# Isotopes of platinum

Naturally occurring platinum ($_{78}$Pt) consists of five stable isotopes ($^{192}$Pt, $^{194}$Pt, $^{195}$Pt, $^{196}$Pt, $^{198}$Pt) and one very long-lived (half-life 4.83×10$^{11}$ years) radioisotope ($^{190}$Pt). There are also 34 known synthetic radioisotopes, the longest-lived of which is $^{193}$Pt 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. Platinum-195 is the most abundant isotope.

## List of isotopes

| Nuclide | Z | N | Isotopic mass (Da) | Half-life | Decay mode | Daughter isotope | Spin and parity | Natural abundance (mole fraction) | Natural abundance (mole fraction) |
| Nuclide | Excitation energy | Excitation energy | Excitation energy | Half-life | Decay mode | Daughter isotope | Spin and parity | Normal proportion | Range of variation |
| $^{165}$Pt | 78 | 87 | 164.99966(43)# | 370(180) μs | α | $^{161}$Os | 7/2−# | | |
| $^{166}$Pt | 78 | 88 | 165.99487(32)# | 294(62) μs | α | $^{162}$Os | 0+ | | |
| $^{167}$Pt | 78 | 89 | 166.99275(33)# | 920(120) μs | α | $^{163}$Os | 7/2−# | | |
| $^{168}$Pt | 78 | 90 | 167.98818(16) | 2.02(10) ms | α | $^{164}$Os | 0+ | | |
| $^{168}$Pt | 78 | 90 | 167.98818(16) | 2.02(10) ms | β$^+$ ? | $^{168}$Ir | 0+ | | |
| $^{169}$Pt | 78 | 91 | 168.98662(22)# | 6.99(9) ms | α | $^{165}$Os | (7/2−) | | |
| $^{169}$Pt | 78 | 91 | 168.98662(22)# | 6.99(9) ms | β$^+$ ? | $^{169}$Ir | (7/2−) | | |
| $^{170}$Pt | 78 | 92 | 169.982502(20) | 13.93(16) ms | α | $^{166}$Os | 0+ | | |
| $^{170}$Pt | 78 | 92 | 169.982502(20) | 13.93(16) ms | β$^+$ ? | $^{170}$Ir | 0+ | | |
| $^{171}$Pt | 78 | 93 | 170.981249(87) | 45.5(25) ms | α (86%) | $^{167}$Os | 7/2− | | |
| $^{171}$Pt | 78 | 93 | 170.981249(87) | 45.5(25) ms | β$^+$ (14%) | $^{171}$Ir | 7/2− | | |
| $^{171m}$Pt | 412.6(10) keV | 412.6(10) keV | 412.6(10) keV | 901(9) ns | IT | $^{171}$Pt | 13/2+ | | |
| $^{172}$Pt | 78 | 94 | 171.977341(11) | 97.6(13) ms | α (96%) | $^{168}$Os | 0+ | | |
| $^{172}$Pt | 78 | 94 | 171.977341(11) | 97.6(13) ms | β$^+$ (4%) | $^{172}$Ir | 0+ | | |
| $^{173}$Pt | 78 | 95 | 172.976450(68) | 382(2) ms | α (86%) | $^{169}$Os | (5/2−) | | |
| $^{173}$Pt | 78 | 95 | 172.976450(68) | 382(2) ms | β$^+$ (14%) | $^{173}$Ir | (5/2−) | | |
| $^{174}$Pt | 78 | 96 | 173.972820(11) | 862(8) ms | α (74.9%) | $^{170}$Os | 0+ | | |
| $^{174}$Pt | 78 | 96 | 173.972820(11) | 862(8) ms | β$^+$ (25.1%) | $^{174}$Ir | 0+ | | |
| $^{175}$Pt | 78 | 97 | 174.972401(20) | 2.43(4) s | α (64%) | $^{171}$Os | (7/2−) | | |
| $^{175}$Pt | 78 | 97 | 174.972401(20) | 2.43(4) s | β$^+$ (36%) | $^{175}$Ir | (7/2−) | | |
| $^{176}$Pt | 78 | 98 | 175.968938(14) | 6.33(15) s | β$^+$ (60%) | $^{176}$Ir | 0+ | | |
| $^{176}$Pt | 78 | 98 | 175.968938(14) | 6.33(15) s | α (40%) | $^{172}$Os | 0+ | | |
| $^{177}$Pt | 78 | 99 | 176.968470(16) | 10.0(04) s | β$^+$ (94.3%) | $^{177}$Ir | 5/2− | | |
