Isotopes of iridium

There are two natural isotopes of iridium (77Ir), and 37 radioisotopes, the most stable radioisotope being 192Ir with a half-life of 73.83 days, and many nuclear isomers, the most stable of which is 192m2Ir with a half-life of 241 years. All other isomers have half-lives under a year, most under a day. All isotopes of iridium are either radioactive or observationally stable, meaning that they are predicted to be radioactive but no actual decay has been observed.

List of isotopes

 * 164Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 87
 * 163.99220(44)#
 * <0.5 μs
 * p?
 * 163Os
 * 2−#
 * rowspan=2 style="text-indent:1em" | 164mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | 270(110)# keV
 * rowspan=2| 70(10) μs
 * p (96%)
 * 163Os
 * rowspan=2| 9+#
 * rowspan=2|
 * rowspan=2|
 * α (4%)
 * 160mRe
 * 165Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 88
 * 164.98752(23)#
 * p
 * 164Os
 * (1/2+)
 * rowspan=2 style="text-indent:1em" | 165mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | ~255 keV
 * rowspan=2|340(40) μs
 * p (88%)
 * 164Os
 * rowspan=2|(11/2−)
 * rowspan=2|
 * rowspan=2|
 * α (12%)
 * 161mRe
 * rowspan=2|166Ir
 * rowspan=2 style="text-align:right" | 77
 * rowspan=2 style="text-align:right" | 89
 * rowspan=2|165.98582(22)#
 * rowspan=2|10.5(22) ms
 * α (93%)
 * 162Re
 * rowspan=2|(2−)
 * rowspan=2|
 * rowspan=2|
 * p (7%)
 * 165Os
 * rowspan=2 style="text-indent:1em" | 166mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | 172(6) keV
 * rowspan=2|15.1(9) ms
 * α (98.2%)
 * 162Re
 * rowspan=2|(9+)
 * rowspan=2|
 * rowspan=2|
 * p (1.8%)
 * 165Os
 * rowspan=3|167Ir
 * rowspan=3 style="text-align:right" | 77
 * rowspan=3 style="text-align:right" | 90
 * rowspan=3|166.981665(20)
 * rowspan=3|35.2(20) ms
 * α (48%)
 * 163Re
 * rowspan=3|1/2+
 * rowspan=3|
 * rowspan=3|
 * p (32%)
 * 166Os
 * β+ (20%)
 * 167Os
 * rowspan=3 style="text-indent:1em" | 167mIr
 * rowspan=3 colspan="3" style="text-indent:2em" | 175.3(22) keV
 * rowspan=3|30.0(6) ms
 * α (80%)
 * 163Re
 * rowspan=3|11/2−
 * rowspan=3|
 * rowspan=3|
 * β+ (20%)
 * 167Os
 * p (.4%)
 * 166Os
 * rowspan=2|168Ir
 * rowspan=2 style="text-align:right" | 77
 * rowspan=2 style="text-align:right" | 91
 * rowspan=2|167.97988(16)#
 * rowspan=2|161(21) ms
 * α
 * 164Re
 * rowspan=2|(2-)
 * rowspan=2|
 * rowspan=2|
 * β+ (rare)
 * 168Os
 * style="text-indent:1em" | 168mIr
 * colspan="3" style="text-indent:2em" | 50(100)# keV
 * 125(40) ms
 * α
 * 164Re
 * (9+)
 * rowspan=2|169Ir
 * rowspan=2 style="text-align:right" | 77
 * rowspan=2 style="text-align:right" | 92
 * rowspan=2|168.976295(28)
 * rowspan=2|780(360) ms [0.64(+46−24) s]
 * α
 * 165Re
 * rowspan=2|(1/2+)
 * rowspan=2|
 * rowspan=2|
 * β+ (rare)
 * 169Os
 * rowspan=2 style="text-indent:1em" | 169mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | 154(24) keV
 * rowspan=2|308(22) ms
 * α (72%)
 * 165Re
 * rowspan=2|(11/2−)
