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Isotopes of Platinum

List, data and properties of all known isotopes of Platinum.

Content
Atomic properties
Decay properties
NMR active nuclides
Radiation protection
References
Platinum isotopes

All atomic nuclei of the chemical element platinum are summarized under platinum isotopes; these all consist of an atomic nucleus with 78 protons and, in the uncharged state, 78 electrons. The difference between each platinum isotope is based on the number of neutrons in the nucleus.

 

Naturally Occurring Platinum Isotopes

The platinum found on earth consists of five stable isotopes and one long-lived radioisotope with the following percentage distribution:

Atomic Mass maQuantityHalf-lifeSpin
Platinum
Isotopic mixture		195,084 u100 %
Isotope 190Pt189,95993(4) u0,012(2) %6.5(3) × 1011 a0+
Isotope 192Pt191,96104(2) u0,782(24) %stable0+
Isotope 194Pt193,962681(6) u32,864(410) %stable0+
Isotope 195Pt194,964792(6) u33,775(240) %stable1/2-
Isotope 196Pt195,964952(6) u25,211(340) %stable0+
Isotope 198Pt197,96789(2) u7,356(130) %stable0+

 

All other previously known and characterized platinum nuclides are unstable; with a half-life of 50 years, the platinum isotope 193 is the longest-lived radioisotope. Technically, the artificial platinum nuclides are of no importance.

 

Isotope Table: Platinum

The two following tables list the most important data and properties of the Platinum isotopes. Further information on the individual Platinum isotopes is listed on separate pages and can be accessed via the link in column 1.

 

