碲（原子量：12760 3）有 39 種同位素與 17 種同核異構體，原子量介於 104 至 142。其中，有八種同位素（120Te、122Te、123Te、124Te、125Te、126Te、128Te、130Te）存在於自然界。128Te 和 130Te 有放射性，但半衰期都極長，分別為 225 年和 791 年。碲最長壽的人造同位素則是半衰期 1931 天的 121Te，但諸如 121mTe（半衰期 1647 天）的同核異構體有更長的半衰期。 放射性同位素 128Te 和 130Te 是碲最常見的兩種同位素。碲與銦、錸一樣都是放射性同位素的丰度比穩定同位素的丰度大的例子。 有團隊報告稱已發現 123Te 的電子捕獲，但他們之後的測量結果否認了這點。123Te 的半衰期至少為 92 年。 圖表 104Te styletextalignright 52 styletextalignright 52 18 ns α 100Sn 0 105Te styletextalignright 52 styletextalignright 53 10494364 54 620 70 ns α 101Sn 52 106Te styletextalignright 52 styletextalignright 54 10593750 14 70 20 µs 70 2010 µs 102Sn 0 rowspan2107Te rowspan2 styletextalignright 52 rowspan2 styletextalignright 55 rowspan210693501 32 rowspan231 1 ms 70 103Sn rowspan252 rowspan2 rowspan2 30 107Sb rowspan4108Te rowspan4 styletextalignright 52 rowspan4 styletextalignright 56 rowspan410792944 11 rowspan421 1 s 51 108Sb rowspan40 rowspan4 rowspan4 49 104Sn 24 107Sn 065 104In rowspan4109Te rowspan4 styletextalignright 52 rowspan4 styletextalignright 57 rowspan410892742 7 rowspan446 3 s 8699 109Sb rowspan452 rowspan4 rowspan4 94 108Sn α 79 105Sn α 005 105In rowspan2110Te rowspan2 styletextalignright 52 rowspan2 styletextalignright 58 rowspan210992241 6 rowspan2186 8 s 9999 110Sb rowspan20 rowspan2 rowspan2 003 109Sn rowspan2111Te rowspan2 styletextalignright 52 rowspan2 styletextalignright 59 rowspan211092111 8 rowspan2193 4 s 111Sb rowspan252 rowspan2 rowspan2 （不常見） 110Sn 112Te styletextalignright 52 styletextalignright 60 11191701 18 20 2 min 112Sb 0 113Te styletextalignright 52 styletextalignright 61 11291589 3 17 2 min 113Sb 72 114Te styletextalignright 52 styletextalignright 62 11391209 3 152 7 min 114Sb 0 115Te styletextalignright 52 styletextalignright 63 11491190 3 58 2 min 115Sb 72 rowspan2 styletextindent1em 115m1Te rowspan2 colspan3 styletextindent2em 10 7 keV rowspan267 4 min 115Sb rowspan212 rowspan2 rowspan2 IT 115Te styletextindent1em 115m2Te colspan3 styletextindent2em 28005 20 keV 75 2 µs 112 116Te styletextalignright 52 styletextalignright 64 11590846 3 249 4 h 116Sb 0 117Te styletextalignright 52 styletextalignright 65 116908645 14 62 2 min 117Sb 12 styletextindent1em 117mTe colspan3 styletextindent2em 2961 5 keV 103 3 ms IT 117Te 112 118Te styletextalignright 52 styletextalignright 66 117905828 16 600 2 d 118Sb 0 119Te styletextalignright 52 styletextalignright 67 118906404 9 1605 5 h 119Sb 12 rowspan2 styletextindent1em 119mTe rowspan2 colspan3 styletextindent2em 26096 5 keV rowspan2470 4 d 9999 119Sb rowspan2112 rowspan2 rowspan2 IT 008 119Te 120Te styletextalignright 52 styletextalignright 68 11990402 1 colspan3 aligncenter 觀測上穩定 Believed to undergo decay to 120Sn with a halflife over 221016 years 0 9 1104 121Te styletextalignright 52 styletextalignright 69 120904936 28 1916 5 d 121Sb 12 rowspan2 styletextindent1em 121mTe rowspan2 colspan3 styletextindent2em 293991 22 keV rowspan2154 7 d IT 886 121Te rowspan2112 rowspan2 rowspan2 114 121Sb 122Te styletextalignright 52 styletextalignright 70 1219030439 16 colspan3 aligncenter 0 00255 12 123Te styletextalignright 52 styletextalignright 71 1229042700 16 colspan3 aligncenter 觀測上穩定 Believed to undergo decay to 123Sb with a halflife over 921016 years 12 00089 3 styletextindent1em 123mTe colspan3 styletextindent2em 24747 4 keV 1192 1 d IT 123Te 112 124Te styletextalignright 52 styletextalignright 72 1239028179 