 * rowspan=2|
 * rowspan=2|
 * β+ (28%)
 * 169Os
 * rowspan=2|170Ir
 * rowspan=2 style="text-align:right" | 77
 * rowspan=2 style="text-align:right" | 93
 * rowspan=2|169.97497(11)#
 * rowspan=2|910(150) ms [0.87(+18−12) s]
 * β+ (64%)
 * 170Os
 * rowspan=2|low#
 * rowspan=2|
 * rowspan=2|
 * α (36%)
 * 166Re
 * rowspan=3 style="text-indent:1em" | 170mIr
 * rowspan=3 colspan="3" style="text-indent:2em" | 160(50)# keV
 * rowspan=3|440(60) ms
 * α (36%)
 * 166Re
 * rowspan=3|(8+)
 * rowspan=3|
 * rowspan=3|
 * β+
 * 170Os
 * IT
 * 170Ir
 * rowspan=2|171Ir
 * rowspan=2 style="text-align:right" | 77
 * rowspan=2 style="text-align:right" | 94
 * rowspan=2|170.97163(4)
 * rowspan=2|3.6(10) s [3.2(+13−7) s]
 * α (58%)
 * 167Re
 * rowspan=2|1/2+
 * rowspan=2|
 * rowspan=2|
 * β+ (42%)
 * 171Os
 * style="text-indent:1em" | 171mIr
 * colspan="3" style="text-indent:2em" | 180(30)# keV
 * 1.40(10) s
 * (11/2−)
 * rowspan=2|172Ir
 * rowspan=2 style="text-align:right" | 77
 * rowspan=2 style="text-align:right" | 95
 * rowspan=2|171.970610(30)
 * rowspan=2|4.4(3) s
 * β+ (98%)
 * 172Os
 * rowspan=2|(3+)
 * rowspan=2|
 * rowspan=2|
 * α (2%)
 * 168Re
 * rowspan=2 style="text-indent:1em" | 172mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | 280(100)# keV
 * rowspan=2|2.0(1) s
 * β+ (77%)
 * 172Os
 * rowspan=2|(7+)
 * rowspan=2|
 * rowspan=2|
 * α (23%)
 * 168Re
 * rowspan=2|173Ir
 * rowspan=2 style="text-align:right" | 77
 * rowspan=2 style="text-align:right" | 96
 * rowspan=2|172.967502(15)
 * rowspan=2|9.0(8) s
 * β+ (93%)
 * 173Os
 * rowspan=2|(3/2+,5/2+)
 * rowspan=2|
 * rowspan=2|
 * α (7%)
 * 169Re
 * rowspan=2 style="text-indent:1em" | 173mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | 253(27) keV
 * rowspan=2|2.20(5) s
 * β+ (88%)
 * 173Os
 * rowspan=2|(11/2−)
 * rowspan=2|
 * rowspan=2|
 * α (12%)
 * 169Re
 * rowspan=2|174Ir
 * rowspan=2 style="text-align:right" | 77
 * rowspan=2 style="text-align:right" | 97
 * rowspan=2|173.966861(30)
 * rowspan=2|7.9(6) s
 * β+ (99.5%)
 * 174Os
 * rowspan=2|(3+)
 * rowspan=2|
 * rowspan=2|
 * α (.5%)
 * 170Re
 * rowspan=2 style="text-indent:1em" | 174mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | 193(11) keV
 * rowspan=2|4.9(3) s
 * β+ (99.53%)
 * 174Os
 * rowspan=2|(7+)
 * rowspan=2|
 * rowspan=2|
 * α (.47%)
 * 170Re
 * rowspan=2|175Ir
 * rowspan=2 style="text-align:right" | 77
 * rowspan=2 style="text-align:right" | 98
 * rowspan=2|174.964113(21)
 * rowspan=2|9(2) s
 * β+ (99.15%)
 * 175Os
 * rowspan=2|(5/2−)
 * rowspan=2|
 * rowspan=2|
 * α (.85%)
 * 171Re
 * rowspan=2|176Ir
 * rowspan=2 style="text-align:right" | 77
 * rowspan=2 style="text-align:right" | 99
 * rowspan=2|175.963649(22)
 * rowspan=2|8.3(6) s
 * β+ (97.9%)
 * 176Os
 * rowspan=2|
 * rowspan=2|
 * rowspan=2|
 * α (2.1%)
 * 172Re
 * rowspan=2|177Ir
 * rowspan=2 style="text-align:right" | 77
 * rowspan=2 style="text-align:right" | 100
 * rowspan=2|176.961302(21)
