锎是人造元素，没有稳定同位素。它有20种同位素，原子量介于237至256之间，其中半衰期898年的251Cf最稳定。
圖表
|-
| rowspan=2|237Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 139
| rowspan=2|237.06220(10)
| rowspan=2|0.8(2) s
| (70%)
| 233Cm
| rowspan=2|5/2+#
|-
| (30%)
| (various)
|-
| rowspan=2|238Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 140
| rowspan=2|238.06149(32)#
| rowspan=2|21.1(13) ms
| (97.5%)
| (various)
| rowspan=2|0+
|-
| (2.5%)
| 234Cm
|-
| rowspan=2|239Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 141
| rowspan=2|239.06248(13)#
| rowspan=2|28(2) s
|
| 235Cm
| rowspan=2|5/2+#
|-
|
| 239Bk
|-
| rowspan=2|240Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 142
| rowspan=2|240.062253(19)
| rowspan=2|40.3(9) s
| (98.5%)
| 236Cm
| rowspan=2|0+
|-
| SF (1.5%)
| (various)
|-
| rowspan=2|241Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 143
| rowspan=2|241.06369(18)#
| rowspan=2|2.35(18) min
|
| 241Bk
| rowspan=2|7/2−#
|-
|
| 237Cm
|-
| rowspan=3|242Cf
| rowspan=3 style="text-align:right" | 98
| rowspan=3 style="text-align:right" | 144
| rowspan=3|242.063755(14)
| rowspan=3|3.49(15) min
| (61%)
| 238Cm
| rowspan=3|0+
|-
| (39%)
| 242Bk
|-
| SF (243Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 145
| rowspan=2|243.06548(19)#
| rowspan=2|10.8(3) min
| (86%)
| 243Bk
| rowspan=2|(1/2+)
|-
| (14%)
| 239Cm
|-
| Cf
| colspan=3 style="text-indent:2em" | ~315 keV
|
| α
| Cm
| (7/2+)
|-
| rowspan=2|244Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 146
| rowspan=2|244.0659994(28)
| rowspan=2|19.5(5) min
| (75%)
| 240Cm
| rowspan=2|0+
|-
| (25%)
| 244Bk
|-
| rowspan=2|245Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 147
| rowspan=2|245.0680468(26)
| rowspan=2|45.0(15) min
| (64.7%)
| 245Bk
| rowspan=2|(5/2+)
|-
| (35.3%)
| 241Cm
|-
| style="text-indent:1em" | Cf
| colspan="3" style="text-indent:2em" | 57(4)keV
| >100# ns
|
| Cf
| (7/2+)
|-
| rowspan=2|246Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 148
| rowspan=2|246.0688037(16)
| rowspan=2|35.7(5) h
|
| 242Cm
| rowspan=2|0+
|-
| SF (2.4×10−4%)
| (various)
|-
| rowspan=2|247Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 149
| rowspan=2|247.070971(15)
| rowspan=2|3.11(3) h
| (99.965%)
| 247Bk
| rowspan=2|(7/2+)#
|-
| (0.035%)
| 243Cm
|-
| rowspan=2|248Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 150
| rowspan=2|248.072183(5)
| rowspan=2|333.5(28) d
|
| 244Cm
| rowspan=2|0+
|-
| SF (.0029%)
| (various)
|-
| rowspan=2|249Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 151
| rowspan=2|249.0748504(13)
| rowspan=2|351(2) y
|
| 245Cm
| rowspan=2|9/2−
|-
| SF (5×10−7%)
| (various)
|-
| style="text-indent:1em" | 249mCf
| colspan="3" style="text-indent:2em" | 144.98(5) keV
| 45(5) µs
|
| 249Cf
| 5/2+
|-
| rowspan=2|250Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 152
| rowspan=2|250.0764045(17)
| rowspan=2|13.08(9) y
| (99.923%)
| 246Cm
| rowspan=2|0+
|-
| SF (.077%)
| (various)
|-
| 251Cf
| style="text-align:right" | 98
| style="text-align:right" | 153
| 251.079587(4)
| 898(44) y
|
| 247Cm
| 1/2+
|-
| style="text-indent:1em" | Cf
| colspan="3" style="text-indent:2em" | 370.47(3) keV
|
| IT
| Cf
| 11/2−
|-
| rowspan=2|252Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 154
| rowspan=2|252.0816265(25)
| rowspan=2|2.645(8) y
| (96.8972%)
| 248Cm
| rowspan=2|0+
|-
| SF (3.1028%)
| (various)
|-
| rowspan=2|253Cf
| rowspan=2 style="text-align:right" | 98
| rowspan=2 style="text-align:right" | 155
| rowspan=2|253.085134(5)
| rowspan=2|17.81(8) d
| (99.69%)
| 253Es
| rowspan=2|(7/2+)
|-
| (.31%)
| 249Cm
|-
| rowspan="2" |254Cf
| rowspan="2" style="text-align:right" | 98
| rowspan="2" style="text-align:right" | 156
| rowspan="2" |254.087324(12)
| rowspan="2" |60.5(2) d
| SF (99.69%)
| (various)
| rowspan="2" |0+
|-
| (.31%)
| 250Cm
|-
| 255Cf
| style="text-align:right" | 98
| style="text-align:right" | 157
| 255.09105(22)#
| 85(18) min
|
| 255Es
| (7/2+)
|-
| 256Cf
| style="text-align:right" | 98
| style="text-align:right" | 158
| 256.09344(34)#
| 12.3(12) min
| SF
| (various)
| 0+
|}
参考文獻
קליפורניום#איזוטופים של קליפורניום
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