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Isotopes of iridium
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<h2 id="list-of-isotopes">List of isotopes</h2> <table><tbody><tr><th rowspan="2">Nuclide<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a><a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a></th><th rowspan="1"><a href="/facts/Atomic_number/bgAr581S"><i>Z</i></a></th><th rowspan="1"><a href="/facts/Neutron_number/eNtwGnVL"><i>N</i></a></th><th rowspan="1"><a href="/facts/Atomic_mass/J1FJY9MV">Isotopic mass</a> (<a href="/facts/Dalton_(unit)/IMATU3vf">Da</a>)<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a><a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a><a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a></th><th rowspan="2"><a href="/facts/Half-life/kGVH8BAB">Half-life</a><a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a></th><th rowspan="2"><a href="/facts/Decay_mode/Ya6FVjt4">Decaymode</a><a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a></th><th rowspan="2"><a href="/facts/Decay_product/hT0obfLv">Daughterisotope</a><a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a><a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a></th><th rowspan="2"><a href="/facts/Spin_(particle_physics)/4Jvp7e8P">Spin</a> and<a href="/facts/Parity_(physics)/emSbJ4hD">parity</a><a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a><a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a></th><th colspan="2"><a href="/facts/Natural_abundance/dGjaAwc9">Natural abundance</a> (mole fraction)</th></tr><tr><th colspan="3">Excitation energy<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a></th><th>Normal proportion</th><th>Range of variation</th></tr><tr><td>164Ir<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a></td><td>77</td><td>87</td><td>163.99220(44)#</td><td><0.5 μs</td><td><a href="/facts/Proton_emission/9zxVkBkp">p</a>?</td><td>163Os</td><td>2−#</td><td></td><td></td></tr><tr><td rowspan="2">164mIr</td><td rowspan="2" colspan="3">270(110)# keV</td><td rowspan="2">70(10) μs</td><td>p (96%)</td><td>163Os</td><td rowspan="2">9+#</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td><a href="/facts/Alpha_decay/rCsHNIUE">α</a> (4%)</td><td>160mRe</td></tr><tr><td>165Ir</td><td>77</td><td>88</td><td>164.98752(23)#</td><td>1.20+0.82−0.74 μs<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a></td><td>p</td><td>164Os</td><td>(1/2+)</td><td></td><td></td></tr><tr><td rowspan="2">165mIr<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a></td><td rowspan="2" colspan="3">~255 keV</td><td rowspan="2">340(40) μs</td><td>p (88%)</td><td>164Os</td><td rowspan="2">(11/2−)</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>α (12%)</td><td>161mRe</td></tr><tr><td rowspan="2">166Ir</td><td rowspan="2">77</td><td rowspan="2">89</td><td rowspan="2">165.98582(22)#</td><td rowspan="2">10.5(22) ms</td><td>α (93%)</td><td>162Re</td><td rowspan="2">(2−)</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>p (7%)</td><td>165Os</td></tr><tr><td rowspan="2">166mIr</td><td rowspan="2" colspan="3">172(6) keV</td><td rowspan="2">15.1(9) ms</td><td>α (98.2%)</td><td>162Re</td><td rowspan="2">(9+)</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>p (1.8%)</td><td>165Os</td></tr><tr><td rowspan="3">167Ir</td><td rowspan="3">77</td><td rowspan="3">90</td><td rowspan="3">166.981665(20)</td><td rowspan="3">35.2(20) ms</td><td>α (48%)</td><td>163Re</td><td rowspan="3">1/2+</td><td rowspan="3"></td><td rowspan="3"></td></tr><tr><td>p (32%)</td><td>166Os</td></tr><tr><td><a