 * rowspan=2|30(2) s
 * β+ (99.94%)
 * 177Os
 * rowspan=2|5/2−
 * rowspan=2|
 * rowspan=2|
 * α (.06%)
 * 173Re
 * 178Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 101
 * 177.961082(21)
 * 12(2) s
 * β+
 * 178Os
 * 179Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 102
 * 178.959122(12)
 * 79(1) s
 * β+
 * 179Os
 * (5/2)−
 * 180Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 103
 * 179.959229(23)
 * 1.5(1) min
 * β+
 * 180Os
 * (4,5)(+#)
 * 181Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 104
 * 180.957625(28)
 * 4.90(15) min
 * β+
 * 181Os
 * (5/2)−
 * 182Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 105
 * 181.958076(23)
 * 15(1) min
 * β+
 * 182Os
 * (3+)
 * rowspan=2|183Ir
 * rowspan=2 style="text-align:right" | 77
 * rowspan=2 style="text-align:right" | 106
 * rowspan=2|182.956846(27)
 * rowspan=2|57(4) min
 * β+ ( 99.95%)
 * 183Os
 * rowspan=2|5/2−
 * rowspan=2|
 * rowspan=2|
 * α (.05%)
 * 179Re
 * 184Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 107
 * 183.95748(3)
 * 3.09(3) h
 * β+
 * 184Os
 * 5−
 * style="text-indent:1em" | 184m1Ir
 * colspan="3" style="text-indent:2em" | 225.65(11) keV
 * 470(30) μs
 * 3+
 * style="text-indent:1em" | 184m2Ir
 * colspan="3" style="text-indent:2em" | 328.40(24) keV
 * 350(90) ns
 * (7)+
 * 185Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 108
 * 184.95670(3)
 * 14.4(1) h
 * β+
 * 185Os
 * 5/2−
 * 186Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 109
 * 185.957946(18)
 * 16.64(3) h
 * β+
 * 186Os
 * 5+
 * rowspan=2 style="text-indent:1em" | 186mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | 0.8(4) keV
 * rowspan=2|1.92(5) h
 * β+
 * 186Os
 * rowspan=2|2−
 * rowspan=2|
 * rowspan=2|
 * IT (rare)
 * 186Ir
 * 187Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 110
 * 186.957363(7)
 * 10.5(3) h
 * β+
 * 187Os
 * 3/2+
 * style="text-indent:1em" | 187m1Ir
 * colspan="3" style="text-indent:2em" | 186.15(4) keV
 * 30.3(6) ms
 * IT
 * 187Ir
 * 9/2−
 * style="text-indent:1em" | 187m2Ir
 * colspan="3" style="text-indent:2em" | 433.81(9) keV
 * 152(12) ns
 * 11/2−
 * 188Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 111
 * 187.958853(8)
 * 41.5(5) h
 * β+
 * 188Os
 * 1−
 * rowspan=2 style="text-indent:1em" | 188mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | 970(30) keV
 * rowspan=2|4.2(2) ms
 * IT
 * 188Ir
 * rowspan=2|7+#
 * rowspan=2|
 * rowspan=2|
 * β+ (rare)
 * 188Os
 * 189Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 112
 * 188.958719(14)
 * 13.2(1) d
 * EC
 * 189Os
 * 3/2+
 * style="text-indent:1em" | 189m1Ir
 * colspan="3" style="text-indent:2em" | 372.18(4) keV
 * 13.3(3) ms
 * IT
 * 189Ir
 * 11/2−
 * style="text-indent:1em" | 189m2Ir
 * colspan="3" style="text-indent:2em" | 2333.3(4) keV
 * 3.7(2) ms
 * (25/2)+
 * rowspan=2|190Ir
 * rowspan=2 style="text-align:right" | 77
 * rowspan=2 style="text-align:right" | 113
 * rowspan=2|189.9605460(18)
