There are two natural isotopes of iridium (77Ir), 191Ir and 193Ir, both stable. In addition, there are 40 known radioisotopes with mass numbers 164 through 205, the most stable being 192Ir with a half-life of 73.82 days, and many nuclear isomers, the most stable of which is 192m2Ir with a half-life of 241 years. All other nuclides have half-lives under two weeks, 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.[1]

The isotope 191Ir was the first one of any element to be shown to present a Mössbauer effect. This renders it useful for Mössbauer spectroscopy for research in physics, chemistry, biochemistry, metallurgy, and mineralogy.[2]

List of isotopes

|-id=Iridium-164 | 164Ir[n 1][3] | style="text-align:right" | 77 | style="text-align:right" | 87 | style="text-align:center" | 163.99197 | style="text-align:center" | 2014 | 0.5 μs | p? | 163Os | 2# | | |-id=Iridium-164m | rowspan=2 style="text-indent:1em" | 164mIr | rowspan=2 colspan=3 style="text-align:center" | 260 keV | rowspan=2 style="text-align:center" | 2014 | rowspan=2| 70 μs | p (96%) | 163Os | rowspan=2| (9+) | rowspan=2| | rowspan=2| |- | α (4%) | 160mRe |-id=Iridium-165 | 165Ir | style="text-align:right" | 77 | style="text-align:right" | 88 | style="text-align:center" | 165.98572 | style="text-align:center" | 1997 | 1.20 ± 0.82 μs[4] | p | 164Os | (1/2+) | | |-id=Iridium-165m | rowspan=2 style="text-indent:1em" | 165mIr[3] | rowspan=2 colspan=3 style="text-align:center" | ~255 keV | rowspan=2 style="text-align:center" | 1997 | rowspan=2| 340 μs | p (88%) | 164Os | rowspan=2|(11/2) | rowspan=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 style="text-align:center" | 165.98582 | rowspan=2 style="text-align:center" | 1981 | rowspan=2| 10.5 ms | α (93%) | 162Re | rowspan=2|(2) | rowspan=2| | rowspan=2| |- | p (7%) | 165Os |-id=Iridium-166m | rowspan=2 style="text-indent:1em" | 166mIr | rowspan=2 colspan=3 style="text-align:center" | 171 keV | rowspan=2 style="text-align:center" | 1997 | rowspan=2| 15.1 ms | α (98.2%) | 162Re | rowspan=2|(9)+ | rowspan=2| | 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 style="text-align:center" | 166.981672 | rowspan=3 style="text-align:center" | 1981 | rowspan=3| 29.3 ms | α (43.5%) | 163Re | rowspan=3|1/2+ | rowspan=3| | 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-align:center" | 175.5 keV | rowspan=3 style="text-align:center" | 1997 | rowspan=3| 28.5 ms | α (89%) | 163Re | rowspan=3|11/2 | rowspan=3| | rowspan=3| |- | β+ (11%) | 167Os |- | p (0.41%) | 166Os |-id=Iridium-168 | 168Ir | style="text-align:right" | 77 | style="text-align:right" | 91 | style="text-align:center" | 167.979961 | style="text-align:center" | 1978 | 230 ms | α | 164Re | (2)- | | |-id=Iridium-168m | rowspan=3 style="text-indent:1em" | 168mIr[n 2] | rowspan=3 colspan=3 style="text-align:center" | 40 keV | rowspan=3 style="text-align:center" | 1996 | rowspan=3| 163 ms | α (77%) | 164Re | rowspan=3|(9,10)+ | rowspan=3| | 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 style="text-align:center" | 168.976282 | rowspan=2 style="text-align:center" | 1978 | rowspan=2| 353 ms | α (53%) | 165Re | rowspan=2|(1/2+) | rowspan=2| | rowspan=2| |- | β+ (47%) | 169Os |-id=Iridium-169m | rowspan=3 style="text-indent:1em" | 169mIr | rowspan=3 colspan=3 style="text-align:center" | 153 keV | rowspan=3 style="text-align:center" | 1999 | rowspan=3| 280 ms | α (79%) | 165Re | rowspan=3|(11/2) | rowspan=3| | 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 style="text-align:center" | 169.97511 | rowspan=2 style="text-align:center" | 1977 | rowspan=2| 910 ms | β+ (94.8%) | 170Os | rowspan=2|(3) | rowspan=2| | rowspan=2| |- | α (5.2%) | 166Re |-id=Iridium-170m | rowspan=3 style="text-indent:1em" | 170mIr[n 2] | rowspan=3 colspan=3 style="text-align:center" | 40#keV | rowspan=3 style="text-align:center" | 2002 | rowspan=3| 811 ms | α (38%) | 166Re | rowspan=3|(8+) | rowspan=3| | 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 style="text-align:center" | 170.971646 | rowspan=2 style="text-align:center" | 1967 | rowspan=2| 3.1 s | β+ (85%) | 171Os | rowspan=2|1/2+ | rowspan=2| | rowspan=2| |- | α (15%) | 167Re |-id=Iridium-171m | rowspan=3 style="text-indent:1em" | 171mIr | rowspan=3 colspan=3 style="text-align:center" | 164#keV | rowspan=3 style="text-align:center" | 2002 | rowspan=3| 1.47 s | α (54%) | 167Re | rowspan=3|(11/2) | rowspan=3| | 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 style="text-align:center" | 171.970607 | rowspan=2 style="text-align:center" | 1967 | rowspan=2| 4.4 s | β+ (~98%) | 172Os | rowspan=2|(3,4) | rowspan=2| | rowspan=2| |- | α (~2%) | 168Re |-id=Iridium-172m | rowspan=2 style="text-indent:1em" | 172mIr | rowspan=2 colspan=3 style="text-align:center" | 139 keV | rowspan=2 style="text-align:center" | 1992 | rowspan=2| 2.19 s | β+ (90.5%) | 172Os | rowspan=2|(7+) | rowspan=2| | 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 style="text-align:center" | 172.967505 | rowspan=2 style="text-align:center" | 1967 | rowspan=2| 9.0 s | β+ (96.5%) | 173Os | rowspan=2|(1/2+,3/2+) | rowspan=2| | rowspan=2| |- | α (3.5%) | 169Re |-id=Iridium-173m | rowspan=2 style="text-indent:1em" | 173mIr | rowspan=2 colspan=3 style="text-align:center" | 226 keV | rowspan=2 style="text-align:center" | 1992 | rowspan=2| 2.20 s | β+ (88%) | 173Os | rowspan=2|11/2 | rowspan=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 style="text-align:center" | 173.966950 | rowspan=2 style="text-align:center" | 1967 | rowspan=2| 7.9 s | β+ (99.5%) | 174Os | rowspan=2|(2+,3) | rowspan=2| | rowspan=2| |- | α (0.5%) | 170Re |-id=Iridium-174m | rowspan=2 style="text-indent:1em" | 174mIr | rowspan=2 colspan=3 style="text-align:center" | 124 keV | rowspan=2 style="text-align:center" | 1992 | rowspan=2| 4.9 s | β+ (97.5%) | 174Os | rowspan=2|(6,7,8,9) | rowspan=2| | 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 style="text-align:center" | 174.964150 | rowspan=2 style="text-align:center" | 1967 | rowspan=2| 9 s | β+ (99.15%) | 175Os | rowspan=2|(1/2+) | rowspan=2| | rowspan=2| |- | α (0.85%) | 171Re |-id=Iridium-175m1 | style="text-indent:1em" | 175m1Ir | colspan=3 style="text-align:center" | 50 keV | style="text-align:center" | 2010 | 33 s | β+ | 175Os | 9/2# | | |-id=Iridium-175m2 | style="text-indent:1em" | 175m2Ir | colspan=3 style="text-align:center" | 97.4 keV | style="text-align:center" | 2019 |6.58 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 style="text-align:center" | 175.9636263 | rowspan=2 style="text-align:center" | 1967 | rowspan=2| 8.7 s | β+ (96.9%) | 176Os | rowspan=2|(3+) | rowspan=2| | 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 style="text-align:center" | 176.961302 | rowspan=2 style="text-align:center" | 1967 | rowspan=2| 29.8 s | β+ (99.94%) | 177Os | rowspan=2|5/2 | rowspan=2| | rowspan=2| |- | α (0.06%) | 173Re |-id=Iridium-177m | style="text-indent:1em" | 177mIr | colspan=3 style="text-align:center" | 180.9 keV | style="text-align:center" | (1991)[n 3] | 100 ns | IT | 177Ir | (5/2+) | | |-id=Iridium-178 | 178Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 101 | style="text-align:center" | 177.961079 | style="text-align:center" | 1972 | 12 s | β+ | 178Os | 3+# | | |-id=Iridium-179 | 179Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 102 | style="text-align:center" | 178.959118 | style="text-align:center" | 1992 | 79 s | β+ | 179Os | (5/2) | | |-id=Iridium-180 | 180Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 103 | style="text-align:center" | 179.959229 | style="text-align:center" | 1972 | 1.5 min | β+ | 180Os | (5+) | | |-id=Iridium-181 | 181Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 104 | style="text-align:center" | 180.9576347 | style="text-align:center" | 1972 | 4.90 min | β+ | 181Os | 5/2 | | |-id=Iridium-181m1 | style="text-indent:1em" | 181m1Ir | colspan=3 style="text-align:center" | 289.33 keV | style="text-align:center" | 1992 | 298 ns | IT | 181Ir | 5/2+ | | |-id=Iridium-181m2 | style="text-indent:1em" | 181m2Ir | colspan=3 style="text-align:center" | 366.30 keV | style="text-align:center" | 1990 | 126 ns | IT | 181Ir | 9/2 | | |-id=Iridium-182 | 182Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 105 | style="text-align:center" | 181.958076 | style="text-align:center" | 1961 | 15.0 min | β+ | 182Os | 3+ | | |-id=Iridium-182m1 | style="text-indent:1em" | 182m1Ir | colspan=3 style="text-align:center" | 71.02 keV | style="text-align:center" | 1990 | 170 ns | IT | 182Ir | (5)+ | | |-id=Iridium-182m2 | style="text-indent:1em" | 182m2Ir | colspan=3 style="text-align:center" | 176.4 keV | style="text-align:center" | 1990 | 130 ns | IT | 182Ir | (6) | | |-id=Iridium-183 | 183Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 106 | style="text-align:center" | 182.956841 | style="text-align:center" | 1961 | 58 min | β+ | 183Os | 5/2 | | |-id=Iridium-184 | 184Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 107 | style="text-align:center" | 183.957476 | style="text-align:center" | 1960 | 3.09 h | β+ | 184Os | 5 | | |-id=Iridium-184m1 | style="text-indent:1em" | 184m1Ir | colspan=3 style="text-align:center" | 225.65 keV | style="text-align:center" | 1988 | 470 μs | IT | 184Ir | 3+ | | |-id=Iridium-184m2 | style="text-indent:1em" | 184m2Ir | colspan=3 style="text-align:center" | 328.40 keV | style="text-align:center" | 1988 | 350 ns | IT | 184Ir | 7+ | | |-id=Iridium-185 | 185Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 108 | style="text-align:center" | 184.956698 | style="text-align:center" | 1958 | 14.4 h | β+ | 185Os | 5/2 | | |-id=Iridium-185m | style="text-indent:1em" | 185mIr | colspan=3 style="text-align:center" | 2,197 keV | style="text-align:center" | 1979 | 120 ns | IT | 185Ir | (23/2,25/2)# | | |-id=Iridium-186 | 186Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 109 | style="text-align:center" | 185.957947 | style="text-align:center" | 1958 | 16.64 h | β+ | 186Os | 5+ | | |-id=Iridium-186m | rowspan=2 style="text-indent:1em" | 186mIr | rowspan=2 colspan=3 style="text-align:center" | 0.8 keV | rowspan=2 style="text-align:center" | 1962 | rowspan=2| 1.92 h | β+ (~75%) | 186Os | rowspan=2|2 | rowspan=2| | rowspan=2| |- | IT (~25%) | 186Ir |-id=Iridium-187 | 187Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 110 | style="text-align:center" | 186.957542 | style="text-align:center" | 1958 | 10.5 h | β+ | 187Os | 3/2+ | | |-id=Iridium-187m1 | style="text-indent:1em" | 187m1Ir | colspan=3 style="text-align:center" | 186.16 keV | style="text-align:center" | 1963 | 30.3 ms | IT | 187Ir | 9/2 | | |-id=Iridium-187m2 | style="text-indent:1em" | 187m2Ir | colspan=3 style="text-align:center" | 433.75 keV | style="text-align:center" | 1969 | 152 ns | IT | 187Ir | 11/2 | | |-id=Iridium-187m3 | style="text-indent:1em" | 187m3Ir | colspan=3 style="text-align:center" | 2,487.7 keV | style="text-align:center" | 2010 | 1.8 μs | IT | 187Ir | 29/2 | | |-id=Iridium-188 | 188Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 111 | style="text-align:center" | 187.958835 | style="text-align:center" | 1950 | 41.5 h | β+ | 188Os | 1 | | |-id=Iridium-188m | style="text-indent:1em" | 188mIr | colspan=3 style="text-align:center" | 964 keV | style="text-align:center" | 1971 | 4.15 ms | IT | 188Ir | 11# | | |-id=Iridium-189 | 189Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 112 | style="text-align:center" | 188.958723 | style="text-align:center" | 1955 | 13.2 d | EC | 189Os | 3/2+ | | |-id=Iridium-189m1 | style="text-indent:1em" | 189m1Ir | colspan=3 style="text-align:center" | 372.17 keV | style="text-align:center" | 1963 | 13.3 ms | IT | 189Ir | 11/2 | | |-id=Iridium-189m2 | style="text-indent:1em" | 189m2Ir | colspan=3 style="text-align:center" | 2,332.8 keV | style="text-align:center" | 1975 | 3.7 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 style="text-align:center" | 189.9605434 | rowspan=2 style="text-align:center" | 1947 | rowspan=2|11.7511 d[5] | EC | rowspan=2|190Os | rowspan=2|4 | rowspan=2 | |- | β+ (<0.002%)[5] |-id=Iridium-190m1 | style="text-indent:1em" | 190m1Ir | colspan=3 style="text-align:center" | 26.1 keV | style="text-align:center" | 1964 | 1.120 h | IT | 190Ir | 1 | | |-id=Iridium-190m2 | style="text-indent:1em" | 190m2Ir | colspan=3 style="text-align:center" | 36.154 keV | style="text-align:center" | 1996 | 2 μs | IT | 190Ir | 4+ | | |-id=Iridium-190m3 | rowspan=2 style="text-indent:1em" | 190m3Ir | colspan=3 rowspan=2 style="text-align:center" | 376.4 keV | rowspan=2 