href="/facts/Beta_decay/vxTBlckp">β+</a> (20%)</td><td>167Os</td></tr><tr><td rowspan="3">167mIr</td><td rowspan="3" colspan="3">175.3(22) keV</td><td rowspan="3">30.0(6) ms</td><td>α (80%)</td><td>163Re</td><td rowspan="3">11/2−</td><td rowspan="3"></td><td rowspan="3"></td></tr><tr><td>β+ (20%)</td><td>167Os</td></tr><tr><td>p (.4%)</td><td>166Os</td></tr><tr><td rowspan="2">168Ir</td><td rowspan="2">77</td><td rowspan="2">91</td><td rowspan="2">167.97988(16)#</td><td rowspan="2">161(21) ms</td><td>α</td><td>164Re</td><td rowspan="2">(2-)</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>β+ (rare)</td><td>168Os</td></tr><tr><td>168mIr</td><td colspan="3">50(100)# keV</td><td>125(40) ms</td><td>α</td><td>164Re</td><td>(9+)</td><td></td><td></td></tr><tr><td rowspan="2">169Ir</td><td rowspan="2">77</td><td rowspan="2">92</td><td rowspan="2">168.976295(28)</td><td rowspan="2">780(360) ms[640+460−240 ms]</td><td>α</td><td>165Re</td><td rowspan="2">(1/2+)</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>β+ (rare)</td><td>169Os</td></tr><tr><td rowspan="2">169mIr</td><td rowspan="2" colspan="3">154(24) keV</td><td rowspan="2">308(22) ms</td><td>α (72%)</td><td>165Re</td><td rowspan="2">(11/2−)</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>β+ (28%)</td><td>169Os</td></tr><tr><td rowspan="2">170Ir</td><td rowspan="2">77</td><td rowspan="2">93</td><td rowspan="2">169.97497(11)#</td><td rowspan="2">910(150) ms[870+180−120 ms]</td><td>β+ (64%)</td><td>170Os</td><td rowspan="2">low#</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>α (36%)</td><td>166Re</td></tr><tr><td rowspan="3">170mIr</td><td rowspan="3" colspan="3">160(50)# keV</td><td rowspan="3">440(60) ms</td><td>α (36%)</td><td>166Re</td><td rowspan="3">(8+)</td><td rowspan="3"></td><td rowspan="3"></td></tr><tr><td>β+</td><td>170Os</td></tr><tr><td>IT</td><td>170Ir</td></tr><tr><td rowspan="2">171Ir</td><td rowspan="2">77</td><td rowspan="2">94</td><td rowspan="2">170.97163(4)</td><td rowspan="2">3.6(10) s[3.2+13−7 s]</td><td>α (58%)</td><td>167Re</td><td rowspan="2">1/2+</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>β+ (42%)</td><td>171Os</td></tr><tr><td>171mIr</td><td colspan="3">180(30)# keV</td><td>1.40(10) s</td><td></td><td></td><td>(11/2−)</td><td></td><td></td></tr><tr><td rowspan="2">172Ir</td><td rowspan="2">77</td><td rowspan="2">95</td><td rowspan="2">171.970610(30)</td><td rowspan="2">4.4(3) s</td><td>β+ (98%)</td><td>172Os</td><td rowspan="2">(3+)</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>α (2%)</td><td>168Re</td></tr><tr><td rowspan="2">172mIr</td><td rowspan="2" colspan="3">280(100)# keV</td><td rowspan="2">2.0(1) s</td><td>β+ (77%)</td><td>172Os</td><td rowspan="2">(7+)</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>α (23%)</td><td>168Re</td></tr><tr><td rowspan="2">173Ir</td><td rowspan="2">77</td><td rowspan="2">96</td><td rowspan="2">172.967502(15)</td><td rowspan="2">9.0(8) s</td><td>β+ (93%)</td><td>173Os</td><td rowspan="2">(3/2+,5/2+)</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>α (7%)</td><td>169Re</td></tr><tr><td rowspan="2">173mIr</td><td rowspan="2" colspan="3">253(27) keV</td><td rowspan="2">2.20(5) s</td><td>β+ (88%)</td><td>173Os</td><td rowspan="2">(11/2−)</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>α (12%)</td><td>169Re</td></tr><tr><td rowspan="2">174Ir</td><td rowspan="2">77</td><td rowspan="2">97</td><td rowspan="2">173.966861(30)</td><td rowspan="2">7.9(6) s</td><td>β+ (99.5%)</td><td>174Os</td><td