 * rowspan=2|11.78(10) d
 * EC
 * rowspan=2|190Os
 * rowspan=2|4−
 * rowspan=2 |
 * β+ (<0.002%)
 * style="text-indent:1em" | 190m1Ir
 * colspan="3" style="text-indent:2em" | 26.1(1) keV
 * 1.120(3) h
 * IT
 * 190Ir
 * (1−)
 * style="text-indent:1em" | 190m2Ir
 * colspan="3" style="text-indent:2em" | 36.154(25) keV
 * >2 μs
 * (4)+
 * style="text-indent:1em" | 190m3Ir
 * colspan="3" style="text-indent:2em" | 376.4(1) keV
 * 3.087(12) h
 * (11)−
 * 191Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 114
 * 190.9605940(18)
 * colspan=3 align=center|Observationally Stable
 * 3/2+
 * 0.373(2)
 * style="text-indent:1em" | 191m1Ir
 * colspan="3" style="text-indent:2em" | 171.24(5) keV
 * 4.94(3) s
 * IT
 * 191Ir
 * 11/2−
 * style="text-indent:1em" | 191m2Ir
 * colspan="3" style="text-indent:2em" | 2120(40) keV
 * 5.5(7) s
 * rowspan=2|192Ir
 * rowspan=2 style="text-align:right" | 77
 * rowspan=2 style="text-align:right" | 115
 * rowspan=2|191.9626050(18)
 * rowspan=2|73.827(13) d
 * β− (95.24%)
 * 192Pt
 * rowspan=2|4+
 * rowspan=2|
 * rowspan=2|
 * EC (4.76%)
 * 192Os
 * rowspan=2 style="text-indent:1em" | 192m1Ir
 * rowspan=2 colspan="3" style="text-indent:2em" | 56.720(5) keV
 * rowspan=2|1.45(5) min
 * IT (98.25%)
 * 192Ir
 * rowspan=2|1−
 * rowspan=2|
 * rowspan=2|
 * β− (1.75%)
 * 192Pt
 * style="text-indent:1em" | 192m2Ir
 * colspan="3" style="text-indent:2em" | 168.14(12) keV
 * 241(9) y
 * IT
 * 192Ir
 * (11−)
 * 193Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 116
 * 192.9629264(18)
 * colspan=3 align=center|Observationally Stable
 * 3/2+
 * 0.627(2)
 * style="text-indent:1em" | 193mIr
 * colspan="3" style="text-indent:2em" | 80.240(6) keV
 * 10.53(4) d
 * IT
 * 193Ir
 * 11/2−
 * 194Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 117
 * 193.9650784(18)
 * 19.28(13) h
 * β−
 * 194Pt
 * 1−
 * style="text-indent:1em" | 194m1Ir
 * colspan="3" style="text-indent:2em" | 147.078(5) keV
 * 31.85(24) ms
 * IT
 * 194Ir
 * (4+)
 * style="text-indent:1em" | 194m2Ir
 * colspan="3" style="text-indent:2em" | 370(70) keV
 * 171(11) d
 * (10,11)(−#)
 * 195Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 118
 * 194.9659796(18)
 * 2.5(2) h
 * β−
 * 195Pt
 * 3/2+
 * rowspan=2 style="text-indent:1em" | 195mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | 100(5) keV
 * rowspan=2|3.8(2) h
 * β− (95%)
 * 195Pt
 * rowspan=2|11/2−
 * rowspan=2|
 * rowspan=2|
 * IT (5%)
 * 195Ir
 * 196Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 119
 * 195.96840(4)
 * 52(1) s
 * β−
 * 196Pt
 * (0−)
 * rowspan=2 style="text-indent:1em" | 196mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | 210(40) keV
 * rowspan=2|1.40(2) h
 * β− (99.7%)
 * 196Pt
 * rowspan=2|(10,11−)
 * rowspan=2|
 * rowspan=2|
 * IT
 * 196Ir
 * 197Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 120
 * 196.969653(22)
 * 5.8(5) min
 * β−
 * 197Pt
 * 3/2+
