Isotopes of iridium

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Template:Short description Template:Infobox iridium isotopes 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.[1]

List of isotopes

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Template:Isotopes table |-id=Iridium-164 | 164Ir[n 1][2] | 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| | rowspan=2| |- | α (4%) | 160mRe |-id=Iridium-165 | 165Ir | style="text-align:right" | 77 | style="text-align:right" | 88 | 165.98572(22)# | Template:Val[3] | p | 164Os | (1/2+) | | |-id=Iridium-165m | rowspan=2 style="text-indent:1em" | 165mIr[2] | 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=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| | 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| | 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| | 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| | 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" | 168mIr[n 2] | 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| | 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| | 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| | 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| | rowspan=2| |- | α (5.2%) | 166Re |-id=Iridium-170m | rowspan=3 style="text-indent:1em" | 170mIr[n 2] | rowspan=3 colspan="3" style="text-indent:2em" | 40(50)# keV | rowspan=3|811(18) 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|170.971646(41) | rowspan=2|3.1(3) 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-indent:2em" | 164(11)# keV | rowspan=3|1.47(6) 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|171.970607(35) | rowspan=2|4.4(3) 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-indent:2em" | 139(10) keV | rowspan=2|2.19(7) 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|172.967505(11) | rowspan=2|9.0(8) 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-indent:2em" | 226(9) keV | rowspan=2|2.20(5) 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|173.966950(12) | rowspan=2|7.9(6) 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-indent:2em" | 124(16) keV | rowspan=2|4.9(3) 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|174.964150(13) | rowspan=2|9(2) 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-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| | 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| | 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| | 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[4] | EC | rowspan=2|190Os | rowspan=2|4− | rowspan=2 | |- | β+ (<0.002%)[4] |-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| | 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 StableTemplate:Refn | 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| | 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| | 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 StableTemplate:Refn | 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+# | | Template:Isotopes table/footer

Iridium-192

Template:Main article

Iridium-192 (symbol 192Ir) is a radioactive isotope of iridium, with a half-life of 73.83 days.[5] 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.[6] Iridium-192 is normally produced by neutron activation of natural-abundance iridium metal.[7]

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).[8][9] 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.

See also

Daughter products other than iridium

References

Template:Reflist

External links

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