Isotopes Of Iridium
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There are two natural
isotopes Isotopes are distinct nuclear species (or ''nuclides'') of the same chemical element. They have the same atomic number (number of protons in their nuclei) and position in the periodic table (and hence belong to the same chemical element), but ...
of
iridium Iridium is a chemical element; it has the symbol Ir and atomic number 77. This very hard, brittle, silvery-white transition metal of the platinum group, is considered the second-densest naturally occurring metal (after osmium) with a density ...
(77Ir), and 37
radioisotope A radionuclide (radioactive nuclide, radioisotope or radioactive isotope) is a nuclide that has excess numbers of either neutrons or protons, giving it excess nuclear energy, and making it unstable. This excess energy can be used in one of three ...
s, the most stable radioisotope being 192Ir with a
half-life Half-life is a mathematical and scientific description of exponential or gradual decay. Half-life, half life or halflife may also refer to: Film * Half-Life (film), ''Half-Life'' (film), a 2008 independent film by Jennifer Phang * ''Half Life: ...
of 73.83 days, and many
nuclear isomer A nuclear isomer is a metastable state of an atomic nucleus, in which one or more nucleons (protons or neutrons) occupy excited state levels (higher energy levels). "Metastable" describes nuclei whose excited states have Half-life, half-lives of ...
s, 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 Stable nuclides are isotopes of a chemical element whose nucleons are in a configuration that does not permit them the surplus energy required to produce a radioactive emission. The nuclei of such isotopes are not radioactive and unlike radionuc ...
, meaning that they are predicted to be radioactive but no actual decay has been observed.


List of isotopes

, -id=Iridium-164 , 164IrDiscovery of this isotope is unconfirmed , style="text-align:right" , 77 , style="text-align:right" , 87 , 163.99197(34)# , <0.5 Î¼s , 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) Î¼s , 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)# , , 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) Î¼s , 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" , 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, , 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 , 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) Î¼s , 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) Î¼s , 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) Î¼s , 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 , 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 Î¼s , 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 Stable Stable nuclides are isotopes of a chemical element whose nucleons are in a configuration that does not permit them the surplus energy required to produce a radioactive emission. The nuclei of such isotopes are not radioactive and unlike radionuc ...
, 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 Stable , 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) Î¼s , 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) Î¼s , 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) Î¼s , IT , 197Ir , , , , -id=Iridium-197m3 , style="text-indent:1em" , 197m3Ir , colspan="3" style="text-indent:2em" , 2800(500)# keV , 15(9) Î¼s , 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) Î¼s , 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 Isotopes are distinct nuclear species (or ''nuclides'') of the same chemical element. They have the same atomic number (number of protons in their Atomic nucleus, nuclei) and position in the periodic table (and hence belong to the same chemica ...
of
iridium Iridium is a chemical element; it has the symbol Ir and atomic number 77. This very hard, brittle, silvery-white transition metal of the platinum group, is considered the second-densest naturally occurring metal (after osmium) with a density ...
, with a
half-life Half-life is a mathematical and scientific description of exponential or gradual decay. Half-life, half life or halflife may also refer to: Film * Half-Life (film), ''Half-Life'' (film), a 2008 independent film by Jennifer Phang * ''Half Life: ...
of 73.83 days. 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. Iridium-192 is normally produced by neutron activation of natural-abundance iridium metal. Iridium-192 is a very strong
gamma ray A gamma ray, also known as gamma radiation (symbol ), is a penetrating form of electromagnetic radiation arising from high energy interactions like the radioactive decay of atomic nuclei or astronomical events like solar flares. It consists o ...
emitter, with a gamma dose-constant of approximately 1.54
μSv The sievert (symbol: SvPlease note there are two non-SI units that use the same Sv abbreviation: the sverdrup and svedberg.) is a derived unit in the International System of Units (SI) intended to represent the stochastic health risk of ionizing ...
·h−1· MBq−1 at 30 cm, and a specific activity of 341 TBq·g−1 (9.22 kCi·g−1). 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 * Isotopes of platinum * Isotopes of osmium * Isotopes of rhenium


References

* Isotope masses from: ** * Isotopic compositions and standard atomic masses from: ** ** * Half-life, spin, and isomer data selected from the following sources. ** ** **


External links


NLM Hazardous Substances Databank – Iridium, Radioactive
(referring to iridium-192) {{Navbox element isotopes Iridium
Iridium Iridium is a chemical element; it has the symbol Ir and atomic number 77. This very hard, brittle, silvery-white transition metal of the platinum group, is considered the second-densest naturally occurring metal (after osmium) with a density ...