style="text-align:center" | 1950 | rowspan=2| 3.087 h | EC (91.4%) | 190Os | rowspan=2|11 | rowspan=2| | rowspan=2| |- | IT (8.6%) | 190Ir |-id=Iridium-191 | 191Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 114 | style="text-align:center" | 190.9605915 | style="text-align:center" | 1935 | colspan=3 style="text-align:center" data-sort-value=99999999999999999999999|Observationally Stable["n" 1] | 3/2+ | style="text-align:center" | 0.373 | |-id=Iridium-191m1 | style="text-indent:1em" | 191m1Ir | colspan=3 style="text-align:center" | 171.29 keV | style="text-align:center" | 1954 | 4.899 s | IT | 191Ir | 11/2 | | |-id=Iridium-191m2 | style="text-indent:1em" | 191m2Ir | colspan=3 style="text-align:center" | 2,101.0 keV | style="text-align:center" | 2012 | 5.7 s | IT | 191Ir | 31/2(+) | | |-id=Iridium-192 | rowspan=2|192Ir | rowspan=2 style="text-align:right" | 77 | rowspan=2 style="text-align:right" | 115 | rowspan=2 style="text-align:center" | 191.9626024 | rowspan=2 style="text-align:center" | 1937 | rowspan=2| 73.820 d | β− (95.24%) | 192Pt | rowspan=2|4+ | rowspan=2| | rowspan=2| |- | EC (4.76%) | 192Os |-id=Iridium-192m1 | rowspan=2 style="text-indent:1em" | 192m1Ir | colspan=3 rowspan=2 style="text-align:center" | 56.720 keV | rowspan=2 style="text-align:center" | 1947 | rowspan=2| 1.45 min | IT (99.98%) | 192Ir | rowspan=2|1 | rowspan=2| | rowspan=2| |- | β− (0.0175%) | 192Pt |-id=Iridium-192m2 | style="text-indent:1em" | 192m2Ir | colspan=3 style="text-align:center" | 168.14 keV | style="text-align:center" | 1959 | 241 y | IT | 192Ir | (11) | | |-id=Iridium-193 | 193Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 116 | style="text-align:center" | 192.9629238 | style="text-align:center" | 1935 | colspan=3 style="text-align:center" data-sort-value=99999999999999999999999|Observationally Stable["n" 2] | 3/2+ | style="text-align:center" | 0.627 | |-id=Iridium-193m1 | style="text-indent:1em" | 193m1Ir | colspan=3 style="text-align:center" | 80.238 keV | style="text-align:center" | 1957 | 10.53 d | IT | 193Ir | 11/2 | | |-id=Iridium-193m2 | style="text-indent:1em" | 193m2Ir | colspan=3 style="text-align:center" | 2,278.9 keV | style="text-align:center" | 2012 | 124.8 μs | IT | 193Ir | 31/2+ | | |-id=Iridium-194 | 194Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 117 | style="text-align:center" | 193.9650757 | style="text-align:center" | 1937 | 19.35 h | β− | 194Pt | 1 | | |-id=Iridium-194m1 | style="text-indent:1em" | 194m1Ir | colspan=3 style="text-align:center" | 147.072 keV | style="text-align:center" | 1959 | 31.85 ms | IT | 194Ir | 4+ | | |-id=Iridium-194m2 | style="text-indent:1em" | 194m2Ir | colspan=3 style="text-align:center" | 370 keV | style="text-align:center" | 1968 | 171 d | β− | 194Pt | (11) | | |-id=Iridium-195 | 195Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 118 | style="text-align:center" | 194.9659769 | style="text-align:center" | 1952 | 2.29 h | β− | 195Pt | 3/2+ | | |-id=Iridium-195m1 | style="text-indent:1em" | 195m1Ir | colspan=3 style="text-align:center" | 100 keV | style="text-align:center" | 1968 | 3.74 h | β− | 195Pt | 11/2 | | |-id=Iridium-195m2 | style="text-indent:1em" | 195m2Ir | colspan=3 style="text-align:center" | 2,354 keV | style="text-align:center" | 2011 | 4.4 μs | IT | 195Ir | (27/2+) | | |-id=Iridium-196 | 196Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 119 | style="text-align:center" | 195.968400 | style="text-align:center" | 1966 | 52.0 s | β− | 196Pt | (1,2) | | |-id=Iridium-196m | style="text-indent:1em" | 196mIr | colspan=3 style="text-align:center" | 210 keV | style="text-align:center" | 1967 | 1.40 h | β− | 196Pt | 11# | | |-id=Iridium-197 | 197Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 120 | style="text-align:center" | 196.969657 | style="text-align:center" | 1952 | 5.8 min | β− | 197Pt | 3/2+ | | |-id=Iridium-197m1 | style="text-indent:1em" | 197m1Ir | colspan=3 style="text-align:center" | 115 keV | style="text-align:center" | (1978)[n 4] | 8.9 min | β− | 197Pt | 11/2 | | |-id=Iridium-197m2 | style="text-indent:1em" | 197m2Ir | colspan=3 style="text-align:center" | 1,700#keV | style="text-align:center" | 2005

