자연계에 존재하는 이리듐의 안정 동위 원소는 2개로 191Ir, 193Ir이 있다. 인공적으로 만들어진 이리듐의 동위 원소는 164Ir부터 199Ir까지 있는데, 이들 중 194m2Ir의 반감기가 171일, 192Ir의 반감기는 73.8일로 이리듐의 인공 동위 원소들 중 가장 긴 반감기를 가지고 있다. 핵자수 Z(p) N(n) 동위 원소 질량 (u) 반감기 붕괴방식ε 전자 포획IT 이성질핵 전이 붕괴 생성동위 원소 핵스핀 자연계에 존재하는동위 원소범위(몰 분율) 자연계에 존재하는최대 범위(몰 분율) 들뜬 에너지 164Ir 77 87 163.99220(44)# 1# ms 2-# 164mIr 270(110)# keV 94(27) µs 9+# 165Ir 77 88 164.98752(23)# 164Os 1/2+# α (드묾) 161Re 165mIr 180(50)# keV 300(60) µs p (87%) 164Os 11/2- α (13%) 161Re 166Ir 77 89 165.98582(22)# 10.5(22) ms α (93%) 162Re (2-) p (7%) 165Os 166mIr 172(6) keV 15.1(9) ms α (98.2%) 162Re (9+) p (1.8%) 165Os 167Ir 77 90 166.981665(20) 35.2(20) ms α (48%) 163Re 1/2+ p (32%) 166Os β+ (20%) 167Os 167mIr 175.3(22) keV 30.0(6) ms α (80%) 163Re 11/2- β+ (20%) 167Os p (0.4%) 166Os 168Ir 77 91 167.97988(16)# 161(21) ms α 164Re high β+ (드묾) 168Os 168mIr 50(100)# keV 125(40) ms α 164Re low 169Ir 77 92 168.976295(28) 780(360) ms0.64(+46-24) s α 165Re 1/2+# β+ (드묾) 169Os 169mIr 154(24) keV 308(22) ms α (72%) 165Re 11/2-# β+ (28%) 169Os 170Ir 77 93 169.97497(11)# 910(150) ms0.87(+18-12) s β+ (64%) 170Os low# α (36%) 166Re 170mIr 270(70)# keV 440(60) ms high# 171Ir 77 94 170.97163(4) 3.6(10) s3.2(+13-7) s α (58%) 167Re 1/2+# β+ (42%) 171Os 171mIr 180(30)# keV 1.40(10) s (11/2-) 172Ir 77 95 171.97046(11)# 4.4(3) s β+ (98%) 172Os (3+) α (2%) 168Re 172mIr 280(100)# keV 2.0(1) s β+ (77%) 172Os (7+) α (23%) 168Re 173Ir 77 96 172.967502(15) 9.0(8) s β+ (93%) 173Os (3/2+,5/2+) α (7%) 169Re 173mIr 253(27) keV 2.20(5) s β+ (88%) 173Os (11/2-) α (12%) 169Re 174Ir 77 97 173.966861(30) 7.9(6) s β+ (99.5%) 174Os (3+) α (0.5%) 170Re 174mIr 193(11) keV 4.9(3) s β+ (99.53%) 174Os (7+) α (0.47%) 170Re 175Ir 77 98 174.964113(21) 9(2) s β+ (99.15%) 175Os (5/2-) α (0.85%) 171Re 176Ir 77 99 175.963649(22) 8.3(6) s β+ (97.9%) 176Os α (2.1%) 172Re 177Ir 77 100 176.961302(21) 30(2) s β+ (99.94%) 177Os 5/2- α (0.06%) 173Re 178Ir 77 101 177.961082(21) 12(2) s β+ 178Os 179Ir 77 102 178.959122(12) 79(1) s β+ 179Os (5/2)- 180Ir 77 103 179.959229(23) 1.5(1) min β+ 180Os (4,5)(+#) 181Ir 77 104 180.957625(28) 4.90(15) min β+ 181Os (5/2)- 182Ir 77 105 181.958076(23) 15(1) min β+ 182Os (3+) 183Ir 77 106 182.956846(27) 57(4) min β+ (99.95%) 183Os 5/2- α (0.05%) 179Re 184Ir 77 107 183.95748(3) 3.09(3) h β+ 184Os 5- 184m1Ir 225.65(11) keV 470(30) µs 3+ 184m2Ir 328.40(24) keV 350(90) ns (7)+ 185Ir 77 108 184.95670(3) 14.4(1) h β+ 185Os 5/2- 186Ir 77 109 185.957946(18) 16.64(3) h β+ 186Os 5+ 186mIr 0.8(4) keV 1.92(5) h β+ 186Os 2- IT (드묾) 186Ir 187Ir 77 110 186.957363(7) 10.5(3) h β+ 187Os 3/2+ 187m1Ir 186.15(4) keV 30.3(6) ms IT 187Ir 9/2- 187m2Ir 433.81(9) keV 152(12) ns 11/2- 188Ir 77 111 187.958853(8) 41.5(5) h β+ 188Os 1- 188mIr 970(30) keV 4.2(2) ms IT 188Ir 7+# β+ (드묾) 188Os 189Ir 77 112 188.958719(14) 13.2(1) d ε 189Os 3/2+ 189m1Ir 372.18(4) keV 13.3(3) ms IT 189Ir 11/2- 189m2Ir 2333.3(4) keV 3.7(2) ms (25/2)+ 190Ir 77 113 189.9605460(18) 11.78(10) d β+ 190Os 4- 190m1Ir 26.1(1) keV 1.120(3) h IT 190Ir (1-) 190m2Ir 36.154(25) keV >2 µs (4)+ 190m3Ir 376.4(1) keV 3.087(12) h (11)- 191Ir 77 114 190.9605940(18) 안정 3/2+ 0.373(2) 191m1Ir 171.24(5) keV 4.94(3) s IT 191Ir 11/2- 191m2Ir 2120(40) keV 5.5(7) s 192Ir 77 115 191.9626050(18) 73.827(13) d β- (95.24%) 192Pt 4+ ε (4.76%) 192Os 192m1Ir 56.720(5) keV 1.45(5) min 1- 192m2Ir 168.14(12) keV 241(9) a (11-) 193Ir 77 116 192.9629264(18) 안정 3/2+ 0.627(2) 193mIr 80.240(6) keV 10.53(4) d IT 193Ir 11/2- 194Ir 77 117 193.9650784(18) 19.28(13) h β- 194Pt 1- 194m1Ir 147.078(5) keV 31.85(24) ms IT 194Ir (4+) 194m2Ir 370(70) keV 171(11) d (10,11)(-#) 195Ir 77 118 194.9659796(18) 2.5(2) h β- 195Pt 3/2+ 195mIr 100(5) keV 3.8(2) h β- (95%) 195Pt 11/2- IT (5%) 195Ir 196Ir 77 119 195.96840(4) 52(1) s β- 196Pt (0-) 196mIr 210(40) keV 1.40(2) h β- (99.7%) 196Pt (10,11-) IT 196Ir 197Ir 77 120 196.969653(22) 5.8(5) min β- 197Pt 3/2+ 197mIr 115(5) keV 8.9(3) min β- (99.75%) 197Pt 11/2- IT (0.25%) 197Ir 198Ir 77 121 197.97228(21)# 8(1) s β- 198Pt 199Ir 77 122 198.97380(4) 20# s β- 199Pt 3/2+# 동위 원소 분류:원소별 동위 원소 목록