| $^{177}$Pt | 78 | 99 | 176.968470(16) | 10.0(04) s | α (5.7%) | $^{173}$Os | 5/2− | | |
| $^{177m}$Pt | 147.5(4) keV | 147.5(4) keV | 147.5(4) keV | 2.35(4) μs | IT | $^{177}$Pt | 1/2− | | |
| $^{178}$Pt | 78 | 100 | 177.965649(11) | 20.7(7) s | β$^+$ (92.3%) | $^{178}$Ir | 0+ | | |
| $^{178}$Pt | 78 | 100 | 177.965649(11) | 20.7(7) s | α (7.7%) | $^{174}$Os | 0+ | | |
| $^{179}$Pt | 78 | 101 | 178.9653588(86) | 21.2(4) s | β$^+$ (99.76%) | $^{179}$Ir | 1/2− | | |
| $^{179}$Pt | 78 | 101 | 178.9653588(86) | 21.2(4) s | α (0.24%) | $^{175}$Os | 1/2− | | |
| $^{180}$Pt | 78 | 102 | 179.963038(11) | 56(3) s | β$^+$ (99.48%) | $^{180}$Ir | 0+ | | |
| $^{180}$Pt | 78 | 102 | 179.963038(11) | 56(3) s | α (0.52%) | $^{176}$Os | 0+ | | |
| $^{181}$Pt | 78 | 103 | 180.963090(15) | 52.0(22) s | β$^+$ (99.93%) | $^{181}$Ir | 1/2− | | |
| $^{181}$Pt | 78 | 103 | 180.963090(15) | 52.0(22) s | α (0.074%) | $^{177}$Os | 1/2− | | |
| $^{181m}$Pt | 116.65(8) keV | 116.65(8) keV | 116.65(8) keV | >300 ns | IT | $^{181}$Pt | 7/2− | | |
| $^{182}$Pt | 78 | 104 | 181.961172(14) | 2.67(12) min | β$^+$ (99.962%) | $^{182}$Ir | 0+ | | |
| $^{182}$Pt | 78 | 104 | 181.961172(14) | 2.67(12) min | α (0.038%) | $^{178}$Os | 0+ | | |
| $^{183}$Pt | 78 | 105 | 182.961596(15) | 6.5(10) min | β$^+$ (99.99%) | $^{183}$Ir | 1/2− | | |
| $^{183}$Pt | 78 | 105 | 182.961596(15) | 6.5(10) min | α (0.0096%) | $^{179}$Os | 1/2− | | |
| $^{183m1}$Pt | 34.74(7) keV | 34.74(7) keV | 34.74(7) keV | 43(5) s | β$^+$ (96.9%) | $^{183}$Ir | 7/2− | | |
| $^{183m1}$Pt | 34.74(7) keV | 34.74(7) keV | 34.74(7) keV | 43(5) s | IT (3.1%) | $^{183}$Pt | 7/2− | | |
| $^{183m1}$Pt | 34.74(7) keV | 34.74(7) keV | 34.74(7) keV | 43(5) s | α ? | $^{179}$Os | 7/2− | | |
| $^{183m2}$Pt | 195.90(10) keV | 195.90(10) keV | 195.90(10) keV | >150 ns | IT | $^{183}$Pt | 9/2+ | | |
| $^{184}$Pt | 78 | 106 | 183.959922(16) | 17.3(2) min | β$^+$ | $^{184}$Ir | 0+ | | |
| $^{184}$Pt | 78 | 106 | 183.959922(16) | 17.3(2) min | α (0.0017%) | $^{180}$Os | 0+ | | |
| $^{184m}$Pt | 1840.3(8) keV | 1840.3(8) keV | 1840.3(8) keV | 1.01(5) ms | IT | $^{184}$Pt | 8− | | |
| $^{185}$Pt | 78 | 107 | 184.960614(28) | 70.9(24) min | β$^+$ | $^{185}$Ir | 9/2+ | | |
| $^{185}$Pt | 78 | 107 | 184.960614(28) | 70.9(24) min | α (0.0050%) | $^{181}$Os | 9/2+ | | |
| $^{185m1}$Pt | 103.41(5) keV | 103.41(5) keV | 103.41(5) keV | 33.0(8) min | β$^+$ | $^{185}$Ir | 1/2− | | |
| $^{185m2}$Pt | 200.89(4) keV | 200.89(4) keV | 200.89(4) keV | 728(20) ns | IT | $^{185}$Pt | 5/2− | | |
| $^{186}$Pt | 78 | 108 | 185.959351(23) | 2.08(5) h | β$^+$ | $^{186}$Ir | 0+ | | |
| $^{186}$Pt | 78 | 108 | 185.959351(23) | 2.08(5) h | α (1.4×10$^{−4}$%) | $^{182}$Os | 0+ | | |
| $^{187}$Pt | 78 | 109 | 186.960617(26) | 2.35(3) h | β$^+$ | $^{187}$Ir | 3/2− | | |
