Isotopes of platinum
List of isotopes
Bold for isotopes with half-lives longer than the age of the universe (nearly stable) Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe) 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

Isotopes of platinum

Section Title: List of isotopes
Table Section Text: Bold for isotopes with half-lives longer than the age of the universe (nearly stable) Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe) 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

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)	daughter isotope(s)	nuclear spin and parity	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)

excitation energy

166Pt	78	88	165.99486(54)#	300(100) µs	α	162Os	0+

167Pt	78	89	166.99298(44)#	800(160) µs	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	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+

β− (3.3%)	197Au

198Pt	78	120	197.967893(3)	Observationally Stable	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(1.4) s	β−	204Au	0+

204m1Pt	1995.1(0.7) keV	5.5(0.7) µs	IT	204Pt	(5-)

204m2Pt	2035(23) keV	55(3) µs	IT	204Pt	(7-)

204m3Pt	3193(23) keV	146(14) ns	IT	204Pt	(10+)

Sentence(s)

The isotope of platinum 193 had a half-life of 50 years.

final_sentence: The isotope of platinum 193 had a half-life of 50 years.