rowspan="2">(3+)</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>α (.5%)</td><td>170Re</td></tr><tr><td rowspan="2">174mIr</td><td rowspan="2" colspan="3">193(11) keV</td><td rowspan="2">4.9(3) s</td><td>β+ (99.53%)</td><td>174Os</td><td rowspan="2">(7+)</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>α (.47%)</td><td>170Re</td></tr><tr><td rowspan="2">175Ir</td><td rowspan="2">77</td><td rowspan="2">98</td><td rowspan="2">174.964113(21)</td><td rowspan="2">9(2) s</td><td>β+ (99.15%)</td><td>175Os</td><td rowspan="2">(5/2−)</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>α (.85%)</td><td>171Re</td></tr><tr><td rowspan="2">176Ir</td><td rowspan="2">77</td><td rowspan="2">99</td><td rowspan="2">175.963649(22)</td><td rowspan="2">8.3(6) s</td><td>β+ (97.9%)</td><td>176Os</td><td rowspan="2"></td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>α (2.1%)</td><td>172Re</td></tr><tr><td rowspan="2">177Ir</td><td rowspan="2">77</td><td rowspan="2">100</td><td rowspan="2">176.961302(21)</td><td rowspan="2">30(2) s</td><td>β+ (99.94%)</td><td>177Os</td><td rowspan="2">5/2−</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>α (.06%)</td><td>173Re</td></tr><tr><td>178Ir</td><td>77</td><td>101</td><td>177.961082(21)</td><td>12(2) s</td><td>β+</td><td>178Os</td><td></td><td></td><td></td></tr><tr><td>179Ir</td><td>77</td><td>102</td><td>178.959122(12)</td><td>79(1) s</td><td>β+</td><td>179Os</td><td>(5/2)−</td><td></td><td></td></tr><tr><td>180Ir</td><td>77</td><td>103</td><td>179.959229(23)</td><td>1.5(1) min</td><td>β+</td><td>180Os</td><td>(4,5)(+#)</td><td></td><td></td></tr><tr><td>181Ir</td><td>77</td><td>104</td><td>180.957625(28)</td><td>4.90(15) min</td><td>β+</td><td>181Os</td><td>(5/2)−</td><td></td><td></td></tr><tr><td>182Ir</td><td>77</td><td>105</td><td>181.958076(23)</td><td>15(1) min</td><td>β+</td><td>182Os</td><td>(3+)</td><td></td><td></td></tr><tr><td rowspan="2">183Ir</td><td rowspan="2">77</td><td rowspan="2">106</td><td rowspan="2">182.956846(27)</td><td rowspan="2">57(4) min</td><td>β+ ( 99.95%)</td><td>183Os</td><td rowspan="2">5/2−</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>α (.05%)</td><td>179Re</td></tr><tr><td>184Ir</td><td>77</td><td>107</td><td>183.95748(3)</td><td>3.09(3) h</td><td>β+</td><td><i>184Os</i></td><td>5−</td><td></td><td></td></tr><tr><td>184m1Ir</td><td colspan="3">225.65(11) keV</td><td>470(30) μs</td><td></td><td></td><td>3+</td><td></td><td></td></tr><tr><td>184m2Ir</td><td colspan="3">328.40(24) keV</td><td>350(90) ns</td><td></td><td></td><td>(7)+</td><td></td><td></td></tr><tr><td>185Ir</td><td>77</td><td>108</td><td>184.95670(3)</td><td>14.4(1) h</td><td>β+</td><td>185Os</td><td>5/2−</td><td></td><td></td></tr><tr><td>186Ir</td><td>77</td><td>109</td><td>185.957946(18)</td><td>16.64(3) h</td><td>β+</td><td><i>186Os</i></td><td>5+</td><td></td><td></td></tr><tr><td rowspan="2">186mIr</td><td rowspan="2" colspan="3">0.8(4) keV</td><td rowspan="2">1.92(5) h</td><td>β+</td><td><i>186Os</i></td><td rowspan="2">2−</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td><a href="/facts/Isomeric_transition/L8DHcqnk">IT</a> (rare)</td><td>186Ir</td></tr><tr><td>187Ir</td><td>77</td><td>110</td><td>186.957363(7)</td><td>10.5(3) h</td><td>β+</td><td>187Os</td><td>3/2+</td><td></td><td></td></tr><tr><td>187m1Ir</td><td colspan="3">186.15(4) keV</td><td>30.3(6) ms</td><td>IT</td><td>187Ir</td><td>9/2−</td><td></td><td></td></tr><tr><td>187m2Ir</td><td