Atomic Properties

Isotope
Nuclide		ENAtomic Mass
[Nuclear Mass]
{Mass Excess}		Spin I
(h/2π)		Parent
123456
Platinum-16616678Pt88165.99492(32) u
[165.9521353 u]
{-4.73199 MeV}		0+
Platinum-16716778Pt89166.99290(32) u
[166.9501153 u]
{-6.61361 MeV}
Platinum-16816878Pt90167.98818(16) u
[167.9453953 u]
{-11.01026 MeV}		0+
Platinum-16916978Pt91168.98657(21) u
[168.9437853 u]
{-12.50996 MeV}		(7/2-)
Platinum-17017078Pt92169.982502(20) u
[169.9397173 u]
{-16.29928 MeV}		0+171Au
174Hg
Platinum-17117178Pt93170.98125(8) u
[170.9384653 u]
{-17.46551 MeV}		(7/2-)175Hg
Platinum-171m171m78Pt93170.98125(8) u
[170.9384653 u]
{-17.46551 MeV}		(13/2+)
Platinum-17217278Pt94171.977341(11) u
[171.9345563 u]
{-21.10672 MeV}		0+176Hg
Platinum-17317378Pt95172.97644(6) u
[172.9336553 u]
{-21.946 MeV}		(5/2-)177Hg
Platinum-17417478Pt96173.972820(11) u
[173.9300353 u]
{-25.31801 MeV}		0+178Hg
Platinum-17517578Pt97174.972395(20) u
[174.9296103 u]
{-25.71389 MeV}		7/2-179Hg
Platinum-17617678Pt98175.968938(14) u
[175.9261533 u]
{-28.93407 MeV}		0+180Hg
Platinum-17717778Pt99176.968470(16) u
[176.9256853 u]
{-29.37001 MeV}		5/2-181Hg
Platinum-177m177m78Pt99176.968470(16) u
[176.9256853 u]
{-29.37001 MeV}		1/2-
Platinum-17817878Pt100177.965649(11) u
[177.9228643 u]
{-31.99775 MeV}		0+182Hg
179Hg
Platinum-17917978Pt101178.965359(9) u
[178.9225743 u]
{-32.26788 MeV}		1/2-183Hg
Platinum-18018078Pt102179.963032(12) u
[179.9202473 u]
{-34.43547 MeV}		0+184Hg
181Hg
180Au
Platinum-18118178Pt103180.963090(15) u
[180.9203053 u]
{-34.38144 MeV}		1/2-185Hg
181Au
Platinum-18218278Pt104181.961172(14) u
[181.9183873 u]
{-36.16805 MeV}		0+186Hg
183Hg
182Au
Platinum-18318378Pt105182.961597(17) u
[182.9188123 u]
{-35.77216 MeV}		1/2-187Hg
183Au
Platinum-183m183m78Pt105182.961597(17) u
[182.9188123 u]
{-35.77216 MeV}		(7/2)-
Platinum-18418478Pt106183.959920(17) u
[183.9171353 u]
{-37.33428 MeV}		0+188Hg
184Au
Platinum-184m184m78Pt106183.959920(17) u
[183.9171353 u]
{-37.33428 MeV}		8-
Platinum-18518578Pt107184.960614(28) u
[184.9178293 u]
{-36.68782 MeV}		9/2+185Au
Platinum-185m185m78Pt107184.960614(28) u
[184.9178293 u]
{-36.68782 MeV}		1/2-
Platinum-18618678Pt108185.959351(23) u
[185.9165663 u]
{-37.8643 MeV}		0+186Au
Platinum-18718778Pt109186.960617(26) u
[186.9178323 u]
{-36.68503 MeV}		3/2-187Au
Platinum-18818878Pt110187.959398(6) u
[187.9166133 u]
{-37.82052 MeV}		0+188Au
Platinum-18918978Pt111188.960849(11) u
[188.9180643 u]
{-36.46892 MeV}		3/2-189Au
Platinum-189m1189m178Pt111188.960849(11) u
[188.9180643 u]
{-36.46892 MeV}		9/2-
Platinum-189m2189m278Pt111188.960849(11) u
[188.9180643 u]
{-36.46892 MeV}		(13/2+)
Platinum-19019078Pt112189.95993(4) u
[189.9171453 u]
{-37.32496 MeV}		0+190Au
Platinum-19119178Pt113190.961676(4) u
[190.9188913 u]
{-35.69858 MeV}		3/2-191Au
Platinum-191m1191m178Pt113190.961676(4) u
[190.9188913 u]
{-35.69858 MeV}		(9/2)-
Platinum-191m2191m278Pt113190.961676(4) u
[190.9188913 u]
{-35.69858 MeV}		(13/2)+
Platinum-19219278Pt114191.96104(2) u
[191.9182553 u]
{-36.29101 MeV}		0+192Au
192Ir
Platinum-19319378Pt115192.9629846(15) u
[192.9201999 u]
{-34.47962 MeV}		1/2-193Au
Platinum-193m193m78Pt115192.9629846(15) u
[192.9201999 u]
{-34.47962 MeV}		13/2+
Platinum-19419478Pt116193.962681(6) u
[193.9198963 u]
{-34.76242 MeV}		0+194Au
194Ir
Platinum-19519578Pt117194.964792(6) u
[194.9220073 u]
{-32.79604 MeV}		1/2-195Au
195Ir
Platinum-195m195m78Pt117194.964792(6) u
[194.9220073 u]
{-32.79604 MeV}		13/2+
Platinum-19619678Pt118195.964952(6) u
[195.9221673 u]
{-32.647 MeV}		0+196Au
196Ir
Platinum-19719778Pt119196.9673431(6) u
[196.9245584 u]
{-30.41971 MeV}		1/2-197Ir
Platinum-197m197m78Pt119196.9673431(6) u
[196.9245584 u]
{-30.41971 MeV}		13/2+
Platinum-19819878Pt120197.96789(2) u
[197.9251053 u]
{-29.91027 MeV}		0+198Ir
Platinum-19919978Pt121198.9705970(23) u
[198.9278123 u]
{-27.38872 MeV}		5/2-
Platinum-199m199m78Pt121198.9705970(23) u
[198.9278123 u]
{-27.38872 MeV}		(13/2)+
Platinum-20020078Pt122199.971445(22) u
[199.9286603 u]
{-26.59881 MeV}		0+
Platinum-20120178Pt123200.97451(5) u
[200.9317253 u]
{-23.74378 MeV}		(5/2-)
Platinum-20220278Pt124201.975639(27) u
[201.9328543 u]
{-22.69213 MeV}		0+
Platinum-202m202m78Pt124201.975639(27) u
[201.9328543 u]
{-22.69213 MeV}		(7-)
Platinum-20320378Pt125202.97893(21) u
[202.9361453 u]
{-19.62658 MeV}		(1/2-)
Platinum-20420478Pt126203.98076(21) u
[203.9379753 u]
{-17.92194 MeV}		0+
Platinum-20520578Pt127204.98608(32) u
[204.9432953 u]
{-12.9664 MeV}
Platinum-20620678Pt128205.98966(32) u
[205.9468753 u]
{-9.63165 MeV}		0+
Platinum-20720778Pt129206.99513(43) u
[206.9523453 u]
{-4.53638 MeV}
Platinum-20820878Pt130207.99894(43) u
[207.9561553 u]
{-0.98738 MeV}		0+

