Physics:Isotopes of platinum

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Short description: Nuclides with atomic number of 78 but with different mass numbers

Naturally occurring platinum (78Pt) consists of five stable isotopes (192Pt, 194Pt, 195Pt, 196Pt, 198Pt) and one very long-lived (half-life 4.83×1011 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. Platinum-195 is the most abundant isotope.

List of isotopes

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 9] 		Physics:Natural abundance (mole fraction)
Excitation energy[n 9] Normal proportion Range of variation
165Pt 78 87 164.99966(43)# 370(180) μs α 161Os 7/2−#
166Pt 78 88 165.99487(32)# 294(62) μs α 162Os 0+
167Pt 78 89 166.99275(33)# 920(120) μs α 163Os 7/2−#
168Pt 78 90 167.98818(16) 2.02(10) ms α 164Os 0+
β+ ? 168Ir
169Pt 78 91 168.98662(22)# 6.99(9) ms α 165Os (7/2−)
β+ ? 169Ir
170Pt 78 92 169.982502(20) 13.93(16) ms α 166Os 0+
β+ ? 170Ir
171Pt 78 93 170.981249(87) 45.5(25) ms α (86%) 167Os 7/2−
β+ (14%) 171Ir
171mPt 412.6(10) keV 901(9) ns IT 171Pt 13/2+
172Pt 78 94 171.977341(11) 97.6(13) ms α (96%) 168Os 0+
β+ (4%) 172Ir
173Pt 78 95 172.976450(68) 382(2) ms α (86%) 169Os (5/2−)
β+ (14%) 173Ir
174Pt 78 96 173.972820(11) 862(8) ms α (74.9%) 170Os 0+
β+ (25.1%) 174Ir
175Pt 78 97 174.972401(20) 2.43(4) s α (64%) 171Os (7/2−)
β+ (36%) 175Ir
176Pt 78 98 175.968938(14) 6.33(15) s β+ (60%) 176Ir 0+
α (40%) 172Os
177Pt 78 99 176.968470(16) 10.0(04) s β+ (94.3%) 177Ir 5/2−
α (5.7%) 173Os
177mPt 147.5(4) keV 2.35(4) μs IT 177Pt 1/2−
178Pt 78 100 177.965649(11) 20.7(7) s β+ (92.3%) 178Ir 0+
α (7.7%) 174Os
179Pt 78 101 178.9653588(86) 21.2(4) s β+ (99.76%) 179Ir 1/2−
α (0.24%) 175Os
180Pt 78 102 179.963038(11) 56(3) s β+ (99.48%) 180Ir 0+
α (0.52%) 176Os
181Pt 78 103 180.963090(15) 52.0(22) s β+ (99.93%) 181Ir 1/2−
α (0.074%) 177Os
181mPt 116.65(8) keV >300 ns IT 181Pt 7/2−
182Pt 78 104 181.961172(14) 2.67(12) min β+ (99.962%) 182Ir 0+
α (0.038%) 178Os
183Pt 78 105 182.961596(15) 6.5(10) min β+ (99.99%) 183Ir 1/2−
α (0.0096%) 179Os
183m1Pt 34.74(7) keV 43(5) s β+ (96.9%) 183Ir 7/2−
IT (3.1%) 183Pt
α ? 179Os
183m2Pt 195.90(10) keV >150 ns IT 183Pt 9/2+
184Pt 78 106 183.959922(16) 17.3(2) min β+ 184Ir 0+
α (0.0017%) 180Os
184mPt 1840.3(8) keV 1.01(5) ms IT 184Pt 8−
185Pt 78 107 184.960614(28) 70.9(24) min β+ 185Ir 9/2+
α (0.0050%) 181Os
185m1Pt 103.41(5) keV 33.0(8) min β+ 185Ir 1/2−
185m2Pt 200.89(4) keV 728(20) ns IT 185Pt 5/2−
186Pt 78 108 185.959351(23) 2.08(5) h β+ 186Ir 0+
α (1.4×10−4%) 182Os
187Pt 78 109 186.960617(26) 2.35(3) h β+ 187Ir 3/2−