colspan="3">433.81(9) keV</td><td>152(12) ns</td><td></td><td></td><td>11/2−</td><td></td><td></td></tr><tr><td>188Ir</td><td>77</td><td>111</td><td>187.958853(8)</td><td>41.5(5) h</td><td>β+</td><td>188Os</td><td>1−</td><td></td><td></td></tr><tr><td rowspan="2">188mIr</td><td rowspan="2" colspan="3">970(30) keV</td><td rowspan="2">4.2(2) ms</td><td>IT</td><td>188Ir</td><td rowspan="2">7+#</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>β+ (rare)</td><td>188Os</td></tr><tr><td>189Ir</td><td>77</td><td>112</td><td>188.958719(14)</td><td>13.2(1) d</td><td><a href="/facts/Electron_capture/EIccoV1u">EC</a></td><td>189Os</td><td>3/2+</td><td></td><td></td></tr><tr><td>189m1Ir</td><td colspan="3">372.18(4) keV</td><td>13.3(3) ms</td><td>IT</td><td>189Ir</td><td>11/2−</td><td></td><td></td></tr><tr><td>189m2Ir</td><td colspan="3">2333.3(4) keV</td><td>3.7(2) ms</td><td></td><td></td><td>(25/2)+</td><td></td><td></td></tr><tr><td rowspan="2">190Ir</td><td rowspan="2">77</td><td rowspan="2">113</td><td rowspan="2">189.9605460(18)</td><td rowspan="2">11.7511(20) d<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a></td><td>EC</td><td rowspan="2">190Os</td><td rowspan="2">4−</td><td rowspan="2"></td></tr><tr><td>β+ (<0.002%)<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a></td></tr><tr><td>190m1Ir</td><td colspan="3">26.1(1) keV</td><td>1.120(3) h</td><td>IT</td><td>190Ir</td><td>(1)−</td><td></td><td></td></tr><tr><td>190m2Ir</td><td colspan="3">36.154(25) keV</td><td>>2 μs</td><td></td><td></td><td>(4)+</td><td></td><td></td></tr><tr><td rowspan="2">190m3Ir</td><td rowspan="2" colspan="3">376.4(1) keV</td><td rowspan="2">3.087(12) h</td><td>EC (91.4%)<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a></td><td>190Os</td><td rowspan="2">(11)−</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>IT (8.6%)<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a></td><td>190Ir</td></tr><tr><td>191Ir</td><td>77</td><td>114</td><td>190.9605940(18)</td><td colspan="3"><a href="/facts/Observationally_Stable/vC0VVvqN">Observationally Stable</a><a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a></td><td>3/2+</td><td>0.373(2)</td><td></td></tr><tr><td>191m1Ir</td><td colspan="3">171.24(5) keV</td><td>4.94(3) s</td><td>IT</td><td>191Ir</td><td>11/2−</td><td></td><td></td></tr><tr><td>191m2Ir</td><td colspan="3">2120(40) keV</td><td>5.5(7) s</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td rowspan="2"><a href="/facts/Iridium-192/F1zVVPRq">192Ir</a></td><td rowspan="2">77</td><td rowspan="2">115</td><td rowspan="2">191.9626050(18)</td><td rowspan="2">73.827(13) d</td><td>β− (95.24%)</td><td>192Pt</td><td rowspan="2">4+</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>EC (4.76%)</td><td>192Os</td></tr><tr><td rowspan="2">192m1Ir</td><td rowspan="2" colspan="3">56.720(5) keV</td><td rowspan="2">1.45(5) min</td><td>IT (98.25%)</td><td>192Ir</td><td rowspan="2">1−</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>β− (1.75%)</td><td>192Pt</td></tr><tr><td>192m2Ir</td><td colspan="3">168.14(12) keV</td><td>241(9) y</td><td>IT</td><td>192Ir</td><td>(11−)</td><td></td><td></td></tr><tr><td>193Ir</td><td>77</td><td>116</td><td>192.9629264(18)</td><td colspan="3">Observationally Stable<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a></td><td>3/2+</td><td>0.627(2)</td><td></td></tr><tr><td>193mIr</td><td colspan="3">80.240(6) keV</td><td>10.53(4) d</td><td>IT</td><td>193Ir</td><td>11/2−</td><td></td><td></td></tr><tr><td>194Ir</td><td>77</td><td>117</td><td>193.9650784(18)</td><td>19.28(13) h</td><td>β−</td><td>194Pt</td><td>1−</td><td></td><td></td></tr><tr><td>194m1Ir</td><td