Isotopes of iridium#Iridium-187

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.{{cite journal |last1=Belli |first1=P. |last2=Bernabei |first2=R. |last3=Danevich |first3=F. A. |last4=Incicchitti |first4=A. |last5=Tretyak |first5=V. I. |display-authors=3 |title=Experimental searches for rare alpha and beta decays |journal=European Physical Journal A |date=2019 |volume=55 |issue=8 |pages=140–1–140–7 |doi=10.1140/epja/i2019-12823-2 |issn=1434-601X |arxiv=1908.11458|bibcode=2019EPJA...55..140B |s2cid=201664098 }}

List of isotopes

{{Anchor|Iridium-163|Iridium-176m|Iridium-177m1|Iridium-177m2|Iridium-199m}}

{{Isotopes table

| symbol = Ir

| refs = NUBASE2020, AME2020 II

| notes = m, unc(), mass#, exen#, spin(), hl#, spin#, daughter-st, daughter-nst, A, B+, B-, EC, IT, p

}}

|-id=Iridium-164

| ¹⁶⁴IrDiscovery of this isotope is unconfirmed{{cite journal |last1=Drummond |first1=M. C. |last2=O'Donnell |first2=D. |last3=Page |first3=R. D. |last4=Joss |first4=D. T. |last5=Capponi |first5=L. |last6=Cox |first6=D. M. |last7=Darby |first7=I. G. |last8=Donosa |first8=L. |last9=Filmer |first9=F. |last10=Grahn |first10=T. |last11=Greenlees |first11=P. T. |last12=Hauschild |first12=K. |last13=Herzan |first13=A. |last14=Jakobsson |first14=U. |last15=Jones |first15=P. M. |last16=Julin |first16=R. |last17=Juutinen |first17=S. |last18=Ketelhut |first18=S. |last19=Leino |first19=M. |last20=Lopez-Martens |first20=A. |last21=Mistry |first21=A. K. |last22=Nieminen |first22=P. |last23=Peura |first23=P. |last24=Rahkila |first24=P. |last25=Rinta-Antila |first25=S. |last26=Ruotsalainen |first26=P. |last27=Sandzelius |first27=M. |last28=Sarén |first28=J. |last29=Sayğı |first29=B. |last30=Scholey |first30=C. |last31=Simpson |first31=J. |last32=Sorri |first32=J. |last33=Thornthwaite |first33=A. |last34=Uusitalo |first34=J. |title=α decay of the π h 11 / 2 isomer in Ir 164 |journal=Physical Review C |date=16 June 2014 |volume=89 |issue=6 |page=064309 |doi=10.1103/PhysRevC.89.064309 |bibcode=2014PhRvC..89f4309D |url=https://journals.aps.org/prc/pdf/10.1103/PhysRevC.89.064309 |access-date=21 June 2023 |language=en |issn=0556-2813}}

| style="text-align:right" | 77

| style="text-align:right" | 87

| 163.99197(34)#

| <0.5 μs

| p?

| ¹⁶³Os

| 2−#

|-id=Iridium-164m

| rowspan=2 style="text-indent:1em" | ^164mIr

| rowspan=2 colspan="3" style="text-indent:2em" | 260(100)# keV

| rowspan=2| 70(10) μs

| p (96%)

| ¹⁶³Os

| rowspan=2| (9+)

| rowspan=2|

| α (4%)

| ^160mRe

|-id=Iridium-165

| ¹⁶⁵Ir

| style="text-align:right" | 77

| style="text-align:right" | 88

| 165.98572(22)#

| {{val|1.20|0.82|0.74|u=μs}}{{cite web |last1=Hilton |first1=Joshua Ben |title=Decays of new nuclides 169Au, 170Hg, 165Pt and the ground state of 165Ir discovered using MARA |url=https://www.proquest.com/docview/2448649087 |publisher=University of Liverpool |access-date=21 June 2023|id={{ProQuest|2448649087}} }}

| p

| ¹⁶⁴Os

| (1/2+)

|-id=Iridium-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|

| α (12%)

| ^161mRe

|-id=Iridium-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|

| p (7%)