187mPt 174.38(22) keV 311(15) μs IT 187Pt 11/2+
188Pt 78 110 187.9593975(57) 10.16(18) d EC 188Ir 0+
α (2.6×10−5%) 184Os
189Pt 78 111 188.960848(11) 10.87(12) h β+ 189Ir 3/2−
189m1Pt 172.79(6) keV 464(25) ns IT 189Pt 9/2−
189m2Pt 191.6(4) keV 143(5) μs IT 189Pt (13/2+)
190Pt 78 112 189.95994982(71) 4.83(3)×1011 y α[n 10] 186Os 0+ 1.2(2)×10−4
191Pt 78 113 190.9616763(44) 2.83(2) d EC 191Ir 3/2−
191m1Pt 100.663(20) keV >1 μs IT 191Pt 9/2−
191m2Pt 149.035(22) keV 95(5) μs IT 191Pt 13/2+
192Pt 78 114 191.9610427(28) Observationally Stable[n 11] 0+ 0.00782(24)
192mPt 2172.37(13) keV 272(23) ns IT 192Pt 10−
193Pt 78 115 192.9629845(15) 50(6) y EC 193Ir 1/2−
193mPt 149.78(4) keV 4.33(3) d IT 193Pt 13/2+
194Pt 78 116 193.96268350(53) Observationally Stable[n 12] 0+ 0.3286(41)
195Pt 78 117 194.96479433(54) Observationally Stable[n 13] 1/2− 0.3378(24)
195mPt 259.077(23) keV 4.010(5) d IT 195Pt 13/2+
196Pt 78 118 195.96495465(55) Observationally Stable[n 14] 0+ 0.2521(34)
197Pt 78 119 196.96734303(58) 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 78 120 197.9678967(23) Observationally Stable[n 15] 0+ 0.0734(13)
199Pt 78 121 198.9705970(23) 30.80(21) min β− 199Au 5/2−
199mPt 424(2) keV 13.48(16) s IT 199Pt 13/2+
200Pt 78 122 199.971445(22) 12.6(3) h β− 200Au 0+
201Pt 78 123 200.974513(54) 2.5(1) min β− 201Au (5/2−)
202Pt 78 124 201.975639(27) 44(15) h β− 202Au 0+
202mPt 1788.5(4) keV 141(7) μs IT 202Pt (7−)
203Pt 78 125 202.97906(22)# 22(4) s β− 203Au (1/2−)
203m1Pt 1367(3)# keV 12(5) s β− 203Au 13/2+#
IT ? 203Pt
203m2Pt 1420(50)# keV >100# ns IT 203Pt 27/2−#
203m3Pt 2530(50)# keV 641(55) ns IT 203Pt 33/2+#
204Pt 78 126 203.98108(22)# 10.3(14) s β− 204Au 0+
204m1Pt 1995.1(07) 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+)
205Pt 78 127 204.98624(32)# 2# s β− ? 205Au 9/2+#
206Pt 78 128 205.99008(32)# 500# ms β− ? 206Au 0+
β−n ? 205Au
207Pt 78 129 206.99556(43)# 600# ms β− ? 207Au 9/2+#
β−n ? 206Au
208Pt 78 130 207.99946(43)# 220# ms β− ? 208Au 0+
β−n ? 207Au
  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. ↑ 9.0 9.1 # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
  10. ↑ Theorized to also undergo β+β+ decay to 190Os
  11. ↑ Believed to undergo α decay to 188Os with a half-life over 6.0×1016 years
  12. ↑ Believed to undergo α decay to 190Os
  13. ↑ Believed to undergo α decay to 191Os with a half-life over 6.3×1018 years
  14. ↑ Believed to undergo α decay to 192Os
  15. ↑ Believed to undergo α decay to 194Os or double β− decay to 198Hg with a half-life over 3.20×1014 years

References



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