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.

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)
Nuclide [n 1]	Excitation energy[n 9]			Half-life [n 4]	Decay mode [n 5]	Daughter isotope [n 6][n 7]	Spin and parity [n 8][n 9]	Normal proportion	Range of variation
¹⁶⁵Pt[2]	78	87		260(+260-90) μs	α	¹⁶¹Os
¹⁶⁶Pt	78	88	165.99486(54)#	260(+300-60) μs[2]	α	¹⁶²Os	0+
¹⁶⁷Pt	78	89	166.99298(44)#	1.1(2) ms[2]	α	¹⁶³Os	7/2−#
¹⁶⁸Pt	78	90	167.98815(22)	2.00(18) ms	α	¹⁶⁴Os	0+
¹⁶⁸Pt	78	90	167.98815(22)	2.00(18) ms	β⁺ (rare)	¹⁶⁸Ir	0+
¹⁶⁹Pt	78	91	168.98672(22)#	3.7(15) ms	α	¹⁶⁵Os	3/2−#
¹⁶⁹Pt	78	91	168.98672(22)#	3.7(15) ms	β⁺ (rare)	¹⁶⁹Ir	3/2−#
¹⁷⁰Pt	78	92	169.982495(20)	14.0(2) ms	α (98%)	¹⁶⁶Os	0+
¹⁷⁰Pt	78	92	169.982495(20)	14.0(2) ms	β⁺ (2%)	¹⁷⁰Ir	0+
¹⁷¹Pt	78	93	170.98124(9)	51(2) ms	α (99%)	¹⁶⁷Os	3/2−#
¹⁷¹Pt	78	93	170.98124(9)	51(2) ms	β⁺ (1%)	¹⁷¹Ir	3/2−#
¹⁷²Pt	78	94	171.977347(14)	98.4(24) ms	α (77%)	¹⁶⁸Os	0+
¹⁷²Pt	78	94	171.977347(14)	98.4(24) ms	β⁺ (23%)	¹⁷²Ir	0+
¹⁷³Pt	78	95	172.97644(6)	365(7) ms	α (84%)	¹⁶⁹Os	5/2−#
¹⁷³Pt	78	95	172.97644(6)	365(7) ms	β⁺ (16%)	¹⁷³Ir	5/2−#
¹⁷⁴Pt	78	96	173.972819(13)	0.889(17) s	α (83%)	¹⁷⁰Os	0+
¹⁷⁴Pt	78	96	173.972819(13)	0.889(17) s	β⁺ (17%)	¹⁷⁴Ir	0+
¹⁷⁵Pt	78	97	174.972421(20)	2.53(6) s	α (64%)	¹⁷¹Os	5/2−#
¹⁷⁵Pt	78	97	174.972421(20)	2.53(6) s	β⁺ (36%)	¹⁷⁵Ir	5/2−#
¹⁷⁶Pt	78	98	175.968945(15)	6.33(15) s	β⁺ (62%)	¹⁷⁶Ir	0+
¹⁷⁶Pt	78	98	175.968945(15)	6.33(15) s	α (38%)	¹⁷²Os	0+
¹⁷⁷Pt	78	99	176.968469(16)	10.6(4) s	β⁺ (94.4%)	¹⁷⁷Ir	5/2−
¹⁷⁷Pt	78	99	176.968469(16)	10.6(4) s	α (5.6%)	¹⁷³Os	5/2−
^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+
¹⁷⁸Pt	78	100	177.965649(12)	21.1(6) s	α (7.7%)	¹⁷⁴Os	0+
¹⁷⁹Pt	78	101	178.965363(10)	21.2(4) s	β⁺ (99.76%)	¹⁷⁹Ir	1/2−
¹⁷⁹Pt	78	101	178.965363(10)	21.2(4) s	α (0.24%)	¹⁷⁵Os	1/2−
¹⁸⁰Pt	78	102	179.963031(12)	56(2) s	β⁺ (99.7%)	¹⁸⁰Ir	0+
¹⁸⁰Pt	78	102	179.963031(12)	56(2) s	α (0.3%)	¹⁷⁶Os	0+
¹⁸¹Pt	78	103	180.963097(16)	52.0(22) s	β⁺ (99.93%)	¹⁸¹Ir	1/2−
¹⁸¹Pt	78	103	180.963097(16)	52.0(22) s	α (0.074%)	¹⁷⁷Os	1/2−
¹⁸²Pt	78	104	181.961171(17)	2.2(1) min	β⁺ (99.96%)	¹⁸²Ir	0+
¹⁸²Pt	78	104	181.961171(17)	2.2(1) min	α (.038%)	¹⁷⁸Os	0+
¹⁸³Pt	78	105	182.961597(17)	6.5(10) min	β⁺ (99.99%)	¹⁸³Ir	1/2−
¹⁸³Pt	78	105	182.961597(17)	6.5(10) min	α (.0096%)	¹⁷⁹Os	1/2−
^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+
¹⁸⁴Pt	78	106	183.959922(19)	17.3(2) min	α (.00169%)	¹⁸⁰Os	0+
^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+)
¹⁸⁵Pt	78	107	184.96062(4)	70.9(24) min	α (.005%)	¹⁸¹Os	(9/2+)
^185mPt	103.4(2) keV			33.0(8) min	β⁺ (98%)	¹⁸⁵Ir	(1/2−)
^185mPt	103.4(2) keV			33.0(8) min	α (2%)	¹⁸¹Os	(1/2−)
¹⁸⁶Pt	78	108	185.959351(23)	2.08(5) h	β⁺ (99.99%)	¹⁸⁶Ir	0+
¹⁸⁶Pt	78	108	185.959351(23)	2.08(5) h	α (1.4×10⁻⁴%)	¹⁸²Os	0+
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+
¹⁸⁸Pt	78	110	187.959395(6)	10.2(3) d	α (2.6×10⁻⁵%)	¹⁸⁴Os	0+
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)	Stable			0+	0.32967(99)
¹⁹⁵Pt	78	117	194.9647911(9)	Stable			1/2−	0.33832(10)
^195mPt	259.30(8) keV			4.010(5) d	IT	¹⁹⁵Pt	13/2+
¹⁹⁶Pt	78	118	195.9649515(9)	Stable			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+
^197mPt	399.59(20) keV			95.41(18) min	β⁻ (3.3%)	¹⁹⁷Au	13/2+
¹⁹⁸Pt	78	120	197.967893(3)	Observationally Stable[n 11]			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	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+)