| 30 μs | IT | 197Ir | | | |-id=Iridium-197m3 | style="text-indent:1em" | 197m3Ir | colspan=3 style="text-align:center" | 2,800#keV | style="text-align:center" | 2005

| 15 μs | IT | 197Ir | | | |-id=Iridium-198 | 198Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 121 | style="text-align:center" | 197.97240 | style="text-align:center" | 1973 | 8.7 s | β− | 198Pt | 1 | | |-id=Iridium-199 | 199Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 122 | style="text-align:center" | 198.973807 | style="text-align:center" | 1993 | 7 s | β− | 199Pt | 3/2+# | | |-id=Iridium-200 | 200Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 123 | style="text-align:center" | 199.97684 | style="text-align:center" | 2008 | 43 s | β− | 200Pt | (2, 3) | | |-id=Iridium-201 | 201Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 124 | style="text-align:center" | 200.97870 | style="text-align:center" | 2008 | 21 s | β− | 201Pt | (3/2+) | | |-id=Iridium-202 | 202Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 125 | style="text-align:center" | 201.98214 | style="text-align:center" | 2008 | 11 s | β− | 202Pt | (2) | | |-id=Iridium-202m | style="text-indent:1em" | 202mIr | colspan=3 style="text-align:center" | 2,600#keV | style="text-align:center" | 2011 | 3.4 μs | IT | 202Ir | | | |-id=Iridium-203 | 203Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 126 | style="text-align:center" | 202.98457 | style="text-align:center" | 2011 | 7 s [>300 ns] | | | 3/2+# | | |-id=Iridium-203m | style="text-indent:1em" | 203mIr | colspan=3 style="text-align:center" | 2,140#keV | style="text-align:center" | 2011 | 798 ns | IT | 203Ir | | | |-id=Iridium-204 | 204Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 127 | style="text-align:center" | 203.98973 | style="text-align:center" | 2011 | 2 s [>300 ns] | | | 3/2+# | | |-id=Iridium-205 | 205Ir |rowspan="1" style="text-align:right" | 77 |rowspan="1" style="text-align:right" | 128 | style="text-align:center" | 204.99399 | style="text-align:center" | 2012 | 1 s [>300 ns] | | | 3/2+# | |