| ¹⁶⁵Os

|-id=Iridium-166m

| rowspan=2 style="text-indent:1em" | ^166mIr

| rowspan=2 colspan="3" style="text-indent:2em" | 171(6) keV

| rowspan=2|15.1(9) ms

| α (98.2%)

| ¹⁶²Re

| rowspan=2|(9)+

| rowspan=2|

| p (1.8%)

| ¹⁶⁵Os

|-id=Iridium-167

| rowspan=3|¹⁶⁷Ir

| rowspan=3 style="text-align:right" | 77

| rowspan=3 style="text-align:right" | 90

| rowspan=3|166.981672(20)

| rowspan=3|29.3(6) ms

| α (43.5%)

| ¹⁶³Re

| rowspan=3|1/2+

| rowspan=3|

| p (38.6%)

| ¹⁶⁶Os

| β⁺ (17.9%)

| ¹⁶⁷Os

|-id=Iridium-167m

| rowspan=3 style="text-indent:1em" | ^167mIr

| rowspan=3 colspan="3" style="text-indent:2em" | 175.5(21) keV

| rowspan=3|28.5(5) ms

| α (89%)

| ¹⁶³Re

| rowspan=3|11/2−

| rowspan=3|

| β⁺ (11%)

| ¹⁶⁷Os

| p (0.41%)

| ¹⁶⁶Os

|-id=Iridium-168

| ¹⁶⁸Ir

| style="text-align:right" | 77

| style="text-align:right" | 91

| 167.979961(59)

| 230(50) ms

| α

| ¹⁶⁴Re

| (2)-

|-id=Iridium-168m

| rowspan=3 style="text-indent:1em" | ^168mIrOrder of ground state and isomer is uncertain.

| rowspan=3 colspan="3" style="text-indent:2em" | 40(250) keV

| rowspan=3|163(16) ms

| α (77%)

| ¹⁶⁴Re

| rowspan=3|(9,10)+

| rowspan=3|

| β⁺?

| ¹⁶⁸Os

| β⁺, p?

| ¹⁶⁷Re

|-id=Iridium-169

| rowspan=2|¹⁶⁹Ir

| rowspan=2 style="text-align:right" | 77

| rowspan=2 style="text-align:right" | 92

| rowspan=2|168.976282(25)

| rowspan=2|353(4) ms

| α (53%)

| ¹⁶⁵Re

| rowspan=2|(1/2+)

| rowspan=2|

| β⁺ (47%)

| ¹⁶⁹Os

|-id=Iridium-169m

| rowspan=3 style="text-indent:1em" | ^169mIr

| rowspan=3 colspan="3" style="text-indent:2em" | 153(22) keV

| rowspan=3|280(1) ms

| α (79%)

| ¹⁶⁵Re

| rowspan=3|(11/2−)

| rowspan=3|

| β⁺?

| ¹⁶⁹Os

| p?

| ¹⁶⁸Os

|-id=Iridium-170

| rowspan=2|¹⁷⁰Ir

| rowspan=2 style="text-align:right" | 77

| rowspan=2 style="text-align:right" | 93

| rowspan=2|169.97511(11)#

| rowspan=2|910(150) ms

| β⁺ (94.8%)

| ¹⁷⁰Os

| rowspan=2|(3−)

| rowspan=2|

| α (5.2%)

| ¹⁶⁶Re

|-id=Iridium-170m

| rowspan=3 style="text-indent:1em" | ^170mIr

| rowspan=3 colspan="3" style="text-indent:2em" | 40(50)# keV

| rowspan=3|811(18) ms

| α (38%)

| ¹⁶⁶Re

| rowspan=3|(8+)

| rowspan=3|

| β⁺?

| ¹⁷⁰Os

| IT?

