鐦是人造元素，沒有穩定同位素。它有20種同位素，原子量介於237至256之間，其中半衰期898年的251Cf最穩定。[1]
Quick Facts 同位素, 衰變 ...
主要的鉲同位素
| 同位素
|
衰變
|
|
|
豐度
|
半衰期 (t1/2)
|
方式
|
能量
（MeV）
|
產物
|
| 249Cf
|
人造
|
351 年
|
α
|
6.293
|
245Cm
|
| SF
|
–
|
–
|
| 250Cf
|
人造
|
13.08 年
|
α
|
6.129
|
246Cm
|
| SF
|
–
|
–
|
| 251Cf
|
人造
|
898 年
|
α
|
6.177
|
247Cm
|
| 252Cf
|
人造
|
2.645 年
|
α
|
6.217
|
248Cm
|
| SF
|
–
|
–
|
| 253Cf
|
人造
|
17.81 天
|
β−
|
0.291
|
253Es
|
| α
|
6.126
|
249Cm
|
| 254Cf
|
人造
|
60.5 天
|
SF
|
–
|
–
|
| α
|
5.927
|
250Cm
| |
|
|
|
Close
More information 符號, Z ...
| 符號
|
Z
|
N
|
同位素質量（u）
[n 1][n 2]
|
半衰期
[n 2]
|
衰變
方式[2]
|
衰變
產物
|
原子核
自旋[n 1]
|
| 激發能量[n 2]
|
| 237Cf
|
98
|
139
|
237.06207(54)#
|
2.1(3) s
|
SF
|
(various)
|
5/2+#
|
| β+
|
237Bk
|
| α
|
233Cm
|
| 238Cf
|
98
|
140
|
238.06141(43)#
|
21.1(13) ms
|
SF
|
(various)
|
0+
|
| β+ （不常見）
|
238Bk
|
| α （不常見）
|
234Cm
|
| 239Cf
|
98
|
141
|
239.06242(23)#
|
60(30) s
[39(+37−12) s]
|
α
|
235Cm
|
5/2+#
|
| β+ （不常見）
|
239Bk
|
| 240Cf
|
98
|
142
|
240.06230(22)#
|
1.06(15) min
|
α (98%)
|
236Cm
|
0+
|
| SF (2%)
|
(various)
|
| β+ （不常見）
|
240Bk
|
| 241Cf
|
98
|
143
|
241.06373(27)#
|
3.78(70) min
|
β+ (75%)
|
241Bk
|
7/2−#
|
| α (25%)
|
237Cm
|
| 242Cf
|
98
|
144
|
242.06370(4)
|
3.49(15) min
|
α (80%)
|
238Cm
|
0+
|
| β+ (20%)
|
242Bk
|
| SF (.014%)
|
(various)
|
| 243Cf
|
98
|
145
|
243.06543(15)#
|
10.7(5) min
|
β+ (86%)
|
243Bk
|
(1/2+)
|
| α (14%)
|
239Cm
|
| 244Cf
|
98
|
146
|
244.066001(3)
|
19.4(6) min
|
α (99%)
|
240Cm
|
0+
|
| ε (1%)
|
244Bk
|
| 245Cf
|
98
|
147
|
245.068049(3)
|
45.0(15) min
|
β+ (64%)
|
245Bk
|
(5/2+)
|
| α (36%)
|
241Cm
|
| 246Cf
|
98
|
148
|
246.0688053(22)
|
35.7(5) h
|
α
|
242Cm
|
0+
|
| ε (5×10−4%)
|
246Bk
|
| SF (2×10−4%)
|
(various)
|
| 247Cf
|
98
|
149
|
247.071001(9)
|
3.11(3) h
|
ε (99.96%)
|
247Bk
|
(7/2+)#
|
| α (.04%)
|
243Cm
|
| 248Cf
|
98
|
150
|
248.072185(6)
|
333.5(28) d
|
α (99.99%)
|
244Cm
|
0+
|
| SF (.0029%)
|
(various)
|
| 249Cf
|
98
|
151
|
249.0748535(24)
|
351(2) y
|
α
|
245Cm
|
9/2−
|
| SF (5×10−7%)
|
(various)
|
| 249mCf
|
144.98(5) keV
|
45(5) µs
|
|
|
5/2+
|
| 250Cf
|
98
|
152
|
250.0764061(22)
|
13.08(9) y
|
α (99.92%)
|
246Cm
|
0+
|
| SF (.077%)
|
(various)
|
| 251Cf[n 3]
|
98
|
153
|
251.079587(5)
|
900(40) y
|
α
|
247Cm
|
1/2+
|
| 252Cf[n 4]
|
98
|
154
|
252.081626(5)
|
2.645(8) y
|
α (96.9%)
|
248Cm
|
0+
|
| SF (3.09%)[n 5]
|
(various)
|
| 253Cf
|
98
|
155
|
253.085133(7)
|
17.81(8) d
|
β− (99.69%)
|
253Es
|
(7/2+)
|
| α (.31%)
|
249Cm
|
| 254Cf
|
98
|
156
|
254.087323(13)
|
60.5(2) d
|
SF (99.69%)
|
(various)
|
0+
|
| α (.31%)
|
250Cm
|
| 255Cf
|
98
|
157
|
255.09105(22)#
|
85(18) min
|
β− (99.99%)
|
255Es
|
(7/2+)
|
| SF (.001%)
|
(various)
|
| α (10−5%)
|
251Cm
|
| 256Cf
|
98
|
158
|
256.09344(32)#
|
12.3(12) min
|
SF (99%)
|
(various)
|
0+
|
| β− (1%)
|
256Es
|
Close
畫上#號的數據代表沒有經過實驗的証明，僅為理論推測。
High neutron cross-section, tends to absorb neutrons
High neutron emitter, average 3.7 neutrons per fission
- Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
- Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties （頁面存檔備份，存於網際網路檔案館）, Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database （頁面存檔備份，存於網際網路檔案館） (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.
