鈰（原子量：140116 1）的同位素，其中有 1 個同位素是穩定的，另外有 3 個目前歸類為穩定的同位素，理論上都會進行雙 β 衰變（衰變為鋇或釹），但是半衰期都只有下界。 圖表 119Ce styletextalignright 58 styletextalignright 61 11895276 64 200 ms 119La 52 120Ce styletextalignright 58 styletextalignright 62 11994664 75 250 ms 120La 0 121Ce styletextalignright 58 styletextalignright 63 12094342 54 11 1 s 121La 52 rowspan2122Ce rowspan2 styletextalignright 58 rowspan2 styletextalignright 64 rowspan212193791 43 rowspan22 s 122La rowspan20 rowspan2 rowspan2 121Ba rowspan2123Ce rowspan2 styletextalignright 58 rowspan2 styletextalignright 65 rowspan212293540 32 rowspan238 2 s 123La rowspan252 rowspan2 rowspan2 122Ba 124Ce styletextalignright 58 styletextalignright 66 12393041 32 91 12 s 124La 0 rowspan2125Ce rowspan2 styletextalignright 58 rowspan2 styletextalignright 67 rowspan212492844 21 rowspan293 3 s 125La rowspan272 rowspan2 rowspan2 124Ba 126Ce styletextalignright 58 styletextalignright 68 12592397 3 510 3 s 126La 0 127Ce styletextalignright 58 styletextalignright 69 12692273 6 29 2 s 127La 52 128Ce styletextalignright 58 styletextalignright 70 12791891 3 393 2 min 128La 0 129Ce styletextalignright 58 styletextalignright 71 12891810 3 35 3 min 129La 52 130Ce styletextalignright 58 styletextalignright 72 12991474 3 229 5 min 130La 0 styletextindent1em 130mCe colspan3 styletextindent2em 24536 3 keV 100 8 ns 7 131Ce styletextalignright 58 styletextalignright 73 13091442 4 102 3 min 131La 72 styletextindent1em 131mCe colspan3 styletextindent2em 618 1 keV 50 10 min 131La 12 132Ce styletextalignright 58 styletextalignright 74 131911460 22 351 11 h 132La 0 styletextindent1em 132mCe colspan3 styletextindent2em 23408 5 keV 94 3 ms IT 132Ce 8 133Ce styletextalignright 58 styletextalignright 75 132911515 18 97 4 min 133La 12 styletextindent1em 133mCe colspan3 styletextindent2em 371 8 keV 49 4 h 133La 92 134Ce styletextalignright 58 styletextalignright 76 133908925 22 316 4 d 134La 0 135Ce styletextalignright 58 styletextalignright 77 134909151 12 177 3 h 135La 12 styletextindent1em 135mCe colspan3 styletextindent2em 4458 2 keV 20 1 s IT 135Ce 112 136Ce styletextalignright 58 styletextalignright 78 135907172 14 colspan3 aligncenter 觀測上穩定理論上會透過衰變成 136Ba，半衰期超過 381015 年 0 000185 2 000185000186 styletextindent1em 136mCe colspan3 styletextindent2em 30955 4 keV 22 2 µs 10 137Ce styletextalignright 58 styletextalignright 79 136907806 14 90 3 h 137La 32 rowspan2 styletextindent1em 137mCe rowspan2 colspan3 styletextindent2em 25429 5 keV rowspan2344 3 h IT 9922 137Ce rowspan2112 rowspan2 rowspan2 779 137La 138Ce styletextalignright 58 styletextalignright 80 137905991 11 colspan3 aligncenter 觀測上穩定理論上會透過衰變成 138Ba，半衰期超過 1501012 年 0 000251 2 000251000254 styletextindent1em 138mCe colspan3 styletextindent2em 212917 12 keV 865 20 ms IT 138Ce 7 139Ce styletextalignright 58 styletextalignright 81 138906653 8 137641 20 d 139La 32 styletextindent1em 139mCe colspan3 styletextindent2em 75424 8 keV 5654 13 s IT 139Ce 112 140Ce 裂變產物 styletextalignright 58 styletextalignright 82 1399054387 26 colspan3 aligncenter 0 088450 51 088446088449 styletextindent1em 140mCe colspan3 styletextindent2em 210785 3 keV 73 15 µs 6 141Ce styletextalignright 58 styletextalignright 83 1409082763 26 32508 13 d 141Pr 72 142Ce styletextalignright 58 styletextalignright 84 141909244 3 colspan3 aligncenter 觀測上穩定理論上會透過衰變成 142Nd，半衰期超過 501015 年 0 011114 51 011114011114 143Ce styletextalignright 58 styletextalignright 85 142912386 3 33039 6 h 143Pr 32 144Ce styletextalignright 58 styletextalignright 86 143913647 4 28491 5 d 144mPr 0 145Ce styletextalignright 58 styletextalignright 87 14491723 4 301 6 min 145Pr 32 146Ce styletextalignright 58 styletextalignright 88 14591876 7 1352 13 min 146Pr 0 147Ce styletextalignright 58 styletextalignright 89 14692267 3 564 10 s 147Pr 52 148Ce styletextalignright 58 styletextalignright 90 14792443 3 56 1 s 148Pr 0 149Ce styletextalignright 58 styletextalignright 91 1489284 1 53 2 s 149Pr 32 150Ce styletextalignright 58 styletextalignright 92 14993041 5 40 6 s 150Pr 0 151Ce styletextalignright 58 styletextalignright 93 15093398 11 102 6 s 151Pr 32 152Ce styletextalignright 58 styletextalignright 94 15193654 21 14 2 s 152Pr 0 153Ce styletextalignright 58 styletextalignright 95 15294058 43 500 ms 300 ns 153Pr 32 154Ce styletextalignright 58 styletextalignright 96 15394342 54 300 ms 300 ns 154Pr 0 155Ce styletextalignright 58 styletextalignright 97 15494804 64 200 ms 300 ns 155Pr 52 156Ce styletextalignright 58 styletextalignright 98 15595126 64 150 ms 156Pr 0 157Ce styletextalignright 58 styletextalignright 99 15695634 75 50 ms 157Pr 72 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 Ce Category 鈰