| ¹⁷⁰Ir

|-id=Iridium-171

| rowspan=2|¹⁷¹Ir

| rowspan=2 style="text-align:right" | 77

| rowspan=2 style="text-align:right" | 94

| rowspan=2|170.971646(41)

| rowspan=2|3.1(3) s

| β⁺ (85%)

| ¹⁷¹Os

| rowspan=2|1/2+

| rowspan=2|

| α (15%)

| ¹⁶⁷Re

|-id=Iridium-171m

| rowspan=3 style="text-indent:1em" | ^171mIr

| rowspan=3 colspan="3" style="text-indent:2em" | 164(11)# keV

| rowspan=3|1.47(6) s

| α (54%)

| ¹⁶⁷Re

| rowspan=3|(11/2−)

| rowspan=3|

| β⁺?

| ¹⁷¹Os

| p?

| ¹⁷⁰Os

|-id=Iridium-172

| rowspan=2|¹⁷²Ir

| rowspan=2 style="text-align:right" | 77

| rowspan=2 style="text-align:right" | 95

| rowspan=2|171.970607(35)

| rowspan=2|4.4(3) s

| β⁺ (~98%)

| ¹⁷²Os

| rowspan=2|(3−,4−)

| rowspan=2|

| α (~2%)

| ¹⁶⁸Re

|-id=Iridium-172m

| rowspan=2 style="text-indent:1em" | ^172mIr

| rowspan=2 colspan="3" style="text-indent:2em" | 139(10) keV

| rowspan=2|2.19(7) s

| β⁺ (90.5%)

| ¹⁷²Os

| rowspan=2|(7+)

| rowspan=2|

| α (9.5%)

| ¹⁶⁸Re

|-id=Iridium-173

| rowspan=2|¹⁷³Ir

| rowspan=2 style="text-align:right" | 77

| rowspan=2 style="text-align:right" | 96

| rowspan=2|172.967505(11)

| rowspan=2|9.0(8) s

| β⁺ (96.5%)

| ¹⁷³Os

| rowspan=2|(1/2+,3/2+)

| rowspan=2|

| α (3.5%)

| ¹⁶⁹Re

|-id=Iridium-173m

| rowspan=2 style="text-indent:1em" | ^173mIr

| rowspan=2 colspan="3" style="text-indent:2em" | 226(9) keV

| rowspan=2|2.20(5) s

| β⁺ (88%)

| ¹⁷³Os

| rowspan=2|11/2−

| rowspan=2|

| α (12%)

| ¹⁶⁹Re

|-id=Iridium-174

| rowspan=2|¹⁷⁴Ir

| rowspan=2 style="text-align:right" | 77

| rowspan=2 style="text-align:right" | 97

| rowspan=2|173.966950(12)

| rowspan=2|7.9(6) s

| β⁺ (99.5%)

| ¹⁷⁴Os

| rowspan=2|(2+,3−)

| rowspan=2|

| α (0.5%)

| ¹⁷⁰Re

|-id=Iridium-174m

| rowspan=2 style="text-indent:1em" | ^174mIr

| rowspan=2 colspan="3" style="text-indent:2em" | 124(16) keV

| rowspan=2|4.9(3) s

| β⁺ (97.5%)

| ¹⁷⁴Os

| rowspan=2|(6,7,8,9)

| rowspan=2|

| α (2.5%)

| ¹⁷⁰Re

|-id=Iridium-175

| rowspan=2|¹⁷⁵Ir

| rowspan=2 style="text-align:right" | 77

| rowspan=2 style="text-align:right" | 98

| rowspan=2|174.964150(13)

| rowspan=2|9(2) s

| β⁺ (99.15%)

| ¹⁷⁵Os

| rowspan=2|(1/2+)

| rowspan=2|

| α (0.85%)

| ¹⁷¹Re

|-id=Iridium-175m1

| style="text-indent:1em" | ^175m1Ir

| colspan="3" style="text-indent:2em" | 50(40)# keV

| 33(4) s

| β⁺

| ¹⁷⁵Os

| 9/2−#

|-id=Iridium-175m2

| style="text-indent:1em" | ^175m2Ir

| colspan="3" style="text-indent:2em" | 97.4(7) keV

| 6.58(15) μs

| IT

| ¹⁷⁵Ir

| (5/2−)

