Постојат два природни изотопи на иридиумот (77Ir) и 37 радиоизотопи, од кои најстабилен радиоизотоп е 192Ir со време на полураспад од 73,83 дена и многу јадрени изомери, од кои најстабилниот е 192 m2 Ir со време на полураспад од 241 година. Сите други изомери имаат време на полураспад под една година, најмногу под еден ден. Сите изотопи на иридиум се или радиоактивни или набљудувачки стабилни, што значи дека се предвидува дека се радиоактивни, но не е забележано вистинско распаѓање.
Список на изотопи
|-id=Иридиум-164 | 164Ir | style="text-align:right" | 77 | style="text-align:right" | 87 | 163,99220(44)# | <0,5 μs | p? | 163Os | 2−#
|-id=Иридиум-164m | 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 |-id=Иридиум-165 | 165Ir | style="text-align:right" | 77 | style="text-align:right" | 88 | 164,98752(23)# | | p | 164Os | (1/2+)
|-id=Иридиум-165m | 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 |-id=Иридиум-166 | 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 |-id=Иридиум-166m | 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 |-id=Иридиум-167 | 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 |-id=Иридиум-167m | 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 |-id=Иридиум-168 | 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 |-id=Иридиум-168m | style="text-indent:1em" | 168mIr | colspan="3" style="text-indent:2em" | 50(100)# keV | 125(40) ms | α | 164Re | (9+)
|-id=Иридиум-169 | 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[] | α | 165Re | rowspan=2|(1/2+) | rowspan=2| | rowspan=2| |- | β+ (rare) | 169Os |-id=Иридиум-169m | 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 |-id=Иридиум-170 | 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[] | β+ (64%) | 170Os | rowspan=2|low# | rowspan=2| | rowspan=2| |- | α (36%) | 166Re |-id=Иридиум-170m | 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 |-id=Иридиум-171 | 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[] | α (58%) | 167Re | rowspan=2|1/2+ | rowspan=2| | rowspan=2| |- | β+ (42%) | 171Os |-id=Иридиум-171m | style="text-indent:1em" | 171mIr | colspan="3" style="text-indent:2em" | 180(30)# keV | 1,40(10) s
| (11/2−)
|-id=Иридиум-172 | 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 |-id=Иридиум-172m | 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 |-id=Иридиум-173 | 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 |-id=Иридиум-173m | 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 |-id=Иридиум-174 | 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 |-id=Иридиум-174m | 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 |-id=Иридиум-175 | 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 |-id=Иридиум-176 | 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 |-id=Иридиум-177 | 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 |-id=Иридиум-178 | 178Ir | style="text-align:right" | 77 | style="text-align:right" | 101 | 177,961082(21) | 12(2) s | β+ | 178Os
|-id=Иридиум-179 | 179Ir | style="text-align:right" | 77 | style="text-align:right" | 102 | 178,959122(12) | 79(1) s | β+ | 179Os | (5/2)−
|-id=Иридиум-180 | 180Ir | style="text-align:right" | 77 | style="text-align:right" | 103 | 179,959229(23) | 1,5(1) min | β+ | 180Os | (4,5)(+#)
|-id=Иридиум-181 | 181Ir | style="text-align:right" | 77 | style="text-align:right" | 104 | 180,957625(28) | 4,90(15) min | β+ | 181Os | (5/2)−
|-id=Иридиум-182 | 182Ir | style="text-align:right" | 77 | style="text-align:right" | 105 | 181,958076(23) | 15(1) min | β+ | 182Os | (3+)
|-id=Иридиум-183 | 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 |-id=Иридиум-184 | 184Ir | style="text-align:right" | 77 | style="text-align:right" | 107 | 183,95748(3) | 3,09(3) h | β+ | 184Os | 5−
|-id=Иридиум-184m1 | style="text-indent:1em" | 184m1Ir | colspan="3" style="text-indent:2em" | 225,65(11) keV | 470(30) μs