16 colspan3 aligncenter 0 00474 14 125TeFission product styletextalignright 52 styletextalignright 73 1249044307 16 colspan3 aligncenter 12 00707 15 styletextindent1em 125mTe colspan3 styletextindent2em 144772 9 keV 5740 15 d IT 125Te 112 126Te styletextalignright 52 styletextalignright 74 1259033117 16 colspan3 aligncenter 0 01884 25 127Te styletextalignright 52 styletextalignright 75 1269052263 16 935 7 h 127I 32 rowspan2 styletextindent1em 127mTe rowspan2 colspan3 styletextindent2em 8826 8 keV rowspan2109 2 d IT 976 127Te rowspan2112 rowspan2 rowspan2 24 127I 128TePrimordial radionuclide styletextalignright 52 styletextalignright 76 1279044631 19 22 31024 aLongest measured halflife of any nuclide 128Xe 0 03174 8 styletextindent1em 128mTe colspan3 styletextindent2em 27907 4 keV 370 30 ns 10 129Te styletextalignright 52 styletextalignright 77 1289065982 19 696 3 min 129I 32 styletextindent1em 129mTe colspan3 styletextindent2em 10550 5 keV 336 1 d 112 130Te styletextalignright 52 styletextalignright 78 1299062244 21 790 1001018 a 130Xe 0 03408 62 styletextindent1em 130m1Te colspan3 styletextindent2em 214641 4 keV 115 8 ns 7 styletextindent1em 130m2Te colspan3 styletextindent2em 2661 7 keV 190 8 µs 10 styletextindent1em 130m3Te colspan3 styletextindent2em 43754 18 keV 261 33 ns 131Te styletextalignright 52 styletextalignright 79 1309085239 21 250 1 min 131I 32 rowspan2 styletextindent1em 131mTe rowspan2 colspan3 styletextindent2em 182250 20 keV rowspan230 2 h 778 131I rowspan2112 rowspan2 rowspan2 IT 222 131Te 132Te styletextalignright 52 styletextalignright 80 131908553 7 3204 13 d 132I 0 133Te styletextalignright 52 styletextalignright 81 132910955 26 125 3 min 133I 32 rowspan2 styletextindent1em 133mTe rowspan2 colspan3 styletextindent2em 33426 4 keV rowspan2554 4 min 825 133I rowspan2112 rowspan2 rowspan2 IT 175 133Te 134Te styletextalignright 52 styletextalignright 82 133911369 11 418 8 min 134I 0 styletextindent1em 134mTe colspan3 styletextindent2em 169134 16 keV 1641 9 ns 6 135TeVery shortlived fission product responsible for the iodine pit as precursor of 135Xe via 135I styletextalignright 52 styletextalignright 83 13491645 10 190 2 s 135I 72 styletextindent1em 135mTe colspan3 styletextindent2em 155488 17 keV 510 20 ns 192 rowspan2136Te rowspan2 styletextalignright 52 rowspan2 styletextalignright 84 rowspan213592010 5 rowspan21763 8 s 987 136I rowspan20 rowspan2 rowspan2 13 135I rowspan2137Te rowspan2 styletextalignright 52 rowspan2 styletextalignright 85 rowspan213692532 13 rowspan2249 5 s 9701 137I rowspan232 rowspan2 rowspan2 299 136I rowspan2138Te rowspan2 styletextalignright 52 rowspan2 styletextalignright 86 rowspan213792922 22 rowspan214 4 s 937 138I rowspan20 rowspan2 rowspan2 63 137I rowspan2139Te rowspan2 styletextalignright 52 rowspan2 styletextalignright 87 rowspan213893473 43 rowspan2500 ms 300 ns 139I rowspan252 rowspan2 rowspan2 n 138I rowspan2140Te rowspan2 styletextalignright 52 rowspan2 styletextalignright 88 rowspan213993885 32 rowspan2300 ms 300 ns 140I rowspan20 rowspan2 rowspan2 n 139I rowspan2141Te rowspan2 styletextalignright 52 rowspan2 styletextalignright 89 rowspan214094465 43 rowspan2100 ms 300 ns 141I rowspan252 rowspan2 rowspan2 n 140I 142Te styletextalignright 52 styletextalignright 90 14194908 64 50 ms 300 ns 142I 0 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 Te Category 碲