|-id=Iridium-176

| rowspan=2|¹⁷⁶Ir

| rowspan=2 style="text-align:right" | 77

| rowspan=2 style="text-align:right" | 99

| rowspan=2|175.9636263(87)

| rowspan=2|8.7(5) s

| β⁺ (96.9%)

| ¹⁷⁶Os

| rowspan=2|(3+)

| rowspan=2|

| α (3.1%)

| ¹⁷²Re

|-id=Iridium-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|29.8(17) s

| β⁺ (99.94%)

| ¹⁷⁷Os

| rowspan=2|5/2−

| rowspan=2|

| α (0.06%)

| ¹⁷³Re

|-id=Iridium-177m

| style="text-indent:1em" | ^177mIr

| colspan="3" style="text-indent:2em" | 180.9(4) keV

| >100 ns

| IT

| ¹⁷⁷Ir

| (5/2+)

|-id=Iridium-178

| ¹⁷⁸Ir

| style="text-align:right" | 77

| style="text-align:right" | 101

| 177.961079(20)

| 12(2) s

| β⁺

| ¹⁷⁸Os

| 3+#

|-id=Iridium-179

| ¹⁷⁹Ir

| style="text-align:right" | 77

| style="text-align:right" | 102

| 178.959118(10)

| 79(1) s

| β⁺

| ¹⁷⁹Os

| (5/2)−

|-id=Iridium-180

| ¹⁸⁰Ir

| style="text-align:right" | 77

| style="text-align:right" | 103

| 179.959229(23)

| 1.5(1) min

| β⁺

| ¹⁸⁰Os

| (5+)

|-id=Iridium-181

| ¹⁸¹Ir

| style="text-align:right" | 77

| style="text-align:right" | 104

| 180.9576347(56)

| 4.90(15) min

| β⁺

| ¹⁸¹Os

| 5/2−

|-id=Iridium-181m1

| style="text-indent:1em" | ^181m1Ir

| colspan="3" style="text-indent:2em" | 289.33(13) keV

| 298 ns

| IT

| ¹⁸¹Ir

| 5/2+

|-id=Iridium-181m2

| style="text-indent:1em" | ^181m2Ir

| colspan="3" style="text-indent:2em" | 366.30(22) keV

| 126(6) ns

| IT

| ¹⁸¹Ir

| 9/2−

|-id=Iridium-182

| ¹⁸²Ir

| style="text-align:right" | 77

| style="text-align:right" | 105

| 181.958076(23)

| 15.0(10) min

| β⁺

| ¹⁸²Os

| 3+

|-id=Iridium-182m1

| style="text-indent:1em" | ^182m1Ir

| colspan="3" style="text-indent:2em" | 71.02(17) keV

| 170(40) ns

| IT

| ¹⁸²Ir

| (5)+

|-id=Iridium-182m2

| style="text-indent:1em" | ^182m2Ir

| colspan="3" style="text-indent:2em" | 176.4(3) keV

| 130(50) ns

| IT

| ¹⁸²Ir

| (6−)

|-id=Iridium-183

| ¹⁸³Ir

| rstyle="text-align:right" | 77

| style="text-align:right" | 106

| 182.956841(26)

| 58(5) min

| β⁺

| ¹⁸³Os

| 5/2−

|-id=Iridium-184

| ¹⁸⁴Ir

| style="text-align:right" | 77

| style="text-align:right" | 107

| 183.957476(30)

| 3.09(3) h

| β⁺

| ¹⁸⁴Os

| 5−

|-id=Iridium-184m1

| style="text-indent:1em" | ^184m1Ir

| colspan="3" style="text-indent:2em" | 225.65(11) keV

| 470(30) μs

| IT

| ¹⁸⁴Ir

| 3+

|-id=Iridium-184m2

| style="text-indent:1em" | ^184m2Ir

| colspan="3" style="text-indent:2em" | 328.40(24) keV

| 350(90) ns

| IT

| ¹⁸⁴Ir

| 7+

|-id=Iridium-185

| ¹⁸⁵Ir

| style="text-align:right" | 77

| style="text-align:right" | 108

| 184.956698(30)