| $^{187m}$Pt | 174.38(22) keV | 174.38(22) keV | 174.38(22) keV | 311(15) μs | IT | $^{187}$Pt | 11/2+ | | |
| $^{188}$Pt | 78 | 110 | 187.9593975(57) | 10.16(18) d | EC | $^{188}$Ir | 0+ | | |
| $^{188}$Pt | 78 | 110 | 187.9593975(57) | 10.16(18) d | α (2.6×10$^{−5}$%) | $^{184}$Os | 0+ | | |
| $^{189}$Pt | 78 | 111 | 188.960848(11) | 10.87(12) h | β$^+$ | $^{189}$Ir | 3/2− | | |
| $^{189m1}$Pt | 172.79(6) keV | 172.79(6) keV | 172.79(6) keV | 464(25) ns | IT | $^{189}$Pt | 9/2− | | |
| $^{189m2}$Pt | 191.6(4) keV | 191.6(4) keV | 191.6(4) keV | 143(5) μs | IT | $^{189}$Pt | (13/2+) | | |
| $^{190}$Pt | 78 | 112 | 189.95994982(71) | 4.83(3)×10$^{11}$ y | α | $^{186}$Os | 0+ | 1.2(2)×10$^{−4}$ | |
| $^{191}$Pt | 78 | 113 | 190.9616763(44) | 2.83(2) d | EC | $^{191}$Ir | 3/2− | | |
| $^{191m1}$Pt | 100.663(20) keV | 100.663(20) keV | 100.663(20) keV | >1 μs | IT | $^{191}$Pt | 9/2− | | |
| $^{191m2}$Pt | 149.035(22) keV | 149.035(22) keV | 149.035(22) keV | 95(5) μs | IT | $^{191}$Pt | 13/2+ | | |
| $^{192}$Pt | 78 | 114 | 191.9610427(28) | Observationally Stable | Observationally Stable | Observationally Stable | 0+ | 0.00782(24) | |
| $^{192m}$Pt | 2172.37(13) keV | 2172.37(13) keV | 2172.37(13) keV | 272(23) ns | IT | $^{192}$Pt | 10− | | |
| $^{193}$Pt | 78 | 115 | 192.9629845(15) | 50(6) y | EC | $^{193}$Ir | 1/2− | | |
| $^{193m}$Pt | 149.78(4) keV | 149.78(4) keV | 149.78(4) keV | 4.33(3) d | IT | $^{193}$Pt | 13/2+ | | |
| $^{194}$Pt | 78 | 116 | 193.96268350(53) | Observationally Stable | Observationally Stable | Observationally Stable | 0+ | 0.3286(41) | |
| $^{195}$Pt | 78 | 117 | 194.96479433(54) | Observationally Stable | Observationally Stable | Observationally Stable | 1/2− | 0.3378(24) | |
| $^{195m}$Pt | 259.077(23) keV | 259.077(23) keV | 259.077(23) keV | 4.010(5) d | IT | $^{195}$Pt | 13/2+ | | |
| $^{196}$Pt | 78 | 118 | 195.96495465(55) | Observationally Stable | Observationally Stable | Observationally Stable | 0+ | 0.2521(34) | |
| $^{197}$Pt | 78 | 119 | 196.96734303(58) | 19.8915(19) h | β$^−$ | $^{197}$Au | 1/2− | | |
| $^{197m}$Pt | 399.59(20) keV | 399.59(20) keV | 399.59(20) keV | 95.41(18) min | IT (96.7%) | $^{197}$Pt | 13/2+ | | |
| $^{197m}$Pt | 399.59(20) keV | 399.59(20) keV | 399.59(20) keV | 95.41(18) min | β$^−$ (3.3%) | $^{197}$Au | 13/2+ | | |
| $^{198}$Pt | 78 | 120 | 197.9678967(23) | Observationally Stable | Observationally Stable | Observationally Stable | 0+ | 0.0734(13) | |
| $^{199}$Pt | 78 | 121 | 198.9705970(23) | 30.80(21) min | β$^−$ | $^{199}$Au | 5/2− | | |
| $^{199m}$Pt | 424(2) keV | 424(2) keV | 424(2) keV | 13.48(16) s | IT | $^{199}$Pt | 13/2+ | | |
| $^{200}$Pt | 78 | 122 | 199.971445(22) | 12.6(3) h | β$^−$ | $^{200}$Au | 0+ | | |
