°(Pt)
  • 195.084±0.009
  • 195.08±0.02 (abridged)[2][3]

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 9]
Natural abundance (mole fraction)
Excitation energy[n 9] Normal proportion Range of variation
165Pt[4] 78 87 260+260
−90
 μs
α 161Os
166Pt 78 88 165.99486(54)# 260+300
−60
 μs
[4]
α 162Os 0+
167Pt 78 89 166.99298(44)# 1.1(2) ms[4] α 163Os 7/2−#
168Pt 78 90 167.98815(22) 2.00(18) ms α 164Os 0+
β+ (rare) 168Ir
169Pt 78 91 168.98672(22)# 3.7(15) ms α 165Os 3/2−#
β+ (rare) 169Ir
170Pt 78 92 169.982495(20) 14.0(2) ms α (98%) 166Os 0+
β+ (2%) 170Ir
171Pt 78 93 170.98124(9) 51(2) ms α (99%) 167Os 3/2−#
β+ (1%) 171Ir
172Pt 78 94 171.977347(14) 98.4(24) ms α (77%) 168Os 0+
β+ (23%) 172Ir
173Pt 78 95 172.97644(6) 365(7) ms α (84%) 169Os 5/2−#
β+ (16%) 173Ir
174Pt 78 96 173.972819(13) 0.889(17) s α (83%) 170Os 0+
β+ (17%) 174Ir
175Pt 78 97 174.972421(20) 2.53(6) s α (64%) 171Os 5/2−#
β+ (36%) 175Ir
176Pt 78 98 175.968945(15) 6.33(15) s β+ (62%) 176Ir 0+
α (38%) 172Os
177Pt 78 99 176.968469(16) 10.6(4) s β+ (94.4%) 177Ir 5/2−
α (5.6%) 173Os
177mPt 147.4(4) keV 2.2(3) μs 1/2−
178Pt 78 100 177.965649(12) 21.1(6) s β+ (92.3%) 178Ir 0+
α (7.7%) 174Os
179Pt 78 101 178.965363(10) 21.2(4) s β+ (99.76%) 179Ir 1/2−
α (0.24%) 175Os
180Pt 78 102 179.963031(12) 56(2) s β+ (99.7%) 180Ir 0+
α (0.3%) 176Os
181Pt 78 103 180.963097(16) 52.0(22) s β+ (99.93%) 181Ir 1/2−
α (0.074%) 177Os
182Pt 78 104 181.961171(17) 2.2(1) min β+ (99.96%) 182Ir 0+
α (.038%) 178Os
183Pt 78 105 182.961597(17) 6.5(10) min β+ (99.99%) 183Ir 1/2−
α (.0096%) 179Os
183m1Pt 34.50(8) keV 43(5) s β+ (99.99%) 183Ir (7/2)−
α (4×10−4%) 179Os
IT 183Pt
183m2Pt 195.68(11) keV >150 ns (9/2)+
184Pt 78 106 183.959922(19) 17.3(2) min β+ (99.99%) 184Ir 0+
α (.00169%) 180Os
184mPt 1839.4(16) keV 1.01(5) ms IT 184Pt 8−
185Pt 78 107 184.96062(4) 70.9(24) min β+ (99.99%) 185Ir (9/2+)
α (.005%) 181Os
185mPt 103.4(2) keV 33.0(8) min β+ (98%) 185Ir (1/2−)
α (2%) 181Os
186Pt 78 108 185.959351(23) 2.08(5) h β+ (99.99%) 186Ir 0+
α (1.4×10−4%) 182Os
187Pt 78 109 186.96059(3) 2.35(3) h β+ 187Ir 3/2−
188Pt 78 110 187.959395(6) 10.2(3) d EC (99.99%) 188Ir 0+
α (2.6×10−5%) 184Os
189Pt 78 111 188.960834(12) 10.87(12) h β+ 189Ir 3/2−
189m1Pt 172.80(6) keV 464(25) ns 9/2−
189m2Pt 191.6(4) keV 143(5) μs (13/2+)
190Pt 78 112 189.959932(6) 6.5(3)×1011 y α 186Os 0+ 1.4(1)×10−4
191Pt 78 113 190.961677(5) 2.862(7) d EC 191Ir 3/2−
191m1Pt 100.67(2) keV >1 μs (9/2)−
191m2Pt 149.04(2) keV 95(5) μs (13/2)+
192Pt 78 114 191.9610380(27) Observationally Stable[n 10] 0+ 0.00782(7)
193Pt 78 115 192.9629874(18) 50(6) y EC 193Ir 1/2−
193mPt 149.78(4) keV 4.33(3) d IT 193Pt 13/2+