| 14.4(1) h

| β⁺

| ¹⁸⁵Os

| 5/2−

|-id=Iridium-185m

| style="text-indent:1em" | ^185mIr

| colspan="3" style="text-indent:2em" | 2197(23) keV

| 120(20) ns

| IT

| ¹⁸⁵Ir

| (23/2,25/2)#

|-id=Iridium-186

| ¹⁸⁶Ir

| style="text-align:right" | 77

| style="text-align:right" | 109

| 185.957947(18)

| 16.64(3) h

| β⁺

| ¹⁸⁶Os

| 5+

|-id=Iridium-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⁺ (~75%)

| ¹⁸⁶Os

| rowspan=2|2−

| rowspan=2|

| IT (~25%)

| ¹⁸⁶Ir

|-id=Iridium-187

| ¹⁸⁷Ir

| style="text-align:right" | 77

| style="text-align:right" | 110

| 186.957542(30)

| 10.5(3) h

| β⁺

| ¹⁸⁷Os

| 3/2+

|-id=Iridium-187m1

| style="text-indent:1em" | ^187m1Ir

| colspan="3" style="text-indent:2em" | 186.16(4) keV

| 30.3(6) ms

| IT

| ¹⁸⁷Ir

| 9/2−

|-id=Iridium-187m2

| style="text-indent:1em" | ^187m2Ir

| colspan="3" style="text-indent:2em" | 433.75(6) keV

| 152(12) ns

| IT

| ¹⁸⁷Ir

| 11/2−

|-id=Iridium-187m3

| style="text-indent:1em" | ^187m3Ir

| colspan="3" style="text-indent:2em" | 2487.7(4) keV

| 1.8(5) μs

| IT

| ¹⁸⁷Ir

| 29/2−

|-id=Iridium-188

| ¹⁸⁸Ir

| style="text-align:right" | 77

| style="text-align:right" | 111

| 187.958835(10)

| 41.5(5) h

| β⁺

| ¹⁸⁸Os

| 1−

|-id=Iridium-188m

| style="text-indent:1em" | ^188mIr

| colspan="3" style="text-indent:2em" | 964(23) keV

| 4.15(15) ms

| IT

| ¹⁸⁸Ir

| 11−#

|-id=Iridium-189

| ¹⁸⁹Ir

| style="text-align:right" | 77

| style="text-align:right" | 112

| 188.958723(14)

| 13.2(1) d

| EC

| ¹⁸⁹Os

| 3/2+

|-id=Iridium-189m1

| style="text-indent:1em" | ^189m1Ir

| colspan="3" style="text-indent:2em" | 372.17(4) keV

| 13.3(3) ms

| IT

| ¹⁸⁹Ir

| 11/2−

|-id=Iridium-189m2

| style="text-indent:1em" | ^189m2Ir

| colspan="3" style="text-indent:2em" | 2332.8(3) keV

| 3.7(2) ms

| IT

| ¹⁸⁹Ir

| 25/2+

|-id=Iridium-190

| rowspan=2|¹⁹⁰Ir

| rowspan=2 style="text-align:right" | 77

| rowspan=2 style="text-align:right" | 113

| rowspan=2|189.9605434(15)

| rowspan=2|11.7511(20) d{{cite journal |first1=Ł. |last1=Janiak |first2=M. |last2=Gierlik |first3=T. |last3=Kosinski |first4=M. |last4=Matusiak |first5=G. |last5=Madejowski |first6=S. |last6=Wronka |first7=J. |last7=Rzadkiewicz |title=Half-life of ¹⁹⁰Ir |date=2024 |journal=Physical Review C |volume=110 |number=014306 |doi=10.1103/PhysRevC.110.014306}}

| EC

| rowspan=2|¹⁹⁰Os

| rowspan=2|4−

| rowspan=2 |

| β⁺ (<0.002%)