| $^{201}$Pt | 78 | 123 | 200.974513(54) | 2.5(1) min | β$^−$ | $^{201}$Au | (5/2−) | | |
| $^{202}$Pt | 78 | 124 | 201.975639(27) | 44(15) h | β$^−$ | $^{202}$Au | 0+ | | |
| $^{202m}$Pt | 1788.5(4) keV | 1788.5(4) keV | 1788.5(4) keV | 141(7) μs | IT | $^{202}$Pt | (7−) | | |
| $^{203}$Pt | 78 | 125 | 202.97906(22)# | 22(4) s | β$^−$ | $^{203}$Au | (1/2−) | | |
| $^{203m1}$Pt | 1367(3)# keV | 1367(3)# keV | 1367(3)# keV | 12(5) s | β$^−$ | $^{203}$Au | 13/2+# | | |
| $^{203m1}$Pt | 1367(3)# keV | 1367(3)# keV | 1367(3)# keV | 12(5) s | IT ? | $^{203}$Pt | 13/2+# | | |
| $^{203m2}$Pt | 1420(50)# keV | 1420(50)# keV | 1420(50)# keV | >100# ns | IT | $^{203}$Pt | 27/2−# | | |
| $^{203m3}$Pt | 2530(50)# keV | 2530(50)# keV | 2530(50)# keV | 641(55) ns | IT | $^{203}$Pt | 33/2+# | | |
| $^{204}$Pt | 78 | 126 | 203.98108(22)# | 10.3(14) s | β$^−$ | $^{204}$Au | 0+ | | |
| $^{204m1}$Pt | 1995.1(07) keV | 1995.1(07) keV | 1995.1(07) keV | 5.5(7) μs | IT | $^{204}$Pt | (5−) | | |
| $^{204m2}$Pt | 2035(23) keV | 2035(23) keV | 2035(23) keV | 55(3) μs | IT | $^{204}$Pt | (7−) | | |
| $^{204m3}$Pt | 3193(23) keV | 3193(23) keV | 3193(23) keV | 146(14) ns | IT | $^{204}$Pt | (10+) | | |
| $^{205}$Pt | 78 | 127 | 204.98624(32)# | 2# s | β$^−$ ? | $^{205}$Au | 9/2+# | | |
| $^{206}$Pt | 78 | 128 | 205.99008(32)# | 500# ms | β$^−$ ? | $^{206}$Au | 0+ | | |
| $^{206}$Pt | 78 | 128 | 205.99008(32)# | 500# ms | β$^−$n ? | $^{205}$Au | 0+ | | |
| $^{207}$Pt | 78 | 129 | 206.99556(43)# | 600# ms | β$^−$ ? | $^{207}$Au | 9/2+# | | |
| $^{207}$Pt | 78 | 129 | 206.99556(43)# | 600# ms | β$^−$n ? | $^{206}$Au | 9/2+# | | |
| $^{208}$Pt | 78 | 130 | 207.99946(43)# | 220# ms | β$^−$ ? | $^{208}$Au | 0+ | | |
| $^{208}$Pt | 78 | 130 | 207.99946(43)# | 220# ms | β$^−$n ? | $^{207}$Au | 0+ | | |
| This table header & footer: view ||||||||||
* ↑ $^m$Pt – Excited nuclear isomer.
* ↑ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
* ↑ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
* ↑ Bold half-life – nearly stable, half-life longer than age of universe.
* ↑ Modes of decay: EC:Electron capture IT:Isomeric transition
* ↑ Bold italics symbol as daughter – Daughter product is nearly stable.
* ↑ Bold symbol as daughter – Daughter product is stable.
* ↑ ( ) spin value – Indicates spin with weak assignment arguments.
* 1 2 # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
* ↑ Theorized to also undergo β$^+$β$^+$ decay to $^{190}$Os
* ↑ Believed to undergo α decay to $^{188}$Os with a half-life over 6.0×10$^{16}$ years
* ↑ Believed to undergo α decay to $^{190}$Os
* ↑ Believed to undergo α decay to $^{191}$Os with a half-life over 6.3×10$^{18}$ years
* ↑ Believed to undergo α decay to $^{192}$Os
* ↑ Believed to undergo α decay to $^{194}$Os or double β$^−$ decay to $^{198}$Hg with a half-life over 3.20×10$^{14}$ years