 

Radioactive Decay Properties

IsotopeRadioactive DecayExtern
Half-lifeDecay ModeProbabilityEnergy
789101112
Pt-166300(100) μsα → 162Os100 %7.286(15) MeVAL
Pt-1670.7(2) msα → 163Os100 %7.16(5) MeVAL
Pt-1682.02(10) msα → 164Osca. 100 %6.99(3) MeVAL
Pt-1697.0(2) msα → 165Osca. 100 %6.858(20) MeVAL
Pt-17013.8(5) msα → 166Os
EC/β+ → 170Ir		98(2) %
?		6.707(3) MeV
7.06(9) MeV		AL
Pt-17145.5(25) msα → 167Os
EC/β+ → 171Ir		90(7) %
10(7) %		6.607(3) MeV
8.94(8) MeV		AL
Pt-171m901(9) nsIso → 171Pt100 %
Pt-17297.6(13) msα → 168Os
EC/β+ → 172Ir		94(6) %
6(6) %		6.463(4) MeV
6.27(3) MeV		AL
Pt-173382(2) msα → 169Os
EC/β+ → 173Ir		86(4) %
16(6) %		6.35(5) MeV
8.33(6) MeV		AL
Pt-174889(17) msα → 170Os
EC/β+ → 174Ir		76(8) %
24(8) %		6.183(3) MeV
5.545(26) MeV		AL
Pt-1752.53(6) sα → 171Os
EC/β+ → 175Ir		64(5) %
36(5) %		6.164(4) MeV
7.681(22) MeV		AL
Pt-1766.33(15) sα → 172Os
EC/β+ → 176Ir		40(2) %
60(2) %		5.8851(21) MeV
4.944(21) MeV		AL
Pt-17710.0(4) sα → 173Os
EC/β+ → 177Ir		5.7(5) %
94.3(5) %		5.6429(27) MeV
6.677(25) MeV		AL
Pt-177m2.2(3) μs
Pt-17820.7(7) sα → 174Os
EC/β+ → 178Ir		7.7(3) %
92.3(3) %		5.5730(22) MeV
4.254(22) MeV		AL
Pt-17921.2(4) sα → 175Os
EC/β+ → 179Ir		0.24(3) %
99.76(3) %		5.412(9) MeV
5.814(13) MeV		AL
Pt-18056(2) sα → 176Os
EC/β+ → 180Ir		ca. 0.3 %
ca. 99.7 %		5.24(3) MeV
3.542(24) MeV		AL
Pt-18152.0(22) sα → 177Os
EC/β+ → 181Ir		ca. 0.08 %
ca. 99.92 %		5.15(5) MeV
5.082(15) %		AL
Pt-1822.67(12) minα → 178Os
EC/β+ → 182Ir		0.038(2) %
99.962(2) %		4.951(5) MeV
2.883(25) MeV		AL
Pt-1836.5(10) minα → 179Os
EC/β+ → 183Ir		0.0096(5) %
99.9904 %		4.822(9) MeV
4.431(29) MeV		AL
Pt-183m43(5) sα → 179Os
EC/β+ → 183Ir
Iso → 183Pt		< 0.0004 %
96.9(8) %
3.1(8) %
Pt-18417.3(2) minα → 180Os
EC/β+ → 184Ir		ca. 0.001 %
99.999 %		4.599(8) MeV
2.28(3) MeV		AL
Pt-184m1.01(5) msIso → 184Pt100 %
Pt-18570.9(24) minEC/β+ → 185Ir< 100 %3.65(4) MeVAL
Pt-185m33.0(8) minEC/β+ → 185Ir
Iso → 185Pt
α → 181Os		99(1) %
< 2 %
0.001 %
Pt-1862.08(5) hEC/β+ → 186Ir
α → 182Os		99.99986 %
0.00014 %		1.308(27) MeV
4.320(18) MeV		AL
Pt-1872.35(3) hEC/β+ → 187Ir100 %2.86(4) MeVAL
Pt-18810.16(18) dEC/β+ → 188Ir
α → 184Os		99.999974(3)
0.000026 %		0.524(11) MeV
4.007(5) MeV		AL
Pt-18910.87(12) hEC/β+ → 189Ir100 %1.980(16) MeVAL
Pt-189m1464(25) nsIso → 189Pt100 %
Pt-189m2143(5) μsIso → 189Pt100 %
Pt-1906.5(3) × 1011 aα → 186Os100 %3.2686(6) MeVAL
Pt-1912.83(2) dEC → 191Ir100 %1.011(4) MeVAL
Pt-191m11 μs
Pt-191m295(5) μsIso → 191Pt100 %
Pt-192stableAL
Pt-19350(6) aEC → 193Ir100 %0.0566(19) MeVAL
Pt-193m4.33(3) dIso → 193Pt100 %
Pt-194stableAL
Pt-195stableAL
Pt-195m4.010(5) dIso → 195Pt100 %
Pt-196stableAL
Pt-19719.8915(19) hβ- → 197Au100 %0.7200(5) MeVAL
Pt-197m95.41(18) minβ- → 197Au
Iso → 197Pt		3.3(4) %
96.7(4) %
Pt-198stable2 β- ?AL
Pt-19930.80(21) minβ- → 199Au100 %1.7051(21) MeVAL
Pt-199m13.6(4) sIso → 199Pt100 %
Pt-20012.6(3) hβ- → 200Au100 %0.64(3) MeVAL
Pt-2012.5(1) minβ- → 201Au100 %2.66(5) MeVAL
Pt-20244(15) hβ- → 202Au100 %1.66(30) MeVAL
Pt-202m0.28 msIso → 202Ptca. 100 %
Pt-20310(3) sβ- → 203Au100 %3.52(20) MeVAL
Pt-20410.3(14) sβ- → 204Au100 %2.73(28) MeVAL
Pt-205300 nsβ- → 205Au?5.80(36) MeVAL
160 nsβ- → 206Au
β-, n → 205Au		?
?		4.58(42) MeV
1.07(36) MeV
160 nsβ- → 207Au
β-, n → 206Au		?
?		6.27(50) MeV
1.60(50) MeV
160 nsβ- → 108Au
β-, n → 107Au		?
?		5.11(50) MeV
1.75(50) MeV