colspan="3">147.078(5) keV</td><td>31.85(24) ms</td><td>IT</td><td>194Ir</td><td>(4+)</td><td></td><td></td></tr><tr><td>194m2Ir</td><td colspan="3">370(70) keV</td><td>171(11) d</td><td></td><td></td><td>(10,11)(−#)</td><td></td><td></td></tr><tr><td>195Ir</td><td>77</td><td>118</td><td>194.9659796(18)</td><td>2.5(2) h</td><td>β−</td><td>195Pt</td><td>3/2+</td><td></td><td></td></tr><tr><td rowspan="2">195mIr</td><td rowspan="2" colspan="3">100(5) keV</td><td rowspan="2">3.8(2) h</td><td>β− (95%)</td><td>195Pt</td><td rowspan="2">11/2−</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>IT (5%)</td><td>195Ir</td></tr><tr><td>196Ir</td><td>77</td><td>119</td><td>195.96840(4)</td><td>52(1) s</td><td>β−</td><td>196Pt</td><td>(0−)</td><td></td><td></td></tr><tr><td rowspan="2">196mIr</td><td rowspan="2" colspan="3">210(40) keV</td><td rowspan="2">1.40(2) h</td><td>β− (99.7%)</td><td>196Pt</td><td rowspan="2">(10,11−)</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>IT</td><td>196Ir</td></tr><tr><td>197Ir</td><td>77</td><td>120</td><td>196.969653(22)</td><td>5.8(5) min</td><td>β−</td><td>197Pt</td><td>3/2+</td><td></td><td></td></tr><tr><td rowspan="2">197mIr</td><td rowspan="2" colspan="3">115(5) keV</td><td rowspan="2">8.9(3) min</td><td>β− (99.75%)</td><td>197Pt</td><td rowspan="2">11/2−</td><td rowspan="2"></td><td rowspan="2"></td></tr><tr><td>IT (.25%)</td><td>197Ir</td></tr><tr><td>198Ir</td><td>77</td><td>121</td><td>197.97228(21)#</td><td>8(1) s</td><td>β−</td><td>198Pt</td><td></td><td></td><td></td></tr><tr><td>199Ir</td><td>77</td><td>122</td><td>198.97380(4)</td><td>7(5) s</td><td>β−</td><td>199Pt</td><td>3/2+#</td><td></td><td></td></tr><tr><td>199mIr</td><td colspan="3">130(40)# keV</td><td>235(90) ns</td><td>IT</td><td>199Ir</td><td>11/2−#</td><td></td><td></td></tr><tr><td>200Ir</td><td>77</td><td>123</td><td>199.976800(210)#</td><td>43(6) s</td><td>β−</td><td>200Pt</td><td>(2-, 3-)</td><td></td><td></td></tr><tr><td>201Ir</td><td>77</td><td>124</td><td>200.978640(210)#</td><td>21(5) s</td><td>β−</td><td>201Pt</td><td>(3/2+)</td><td></td><td></td></tr><tr><td>202Ir</td><td>77</td><td>125</td><td>201.981990(320)#</td><td>11(3) s</td><td>β−</td><td>202Pt</td><td>(2-)</td><td></td><td></td></tr><tr><td>202mIr</td><td colspan="3">2000(1000)# keV</td><td>3.4(0.6) μs</td><td>IT</td><td>202Ir</td><td></td><td></td><td></td></tr><tr><th colspan="20"><i>This table header & footer:</i> <ul><li>view</li></ul></th></tr></tbody></table> <h2 id="iridium-192">Iridium-192</h2> <p class="note">Main article: <a href="/facts/Iridium-192/F1zVVPRq">Iridium-192</a></p> <p>Iridium-192 (symbol 192Ir) is a radioactive <a href="/facts/Isotope/KD9B1y6o">isotope</a> of <a href="/facts/Iridium/TFQutoj1">iridium</a>, with a <a href="/facts/Half-life/kGVH8BAB">half-life</a> of 73.83 days.<a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> 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 <a href="/facts/Isotopes_of_platinum/G5CS1TkP">192Pt</a>. 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.<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a> Iridium-192 is normally produced by neutron activation of natural-abundance iridium metal.<a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a> </p><p>Iridium-192 is a very strong <a href="/facts/Gamma_ray/5Drf913J">gamma ray</a> emitter, with a gamma dose-constant of approximately 1.54 <a href="/facts/%CE%9CSv/8HLEH1vG">μSv</a>·h−1·<a href="/facts/Becquerel/4C3yrsqp">MBq</a>−1 at 30 cm, and a specific activity of 341 <a href="/facts/Becquerel/4C3yrsqp">TBq</a>·g−1 (9.22 <a href="/facts/Curie_(unit)/LeS60aVv">kCi</a>·g−1).