鑀有從 240Es 至 257Es 共 18 種同位素，其中 252Es 最穩定，半衰期。 圖表 rowspan2240Es rowspan2 styletextalignright 99 rowspan2 styletextalignright 141 rowspan224006892 43 rowspan21 s 236Bk rowspan2 （不常見） 240Cf rowspan2241Es rowspan2 styletextalignright 99 rowspan2 styletextalignright 142 rowspan224106854 24 rowspan210 5 s 8 65 s 237Bk rowspan232 （不常見） 241Cf rowspan3242Es rowspan3 styletextalignright 99 rowspan3 styletextalignright 143 rowspan324206975 35 rowspan3135 25 s 9994 238Bk rowspan3 SF 6 various （不常見） 242Cf rowspan2243Es rowspan2 styletextalignright 99 rowspan2 styletextalignright 144 rowspan224306955 25 rowspan221 2 s 70 243Cf rowspan232 30 239Bk rowspan3244Es rowspan3 styletextalignright 99 rowspan3 styletextalignright 145 rowspan324407088 20 rowspan337 4 s 9469 244Cf rowspan3 53 240Bk SF 01 various rowspan2245Es rowspan2 styletextalignright 99 rowspan2 styletextalignright 146 rowspan224507132 22 rowspan211 1 min 60 245Cf rowspan232 40 241Bk rowspan3246Es rowspan3 styletextalignright 99 rowspan3 styletextalignright 147 rowspan324607290 24 rowspan377 5 min 901 246Cf rowspan34 99 242Bk SF 003 various rowspan3247Es rowspan3 styletextalignright 99 rowspan3 styletextalignright 148 rowspan324707366 3 rowspan3455 26 min 93 247Cf rowspan372 7 243Bk SF 9105 various rowspan3248Es rowspan3 styletextalignright 99 rowspan3 styletextalignright 149 rowspan324807547 6 rowspan327 5 min 9975 248Cf rowspan320 25 244Bk SF 3105 various rowspan2249Es rowspan2 styletextalignright 99 rowspan2 styletextalignright 150 rowspan224907641 3 rowspan21022 6 min 9943 249Cf rowspan272 57 245Bk rowspan2250Es rowspan2 styletextalignright 99 rowspan2 styletextalignright 151 rowspan225007861 11 rowspan286 1 h 97 250Cf rowspan26 3 246Bk rowspan2 styletextindent1em 250mEs rowspan2 colspan3 styletextindent2em 200 150 keV rowspan2222 5 h 99 250Cf rowspan21 1 246Bk rowspan2251Es rowspan2 styletextalignright 99 rowspan2 styletextalignright 152 rowspan2251079992 7 rowspan233 1 h 9951 251Cf rowspan232 49 247Bk rowspan3252Es rowspan3 styletextalignright 99 rowspan3 styletextalignright 153 rowspan325208298 5 rowspan34717 19 d 76 248Bk rowspan35 24 252Cf 01 252Fm rowspan2253EsMost common isotope rowspan2 styletextalignright 99 rowspan2 styletextalignright 154 rowspan22530848247 28 rowspan22047 3 d 249Bk rowspan272 SF 87106 various rowspan4254Es rowspan4 styletextalignright 99 rowspan4 styletextalignright 155 rowspan4254088022 5 rowspan42757 5 d 250Bk rowspan47 104 254Cf SF 3106 various 174106 254Fm rowspan5 styletextindent1em 254mEs rowspan5 colspan3 styletextindent2em 842 25 keV rowspan5393 2 h 98 254Fm rowspan52 IT 3 254Es 33 250Bk 078 254Cf SF 0045 various rowspan3255Es rowspan3 styletextalignright 99 rowspan3 styletextalignright 156 rowspan3255090273 12 rowspan3398 12 d 92 255Fm rowspan372 8 251Bk SF 0041 various 256Es styletextalignright 99 styletextalignright 157 25609360 11 254 24 min 256Fm 10 rowspan2 styletextindent1em 256mEs rowspan2 colspan3 styletextindent2em 0 100 keV rowspan276 h 9999 256Fm rowspan28 SF 002 various rowspan2257Es rowspan2 styletextalignright 99 rowspan2 styletextalignright 158 rowspan225709598 44 rowspan277 2 d 257Fm rowspan272 253Bk 258Es styletextalignright 99 styletextalignright 159 25809952 32 3 min 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 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 Es