^mPt – 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.
# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
Believed to undergo α decay to ¹⁸⁸Os with a half-life over 60×10¹⁵ years
Believed to undergo double β⁻ decay to ¹⁹⁸Hg with a half-life over 320×10¹² years

References

Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
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.

Isotope masses from:
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
Isotopic compositions and standard atomic masses from:
- de Laeter, John Robert; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
- Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051. Lay summary.
Half-life, spin, and isomer data selected from the following sources.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
- National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory.
- Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.

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[2] Pt – Excited nuclear isomer.

[3] ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.

[TMS-4] # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).

[5] Bold half-life – nearly stable, half-life longer than age of universe.

[6] Modes of decay:

EC: Electron capture

IT: Isomeric transition

[7] Bold italics symbol as daughter – Daughter product is nearly stable.

[8] Bold symbol as daughter – Daughter product is stable.

[9] ( ) spin value – Indicates spin with weak assignment arguments.

[TNN-10] # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

[12] Believed to undergo α decay to ¹⁸⁸Os with a half-life over 60×10¹⁵ years

[13] Believed to undergo double β⁻ decay to ¹⁹⁸Hg with a half-life over 320×10¹² years

[CIAAW2013-1] Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.

[pt165hg170-11] 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.

EC:	Electron capture
IT:	Isomeric transition