| 3+
|-id=Иридиум-184m2 | style="text-indent:1em" | 184m2Ir | colspan="3" style="text-indent:2em" | 328,40(24) keV | 350(90) ns
| (7)+
|-id=Иридиум-185 | 185Ir | style="text-align:right" | 77 | style="text-align:right" | 108 | 184,95670(3) | 14,4(1) h | β+ | 185Os | 5/2−
|-id=Иридиум-186 | 186Ir | style="text-align:right" | 77 | style="text-align:right" | 109 | 185,957946(18) | 16,64(3) h | β+ | 186Os | 5+
|-id=Иридиум-186m | 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 (ретко) | 186Ir |-id=Иридиум-187 | 187Ir | style="text-align:right" | 77 | style="text-align:right" | 110 | 186,957363(7) | 10,5(3) h | β+ | 187Os | 3/2+
|-id=Иридиум-187m1 | style="text-indent:1em" | 187m1Ir | colspan="3" style="text-indent:2em" | 186,15(4) keV | 30,3(6) ms | IT | 187Ir | 9/2−
|-id=Иридиум-187m2 | style="text-indent:1em" | 187m2Ir | colspan="3" style="text-indent:2em" | 433,81(9) keV | 152(12) ns
| 11/2−
|-id=Иридиум-188 | 188Ir | style="text-align:right" | 77 | style="text-align:right" | 111 | 187,958853(8) | 41,5(5) h | β+ | 188Os | 1−
|-id=Иридиум-188m | 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 |-id=Иридиум-189 | 189Ir | style="text-align:right" | 77 | style="text-align:right" | 112 | 188,958719(14) | 13,2(1) d | EC | 189Os | 3/2+
|-id=Иридиум-189m1 | style="text-indent:1em" | 189m1Ir | colspan="3" style="text-indent:2em" | 372,18(4) keV | 13,3(3) ms | IT | 189Ir | 11/2−
|-id=Иридиум-189m2 | style="text-indent:1em" | 189m2Ir | colspan="3" style="text-indent:2em" | 2333,3(4) keV | 3,7(2) ms
| (25/2)+
|-id=Иридиум-190 | rowspan=2|190Ir | rowspan=2 style="text-align:right" | 77 | rowspan=2 style="text-align:right" | 113 | rowspan=2|189,9605460(18) | rowspan=2|11,7511(20) d | EC | rowspan=2|190Os | rowspan=2|4− | rowspan=2 | |- | β+ (<0,002%) |-id=Иридиум-190m1 | style="text-indent:1em" | 190m1Ir | colspan="3" style="text-indent:2em" | 26,1(1) keV | 1,120(3) h | IT | 190Ir | (1)−
|-id=Иридиум-190m2 | style="text-indent:1em" | 190m2Ir | colspan="3" style="text-indent:2em" | 36,154(25) keV | >2 μs
| (4)+
|-id=Иридиум-190m3 | rowspan=2 style="text-indent:1em" | 190m3Ir | rowspan=2 colspan=3 style="text-indent:2em" | 376,4(1) keV | rowspan=2|3,087(12) h | EC (91,4%) | 190Os | rowspan=2|(11)− | rowspan=2| | rowspan=2| |- | IT (8,6%) | 190Ir |-id=Иридиум-191 | 191Ir | style="text-align:right" | 77 | style="text-align:right" | 114 | 190,9605940(18) | colspan=3 align=center|Опсервациски стабиленСе верува дека подлежи на α распаѓање до 187Re | 3/2+ | 0,373(2) | |-id=Иридиум-191m1 | style="text-indent:1em" | 191m1Ir | colspan="3" style="text-indent:2em" | 171,24(5) keV | 4,94(3) s | IT | 191Ir | 11/2−
|-id=Иридиум-191m2 | 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 |-id=Иридиум-192m1 | 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 |-id=Иридиум-192m2 | style="text-indent:1em" | 192m2Ir | colspan="3" style="text-indent:2em" | 168,14(12) keV | 241(9) y | IT | 192Ir | (11−)
|-id=Иридиум-193 | 193Ir | style="text-align:right" | 77 | style="text-align:right" | 116 | 192,9629264(18) | colspan=3 align=center|Опсервациски стабиленСе верува дека подлежи на α распаѓање до 189Re | 3/2+ | 0,627(2) | |-id=Иридиум-193m | style="text-indent:1em" | 193mIr | colspan="3" style="text-indent:2em" | 80,240(6) keV | 10,53(4) d | IT | 193Ir | 11/2−
|-id=Иридиум-194 | 194Ir | style="text-align:right" | 77 | style="text-align:right" | 117 | 193,9650784(18) | 19,28(13) h | β− | 194Pt | 1−
|-id=Иридиум-194m1 | style="text-indent:1em" | 194m1Ir | colspan="3" style="text-indent:2em" | 147,078(5) keV | 31,85(24) ms | IT | 194Ir | (4+)
|-id=Иридиум-194m2 | style="text-indent:1em" | 194m2Ir | colspan="3" style="text-indent:2em" | 370(70) keV | 171(11) d
| (10,11)(−#)
|-id=Иридиум-195 | 195Ir | style="text-align:right" | 77 | style="text-align:right" | 118