<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a><a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a> There are seven principal energy packets produced during its disintegration process ranging from just over 0.2 to about 0.6 <a href="/facts/Electronvolt/YMT1fqX9">MeV</a>. </p><p>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. </p> <ul><li>Isotope masses from: <ul><li>Audi, Georges; Bersillon, Olivier; Blachot, Jean; <a href="/facts/Aaldert_Wapstra/9Ylvt18s">Wapstra, Aaldert Hendrik</a> (2003), <a href="https://hal.archives-ouvertes.fr/in2p3-00020241/document">"The NUBASE evaluation of nuclear and decay properties"</a>, <i>Nuclear Physics A</i>, 729: 3–128, <a href="/facts/Bibcode_(identifier)/9HtdQSGB">Bibcode</a>:<a href="https://ui.adsabs.harvard.edu/abs/2003NuPhA.729....3A">2003NuPhA.729....3A</a>, <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1016%2Fj.nuclphysa.2003.11.001">10.1016/j.nuclphysa.2003.11.001</a></li></ul></li> <li>Isotopic compositions and standard atomic masses from: <ul><li><a href="/facts/John_Robert_de_Laeter/jYQj55GI">de Laeter, John Robert</a>; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). <a href="https://doi.org/10.1351%2Fpac200375060683">"Atomic weights of the elements. Review 2000 (IUPAC Technical Report)"</a>. <i><a href="/facts/Pure_and_Applied_Chemistry/9QdCDKxf">Pure and Applied Chemistry</a></i>. 75 (6): 683–800. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1351%2Fpac200375060683">10.1351/pac200375060683</a>.</li> <li>Wieser, Michael E. (2006). <a href="https://doi.org/10.1351%2Fpac200678112051">"Atomic weights of the elements 2005 (IUPAC Technical Report)"</a>. <i><a href="/facts/Pure_and_Applied_Chemistry/9QdCDKxf">Pure and Applied Chemistry</a></i>. 78 (11): 2051–2066. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1351%2Fpac200678112051">10.1351/pac200678112051</a>.</li></ul></li> <li><a href="http://old.iupac.org/news/archives/2005/atomic-weights_revised05.html">"News & Notices: Standard Atomic Weights Revised"</a>. <i>International Union of Pure and Applied Chemistry</i>. 19 October 2005.</li> <li>Half-life, spin, and isomer data selected from the following sources. <ul><li>Audi, Georges; Bersillon, Olivier; Blachot, Jean; <a href="/facts/Aaldert_Wapstra/9Ylvt18s">Wapstra, Aaldert Hendrik</a> (2003), <a href="https://hal.archives-ouvertes.fr/in2p3-00020241/document">"The NUBASE evaluation of nuclear and decay properties"</a>, <i>Nuclear Physics A</i>, 729: 3–128, <a href="/facts/Bibcode_(identifier)/9HtdQSGB">Bibcode</a>:<a href="https://ui.adsabs.harvard.edu/abs/2003NuPhA.729....3A">2003NuPhA.729....3A</a>, <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1016%2Fj.nuclphysa.2003.11.001">10.1016/j.nuclphysa.2003.11.001</a></li> <li><a href="/facts/National_Nuclear_Data_Center/SgVzvxLk">National Nuclear Data Center</a>. <a href="http://www.nndc.bnl.gov/nudat2/">"NuDat 2.x database"</a>. <a href="/facts/Brookhaven_National_Laboratory/L2JrG0K1">Brookhaven National Laboratory</a>.</li> <li>Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). <i><a href="/facts/CRC_Handbook_of_Chemistry_and_Physics/qjxzC2Cu">CRC Handbook of Chemistry and Physics</a></i> (85th ed.). <a href="/facts/Boca_Raton,_Florida/9gcNen3S">Boca Raton, Florida</a>: <a href="/facts/CRC_Press/duTuH4hz">CRC Press</a>. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-0-8493-0485-9.