 

Notes (related to the columns):

1 - name of the nuclide, isotope.
2 - E: isotope symbol with mass number (superscript; number of nucleons) and Atomic number (subscript; number of protons).
3 - N: number of neutrons.
4 - relative atomic mass of the Platinum isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
5 - nuclear spin I, unit: h/2π.
6 - source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.

7 - isotope notation in short form.
8 - decay: half-live of the Platinum isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
9 - decay mode: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
10 - decay probability in percent (%).
11 - decay energy; Particle energy related to decay type.
12 - other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

NMR active Platinum nuclides

Nuclide
quantity 1)
spin		Nuclear
magnetic
moment
μ/μN		Gyromagnetic ratio
{Quadrupole moment}		Resonant
frequency
v0 bei 1 T		Relative
sensitivity
H0 = const.
v0 = const. 3)
195Pt
33,775(240) %
1/2-		+ 0,60952(6)5,8383
{}		9,29220,01039
0,2182

1) Quantity Percentage of natural occurrence.

2) Gyromagnetic ratio: 107 rad T-1 s-1
    Quadrupole moment: Q [barn] = [100 fm2]

3) Related to 1H = 1,000.

 

Radiation Protection

According to the Radiation Protection Ordinance (StrlSchV 2018, Germany), the following values (columns 1 to 7) apply to the handling of Platinum radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Pt-186+106 Bq10 Bq/g2.1 h
Pt-188+106 Bq10 Bq/gIr-18810.2 d
Pt-189106 Bq100 Bq/g10.9 h
Pt-191+106 Bq10 Bq/g10 Bq cm-22.8 d
Pt-193107 Bq10 Bq/g3000 TBq50.0 a
Pt-193m107 Bq1000 Bq/g10 TBq100 Bq cm-24.3 d
Pt-195m106 Bq100 Bq/g2 TBq4.1 d
Pt-197106 Bq1000 Bq/g4 TBq100 Bq cm-219.9 h
Pt-197m+106 Bq100 Bq/g0,9 TBq10 Bq cm-295.3 min
Pt-199106 Bq100 Bq/g30.8 min
Pt-200+106 Bq100 Bq/g12.5 h

(HASS = High-Activity Sealed Radioactive Sources; SC = surface contamination)

 

Literature Sources and References

Properties of the Platinum nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Platinum: NMR properties - 195Pt-NMR

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

[9] - J. W. Arblaster:
The Discoverers of the Platinum Isotopes.
In: Platinum Metals Review, (2000).

[10] - S. Amos, J. L.Gross, M. Thoennessen:
Discovery of the calcium, indium, tin, and platinum isotopes.
In: Atomic Data and Nuclear Data Tables, (2011), DOI 10.1016/j.adt.2011.03.001.

 

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