銦（原子量：114818）在自然界中由兩種同位素組成，其中比較多的是有放射性，但半衰期長達 441 年的 115In，佔了天然銦的 957，而穩定的 113In 只佔了 43。在所有有穩定同位素的元素中，只有碲和錸同樣有丰度比穩定同位素還高的放射性同位素。 除了 115In 以外，銦最長壽的放射性同位素是 111In，半衰期為 28047 天。銦還有 47 種同核異構體，其中最長壽的是半衰期 4951 天的 114m1In。 可用作的放射性示蹤劑，也用於，檢測是否有隱藏的感染。 圖表 97In styletextalignright 49 styletextalignright 48 9694954 64 5 ms 92 98In styletextalignright 49 styletextalignright 49 9794214 21 45 23 ms 32 3211 ms 98Cd 0 styletextindent1em 98mIn colspan3 styletextindent2em 0 500 keV 17 8 s 12 124 s 99In styletextalignright 49 styletextalignright 50 9893422 43 31 8 s 30 87 s 99Cd 92 styletextindent1em 99mIn colspan3 styletextindent2em 400 150 keV 1 s 12 rowspan2100In rowspan2 styletextalignright 49 rowspan2 styletextalignright 51 rowspan29993111 27 rowspan259 2 s 961 100Cd rowspan267 rowspan2 rowspan2 39 99Ag rowspan2101In rowspan2 styletextalignright 49 rowspan2 styletextalignright 52 rowspan210092634 32 rowspan2151 3 s 100Cd rowspan292 rowspan2 rowspan2 100Ag styletextindent1em 101mIn colspan3 styletextindent2em 550 100 keV 10 s 12 rowspan2102In rowspan2 styletextalignright 49 rowspan2 styletextalignright 53 rowspan210192409 12 rowspan2233 1 s 9999 102Cd rowspan26 rowspan2 rowspan2 00929 101Ag 103In styletextalignright 49 styletextalignright 54 102919914 27 60 1 s 103Cd 92 styletextindent1em 103mIn colspan3 styletextindent2em 6317 1 keV 34 2 s 12 104In styletextalignright 49 styletextalignright 55 10391830 9 180 3 min 104Cd 56 rowspan2 styletextindent1em 104mIn rowspan2 colspan3 styletextindent2em 9348 10 keV rowspan2157 5 s IT 80 104In rowspan23 rowspan2 rowspan2 20 104Cd 105In styletextalignright 49 styletextalignright 56 104914674 19 507 7 min 105Cd 92 styletextindent1em 105mIn colspan3 styletextindent2em 6741 3 keV 48 6 s IT 105In 12 106In styletextalignright 49 styletextalignright 57 105913465 13 62 1 min 106Cd 7 styletextindent1em 106mIn colspan3 styletextindent2em 286 3 keV 52 1 min 106Cd 3 107In styletextalignright 49 styletextalignright 58 106910295 12 324 3 min 107Cd 92 styletextindent1em 107mIn colspan3 styletextindent2em 6785 3 keV 504 6 s IT 107In 12 108In styletextalignright 49 styletextalignright 59 107909698 10 580 12 min 108Cd 7 styletextindent1em 108mIn colspan3 styletextindent2em 2975 5 keV 396 7 min 108Cd 2 109In styletextalignright 49 styletextalignright 60 108907151 6 42 1 h 109Cd 92 styletextindent1em 109m1In colspan3 styletextindent2em 6501 3 keV 134 7 min IT 109In 12 styletextindent1em 109m2In colspan3 styletextindent2em 21018 2 keV 209 6 ms 192 110In styletextalignright 49 styletextalignright 61 109907165 13 49 1 h 110Cd 7 styletextindent1em 110mIn colspan3 styletextindent2em 621 5 keV 691 5 min 110Cd 2 111In 用於核醫學 styletextalignright 49 styletextalignright 62 110905103 5 28047 5 d 111Cd 92 styletextindent1em 111mIn colspan3 styletextindent2em 53695 6 keV 77 2 min IT 111In 12 rowspan2112In rowspan2 styletextalignright 49 rowspan2 styletextalignright 63 rowspan2111905532 6 rowspan21497 10 min 56 112Cd rowspan21 rowspan2 rowspan2 44 112Sn styletextindent1em 112m1In colspan3 styletextindent2em 15659 5 keV 2056 6 min 112Cd 4 styletextindent1em 112m2In colspan3 styletextindent2em 35076 9 keV 690 50 ns 7 styletextindent1em 112m3In colspan3 styletextindent2em 61369 14 keV 281 3 µs 8 113In styletextalignright 49 styletextalignright 64 112904058 3 colspan3 