</li></ul></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="http://toxnet.nlm.nih.gov/cgi-bin/sis/search/r?dbs+hsdb:@term+@na+@rel+iridium,+radioactive">NLM Hazardous Substances Databank – Iridium, Radioactive</a> (referring to iridium-192)</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>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. <a href="/wiki/ArXiv_(identifier)" target="_blank">/wiki/ArXiv_(identifier)</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Half-life, decay mode, nuclear spin, and isotopic composition is sourced in:Audi, G.; Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S. (2017). "The NUBASE2016 evaluation of nuclear properties" (PDF). Chinese Physics C. 41 (3): 030001. Bibcode:2017ChPhC..41c0001A. doi:10.1088/1674-1137/41/3/030001. <a href="https://www-nds.iaea.org/amdc/ame2016/NUBASE2016.pdf" target="_blank">https://www-nds.iaea.org/amdc/ame2016/NUBASE2016.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>mIr – Excited nuclear isomer. <a href="/wiki/Nuclear_isomer" target="_blank">/wiki/Nuclear_isomer</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Wang, M.; Audi, G.; Kondev, F. G.; Huang, W. J.; Naimi, S.; Xu, X. (2017). "The AME2016 atomic mass evaluation (II). Tables, graphs, and references" (PDF). Chinese Physics C. 41 (3): 030003-1 – 030003-442. doi:10.1088/1674-1137/41/3/030003. <a href="http://nuclearmasses.org/resources_folder/Wang_2017_Chinese_Phys_C_41_030003.pdf" target="_blank">http://nuclearmasses.org/resources_folder/Wang_2017_Chinese_Phys_C_41_030003.pdf</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits. <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p># – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS). <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p># – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Modes of decay: EC:Electron captureIT:Isomeric transitionp:Proton emission <a href="/wiki/Electron_capture" target="_blank">/wiki/Electron_capture</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>Bold italics symbol as daughter – Daughter product is nearly stable. <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>Bold symbol as daughter – Daughter product is stable. <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>( ) spin value – Indicates spin with weak assignment arguments. <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p># – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). <a href="#fnref:12" class="footnote-back-ref">↩</a></p></li> <li id="fn:13"><p># – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). <a href="#fnref:13" class="footnote-back-ref">↩</a></p></li> <li id="fn:14"><p>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): 064309. Bibcode:2014PhRvC..89f4309D. doi:10.1103/PhysRevC.89.064309. ISSN 0556-2813. Retrieved 21 June 2023. <a href="https://journals.aps.org/prc/pdf/10.1103/PhysRevC.89.064309" target="_blank">https://journals.aps.org/prc/pdf/10.1103/PhysRevC.89.064309</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></p></li> <li id="fn:15"><p>Hilton, Joshua Ben. "Decays of new nuclides 169Au, 170Hg, 165Pt and the ground state of 165Ir discovered using MARA". University of Liverpool. ProQuest 2448649087. Retrieved 21 June 2023. <a href="https://www.proquest.com/docview/2448649087" target="_blank">https://www.proquest.com/docview/2448649087</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></p></li> <li id="fn:16"><p>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): 064309. Bibcode:2014PhRvC..89f4309D. doi:10.1103/PhysRevC.89.064309. ISSN 0556-2813. Retrieved 21 June 2023. <a href="https://journals.aps.org/prc/pdf/10.1103/PhysRevC.89.064309" target="_blank">https://journals.aps.org/prc/pdf/10.1103/PhysRevC.89.064309</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></p></li> <li id="fn:17"><p>Janiak, Ł.; Gierlik, M.; Kosinski, T.; Matusiak, M.; Madejowski, G.; Wronka, S.; Rzadkiewicz, J. (2024). "Half-life of 190Ir". Physical Review C. 110 (014306). doi:10.1103/PhysRevC.110.014306. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></p></li> <li id="fn:18"><p>Janiak, Ł.; Gierlik, M.; Kosinski, T.; Matusiak, M.; Madejowski, G.; Wronka, S.; Rzadkiewicz, J. (2024). "Half-life of 190Ir". Physical Review C. 110 (014306). doi:10.1103/PhysRevC.110.014306. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></p></li> <li id="fn:19"><p>Janiak, Ł.; Gierlik, M.; Kosinski, T.; Matusiak, M.; Madejowski, G.; Wronka, S.; Rzadkiewicz, J. (2024). "Half-life of 190Ir". Physical Review C. 110 (014306). doi:10.1103/PhysRevC.110.014306. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></p></li> <li id="fn:20"><p>Janiak, Ł.; Gierlik, M.; Kosinski, T.; Matusiak, M.; Madejowski, G.; Wronka, S.; Rzadkiewicz, J. (2024). "Half-life of 190Ir". Physical Review C. 110 (014306). doi:10.1103/PhysRevC.110.014306. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></p></li> <li id="fn:21"><p>Believed to undergo α decay to 187Re <a href="#fnref:21" class="footnote-back-ref">↩</a></p></li> <li id="fn:22"><p>Believed to undergo α decay to 189Re <a href="#fnref:22" class="footnote-back-ref">↩</a></p></li> <li id="fn:23"><p>"Radioisotope Brief: Iridium-192 (Ir-192)". Retrieved 20 March 2012. <a href="https://emergency.cdc.gov/radiation/isotopes/iridium.asp" target="_blank">https://emergency.cdc.gov/radiation/isotopes/iridium.asp</a> <a href="#fnref:23" class="footnote-back-ref">↩</a></p></li> <li id="fn:24"><p>Baggerly, Leo L. (1956). The radioactive decay of Iridium-192 (PDF) (Ph.D. thesis). Pasadena, Calif.: California Institute of Technology. pp. 1, 2, 7. doi:10.7907/26VA-RB25. <a href="https://thesis.library.caltech.edu/750/1/Baggerly_ll_1956.pdf" target="_blank">https://thesis.library.caltech.edu/750/1/Baggerly_ll_1956.pdf</a> <a href="#fnref:24" class="footnote-back-ref">↩</a></p></li> <li id="fn:25"><p>"Isotope Supplier: Stable Isotopes and Radioisotopes from ISOFLEX - Iridium-192". www.isoflex.com. Retrieved 2017-10-11. <a href="https://www.isoflex.com/products/radioisotopes/iridium-isotopes" target="_blank">https://www.isoflex.com/products/radioisotopes/iridium-isotopes</a> <a href="#fnref:25" class="footnote-back-ref">↩</a></p></li> <li id="fn:26"><p>Delacroix, D; Guerre, J P; Leblanc, P; Hickman, C (2002). Radionuclide and Radiation Protection Data Handbook (PDF). Radiation Protection Dosimetry. Vol. 98, no. 1 (2nd ed.). Ashford, Kent: Nuclear Technology Publishing. pp. 9–168. doi:10.1093/OXFORDJOURNALS.RPD.A006705. ISBN 1870965876. PMID 11916063. S2CID 123447679. Archived from the original (PDF) on 2019-08-22. <a href="1870965876" target="_blank">1870965876</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></p></li> <li id="fn:27"><p>Unger, L M; Trubey, D K (May 1982). Specific Gamma-Ray Dose Constants for Nuclides Important to Dosimetry and Radiological Assessment (PDF) (Report). Oak Ridge National Laboratory. Archived from the original (PDF) on 22 March 2018. <a href="https://web.archive.org/web/20180322020815/https://www.orau.org/documents/ivhp/health-physics/ornl-rsic-45.pdf" target="_blank">https://web.archive.org/web/20180322020815/https://www.orau.org/documents/ivhp/health-physics/ornl-rsic-45.pdf</a> <a href="#fnref:27" class="footnote-back-ref">↩</a></p></li> </ol>