Iridium-192

Main article: Iridium-192

Iridium-192 (symbol 192Ir) is a radioactive isotope of iridium, with a half-life of 73.82 days.[6] It decays by emitting beta (β) particles and gamma (γ) radiation. 95.24% of 192Ir decays occur via β- emission, leading to 192Pt; the remaining 4.76% occur via electron capture to 192Os; both modes involve gamma emission. Iridium-192 is normally produced by neutron activation of natural-abundance iridium metal.[7]

Iridium-192 is used in brachytherapy and in industrial radiography, particularly for nondestructive testing of welds in steel in the oil and gas industries.

See also

Daughter products other than iridium

References

  1. ^ Belli, P.; Bernabei, R.; Danevich, F. A. et al. (2019). "Experimental searches for rare alpha and beta decays". European Physical Journal A. 55 (8): 140–1–140–7. arXiv:1908.11458. Bibcode:2019EPJA...55..140B. doi:10.1140/epja/i2019-12823-2. ISSN 1434-601X. S2CID 201664098
  2. ^ Chereminisoff, N. P. (1990). Handbook of Ceramics and Composites. CRC Press. p. 424. ISBN 978-0-8247-8006-7.
  3. ^ Drummond, M. C.; O\'Donnell, D.; Page, R. D.; Joss, D. T.; Capponi, L.; Cox, D. M.; Darby, I. G.; Donosa, L.; Filmer, F.; Grahn, T.; Greenlees, P. T.; Hauschild, K.; Herzan, A.; Jakobsson, U.; Jones, P. M.; Julin, R.; Juutinen, S.; Ketelhut, S.; Leino, M.; Lopez-Martens, A.; Mistry, A. K.; Nieminen, P.; Peura, P.; Rahkila, P.; Rinta-Antila, S.; Ruotsalainen, P.; Sandzelius, M.; Sarén, J.; Sayğı, B.; Scholey, C.; Simpson, J.; Sorri, J.; Thornthwaite, A.; Uusitalo, J. (16 June 2014). "α decay of the π h 11 / 2 isomer in Ir 164". Physical Review C. 89 (6). Bibcode:2014PhRvC..89f4309D. doi:10.1103/PhysRevC.89.064309. ISSN 0556-2813. Retrieved 21 June 2023.
  4. ^ Hilton, Joshua Ben. "Decays of new nuclides 169Au, 170Hg, 165Pt and the ground state of 165Ir discovered using MARA". University of Liverpool. Retrieved 21 June 2023.
  5. ^ Janiak, Ł.; Gierlik, M.; Kosinski, T.; Matusiak, M.; Madejowski, G.; Wronka, S.; Rzadkiewicz, J. (2024). "Half-life of 190Ir". Physical Review C. 110 (14306). Bibcode:2024PhRvC.110a4306J. doi:10.1103/PhysRevC.110.014306
  6. ^ "Radioisotope Brief: Iridium-192 (Ir-192)". Retrieved 20 March 2012.
  7. ^ "Isotope Supplier: Stable Isotopes and Radioisotopes from ISOFLEX - Iridium-192". www.isoflex.com. Retrieved 2017-10-11.
  1. ^ Discovery of this isotope is unconfirmed
  2. ^ Order of ground state and isomer is uncertain.
  3. ^ Half-life not measured, not included in discovery database
  4. ^ Only published in a conference proceeding and not a refereed journal
  1. ^ Believed to undergo α decay to 187Re[8][9]
  2. ^ Believed to undergo α decay to 189Re[8]