|-id=Iridium-190m1

| style="text-indent:1em" | ^190m1Ir

| colspan="3" style="text-indent:2em" | 26.1(1) keV

| 1.120(3) h

| IT

| ¹⁹⁰Ir

| 1−

|-id=Iridium-190m2

| style="text-indent:1em" | ^190m2Ir

| colspan="3" style="text-indent:2em" | 36.154(25) keV

| >2 μs

| IT

| ¹⁹⁰Ir

| 4+

|-id=Iridium-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|

| IT (8.6%)

| ¹⁹⁰Ir

|-id=Iridium-191

| ¹⁹¹Ir

| style="text-align:right" | 77

| style="text-align:right" | 114

| 190.9605915(14)

| colspan=3 align=center|Observationally Stable{{refn|group="n"|Believed to undergo α decay to ¹⁸⁷Re{{cite journal |last1=Danevich |first1=F. A. |last2=Andreotti |first2=E. |last3=Hult |first3=M. |last4=Marissens |first4=G. |last5=Tretyak |first5=V. I. |last6=Yuksel |first6=A. |title=Search for α decay of ¹⁵¹Eu to the first excited level of ¹⁴⁷Pm using underground γ-ray spectrometry |journal = European Physical Journal A |volume=48 |number=157 |date=2012 |page=157 |doi=10.1140/epja/i2012-12157-7|arxiv=1301.3465 |bibcode=2012EPJA...48..157D |s2cid=118657922 }}{{cite journal |last1=Belli |first1=P. |last2=Bernabei |first2=R. |last3=Danevich |first3=F. A. |last4=Incicchitti |first4=A. |last5=Tretyak |first5=V. I. |display-authors=3 |title=Experimental searches for rare alpha and beta decays |journal=European Physical Journal A |date=2019 |volume=55 |issue=8 |pages=140–1–140–7 |doi=10.1140/epja/i2019-12823-2 |issn=1434-601X |arxiv=1908.11458|bibcode=2019EPJA...55..140B |s2cid=201664098 }}}}

| 3/2+

| 0.373(2)

|-id=Iridium-191m1

| style="text-indent:1em" | ^191m1Ir

| colspan="3" style="text-indent:2em" | 171.29(4) keV

| 4.899(23) s

| IT

| ¹⁹¹Ir

| 11/2−

|-id=Iridium-191m2

| style="text-indent:1em" | ^191m2Ir

| colspan="3" style="text-indent:2em" | 2101.0(9) keV

| 5.7(4) s

| IT

| ¹⁹¹Ir

| 31/2(+)

| rowspan=2|¹⁹²Ir

| rowspan=2 style="text-align:right" | 77

| rowspan=2 style="text-align:right" | 115

| rowspan=2|191.9626024(14)

| rowspan=2|73.820(14) d

| β⁻ (95.24%)

| ¹⁹²Pt

| rowspan=2|4+

| rowspan=2|

| EC (4.76%)

| ¹⁹²Os

|-id=Iridium-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 (99.98%)

| ¹⁹²Ir

| rowspan=2|1−

| rowspan=2|

| β⁻ (0.0175%)

| ¹⁹²Pt

|-id=Iridium-192m2

| style="text-indent:1em" | ^192m2Ir

| colspan="3" style="text-indent:2em" | 168.14(12) keV

| 241(9) y

| IT

| ¹⁹²Ir

| (11−)

|-id=Iridium-193

| ¹⁹³Ir

| style="text-align:right" | 77

| style="text-align:right" | 116

| 192.9629238(14)

| colspan=3 align=center|Observationally Stable{{refn|group="n"|Believed to undergo α decay to ¹⁸⁹Re}}

| 3/2+

| 0.627(2)

|-id=Iridium-193m1

| style="text-indent:1em" | ^193m1Ir

| colspan="3" style="text-indent:2em" | 80.238(6) keV

| 10.53(4) d

| IT

| ¹⁹³Ir

| 11/2−

|-id=Iridium-193m2

| style="text-indent:1em" | ^193m2Ir

| colspan="3" style="text-indent:2em" | 2278.9(5) keV

| 124.8(21) μs

| IT

| ¹⁹³Ir

| 31/2+

|-id=Iridium-194

| ¹⁹⁴Ir

| style="text-align:right" | 77

| style="text-align:right" | 117

| 193.9650757(14)