 * rowspan=2 style="text-indent:1em" | 197mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | 115(5) keV
 * rowspan=2|8.9(3) min
 * β− (99.75%)
 * 197Pt
 * rowspan=2|11/2−
 * rowspan=2|
 * rowspan=2|
 * IT (.25%)
 * 197Ir
 * 198Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 121
 * 197.97228(21)#
 * 8(1) s
 * β−
 * 198Pt
 * 199Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 122
 * 198.97380(4)
 * 7(5) s
 * β−
 * 199Pt
 * 3/2+#
 * style="text-indent:1em" | 199mIr
 * colspan="3" style="text-indent:2em" | 130(40)# keV
 * 235(90) ns
 * IT
 * 199Ir
 * 11/2−#
 * 200Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 123
 * 199.976800(210)#
 * 43(6) s
 * β−
 * 200Pt
 * (2-, 3-)
 * 201Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 124
 * 200.978640(210)#
 * 21(5) s
 * β−
 * 201Pt
 * (3/2+)
 * 202Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 125
 * 201.981990(320)#
 * 11(3) s
 * β−
 * 202Pt
 * (2-)
 * style="text-indent:1em" | 202mIr
 * colspan="3" style="text-indent:2em" | 2000(1000)# keV
 * 3.4(0.6) μs
 * IT
 * 202Ir
 * EC (4.76%)
 * 192Os
 * rowspan=2 style="text-indent:1em" | 192m1Ir
 * rowspan=2 colspan="3" style="text-indent:2em" | 56.720(5) keV
 * rowspan=2|1.45(5) min
 * IT (98.25%)
 * 192Ir
 * rowspan=2|1−
 * rowspan=2|
 * rowspan=2|
 * β− (1.75%)
 * 192Pt
 * style="text-indent:1em" | 192m2Ir
 * colspan="3" style="text-indent:2em" | 168.14(12) keV
 * 241(9) y
 * IT
 * 192Ir
 * (11−)
 * 193Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 116
 * 192.9629264(18)
 * colspan=3 align=center|Observationally Stable
 * 3/2+
 * 0.627(2)
 * style="text-indent:1em" | 193mIr
 * colspan="3" style="text-indent:2em" | 80.240(6) keV
 * 10.53(4) d
 * IT
 * 193Ir
 * 11/2−
 * 194Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 117
 * 193.9650784(18)
 * 19.28(13) h
 * β−
 * 194Pt
 * 1−
 * style="text-indent:1em" | 194m1Ir
 * colspan="3" style="text-indent:2em" | 147.078(5) keV
 * 31.85(24) ms
 * IT
 * 194Ir
 * (4+)
 * style="text-indent:1em" | 194m2Ir
 * colspan="3" style="text-indent:2em" | 370(70) keV
 * 171(11) d
 * (10,11)(−#)
 * 195Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 118
 * 194.9659796(18)
 * 2.5(2) h
 * β−
 * 195Pt
 * 3/2+
 * rowspan=2 style="text-indent:1em" | 195mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | 100(5) keV
 * rowspan=2|3.8(2) h
 * β− (95%)
 * 195Pt
 * rowspan=2|11/2−
 * rowspan=2|
 * rowspan=2|
 * IT (5%)
 * 195Ir
 * 196Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 119
 * 195.96840(4)
 * 52(1) s
 * β−
 * 196Pt
 * (0−)
 * rowspan=2 style="text-indent:1em" | 196mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | 210(40) keV
 * rowspan=2|1.40(2) h
 * β− (99.7%)
 * 196Pt
 * rowspan=2|(10,11−)
 * rowspan=2|
 * rowspan=2|
 * IT
 * 196Ir
 * 197Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 120
 * 196.969653(22)
 * 5.8(5) min
 * β−
 * 197Pt
 * 3/2+
 * rowspan=2 style="text-indent:1em" | 197mIr
 * rowspan=2 colspan="3" style="text-indent:2em" | 115(5) keV
