鉳有 20 種同位素和 6 種同核異構體，全部都有放射性，其中最穩定的是半衰期 1380 年的 247Bk。 圖表 rowspan2236Bk rowspan2 styletextalignright 97 rowspan2 styletextalignright 139 rowspan223605733 43 rowspan2 （96） 236Cm rowspan24 （4） various rowspan3238Bk rowspan3 styletextalignright 97 rowspan3 styletextalignright 141 rowspan323805828 31 rowspan3240 8 min 234Am rowspan3 SF 048 various （不常見） 238Cm rowspan2239Bk rowspan2 styletextalignright 97 rowspan2 styletextalignright 142 rowspan223905828 25 rowspan23 min 235Am rowspan272 239Cm rowspan3240Bk rowspan3 styletextalignright 97 rowspan3 styletextalignright 143 rowspan324005976 16 rowspan348 8 min 90 240Cm rowspan3 10 236Am SF 002 various rowspan2241Bk rowspan2 styletextalignright 97 rowspan2 styletextalignright 144 rowspan224106023 22 rowspan246 4 min 237Am rowspan272 （不常見） 241Cm rowspan2242Bk rowspan2 styletextalignright 97 rowspan2 styletextalignright 145 rowspan224206198 22 rowspan270 13 min 9999 242Cm rowspan22 SF 3104 various styletextindent1em 242mBk colspan3 styletextindent2em 200 200 keV 600 100 ns rowspan2243Bk rowspan2 styletextalignright 97 rowspan2 styletextalignright 146 rowspan2243063008 5 rowspan245 2 h 9985 243Cm rowspan232 15 239Am rowspan2244Bk rowspan2 styletextalignright 97 rowspan2 styletextalignright 147 rowspan2244065181 16 rowspan2435 15 h 9999 244Cm rowspan24 006 240Am rowspan2245Bk rowspan2 styletextalignright 97 rowspan2 styletextalignright 148 rowspan22450663616 25 rowspan2494 3 d 9988 245Cm rowspan232 12 241Am rowspan2246Bk rowspan2 styletextalignright 97 rowspan2 styletextalignright 149 rowspan224606867 6 rowspan2180 2 d 998 246Cm rowspan22 2 242Am rowspan2247Bk rowspan2 styletextalignright 97 rowspan2 styletextalignright 150 rowspan2247070307 6 rowspan2138 25103 y 243Am rowspan232 SF （不常見） various 248Bk styletextalignright 97 styletextalignright 151 24807309 8 300 y 244Am 6 styletextindent1em 248mBk colspan3 styletextindent2em 30 70 keV 237 2 h 1 rowspan3249Bk 最容易製備的同位素 rowspan3 styletextalignright 97 rowspan3 styletextalignright 152 rowspan32490749867 28 rowspan3330 4 d 249Cf rowspan372 00145 245Am SF 47108 various styletextindent1em 249mBk colspan3 styletextindent2em 880 10 keV 300 µs 32 250Bk styletextalignright 97 styletextalignright 153 250078317 4 3212 5 h 250Cf 2 styletextindent1em 250m1Bk colspan3 styletextindent2em 3559 5 keV 29 1 µs 4 styletextindent1em 250m2Bk colspan3 styletextindent2em 841 21 keV 213 8 µs 7 rowspan2251Bk rowspan2 styletextalignright 97 rowspan2 styletextalignright 154 rowspan2251080760 12 rowspan2556 11 min 251Cf rowspan232 105 247Am styletextindent1em 251mBk colspan3 styletextindent2em 355 13 keV 58 4 µs 72 rowspan2252Bk rowspan2 styletextalignright 97 rowspan2 styletextalignright 155 rowspan225208431 22 rowspan218 5 min 252Cf rowspan2 248Am 253Bk styletextalignright 97 styletextalignright 156 25308688 39 10 min 253Cf 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 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 Bk