| 19.35(7) h

| β⁻

| ¹⁹⁴Pt

| 1−

|-id=Iridium-194m1

| style="text-indent:1em" | ^194m1Ir

| colspan="3" style="text-indent:2em" | 147.072(2) keV

| 31.85(24) ms

| IT

| ¹⁹⁴Ir

| 4+

|-id=Iridium-194m2

| style="text-indent:1em" | ^194m2Ir

| colspan="3" style="text-indent:2em" | 370(70) keV

| 171(11) d

| β⁻

| ¹⁹⁴Pt

| (11−)

|-id=Iridium-195

| ¹⁹⁵Ir

| style="text-align:right" | 77

| style="text-align:right" | 118

| 194.9659769(14)

| 2.29(17) h

| β⁻

| ¹⁹⁵Pt

| 3/2+

|-id=Iridium-195m1

| style="text-indent:1em" | ^195m1Ir

| colspan="3" style="text-indent:2em" | 100(5) keV

| 3.74(7) h

| β⁻

| ¹⁹⁵Pt

| 11/2−

|-id=Iridium-195m2

| style="text-indent:1em" | ^195m2Ir

| colspan="3" style="text-indent:2em" | 2354(6) keV

| 4.4(6) μs

| IT

| ¹⁹⁵Ir

| (27/2+)

|-id=Iridium-196

| ¹⁹⁶Ir

| style="text-align:right" | 77

| style="text-align:right" | 119

| 195.968400(41)

| 52.0(11) s

| β⁻

| ¹⁹⁶Pt

| (1,2−)

|-id=Iridium-196m

| style="text-indent:1em" | ^196mIr

| colspan="3" style="text-indent:2em" | 210(40) keV

| 1.40(2) h

| β⁻

| ¹⁹⁶Pt

| 11−#

|-id=Iridium-197

| ¹⁹⁷Ir

| style="text-align:right" | 77

| style="text-align:right" | 120

| 196.969657(22)

| 5.8(5) min

| β⁻

| ¹⁹⁷Pt

| 3/2+

|-id=Iridium-197m1

| style="text-indent:1em" | ^197m1Ir

| colspan="3" style="text-indent:2em" | 115(5) keV

| 8.9(3) min

| β⁻

| ¹⁹⁷Pt

| 11/2−

|-id=Iridium-197m2

| style="text-indent:1em" | ^197m2Ir

| colspan="3" style="text-indent:2em" | 1700(500)# keV

| 30(8) μs

| IT

| ¹⁹⁷Ir

|-id=Iridium-197m3

| style="text-indent:1em" | ^197m3Ir

| colspan="3" style="text-indent:2em" | 2800(500)# keV

| 15(9) μs

| IT

| ¹⁹⁷Ir

|-id=Iridium-198

| ¹⁹⁸Ir

| style="text-align:right" | 77

| style="text-align:right" | 121

| 197.97240(22)#

| 8.7(4) s

| β⁻

| ¹⁹⁸Pt

| 1−

|-id=Iridium-199

| ¹⁹⁹Ir

| style="text-align:right" | 77

| style="text-align:right" | 122

| 198.973807(44)

| 7(5) s

| β⁻

| ¹⁹⁹Pt

| 3/2+#

|-id=Iridium-200

| ²⁰⁰Ir

| style="text-align:right" | 77

| style="text-align:right" | 123

| 199.97684(21)#

| 43(6) s

| β⁻

| ²⁰⁰Pt

| (2−, 3−)

|-id=Iridium-201

| ²⁰¹Ir

| style="text-align:right" | 77

| style="text-align:right" | 124

| 200.97870(22)#

| 21(5) s

| β⁻

| ²⁰¹Pt

| (3/2+)

|-id=Iridium-202

| ²⁰²Ir

| style="text-align:right" | 77

| style="text-align:right" | 125

| 201.98214(32)#

| 11(3) s

| β⁻

| ²⁰²Pt

| (2−)