 * rowspan=2|8.9(3) min
 * β− (99.75%)
 * 197Pt
 * rowspan=2|11/2−
 * rowspan=2|
 * rowspan=2|
 * IT (.25%)
 * 197Ir
 * 198Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 121
 * 197.97228(21)#
 * 8(1) s
 * β−
 * 198Pt
 * 199Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 122
 * 198.97380(4)
 * 7(5) s
 * β−
 * 199Pt
 * 3/2+#
 * style="text-indent:1em" | 199mIr
 * colspan="3" style="text-indent:2em" | 130(40)# keV
 * 235(90) ns
 * IT
 * 199Ir
 * 11/2−#
 * 200Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 123
 * 199.976800(210)#
 * 43(6) s
 * β−
 * 200Pt
 * (2-, 3-)
 * 201Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 124
 * 200.978640(210)#
 * 21(5) s
 * β−
 * 201Pt
 * (3/2+)
 * 202Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 125
 * 201.981990(320)#
 * 11(3) s
 * β−
 * 202Pt
 * (2-)
 * style="text-indent:1em" | 202mIr
 * colspan="3" style="text-indent:2em" | 2000(1000)# keV
 * 3.4(0.6) μs
 * IT
 * 202Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 122
 * 198.97380(4)
 * 7(5) s
 * β−
 * 199Pt
 * 3/2+#
 * style="text-indent:1em" | 199mIr
 * colspan="3" style="text-indent:2em" | 130(40)# keV
 * 235(90) ns
 * IT
 * 199Ir
 * 11/2−#
 * 200Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 123
 * 199.976800(210)#
 * 43(6) s
 * β−
 * 200Pt
 * (2-, 3-)
 * 201Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 124
 * 200.978640(210)#
 * 21(5) s
 * β−
 * 201Pt
 * (3/2+)
 * 202Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 125
 * 201.981990(320)#
 * 11(3) s
 * β−
 * 202Pt
 * (2-)
 * style="text-indent:1em" | 202mIr
 * colspan="3" style="text-indent:2em" | 2000(1000)# keV
 * 3.4(0.6) μs
 * IT
 * 202Ir
 * style="text-align:right" | 77
 * style="text-align:right" | 125
 * 201.981990(320)#
 * 11(3) s
 * β−
 * 202Pt
 * (2-)
 * style="text-indent:1em" | 202mIr
 * colspan="3" style="text-indent:2em" | 2000(1000)# keV
 * 3.4(0.6) μs
 * IT
 * 202Ir
 * 3.4(0.6) μs
 * IT
 * 202Ir

Iridium-192
Iridium-192 (symbol 192Ir) is a radioactive isotope of iridium, with a half-life of 73.83 days. It decays by emitting beta (β) particles and gamma (γ) radiation. About 96% of 192Ir decays occur via emission of β and γ radiation, leading to 192Pt. Some of the β particles are captured by other 192Ir nuclei, which are then converted to 192Os. Electron capture is responsible for the remaining 4% of 192Ir decays. Iridium-192 is normally produced by neutron activation of natural-abundance iridium metal.

Iridium-192 is a very strong gamma ray emitter, with a gamma dose-constant of approximately 1.54 μSv·h−1·MBq−1 at 30 cm, and a specific activity of 341 TBq·g−1 (9.22 kCi·g−1). There are seven principal energy packets produced during its disintegration process ranging from just over 0.2 to about 0.6 MeV.

The 192m2Ir isomer is unusual, both for its long half-life for an isomer, and that said half-life greatly exceeds that of the ground state of the same isotope.