鑀有從240Es至257Es共18種同位素，其中252Es最穩定，半衰期471.7日（1.291年）。
Quick Facts 同位素, 衰變 ...
主要的鑀同位素
| 同位素
|
衰變
|
|
|
豐度
|
半衰期 (t1/2)
|
方式
|
能量
（MeV）
|
產物
|
| 252Es
|
人造
|
471.7 天
|
α
|
6.760
|
248Bk
|
| ε
|
1.260
|
252Cf
|
| β−
|
0.480
|
252Fm
|
| 253Es
|
人造
|
20.47 天
|
α
|
6.739
|
249Bk
|
| SF
|
–
|
–
|
| 254Es
|
人造
|
275.7 天
|
α
|
6.628
|
250Bk
|
| ε
|
0.654
|
254Cf
|
| SF
|
–
|
–
|
| β−
|
1.090
|
254Fm
|
| 255Es
|
人造
|
39.8 天
|
β−
|
0.288
|
255Fm
|
| α
|
6.436
|
251Bk
|
| SF
|
–
|
–
| |
|
|
|
Close
More information 符號, Z ...
| 符號
|
Z
|
N
|
同位素質量（u）
[n 1][n 2]
|
半衰期
[n 1][n 2]
|
衰變
方式[1]
|
衰變
產物
|
原子核
自旋[n 1]
|
| 激發能量[n 1][n 2]
|
| 240Es
|
99
|
141
|
240.06892(43)#
|
1# s
|
α
|
236Bk
|
|
| β+ （不常見）
|
240Cf
|
| 241Es
|
99
|
142
|
241.06854(24)#
|
10(5) s
[8(+6−5) s]
|
α
|
237Bk
|
(3/2−)
|
| β+ （不常見）
|
241Cf
|
| 242Es
|
99
|
143
|
242.06975(35)#
|
13.5(25) s
|
α (99.94%)
|
238Bk
|
|
| β+, SF (.6%)
|
(various)
|
| β+ （不常見）
|
242Cf
|
| 243Es
|
99
|
144
|
243.06955(25)#
|
21(2) s
|
β+ (70%)
|
243Cf
|
3/2−#
|
| α (30%)
|
239Bk
|
| 244Es
|
99
|
145
|
244.07088(20)#
|
37(4) s
|
β+ (94.69%)
|
244Cf
|
|
| α (5.3%)
|
240Bk
|
| β+, SF (.01%)
|
(various)
|
| 245Es
|
99
|
146
|
245.07132(22)#
|
1.1(1) min
|
β+ (60%)
|
245Cf
|
(3/2−)
|
| α (40%)
|
241Bk
|
| 246Es
|
99
|
147
|
246.07290(24)#
|
7.7(5) min
|
β+ (90.1%)
|
246Cf
|
4−#
|
| α (9.9%)
|
242Bk
|
| β+, SF (.003%)
|
(various)
|
| 247Es
|
99
|
148
|
247.07366(3)#
|
4.55(26) min
|
β+ (93%)
|
247Cf
|
7/2+#
|
| α (7%)
|
243Bk
|
| SF (9×10−5%)
|
(various)
|
| 248Es
|
99
|
149
|
248.07547(6)#
|
27(5) min
|
β+ (99.75%)
|
248Cf
|
2−#,0+#
|
| α (.25%)
|
244Bk
|
| β+, SF (3×10−5%)
|
(various)
|
| 249Es
|
99
|
150
|
249.07641(3)#
|
102.2(6) min
|
β+ (99.43%)
|
249Cf
|
7/2+
|
| α (.57%)
|
245Bk
|
| 250Es
|
99
|
151
|
250.07861(11)#
|
8.6(1) h
|
β+ (97%)
|
250Cf
|
(6+)
|
| α (3%)
|
246Bk
|
| 250mEs
|
200(150)# keV
|
2.22(5) h
|
ε (99%)
|
250Cf
|
1(−)
|
| α (1%)
|
246Bk
|
| 251Es
|
99
|
152
|
251.079992(7)
|
33(1) h
|
ε (99.51%)
|
251Cf
|
(3/2−)
|
| α (.49%)
|
247Bk
|
| 252Es
|
99
|
153
|
252.08298(5)
|
471.7(19) d
|
α (76%)
|
248Bk
|
(5−)
|
| ε (24%)
|
252Cf
|
| β− (.01%)
|
252Fm
|
| 253Es[n 3]
|
99
|
154
|
253.0848247(28)
|
20.47(3) d
|
α
|
249Bk
|
7/2+
|
| SF (8.7×10−6%)
|
(various)
|
| 254Es
|
99
|
155
|
254.088022(5)
|
275.7(5) d
|
α
|
250Bk
|
(7+)
|
| ε (10−4%)
|
254Cf
|
| SF (3×10−6%)
|
(various)
|
| β− (1.74×10−6%)
|
254Fm
|
| 254mEs
|
84.2(25) keV
|
39.3(2) h
|
β− (98%)
|
254Fm
|
2+
|
| IT (3%)
|
254Es
|
| α (.33%)
|
250Bk
|
| ε (.078%)
|
254Cf
|
| SF (.0045%)
|
(various)
|
| 255Es
|
99
|
156
|
255.090273(12)
|
39.8(12) d
|
β− (92%)
|
255Fm
|
(7/2+)
|
| α (8%)
|
251Bk
|
| SF (.0041%)
|
(various)
|
| 256Es
|
99
|
157
|
256.09360(11)#
|
25.4(24) min
|
β−
|
256Fm
|
(1+,0−)
|
| 256mEs
|
0(100)# keV
|
7.6 h
|
β− (99.99%)
|
256Fm
|
(8+)
|
| β−, SF (.002%)
|
(various)
|
| 257Es
|
99
|
158
|
257.09598(44)#
|
7.7(2) d
|
β−
|
257Fm
|
7/2+#
|
| α
|
253Bk
|
| 258Es
|
99
|
159
|
258.09952(32)#
|
3# min
|
|
|
|
Close
畫上#號的數據代表沒有經過實驗的証明，僅為理論推測。
- 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.