|-id=Iridium-202m

| style="text-indent:1em" | ^202mIr

| colspan="3" style="text-indent:2em" | 2600(300)# keV

| 3.4(6) μs

| IT

| ²⁰²Ir

|-id=Iridium-203

| ²⁰³Ir

| style="text-align:right" | 77

| style="text-align:right" | 126

| 202.98457(43)#

| 7# s
[>300 ns]

| 3/2+#

|-id=Iridium-203m

| style="text-indent:1em" | ^203mIr

| colspan="3" style="text-indent:2em" | 2140(50)# keV

| 798(350) ns

| IT

| ²⁰³Ir

|-id=Iridium-204

| ²⁰⁴Ir

| style="text-align:right" | 77

| style="text-align:right" | 127

| 203.98973(43)#

| 2# s
[>300 ns]

| 3/2+#

|-id=Iridium-205

| ²⁰⁵Ir

| style="text-align:right" | 77

| style="text-align:right" | 128

| 204.99399(54)#

| 1# s
[>300 ns]

| 3/2+#

Iridium-192

Iridium-192 (symbol ¹⁹²Ir) is a radioactive isotope of iridium, with a half-life of 73.83 days.{{cite web|title=Radioisotope Brief: Iridium-192 (Ir-192)|url=http://emergency.cdc.gov/radiation/isotopes/iridium.asp|access-date=20 March 2012}} 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.{{cite thesis

|last=Baggerly |first=Leo L.

|title=The radioactive decay of Iridium-192 |degree=Ph.D.

|year=1956

|institution=California Institute of Technology

|location=Pasadena, Calif.

|pages=1, 2, 7

|url=https://thesis.library.caltech.edu/750/1/Baggerly_ll_1956.pdf

| doi= 10.7907/26VA-RB25

}} Iridium-192 is normally produced by neutron activation of natural-abundance iridium metal.{{Cite web|url=https://www.isoflex.com/products/radioisotopes/iridium-isotopes|title=Isotope Supplier: Stable Isotopes and Radioisotopes from ISOFLEX - Iridium-192|website=www.isoflex.com|language=en|access-date=2017-10-11}}

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).{{cite conference |last1=Delacroix |first1=D |last2=Guerre |first2=J P |last3=Leblanc |first3=P |last4=Hickman |first4=C |title=Radionuclide and Radiation Protection Data Handbook |journal=Radiation Protection Dosimetry |date=2002 |volume=98 |issue=1 |pages=9–168 |publisher=Nuclear Technology Publishing |location=Ashford, Kent |doi=10.1093/OXFORDJOURNALS.RPD.A006705 |pmid=11916063 |isbn=1870965876 |s2cid=123447679 |edition=2nd |url=https://pdfs.semanticscholar.org/fbb1/7281dae98db83fe20df96b9d879c0c73b199.pdf |archive-url=https://web.archive.org/web/20190822130507/https://pdfs.semanticscholar.org/fbb1/7281dae98db83fe20df96b9d879c0c73b199.pdf |url-status=dead |archive-date=2019-08-22 }}{{cite report|last1=Unger |first1=L M |last2=Trubey |first2=D K |title=Specific Gamma-Ray Dose Constants for Nuclides Important to Dosimetry and Radiological Assessment |url=https://www.orau.org/documents/ivhp/health-physics/ornl-rsic-45.pdf |publisher=Oak Ridge National Laboratory|date=May 1982 |archive-url=https://web.archive.org/web/20180322020815/https://www.orau.org/documents/ivhp/health-physics/ornl-rsic-45.pdf |archive-date=22 March 2018}} 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.

References

Isotope masses from:
{{NUBASE 2003}}
Isotopic compositions and standard atomic masses from:
{{CIAAW2003}}
{{CIAAW 2005}}
Half-life, spin, and isomer data selected from the following sources.
{{NUBASE 2003}}
{{NNDC}}
{{CRC85|chapter=11}}

External links

[http://toxnet.nlm.nih.gov/cgi-bin/sis/search/r?dbs+hsdb:@term+@na+@rel+iridium,+radioactive NLM Hazardous Substances Databank – Iridium, Radioactive] (referring to iridium-192)

Category:Iridium

Iridium