aligncenter 92 00429 5 styletextindent1em 113mIn colspan3 styletextindent2em 391699 3 keV 16579 4 h IT 113In 12 rowspan2114In rowspan2 styletextalignright 49 rowspan2 styletextalignright 65 rowspan2113904914 3 rowspan2719 1 s 995 114Cd rowspan21 rowspan2 rowspan2 05 114Sn rowspan2 styletextindent1em 114m1In rowspan2 colspan3 styletextindent2em 19029 3 keV rowspan24951 1 d IT 9675 114In rowspan25 rowspan2 rowspan2 325 114Cd rowspan2 styletextindent1em 114m2In rowspan2 colspan3 styletextindent2em 50194 3 keV rowspan2431 6 ms IT 9675 114In rowspan28 rowspan2 rowspan2 325 114Cd styletextindent1em 114m3In colspan3 styletextindent2em 64172 3 keV 43 4 µs 7 裂變產物原始放射性核素 styletextalignright 49 styletextalignright 66 114903878 5 441 251014 a 115Sn 92 09571 5 rowspan2 styletextindent1em 115mIn rowspan2 colspan3 styletextindent2em 336244 17 keV rowspan24486 4 h IT 95 115In rowspan212 rowspan2 rowspan2 5 115Sn rowspan2116In rowspan2 styletextalignright 49 rowspan2 styletextalignright 67 rowspan2115905260 5 rowspan21410 3 s 116Sn rowspan21 rowspan2 rowspan2 116Cd styletextindent1em 116m1In colspan3 styletextindent2em 127267 6 keV 5429 17 min 5 styletextindent1em 116m2In colspan3 styletextindent2em 289660 6 keV 218 4 s 8 117In styletextalignright 49 styletextalignright 68 116904514 6 432 3 min 117Sn 92 rowspan2 styletextindent1em 117mIn rowspan2 colspan3 styletextindent2em 315302 12 keV rowspan21162 3 min 5291 117Sn rowspan212 rowspan2 rowspan2 IT 4709 117In 118In styletextalignright 49 styletextalignright 69 117906354 9 50 5 s 118Sn 1 styletextindent1em 118m1In colspan3 styletextindent2em 100 50 keV 4364 7 min 118Sn 5 styletextindent1em 118m2In colspan3 styletextindent2em 240 50 keV 85 3 s 8 119In styletextalignright 49 styletextalignright 70 118905845 8 24 1 min 119Sn 92 rowspan2 styletextindent1em 119m1In rowspan2 colspan3 styletextindent2em 31137 3 keV rowspan2180 3 min 944 119Sn rowspan212 rowspan2 rowspan2 IT 56 119In styletextindent1em 119m2In colspan3 styletextindent2em 65427 7 keV 130 15 ns 1232 120In styletextalignright 49 styletextalignright 71 11990796 4 308 8 s 120Sn 1 styletextindent1em 120m1In colspan3 styletextindent2em 50 60 keV 462 8 s 5 styletextindent1em 120m2In colspan3 styletextindent2em 300 200 keV 473 5 s 120Sn 8 121In styletextalignright 49 styletextalignright 72 120907846 29 231 6 s 121Sn 92 rowspan2 styletextindent1em 121mIn rowspan2 colspan3 styletextindent2em 31298 8 keV rowspan2388 10 min 988 121Sn rowspan212 rowspan2 rowspan2 IT 12 121In 122In styletextalignright 49 styletextalignright 73 12191028 5 15 3 s 122Sn 1 styletextindent1em 122m1In colspan3 styletextindent2em 40 60 keV 103 6 s 5 styletextindent1em 122m2In colspan3 styletextindent2em 290 140 keV 108 4 s 122Sn 8 123In styletextalignright 49 styletextalignright 74 122910438 26 617 5 s 123mSn 92 styletextindent1em 123mIn colspan3 styletextindent2em 32721 4 keV 474 4 s 123mSn 12 124In styletextalignright 49 styletextalignright 75 12391318 5 311 10 s 124Sn 3 rowspan2 styletextindent1em 124mIn rowspan2 colspan3 styletextindent2em 20 70 keV rowspan237 2 s 124Sn rowspan28 rowspan2 rowspan2 IT 124In 125In styletextalignright 49 styletextalignright 76 12491360 3 236 4 s 125mSn 92 styletextindent1em 125mIn colspan3 styletextindent2em 36012 9 keV 122 2 s 125Sn 12 126In styletextalignright 49 