194Pt 78 116 193.9626803(9) Observationally Stable[n 11] 0+ 0.32967(99)
195Pt 78 117 194.9647911(9) Observationally Stable[n 12][n 13] 1/2− 0.33832(10)
195mPt 259.30(8) keV 4.010(5) d IT 195Pt 13/2+
196Pt 78 118 195.9649515(9) Observationally Stable[n 14] 0+ 0.25242(41)
197Pt 78 119 196.9673402(9) 19.8915(19) h β 197Au 1/2−
197mPt 399.59(20) keV 95.41(18) min IT (96.7%) 197Pt 13/2+
β (3.3%) 197Au
198Pt 78 120 197.967893(3) Observationally Stable[n 15] 0+ 0.07163(55)
199Pt 78 121 198.970593(3) 30.80(21) min β 199Au 5/2−
199mPt 424(2) keV 13.6(4) s IT 199Pt (13/2)+
200Pt[5] 78 122 199.971441(22) 12.5(3) h β 200Au 0+
201Pt 78 123 200.97451(5) 2.5(1) min β 201Au (5/2−)
202Pt 78 124 201.97574(32) 44(15) h β 202Au 0+
202mPt 1788.5(0.4) keV 141(7) μs IT 202Pt (7−)
203Pt 78 125 202.97893(200)# 22(4) s β 203Au (1/2−)
203mPt 3100# keV 641(55) μs IT 203Pt 33/2+#
204Pt 78 126 203.98076(200)# 10.3(14) s β 204Au 0+
204m1Pt 1995.1(0.7) keV 5.5(7) μs IT 204Pt (5−)
204m2Pt 2035(23) keV 55(3) μs IT 204Pt (7−)
204m3Pt 3193(23) keV 146(14) ns IT 204Pt (10+)
This table header & footer:
  1. mPt  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. Bold half-life  nearly stable, half-life longer than age of universe.
  5. Modes of decay:
    EC:Electron capture
    IT:Isomeric transition
  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. #  Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
  10. Believed to undergo α decay to 188Os with a half-life over 60×1015 years
  11. Believed to undergo α decay to 190Os
  12. Believed to undergo α decay to 191Os
  13. Can undergo bound-state β decay to 195Au
  14. Believed to undergo α decay to 192Os
  15. Believed to undergo double β decay to 198Hg with a half-life over 320×1012 years

References

  1. 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.
  2. "Standard Atomic Weights: Platinum". CIAAW. 2005.
  3. Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; et al. (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. Hilton, J.; et al. (2019). "α-spectroscopy studies of the new nuclides 165Pt and 170Hg" (PDF). Physical Review C. 100 (1): 014305. doi:10.1103/PhysRevC.100.014305. S2CID 199118719.
  5. John, P. R.; Valiente-Dobón, J. J.; Mengoni, D.; Modamio, V.; Lunardi, S.; Bazzacco, D.; Gadea, A.; Wheldon, C.; Rodríguez, T. R.; Alexander, T.; de Angelis, G.; Ashwood, N.; Barr, M.; Benzoni, G.; Birkenbach, B. (2017-06-01). "In-beam γ -ray spectroscopy of the neutron-rich platinum isotope 200Pt toward the N =126 shell gap". Physical Review C. 95: 064321. doi:10.1103/PhysRevC.95.064321. ISSN 0556-2813.
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