styletextalignright 77 12591646 4 153 1 s 126Sn 3 styletextindent1em 126mIn colspan3 styletextindent2em 100 60 keV 164 5 s 126Sn 8 rowspan2127In rowspan2 styletextalignright 49 rowspan2 styletextalignright 78 rowspan212691735 4 rowspan2109 1 s 9997 127mSn rowspan292 rowspan2 rowspan2 03 126Sn rowspan2 styletextindent1em 127mIn rowspan2 colspan3 styletextindent2em 460 70 keV rowspan2367 4 s 9931 127mSn rowspan212 rowspan2 rowspan2 69 126Sn rowspan2128In rowspan2 styletextalignright 49 rowspan2 styletextalignright 79 rowspan212792017 5 rowspan2084 6 s 9996 128Sn rowspan23 rowspan2 rowspan2 038 127Sn styletextindent1em 128m1In colspan3 styletextindent2em 24787 10 keV 10 7 ms 1 styletextindent1em 128m2In colspan3 styletextindent2em 320 60 keV 720 100 ms 128Sn 8 rowspan2129In rowspan2 styletextalignright 49 rowspan2 styletextalignright 80 rowspan212892170 5 rowspan2611 4 ms 9975 129Sn rowspan292 rowspan2 rowspan2 25 128Sn rowspan3 styletextindent1em 129m1In rowspan3 colspan3 styletextindent2em 380 70 keV rowspan3123 3 s 972 129Sn rowspan312 rowspan3 rowspan3 25 128Sn IT 3 129In styletextindent1em 129m2In colspan3 styletextindent2em 16880 5 keV 85 5 µs 172 rowspan2130In rowspan2 styletextalignright 49 rowspan2 styletextalignright 81 rowspan212992497 4 rowspan2029 2 s 9835 130Sn rowspan21 rowspan2 rowspan2 165 129Sn styletextindent1em 130m1In colspan3 styletextindent2em 50 50 keV 538 5 ms 10 styletextindent1em 130m2In colspan3 styletextindent2em 400 60 keV 054 1 s 5 rowspan2131In rowspan2 styletextalignright 49 rowspan2 styletextalignright 82 rowspan213092685 3 rowspan2028 3 s 978 131Sn rowspan292 rowspan2 rowspan2 219 130Sn styletextindent1em 131m1In colspan3 styletextindent2em 363 37 keV 035 5 s 12 styletextindent1em 131m2In colspan3 styletextindent2em 410 7 MeV 320 60 ms 192 to 232 rowspan2132In rowspan2 styletextalignright 49 rowspan2 styletextalignright 83 rowspan213193299 7 rowspan2206 4 ms 948 132Sn rowspan27 rowspan2 rowspan2 52 131Sn rowspan2133In rowspan2 styletextalignright 49 rowspan2 styletextalignright 84 rowspan213293781 32 rowspan2165 3 ms 85 132Sn rowspan292 rowspan2 rowspan2 15 133Sn styletextindent1em 133mIn colspan3 styletextindent2em 330 40 keV 180 ms IT 133In 12 rowspan3134In rowspan3 styletextalignright 49 rowspan3 styletextalignright 85 rowspan313394415 43 rowspan3140 4 ms 79 134Sn rowspan3 rowspan3 rowspan3 17 133Sn 2n 4 132Sn 135In styletextalignright 49 styletextalignright 86 13494933 54 92 10 ms 92 參考文獻 Isotope masses from Ame2003 Atomic Mass Evaluation by G Audi AH Wapstra C Thibault J Blachot and O Bersillon in Nuclear Physics A729 2003 Isotopic compositions and standard atomic masses from Atomic weights of the elements Review 2000 IUPAC Technical Report Pure Appl Chem Vol 75 No 6 pp 683800 2003 and Atomic Weights Revised 2005 Halflife spin and isomer data selected from these sources Editing notes on this articles talk page Audi Bersillon Blachot Wapstra The Nubase2003 evaluation of nuclear and decay properties Nuc Phys A 729 pp 3128 2003 National Nuclear Data Center Brookhaven National Laboratory Information extracted from the NuDat 21 database retrieved Sept 2005 David R Lide ed Norman E Holden in CRC Handbook of Chemistry and Physics 85th Edition online version CRC Press Boca Raton Florida 2005 Section 11 Table of the Isotopes In Category 銦